* [PATCH v4 0/8] per-cgroup tcp buffer pressure settings
@ 2011-10-03 10:18 Glauber Costa
2011-10-03 10:18 ` [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
` (7 more replies)
0 siblings, 8 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:18 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
[[ v3: merge Kirill's suggestions, + a destroy-related bugfix ]]
[[ v4: Fix a bug with non-mounted cgroups + disallow task movement ]]
This patch introduces per-cgroup tcp buffers limitation. This allows
sysadmins to specify a maximum amount of kernel memory that
tcp connections can use at any point in time. TCP is the main interest
in this work, but extending it to other protocols would be easy.
For this to work, I am hooking it into memcg, after the introdution of
an extension for tracking and controlling objects in kernel memory.
Since they are usually not found in page granularity, and are fundamentally
different from userspace memory (not swappable, can't overcommit), they
need their special place inside the Memory Controller.
Right now, the kmem extension is quite basic, and just lays down the
basic infrastucture for the ongoing work.
Although it does not account kernel memory allocated - I preferred to
keep this series simple and leave accounting to the slab allocations when
they arrive.
What it does is to piggyback in the memory control mechanism already present in
/proc/sys/net/ipv4/tcp_mem. There is a soft limit, and a hard limit,
that will suppress allocation when reached. For each non-root cgroup, however,
the file kmem.tcp_maxmem will be used to cap those values.
The usage I have in mind here is containers. Each container will
define its own values for soft and hard limits, but none of them will
be possibly bigger than the value the box' sysadmin specified from
the outside.
To test for any performance impacts of this patch, I used netperf's
TCP_RR benchmark on localhost, so we can have both recv and snd in action.
For this iteration, I am using the 1% confidence interval as suggested by Rick.
Command line used was ./src/netperf -t TCP_RR -H localhost -i 30,3 -I 99,1 and the
results:
Without the patch
=================
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec
16384 87380 1 1 10.00 35356.22
16384 87380
With the patch
==============
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec
16384 87380 1 1 10.00 35399.12
16384 87380
The difference is less than 0.5 %
A simple test with a 1000 level nesting yields more or less the same
difference:
1000 level nesting
==================
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec
16384 87380 1 1 10.00 35304.35
16384 87380
Glauber Costa (8):
Basic kernel memory functionality for the Memory Controller
socket: initial cgroup code.
foundations of per-cgroup memory pressure controlling.
per-cgroup tcp buffers control
per-netns ipv4 sysctl_tcp_mem
tcp buffer limitation: per-cgroup limit
Display current tcp memory allocation in kmem cgroup
Disable task moving when using kernel memory accounting
Documentation/cgroups/memory.txt | 32 +++-
crypto/af_alg.c | 7 +-
include/linux/memcontrol.h | 56 ++++++
include/net/netns/ipv4.h | 1 +
include/net/sock.h | 127 +++++++++++++-
include/net/tcp.h | 29 +++-
include/net/udp.h | 3 +-
include/trace/events/sock.h | 10 +-
init/Kconfig | 11 ++
mm/memcontrol.c | 360 ++++++++++++++++++++++++++++++++++++--
net/core/sock.c | 104 ++++++++---
net/decnet/af_decnet.c | 21 ++-
net/ipv4/proc.c | 7 +-
net/ipv4/sysctl_net_ipv4.c | 71 +++++++-
net/ipv4/tcp.c | 58 ++++---
net/ipv4/tcp_input.c | 12 +-
net/ipv4/tcp_ipv4.c | 24 ++-
net/ipv4/tcp_output.c | 2 +-
net/ipv4/tcp_timer.c | 2 +-
net/ipv4/udp.c | 20 ++-
net/ipv6/tcp_ipv6.c | 20 ++-
net/ipv6/udp.c | 4 +-
net/sctp/socket.c | 35 +++-
23 files changed, 883 insertions(+), 133 deletions(-)
--
1.7.6
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^ permalink raw reply [flat|nested] 34+ messages in thread
* [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller
2011-10-03 10:18 [PATCH v4 0/8] per-cgroup tcp buffer pressure settings Glauber Costa
@ 2011-10-03 10:18 ` Glauber Costa
2011-10-03 10:41 ` Kirill A. Shutemov
2011-10-04 0:38 ` KAMEZAWA Hiroyuki
2011-10-03 10:18 ` [PATCH v4 2/8] socket: initial cgroup code Glauber Costa
` (6 subsequent siblings)
7 siblings, 2 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:18 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin, Glauber Costa
This patch lays down the foundation for the kernel memory component
of the Memory Controller.
As of today, I am only laying down the following files:
* memory.independent_kmem_limit
* memory.kmem.limit_in_bytes (currently ignored)
* memory.kmem.usage_in_bytes (always zero)
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: Paul Menage <paul@paulmenage.org>
CC: Greg Thelen <gthelen@google.com>
---
Documentation/cgroups/memory.txt | 30 +++++++++++-
init/Kconfig | 11 ++++
mm/memcontrol.c | 94 +++++++++++++++++++++++++++++++++++---
3 files changed, 126 insertions(+), 9 deletions(-)
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index 6f3c598..6f1954a 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -44,8 +44,9 @@ Features:
- oom-killer disable knob and oom-notifier
- Root cgroup has no limit controls.
- Kernel memory and Hugepages are not under control yet. We just manage
- pages on LRU. To add more controls, we have to take care of performance.
+ Hugepages is not under control yet. We just manage pages on LRU. To add more
+ controls, we have to take care of performance. Kernel memory support is work
+ in progress, and the current version provides basically functionality.
Brief summary of control files.
@@ -56,8 +57,11 @@ Brief summary of control files.
(See 5.5 for details)
memory.memsw.usage_in_bytes # show current res_counter usage for memory+Swap
(See 5.5 for details)
+ memory.kmem.usage_in_bytes # show current res_counter usage for kmem only.
+ (See 2.7 for details)
memory.limit_in_bytes # set/show limit of memory usage
memory.memsw.limit_in_bytes # set/show limit of memory+Swap usage
+ memory.kmem.limit_in_bytes # if allowed, set/show limit of kernel memory
memory.failcnt # show the number of memory usage hits limits
memory.memsw.failcnt # show the number of memory+Swap hits limits
memory.max_usage_in_bytes # show max memory usage recorded
@@ -72,6 +76,9 @@ Brief summary of control files.
memory.oom_control # set/show oom controls.
memory.numa_stat # show the number of memory usage per numa node
+ memory.independent_kmem_limit # select whether or not kernel memory limits are
+ independent of user limits
+
1. History
The memory controller has a long history. A request for comments for the memory
@@ -255,6 +262,25 @@ When oom event notifier is registered, event will be delivered.
per-zone-per-cgroup LRU (cgroup's private LRU) is just guarded by
zone->lru_lock, it has no lock of its own.
+2.7 Kernel Memory Extension (CONFIG_CGROUP_MEM_RES_CTLR_KMEM)
+
+ With the Kernel memory extension, the Memory Controller is able to limit
+the amount of kernel memory used by the system. Kernel memory is fundamentally
+different than user memory, since it can't be swapped out, which makes it
+possible to DoS the system by consuming too much of this precious resource.
+Kernel memory limits are not imposed for the root cgroup.
+
+Memory limits as specified by the standard Memory Controller may or may not
+take kernel memory into consideration. This is achieved through the file
+memory.independent_kmem_limit. A Value different than 0 will allow for kernel
+memory to be controlled separately.
+
+When kernel memory limits are not independent, the limit values set in
+memory.kmem files are ignored.
+
+Currently no soft limit is implemented for kernel memory. It is future work
+to trigger slab reclaim when those limits are reached.
+
3. User Interface
0. Configuration
diff --git a/init/Kconfig b/init/Kconfig
index d627783..908220e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -689,6 +689,17 @@ config CGROUP_MEM_RES_CTLR_SWAP_ENABLED
For those who want to have the feature enabled by default should
select this option (if, for some reason, they need to disable it
then swapaccount=0 does the trick).
+config CGROUP_MEM_RES_CTLR_KMEM
+ bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
+ depends on CGROUP_MEM_RES_CTLR && EXPERIMENTAL
+ default y
+ help
+ The Kernel Memory extension for Memory Resource Controller can limit
+ the amount of memory used by kernel objects in the system. Those are
+ fundamentally different from the entities handled by the standard
+ Memory Controller, which are page-based, and can be swapped. Users of
+ the kmem extension can use it to guarantee that no group of processes
+ will ever exhaust kernel resources alone.
config CGROUP_PERF
bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ebd1e86..8aaf4ce 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -72,8 +72,6 @@ static int really_do_swap_account __initdata = 0;
#else
#define do_swap_account (0)
#endif
-
-
/*
* Statistics for memory cgroup.
*/
@@ -270,6 +268,10 @@ struct mem_cgroup {
*/
struct res_counter memsw;
/*
+ * the counter to account for kmem usage.
+ */
+ struct res_counter kmem;
+ /*
* Per cgroup active and inactive list, similar to the
* per zone LRU lists.
*/
@@ -321,6 +323,11 @@ struct mem_cgroup {
*/
unsigned long move_charge_at_immigrate;
/*
+ * Should kernel memory limits be stabilished independently
+ * from user memory ?
+ */
+ int kmem_independent_accounting;
+ /*
* percpu counter.
*/
struct mem_cgroup_stat_cpu *stat;
@@ -388,9 +395,14 @@ enum charge_type {
};
/* for encoding cft->private value on file */
-#define _MEM (0)
-#define _MEMSWAP (1)
-#define _OOM_TYPE (2)
+
+enum mem_type {
+ _MEM = 0,
+ _MEMSWAP,
+ _OOM_TYPE,
+ _KMEM,
+};
+
#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
#define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff)
#define MEMFILE_ATTR(val) ((val) & 0xffff)
@@ -3943,10 +3955,15 @@ static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap)
u64 val;
if (!mem_cgroup_is_root(mem)) {
+ val = 0;
+ if (!mem->kmem_independent_accounting)
+ val = res_counter_read_u64(&mem->kmem, RES_USAGE);
if (!swap)
- return res_counter_read_u64(&mem->res, RES_USAGE);
+ val += res_counter_read_u64(&mem->res, RES_USAGE);
else
- return res_counter_read_u64(&mem->memsw, RES_USAGE);
+ val += res_counter_read_u64(&mem->memsw, RES_USAGE);
+
+ return val;
}
val = mem_cgroup_recursive_stat(mem, MEM_CGROUP_STAT_CACHE);
@@ -3979,6 +3996,10 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
else
val = res_counter_read_u64(&mem->memsw, name);
break;
+ case _KMEM:
+ val = res_counter_read_u64(&mem->kmem, name);
+ break;
+
default:
BUG();
break;
@@ -4756,6 +4777,21 @@ static int mem_cgroup_reset_vmscan_stat(struct cgroup *cgrp,
return 0;
}
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+static u64 kmem_limit_independent_read(struct cgroup *cont, struct cftype *cft)
+{
+ return mem_cgroup_from_cont(cont)->kmem_independent_accounting;
+}
+
+static int kmem_limit_independent_write(struct cgroup *cont, struct cftype *cft,
+ u64 val)
+{
+ cgroup_lock();
+ mem_cgroup_from_cont(cont)->kmem_independent_accounting = !!val;
+ cgroup_unlock();
+ return 0;
+}
+#endif
static struct cftype mem_cgroup_files[] = {
{
@@ -4877,6 +4913,44 @@ static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss)
}
#endif
+
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+static struct cftype kmem_cgroup_files[] = {
+ {
+ .name = "independent_kmem_limit",
+ .read_u64 = kmem_limit_independent_read,
+ .write_u64 = kmem_limit_independent_write,
+ },
+ {
+ .name = "kmem.usage_in_bytes",
+ .private = MEMFILE_PRIVATE(_KMEM, RES_USAGE),
+ .read_u64 = mem_cgroup_read,
+ },
+ {
+ .name = "kmem.limit_in_bytes",
+ .private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT),
+ .read_u64 = mem_cgroup_read,
+ },
+};
+
+static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
+{
+ struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
+ int ret = 0;
+
+ if (!mem_cgroup_is_root(mem))
+ ret = cgroup_add_files(cont, ss, kmem_cgroup_files,
+ ARRAY_SIZE(kmem_cgroup_files));
+ return ret;
+};
+
+#else
+static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
+{
+ return 0;
+}
+#endif
+
static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
{
struct mem_cgroup_per_node *pn;
@@ -5075,6 +5149,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
if (parent && parent->use_hierarchy) {
res_counter_init(&mem->res, &parent->res);
res_counter_init(&mem->memsw, &parent->memsw);
+ res_counter_init(&mem->kmem, &parent->kmem);
/*
* We increment refcnt of the parent to ensure that we can
* safely access it on res_counter_charge/uncharge.
@@ -5085,6 +5160,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
} else {
res_counter_init(&mem->res, NULL);
res_counter_init(&mem->memsw, NULL);
+ res_counter_init(&mem->kmem, NULL);
}
mem->last_scanned_child = 0;
mem->last_scanned_node = MAX_NUMNODES;
@@ -5129,6 +5205,10 @@ static int mem_cgroup_populate(struct cgroup_subsys *ss,
if (!ret)
ret = register_memsw_files(cont, ss);
+
+ if (!ret)
+ ret = register_kmem_files(cont, ss);
+
return ret;
}
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 34+ messages in thread
* [PATCH v4 2/8] socket: initial cgroup code.
2011-10-03 10:18 [PATCH v4 0/8] per-cgroup tcp buffer pressure settings Glauber Costa
2011-10-03 10:18 ` [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
@ 2011-10-03 10:18 ` Glauber Costa
2011-10-03 10:47 ` Kirill A. Shutemov
2011-10-04 0:41 ` KAMEZAWA Hiroyuki
2011-10-03 10:18 ` [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
` (5 subsequent siblings)
7 siblings, 2 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:18 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin, Glauber Costa
We aim to control the amount of kernel memory pinned at any
time by tcp sockets. To lay the foundations for this work,
this patch adds a pointer to the kmem_cgroup to the socket
structure.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
include/linux/memcontrol.h | 15 +++++++++++++++
include/net/sock.h | 2 ++
mm/memcontrol.c | 33 +++++++++++++++++++++++++++++++++
net/core/sock.c | 3 +++
4 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 3b535db..2cb9226 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -395,5 +395,20 @@ mem_cgroup_print_bad_page(struct page *page)
}
#endif
+#ifdef CONFIG_INET
+struct sock;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+void sock_update_memcg(struct sock *sk);
+void sock_release_memcg(struct sock *sk);
+
+#else
+static inline void sock_update_memcg(struct sock *sk)
+{
+}
+static inline void sock_release_memcg(struct sock *sk)
+{
+}
+#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
+#endif /* CONFIG_INET */
#endif /* _LINUX_MEMCONTROL_H */
diff --git a/include/net/sock.h b/include/net/sock.h
index 8e4062f..afe1467 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -228,6 +228,7 @@ struct sock_common {
* @sk_security: used by security modules
* @sk_mark: generic packet mark
* @sk_classid: this socket's cgroup classid
+ * @sk_cgrp: this socket's kernel memory (kmem) cgroup
* @sk_write_pending: a write to stream socket waits to start
* @sk_state_change: callback to indicate change in the state of the sock
* @sk_data_ready: callback to indicate there is data to be processed
@@ -339,6 +340,7 @@ struct sock {
#endif
__u32 sk_mark;
u32 sk_classid;
+ struct mem_cgroup *sk_cgrp;
void (*sk_state_change)(struct sock *sk);
void (*sk_data_ready)(struct sock *sk, int bytes);
void (*sk_write_space)(struct sock *sk);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 8aaf4ce..08a520e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -339,6 +339,39 @@ struct mem_cgroup {
spinlock_t pcp_counter_lock;
};
+/* Writing them here to avoid exposing memcg's inner layout */
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+#ifdef CONFIG_INET
+#include <net/sock.h>
+
+void sock_update_memcg(struct sock *sk)
+{
+ /* right now a socket spends its whole life in the same cgroup */
+ BUG_ON(sk->sk_cgrp);
+
+ rcu_read_lock();
+ sk->sk_cgrp = mem_cgroup_from_task(current);
+
+ /*
+ * We don't need to protect against anything task-related, because
+ * we are basically stuck with the sock pointer that won't change,
+ * even if the task that originated the socket changes cgroups.
+ *
+ * What we do have to guarantee, is that the chain leading us to
+ * the top level won't change under our noses. Incrementing the
+ * reference count via cgroup_exclude_rmdir guarantees that.
+ */
+ cgroup_exclude_rmdir(mem_cgroup_css(sk->sk_cgrp));
+ rcu_read_unlock();
+}
+
+void sock_release_memcg(struct sock *sk)
+{
+ cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
+}
+#endif /* CONFIG_INET */
+#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
+
/* Stuffs for move charges at task migration. */
/*
* Types of charges to be moved. "move_charge_at_immitgrate" is treated as a
diff --git a/net/core/sock.c b/net/core/sock.c
index bc745d0..5426ba0 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -125,6 +125,7 @@
#include <net/xfrm.h>
#include <linux/ipsec.h>
#include <net/cls_cgroup.h>
+#include <linux/memcontrol.h>
#include <linux/filter.h>
@@ -1141,6 +1142,7 @@ struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
atomic_set(&sk->sk_wmem_alloc, 1);
sock_update_classid(sk);
+ sock_update_memcg(sk);
}
return sk;
@@ -1172,6 +1174,7 @@ static void __sk_free(struct sock *sk)
put_cred(sk->sk_peer_cred);
put_pid(sk->sk_peer_pid);
put_net(sock_net(sk));
+ sock_release_memcg(sk);
sk_prot_free(sk->sk_prot_creator, sk);
}
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 34+ messages in thread
* [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling.
2011-10-03 10:18 [PATCH v4 0/8] per-cgroup tcp buffer pressure settings Glauber Costa
2011-10-03 10:18 ` [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
2011-10-03 10:18 ` [PATCH v4 2/8] socket: initial cgroup code Glauber Costa
@ 2011-10-03 10:18 ` Glauber Costa
2011-10-03 15:13 ` Andrew Vagin
2011-10-04 0:57 ` KAMEZAWA Hiroyuki
2011-10-03 10:18 ` [PATCH v4 4/8] per-cgroup tcp buffers control Glauber Costa
` (4 subsequent siblings)
7 siblings, 2 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:18 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin, Glauber Costa
This patch converts struct sock fields memory_pressure,
memory_allocated, sockets_allocated, and sysctl_mem (now prot_mem)
to function pointers, receiving a struct mem_cgroup parameter.
enter_memory_pressure is kept the same, since all its callers
have socket a context, and the kmem_cgroup can be derived from
the socket itself.
To keep things working, the patch convert all users of those fields
to use acessor functions.
In my benchmarks I didn't see a significant performance difference
with this patch applied compared to a baseline (around 1 % diff, thus
inside error margin).
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
crypto/af_alg.c | 7 ++-
include/linux/memcontrol.h | 29 +++++++++++-
include/net/sock.h | 112 +++++++++++++++++++++++++++++++++++++++++--
include/net/tcp.h | 11 +++--
include/net/udp.h | 3 +-
include/trace/events/sock.h | 10 ++--
mm/memcontrol.c | 45 +++++++++++++++++-
net/core/sock.c | 62 ++++++++++++++----------
net/decnet/af_decnet.c | 21 +++++++-
net/ipv4/proc.c | 7 ++-
net/ipv4/tcp.c | 27 +++++++++-
net/ipv4/tcp_input.c | 12 ++--
net/ipv4/tcp_ipv4.c | 12 ++--
net/ipv4/tcp_output.c | 2 +-
net/ipv4/tcp_timer.c | 2 +-
net/ipv4/udp.c | 20 ++++++--
net/ipv6/tcp_ipv6.c | 10 ++--
net/ipv6/udp.c | 4 +-
net/sctp/socket.c | 35 ++++++++++---
19 files changed, 345 insertions(+), 86 deletions(-)
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index ac33d5f..9f41324 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -29,10 +29,15 @@ struct alg_type_list {
static atomic_long_t alg_memory_allocated;
+static atomic_long_t *memory_allocated_alg(struct mem_cgroup *memcg)
+{
+ return &alg_memory_allocated;
+}
+
static struct proto alg_proto = {
.name = "ALG",
.owner = THIS_MODULE,
- .memory_allocated = &alg_memory_allocated,
+ .memory_allocated = memory_allocated_alg,
.obj_size = sizeof(struct alg_sock),
};
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 2cb9226..d0b973c 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -380,6 +380,10 @@ static inline
void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
{
}
+static inline struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
+{
+ return NULL;
+}
#endif /* CONFIG_CGROUP_MEM_CONT */
#if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
@@ -397,11 +401,34 @@ mem_cgroup_print_bad_page(struct page *page)
#ifdef CONFIG_INET
struct sock;
+struct proto;
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
void sock_update_memcg(struct sock *sk);
void sock_release_memcg(struct sock *sk);
-
+void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
+ int amt, int *parent_failure);
+void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt);
+void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot);
+void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot);
#else
+/* memcontrol includes sockets.h, that includes memcontrol.h ... */
+static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
+ struct proto *prot, int amt,
+ int *parent_failure)
+{
+}
+static inline void memcg_sock_mem_free(struct mem_cgroup *mem,
+ struct proto *prot, int amt)
+{
+}
+static inline void memcg_sockets_allocated_dec(struct mem_cgroup *mem,
+ struct proto *prot)
+{
+}
+static inline void memcg_sockets_allocated_inc(struct mem_cgroup *mem,
+ struct proto *prot)
+{
+}
static inline void sock_update_memcg(struct sock *sk)
{
}
diff --git a/include/net/sock.h b/include/net/sock.h
index afe1467..c6983cf 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -54,6 +54,7 @@
#include <linux/security.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include <linux/cgroup.h>
#include <linux/filter.h>
#include <linux/rculist_nulls.h>
@@ -168,6 +169,8 @@ struct sock_common {
/* public: */
};
+struct mem_cgroup;
+
/**
* struct sock - network layer representation of sockets
* @__sk_common: shared layout with inet_timewait_sock
@@ -786,18 +789,32 @@ struct proto {
unsigned int inuse_idx;
#endif
+ /*
+ * per-cgroup memory tracking:
+ *
+ * The following functions track memory consumption of network buffers
+ * by cgroup (kmem_cgroup) for the current protocol. As of the rest
+ * of the fields in this structure, not all protocols are required
+ * to implement them. Protocols that don't want to do per-cgroup
+ * memory pressure management, can just assume the root cgroup is used.
+ *
+ */
/* Memory pressure */
void (*enter_memory_pressure)(struct sock *sk);
- atomic_long_t *memory_allocated; /* Current allocated memory. */
- struct percpu_counter *sockets_allocated; /* Current number of sockets. */
+ /* Pointer to the current memory allocation of this cgroup. */
+ atomic_long_t *(*memory_allocated)(struct mem_cgroup *memcg);
+ /* Pointer to the current number of sockets in this cgroup. */
+ struct percpu_counter *(*sockets_allocated)(struct mem_cgroup *memcg);
/*
- * Pressure flag: try to collapse.
+ * Per cgroup pointer to the pressure flag: try to collapse.
* Technical note: it is used by multiple contexts non atomically.
* All the __sk_mem_schedule() is of this nature: accounting
* is strict, actions are advisory and have some latency.
*/
- int *memory_pressure;
- long *sysctl_mem;
+ int *(*memory_pressure)(struct mem_cgroup *memcg);
+ /* Pointer to the per-cgroup version of the the sysctl_mem field */
+ long *(*prot_mem)(struct mem_cgroup *memcg);
+
int *sysctl_wmem;
int *sysctl_rmem;
int max_header;
@@ -856,6 +873,91 @@ static inline void sk_refcnt_debug_release(const struct sock *sk)
#define sk_refcnt_debug_release(sk) do { } while (0)
#endif /* SOCK_REFCNT_DEBUG */
+#include <linux/memcontrol.h>
+static inline int *sk_memory_pressure(struct sock *sk)
+{
+ int *ret = NULL;
+ if (sk->sk_prot->memory_pressure)
+ ret = sk->sk_prot->memory_pressure(sk->sk_cgrp);
+ return ret;
+}
+
+static inline long sk_prot_mem(struct sock *sk, int index)
+{
+ long *prot = sk->sk_prot->prot_mem(sk->sk_cgrp);
+ return prot[index];
+}
+
+static inline long
+sk_memory_allocated(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ return atomic_long_read(prot->memory_allocated(cg));
+}
+
+static inline long
+sk_memory_allocated_add(struct sock *sk, int amt, int *parent_failure)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+ long allocated;
+
+ allocated = atomic_long_add_return(amt, prot->memory_allocated(cg));
+ memcg_sock_mem_alloc(cg, prot, amt, parent_failure);
+ return allocated;
+}
+
+static inline void
+sk_memory_allocated_sub(struct sock *sk, int amt)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ atomic_long_sub(amt, prot->memory_allocated(cg));
+ memcg_sock_mem_free(cg, prot, amt);
+}
+
+static inline void sk_sockets_allocated_dec(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ percpu_counter_dec(prot->sockets_allocated(cg));
+ memcg_sockets_allocated_dec(cg, prot);
+}
+
+static inline void sk_sockets_allocated_inc(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ percpu_counter_inc(prot->sockets_allocated(cg));
+ memcg_sockets_allocated_inc(cg, prot);
+}
+
+static inline int
+sk_sockets_allocated_read_positive(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+ struct mem_cgroup *cg = sk->sk_cgrp;
+
+ return percpu_counter_sum_positive(prot->sockets_allocated(cg));
+}
+
+static inline int
+kcg_sockets_allocated_sum_positive(struct proto *prot, struct mem_cgroup *cg)
+{
+ return percpu_counter_sum_positive(prot->sockets_allocated(cg));
+}
+
+static inline long
+kcg_memory_allocated(struct proto *prot, struct mem_cgroup *cg)
+{
+ return atomic_long_read(prot->memory_allocated(cg));
+}
+
#ifdef CONFIG_PROC_FS
/* Called with local bh disabled */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 149a415..2200694 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -45,6 +45,7 @@
#include <net/dst.h>
#include <linux/seq_file.h>
+#include <linux/memcontrol.h>
extern struct inet_hashinfo tcp_hashinfo;
@@ -253,9 +254,11 @@ extern int sysctl_tcp_cookie_size;
extern int sysctl_tcp_thin_linear_timeouts;
extern int sysctl_tcp_thin_dupack;
-extern atomic_long_t tcp_memory_allocated;
-extern struct percpu_counter tcp_sockets_allocated;
-extern int tcp_memory_pressure;
+struct mem_cgroup;
+extern long *tcp_sysctl_mem(struct mem_cgroup *memcg);
+struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg);
+int *memory_pressure_tcp(struct mem_cgroup *memcg);
+atomic_long_t *memory_allocated_tcp(struct mem_cgroup *memcg);
/*
* The next routines deal with comparing 32 bit unsigned ints
@@ -286,7 +289,7 @@ static inline bool tcp_too_many_orphans(struct sock *sk, int shift)
}
if (sk->sk_wmem_queued > SOCK_MIN_SNDBUF &&
- atomic_long_read(&tcp_memory_allocated) > sysctl_tcp_mem[2])
+ sk_memory_allocated(sk) > sk_prot_mem(sk, 2))
return true;
return false;
}
diff --git a/include/net/udp.h b/include/net/udp.h
index 67ea6fc..b96ed51 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -105,7 +105,8 @@ static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
extern struct proto udp_prot;
-extern atomic_long_t udp_memory_allocated;
+atomic_long_t *memory_allocated_udp(struct mem_cgroup *memcg);
+long *udp_sysctl_mem(struct mem_cgroup *memcg);
/* sysctl variables for udp */
extern long sysctl_udp_mem[3];
diff --git a/include/trace/events/sock.h b/include/trace/events/sock.h
index 779abb9..12a6083 100644
--- a/include/trace/events/sock.h
+++ b/include/trace/events/sock.h
@@ -37,7 +37,7 @@ TRACE_EVENT(sock_exceed_buf_limit,
TP_STRUCT__entry(
__array(char, name, 32)
- __field(long *, sysctl_mem)
+ __field(long *, prot_mem)
__field(long, allocated)
__field(int, sysctl_rmem)
__field(int, rmem_alloc)
@@ -45,7 +45,7 @@ TRACE_EVENT(sock_exceed_buf_limit,
TP_fast_assign(
strncpy(__entry->name, prot->name, 32);
- __entry->sysctl_mem = prot->sysctl_mem;
+ __entry->prot_mem = sk->sk_prot->prot_mem(sk->sk_cgrp);
__entry->allocated = allocated;
__entry->sysctl_rmem = prot->sysctl_rmem[0];
__entry->rmem_alloc = atomic_read(&sk->sk_rmem_alloc);
@@ -54,9 +54,9 @@ TRACE_EVENT(sock_exceed_buf_limit,
TP_printk("proto:%s sysctl_mem=%ld,%ld,%ld allocated=%ld "
"sysctl_rmem=%d rmem_alloc=%d",
__entry->name,
- __entry->sysctl_mem[0],
- __entry->sysctl_mem[1],
- __entry->sysctl_mem[2],
+ __entry->prot_mem[0],
+ __entry->prot_mem[1],
+ __entry->prot_mem[2],
__entry->allocated,
__entry->sysctl_rmem,
__entry->rmem_alloc)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 08a520e..1586332 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -339,6 +339,7 @@ struct mem_cgroup {
spinlock_t pcp_counter_lock;
};
+static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
/* Writing them here to avoid exposing memcg's inner layout */
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
#ifdef CONFIG_INET
@@ -369,6 +370,49 @@ void sock_release_memcg(struct sock *sk)
{
cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
}
+
+void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
+ int amt, int *parent_failure)
+{
+ mem = parent_mem_cgroup(mem);
+ for (; mem != NULL; mem = parent_mem_cgroup(mem)) {
+ long alloc;
+ long *prot_mem = prot->prot_mem(mem);
+ /*
+ * Large nestings are not the common case, and stopping in the
+ * middle would be complicated enough, that we bill it all the
+ * way through the root, and if needed, unbill everything later
+ */
+ alloc = atomic_long_add_return(amt,
+ prot->memory_allocated(mem));
+ *parent_failure |= (alloc > prot_mem[2]);
+ }
+}
+EXPORT_SYMBOL(memcg_sock_mem_alloc);
+
+void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt)
+{
+ mem = parent_mem_cgroup(mem);
+ for (; mem != NULL; mem = parent_mem_cgroup(mem))
+ atomic_long_sub(amt, prot->memory_allocated(mem));
+}
+EXPORT_SYMBOL(memcg_sock_mem_free);
+
+void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot)
+{
+ mem = parent_mem_cgroup(mem);
+ for (; mem; mem = parent_mem_cgroup(mem))
+ percpu_counter_dec(prot->sockets_allocated(mem));
+}
+EXPORT_SYMBOL(memcg_sockets_allocated_dec);
+
+void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot)
+{
+ mem = parent_mem_cgroup(mem);
+ for (; mem; mem = parent_mem_cgroup(mem))
+ percpu_counter_inc(prot->sockets_allocated(mem));
+}
+EXPORT_SYMBOL(memcg_sockets_allocated_inc);
#endif /* CONFIG_INET */
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
@@ -454,7 +498,6 @@ enum mem_type {
static void mem_cgroup_get(struct mem_cgroup *mem);
static void mem_cgroup_put(struct mem_cgroup *mem);
-static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
static void drain_all_stock_async(struct mem_cgroup *mem);
static struct mem_cgroup_per_zone *
diff --git a/net/core/sock.c b/net/core/sock.c
index 5426ba0..6e3ace7 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1293,7 +1293,7 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
newsk->sk_wq = NULL;
if (newsk->sk_prot->sockets_allocated)
- percpu_counter_inc(newsk->sk_prot->sockets_allocated);
+ sk_sockets_allocated_inc(newsk);
if (sock_flag(newsk, SOCK_TIMESTAMP) ||
sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
@@ -1684,30 +1684,33 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
struct proto *prot = sk->sk_prot;
int amt = sk_mem_pages(size);
long allocated;
+ int *memory_pressure;
+ int parent_failure = 0;
sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
- allocated = atomic_long_add_return(amt, prot->memory_allocated);
+
+ memory_pressure = sk_memory_pressure(sk);
+ allocated = sk_memory_allocated_add(sk, amt, &parent_failure);
+
+ /* Over hard limit (we, or our parents) */
+ if (parent_failure || (allocated > sk_prot_mem(sk, 2)))
+ goto suppress_allocation;
/* Under limit. */
- if (allocated <= prot->sysctl_mem[0]) {
- if (prot->memory_pressure && *prot->memory_pressure)
- *prot->memory_pressure = 0;
- return 1;
- }
+ if (allocated <= sk_prot_mem(sk, 0))
+ if (memory_pressure && *memory_pressure)
+ *memory_pressure = 0;
/* Under pressure. */
- if (allocated > prot->sysctl_mem[1])
+ if (allocated > sk_prot_mem(sk, 1))
if (prot->enter_memory_pressure)
prot->enter_memory_pressure(sk);
- /* Over hard limit. */
- if (allocated > prot->sysctl_mem[2])
- goto suppress_allocation;
-
/* guarantee minimum buffer size under pressure */
if (kind == SK_MEM_RECV) {
if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
return 1;
+
} else { /* SK_MEM_SEND */
if (sk->sk_type == SOCK_STREAM) {
if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
@@ -1717,13 +1720,13 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
return 1;
}
- if (prot->memory_pressure) {
+ if (memory_pressure) {
int alloc;
- if (!*prot->memory_pressure)
+ if (!*memory_pressure)
return 1;
- alloc = percpu_counter_read_positive(prot->sockets_allocated);
- if (prot->sysctl_mem[2] > alloc *
+ alloc = sk_sockets_allocated_read_positive(sk);
+ if (sk_prot_mem(sk, 2) > alloc *
sk_mem_pages(sk->sk_wmem_queued +
atomic_read(&sk->sk_rmem_alloc) +
sk->sk_forward_alloc))
@@ -1746,7 +1749,9 @@ suppress_allocation:
/* Alas. Undo changes. */
sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
- atomic_long_sub(amt, prot->memory_allocated);
+
+ sk_memory_allocated_sub(sk, amt);
+
return 0;
}
EXPORT_SYMBOL(__sk_mem_schedule);
@@ -1757,15 +1762,15 @@ EXPORT_SYMBOL(__sk_mem_schedule);
*/
void __sk_mem_reclaim(struct sock *sk)
{
- struct proto *prot = sk->sk_prot;
+ int *memory_pressure = sk_memory_pressure(sk);
- atomic_long_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
- prot->memory_allocated);
+ sk_memory_allocated_sub(sk,
+ sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
- if (prot->memory_pressure && *prot->memory_pressure &&
- (atomic_long_read(prot->memory_allocated) < prot->sysctl_mem[0]))
- *prot->memory_pressure = 0;
+ if (memory_pressure && *memory_pressure &&
+ (sk_memory_allocated(sk) < sk_prot_mem(sk, 0)))
+ *memory_pressure = 0;
}
EXPORT_SYMBOL(__sk_mem_reclaim);
@@ -2484,13 +2489,20 @@ static char proto_method_implemented(const void *method)
static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
{
+ struct mem_cgroup *cg = mem_cgroup_from_task(current);
+ int *memory_pressure = NULL;
+
+ if (proto->memory_pressure)
+ memory_pressure = proto->memory_pressure(cg);
+
seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
"%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
proto->name,
proto->obj_size,
sock_prot_inuse_get(seq_file_net(seq), proto),
- proto->memory_allocated != NULL ? atomic_long_read(proto->memory_allocated) : -1L,
- proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
+ proto->memory_allocated != NULL ?
+ kcg_memory_allocated(proto, cg) : -1L,
+ memory_pressure != NULL ? *memory_pressure ? "yes" : "no" : "NI",
proto->max_header,
proto->slab == NULL ? "no" : "yes",
module_name(proto->owner),
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 19acd00..39f83b4 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -458,13 +458,28 @@ static void dn_enter_memory_pressure(struct sock *sk)
}
}
+static atomic_long_t *memory_allocated_dn(struct mem_cgroup *memcg)
+{
+ return &decnet_memory_allocated;
+}
+
+static int *memory_pressure_dn(struct mem_cgroup *memcg)
+{
+ return &dn_memory_pressure;
+}
+
+static long *dn_sysctl_mem(struct mem_cgroup *memcg)
+{
+ return sysctl_decnet_mem;
+}
+
static struct proto dn_proto = {
.name = "NSP",
.owner = THIS_MODULE,
.enter_memory_pressure = dn_enter_memory_pressure,
- .memory_pressure = &dn_memory_pressure,
- .memory_allocated = &decnet_memory_allocated,
- .sysctl_mem = sysctl_decnet_mem,
+ .memory_pressure = memory_pressure_dn,
+ .memory_allocated = memory_allocated_dn,
+ .prot_mem = dn_sysctl_mem,
.sysctl_wmem = sysctl_decnet_wmem,
.sysctl_rmem = sysctl_decnet_rmem,
.max_header = DN_MAX_NSP_DATA_HEADER + 64,
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index b14ec7d..ba56702 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -52,20 +52,21 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
{
struct net *net = seq->private;
int orphans, sockets;
+ struct mem_cgroup *cg = mem_cgroup_from_task(current);
local_bh_disable();
orphans = percpu_counter_sum_positive(&tcp_orphan_count);
- sockets = percpu_counter_sum_positive(&tcp_sockets_allocated);
+ sockets = kcg_sockets_allocated_sum_positive(&tcp_prot, cg);
local_bh_enable();
socket_seq_show(seq);
seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
sock_prot_inuse_get(net, &tcp_prot), orphans,
tcp_death_row.tw_count, sockets,
- atomic_long_read(&tcp_memory_allocated));
+ kcg_memory_allocated(&tcp_prot, cg));
seq_printf(seq, "UDP: inuse %d mem %ld\n",
sock_prot_inuse_get(net, &udp_prot),
- atomic_long_read(&udp_memory_allocated));
+ kcg_memory_allocated(&udp_prot, cg));
seq_printf(seq, "UDPLITE: inuse %d\n",
sock_prot_inuse_get(net, &udplite_prot));
seq_printf(seq, "RAW: inuse %d\n",
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 46febca..ca82b90 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -291,13 +291,11 @@ EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);
atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
-EXPORT_SYMBOL(tcp_memory_allocated);
/*
* Current number of TCP sockets.
*/
struct percpu_counter tcp_sockets_allocated;
-EXPORT_SYMBOL(tcp_sockets_allocated);
/*
* TCP splice context
@@ -315,7 +313,18 @@ struct tcp_splice_state {
* is strict, actions are advisory and have some latency.
*/
int tcp_memory_pressure __read_mostly;
-EXPORT_SYMBOL(tcp_memory_pressure);
+
+int *memory_pressure_tcp(struct mem_cgroup *memcg)
+{
+ return &tcp_memory_pressure;
+}
+EXPORT_SYMBOL(memory_pressure_tcp);
+
+struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg)
+{
+ return &tcp_sockets_allocated;
+}
+EXPORT_SYMBOL(sockets_allocated_tcp);
void tcp_enter_memory_pressure(struct sock *sk)
{
@@ -326,6 +335,18 @@ void tcp_enter_memory_pressure(struct sock *sk)
}
EXPORT_SYMBOL(tcp_enter_memory_pressure);
+long *tcp_sysctl_mem(struct mem_cgroup *memcg)
+{
+ return sysctl_tcp_mem;
+}
+EXPORT_SYMBOL(tcp_sysctl_mem);
+
+atomic_long_t *memory_allocated_tcp(struct mem_cgroup *memcg)
+{
+ return &tcp_memory_allocated;
+}
+EXPORT_SYMBOL(memory_allocated_tcp);
+
/* Convert seconds to retransmits based on initial and max timeout */
static u8 secs_to_retrans(int seconds, int timeout, int rto_max)
{
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index ea0d218..3f17423 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -316,7 +316,7 @@ static void tcp_grow_window(struct sock *sk, struct sk_buff *skb)
/* Check #1 */
if (tp->rcv_ssthresh < tp->window_clamp &&
(int)tp->rcv_ssthresh < tcp_space(sk) &&
- !tcp_memory_pressure) {
+ !sk_memory_pressure(sk)) {
int incr;
/* Check #2. Increase window, if skb with such overhead
@@ -398,8 +398,8 @@ static void tcp_clamp_window(struct sock *sk)
if (sk->sk_rcvbuf < sysctl_tcp_rmem[2] &&
!(sk->sk_userlocks & SOCK_RCVBUF_LOCK) &&
- !tcp_memory_pressure &&
- atomic_long_read(&tcp_memory_allocated) < sysctl_tcp_mem[0]) {
+ !sk_memory_pressure(sk) &&
+ sk_memory_allocated(sk) < sk_prot_mem(sk, 0)) {
sk->sk_rcvbuf = min(atomic_read(&sk->sk_rmem_alloc),
sysctl_tcp_rmem[2]);
}
@@ -4806,7 +4806,7 @@ static int tcp_prune_queue(struct sock *sk)
if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
tcp_clamp_window(sk);
- else if (tcp_memory_pressure)
+ else if (sk_memory_pressure(sk))
tp->rcv_ssthresh = min(tp->rcv_ssthresh, 4U * tp->advmss);
tcp_collapse_ofo_queue(sk);
@@ -4872,11 +4872,11 @@ static int tcp_should_expand_sndbuf(struct sock *sk)
return 0;
/* If we are under global TCP memory pressure, do not expand. */
- if (tcp_memory_pressure)
+ if (sk_memory_pressure(sk))
return 0;
/* If we are under soft global TCP memory pressure, do not expand. */
- if (atomic_long_read(&tcp_memory_allocated) >= sysctl_tcp_mem[0])
+ if (sk_memory_allocated(sk) >= sk_prot_mem(sk, 0))
return 0;
/* If we filled the congestion window, do not expand. */
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1c12b8e..cbb0d5e 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1901,7 +1901,7 @@ static int tcp_v4_init_sock(struct sock *sk)
sk->sk_rcvbuf = sysctl_tcp_rmem[1];
local_bh_disable();
- percpu_counter_inc(&tcp_sockets_allocated);
+ sk_sockets_allocated_inc(sk);
local_bh_enable();
return 0;
@@ -1957,7 +1957,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
tp->cookie_values = NULL;
}
- percpu_counter_dec(&tcp_sockets_allocated);
+ sk_sockets_allocated_dec(sk);
}
EXPORT_SYMBOL(tcp_v4_destroy_sock);
@@ -2598,11 +2598,11 @@ struct proto tcp_prot = {
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
.enter_memory_pressure = tcp_enter_memory_pressure,
- .sockets_allocated = &tcp_sockets_allocated,
+ .memory_pressure = memory_pressure_tcp,
+ .sockets_allocated = sockets_allocated_tcp,
.orphan_count = &tcp_orphan_count,
- .memory_allocated = &tcp_memory_allocated,
- .memory_pressure = &tcp_memory_pressure,
- .sysctl_mem = sysctl_tcp_mem,
+ .memory_allocated = memory_allocated_tcp,
+ .prot_mem = tcp_sysctl_mem,
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 882e0b0..06aeb31 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1912,7 +1912,7 @@ u32 __tcp_select_window(struct sock *sk)
if (free_space < (full_space >> 1)) {
icsk->icsk_ack.quick = 0;
- if (tcp_memory_pressure)
+ if (sk_memory_pressure(sk))
tp->rcv_ssthresh = min(tp->rcv_ssthresh,
4U * tp->advmss);
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index ecd44b0..2c67617 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -261,7 +261,7 @@ static void tcp_delack_timer(unsigned long data)
}
out:
- if (tcp_memory_pressure)
+ if (sk_memory_pressure(sk))
sk_mem_reclaim(sk);
out_unlock:
bh_unlock_sock(sk);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 1b5a193..f8d72ce 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -120,9 +120,6 @@ EXPORT_SYMBOL(sysctl_udp_rmem_min);
int sysctl_udp_wmem_min __read_mostly;
EXPORT_SYMBOL(sysctl_udp_wmem_min);
-atomic_long_t udp_memory_allocated;
-EXPORT_SYMBOL(udp_memory_allocated);
-
#define MAX_UDP_PORTS 65536
#define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN)
@@ -1918,6 +1915,19 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
}
EXPORT_SYMBOL(udp_poll);
+static atomic_long_t udp_memory_allocated;
+atomic_long_t *memory_allocated_udp(struct mem_cgroup *memcg)
+{
+ return &udp_memory_allocated;
+}
+EXPORT_SYMBOL(memory_allocated_udp);
+
+long *udp_sysctl_mem(struct mem_cgroup *memcg)
+{
+ return sysctl_udp_mem;
+}
+EXPORT_SYMBOL(udp_sysctl_mem);
+
struct proto udp_prot = {
.name = "UDP",
.owner = THIS_MODULE,
@@ -1936,8 +1946,8 @@ struct proto udp_prot = {
.unhash = udp_lib_unhash,
.rehash = udp_v4_rehash,
.get_port = udp_v4_get_port,
- .memory_allocated = &udp_memory_allocated,
- .sysctl_mem = sysctl_udp_mem,
+ .memory_allocated = &memory_allocated_udp,
+ .prot_mem = udp_sysctl_mem,
.sysctl_wmem = &sysctl_udp_wmem_min,
.sysctl_rmem = &sysctl_udp_rmem_min,
.obj_size = sizeof(struct udp_sock),
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index d1fb63f..807797a 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2012,7 +2012,7 @@ static int tcp_v6_init_sock(struct sock *sk)
sk->sk_rcvbuf = sysctl_tcp_rmem[1];
local_bh_disable();
- percpu_counter_inc(&tcp_sockets_allocated);
+ sk_sockets_allocated_inc(sk);
local_bh_enable();
return 0;
@@ -2221,11 +2221,11 @@ struct proto tcpv6_prot = {
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
.enter_memory_pressure = tcp_enter_memory_pressure,
- .sockets_allocated = &tcp_sockets_allocated,
- .memory_allocated = &tcp_memory_allocated,
- .memory_pressure = &tcp_memory_pressure,
+ .sockets_allocated = sockets_allocated_tcp,
+ .memory_allocated = memory_allocated_tcp,
+ .memory_pressure = memory_pressure_tcp,
.orphan_count = &tcp_orphan_count,
- .sysctl_mem = sysctl_tcp_mem,
+ .prot_mem = tcp_sysctl_mem,
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 29213b5..ef4b5b3 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1465,8 +1465,8 @@ struct proto udpv6_prot = {
.unhash = udp_lib_unhash,
.rehash = udp_v6_rehash,
.get_port = udp_v6_get_port,
- .memory_allocated = &udp_memory_allocated,
- .sysctl_mem = sysctl_udp_mem,
+ .memory_allocated = memory_allocated_udp,
+ .prot_mem = udp_sysctl_mem,
.sysctl_wmem = &sysctl_udp_wmem_min,
.sysctl_rmem = &sysctl_udp_rmem_min,
.obj_size = sizeof(struct udp6_sock),
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 836aa63..62eb178 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -119,11 +119,30 @@ static int sctp_memory_pressure;
static atomic_long_t sctp_memory_allocated;
struct percpu_counter sctp_sockets_allocated;
+static long *sctp_sysctl_mem(struct mem_cgroup *memcg)
+{
+ return sysctl_sctp_mem;
+}
+
static void sctp_enter_memory_pressure(struct sock *sk)
{
sctp_memory_pressure = 1;
}
+static int *memory_pressure_sctp(struct mem_cgroup *memcg)
+{
+ return &sctp_memory_pressure;
+}
+
+static atomic_long_t *memory_allocated_sctp(struct mem_cgroup *memcg)
+{
+ return &sctp_memory_allocated;
+}
+
+static struct percpu_counter *sockets_allocated_sctp(struct mem_cgroup *memcg)
+{
+ return &sctp_sockets_allocated;
+}
/* Get the sndbuf space available at the time on the association. */
static inline int sctp_wspace(struct sctp_association *asoc)
@@ -6831,13 +6850,13 @@ struct proto sctp_prot = {
.unhash = sctp_unhash,
.get_port = sctp_get_port,
.obj_size = sizeof(struct sctp_sock),
- .sysctl_mem = sysctl_sctp_mem,
+ .prot_mem = sctp_sysctl_mem,
.sysctl_rmem = sysctl_sctp_rmem,
.sysctl_wmem = sysctl_sctp_wmem,
- .memory_pressure = &sctp_memory_pressure,
+ .memory_pressure = memory_pressure_sctp,
.enter_memory_pressure = sctp_enter_memory_pressure,
- .memory_allocated = &sctp_memory_allocated,
- .sockets_allocated = &sctp_sockets_allocated,
+ .memory_allocated = memory_allocated_sctp,
+ .sockets_allocated = sockets_allocated_sctp,
};
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
@@ -6863,12 +6882,12 @@ struct proto sctpv6_prot = {
.unhash = sctp_unhash,
.get_port = sctp_get_port,
.obj_size = sizeof(struct sctp6_sock),
- .sysctl_mem = sysctl_sctp_mem,
+ .prot_mem = sctp_sysctl_mem,
.sysctl_rmem = sysctl_sctp_rmem,
.sysctl_wmem = sysctl_sctp_wmem,
- .memory_pressure = &sctp_memory_pressure,
+ .memory_pressure = memory_pressure_sctp,
.enter_memory_pressure = sctp_enter_memory_pressure,
- .memory_allocated = &sctp_memory_allocated,
- .sockets_allocated = &sctp_sockets_allocated,
+ .memory_allocated = memory_allocated_sctp,
+ .sockets_allocated = sockets_allocated_sctp,
};
#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 34+ messages in thread
* [PATCH v4 4/8] per-cgroup tcp buffers control
2011-10-03 10:18 [PATCH v4 0/8] per-cgroup tcp buffer pressure settings Glauber Costa
` (2 preceding siblings ...)
2011-10-03 10:18 ` [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
@ 2011-10-03 10:18 ` Glauber Costa
2011-10-04 1:16 ` KAMEZAWA Hiroyuki
2011-10-03 10:18 ` [PATCH v4 5/8] per-netns ipv4 sysctl_tcp_mem Glauber Costa
` (3 subsequent siblings)
7 siblings, 1 reply; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:18 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin, Glauber Costa
With all the infrastructure in place, this patch implements
per-cgroup control for tcp memory pressure handling.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
include/linux/memcontrol.h | 4 ++
include/net/sock.h | 15 +++++++-
include/net/tcp.h | 15 +++++++
mm/memcontrol.c | 92 ++++++++++++++++++++++++++++++++++++++++++++
net/core/sock.c | 39 +++++++++++++++++-
net/ipv4/tcp.c | 44 ++++++++++-----------
net/ipv4/tcp_ipv4.c | 12 +++++-
net/ipv6/tcp_ipv6.c | 10 ++++-
8 files changed, 202 insertions(+), 29 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d0b973c..64ef6de 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -410,6 +410,10 @@ void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt);
void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot);
void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot);
+int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
#else
/* memcontrol includes sockets.h, that includes memcontrol.h ... */
static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
diff --git a/include/net/sock.h b/include/net/sock.h
index c6983cf..0625d79 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -64,6 +64,8 @@
#include <net/dst.h>
#include <net/checksum.h>
+int sockets_populate(struct cgroup *cgrp, struct cgroup_subsys *ss);
+void sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss);
/*
* This structure really needs to be cleaned up.
* Most of it is for TCP, and not used by any of
@@ -814,7 +816,18 @@ struct proto {
int *(*memory_pressure)(struct mem_cgroup *memcg);
/* Pointer to the per-cgroup version of the the sysctl_mem field */
long *(*prot_mem)(struct mem_cgroup *memcg);
-
+ /*
+ * cgroup specific init/deinit functions. Called once for all
+ * protocols that implement it, from cgroups populate function.
+ * This function has to setup any files the protocol want to
+ * appear in the kmem cgroup filesystem.
+ */
+ int (*init_cgroup)(struct proto *prot,
+ struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+ void (*destroy_cgroup)(struct proto *prot,
+ struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
int *sysctl_wmem;
int *sysctl_rmem;
int max_header;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 2200694..3369e1c 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -255,6 +255,20 @@ extern int sysctl_tcp_thin_linear_timeouts;
extern int sysctl_tcp_thin_dupack;
struct mem_cgroup;
+struct tcp_memcontrol {
+ /* per-cgroup tcp memory pressure knobs */
+ atomic_long_t tcp_memory_allocated;
+ struct percpu_counter tcp_sockets_allocated;
+ /* those two are read-mostly, leave them at the end */
+ long tcp_prot_mem[3];
+ int tcp_memory_pressure;
+};
+
+extern long *tcp_sysctl_mem_nocg(struct mem_cgroup *memcg);
+struct percpu_counter *sockets_allocated_tcp_nocg(struct mem_cgroup *memcg);
+int *memory_pressure_tcp_nocg(struct mem_cgroup *memcg);
+atomic_long_t *memory_allocated_tcp_nocg(struct mem_cgroup *memcg);
+
extern long *tcp_sysctl_mem(struct mem_cgroup *memcg);
struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg);
int *memory_pressure_tcp(struct mem_cgroup *memcg);
@@ -1002,6 +1016,7 @@ static inline void tcp_openreq_init(struct request_sock *req,
ireq->loc_port = tcp_hdr(skb)->dest;
}
+extern void tcp_enter_memory_pressure_nocg(struct sock *sk);
extern void tcp_enter_memory_pressure(struct sock *sk);
static inline int keepalive_intvl_when(const struct tcp_sock *tp)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 1586332..4bfed38 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -49,6 +49,9 @@
#include <linux/cpu.h>
#include <linux/oom.h>
#include "internal.h"
+#ifdef CONFIG_INET
+#include <net/tcp.h>
+#endif
#include <asm/uaccess.h>
@@ -337,6 +340,10 @@ struct mem_cgroup {
*/
struct mem_cgroup_stat_cpu nocpu_base;
spinlock_t pcp_counter_lock;
+
+#ifdef CONFIG_INET
+ struct tcp_memcontrol tcp;
+#endif
};
static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
@@ -344,6 +351,7 @@ static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
#ifdef CONFIG_INET
#include <net/sock.h>
+#include <net/ip.h>
void sock_update_memcg(struct sock *sk)
{
@@ -413,6 +421,75 @@ void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot)
percpu_counter_inc(prot->sockets_allocated(mem));
}
EXPORT_SYMBOL(memcg_sockets_allocated_inc);
+
+static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
+/*
+ * Pressure flag: try to collapse.
+ * Technical note: it is used by multiple contexts non atomically.
+ * All the __sk_mem_schedule() is of this nature: accounting
+ * is strict, actions are advisory and have some latency.
+ */
+void tcp_enter_memory_pressure(struct sock *sk)
+{
+ struct mem_cgroup *memcg = sk->sk_cgrp;
+ if (!memcg->tcp.tcp_memory_pressure) {
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES);
+ memcg->tcp.tcp_memory_pressure = 1;
+ }
+}
+
+long *tcp_sysctl_mem(struct mem_cgroup *cg)
+{
+ return cg->tcp.tcp_prot_mem;
+}
+
+atomic_long_t *memory_allocated_tcp(struct mem_cgroup *cg)
+{
+ return &(cg->tcp.tcp_memory_allocated);
+}
+
+int *memory_pressure_tcp(struct mem_cgroup *memcg)
+{
+ return &memcg->tcp.tcp_memory_pressure;
+}
+
+struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg)
+{
+ return &memcg->tcp.tcp_sockets_allocated;
+}
+
+static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
+{
+ cg->tcp.tcp_memory_pressure = 0;
+ atomic_long_set(&cg->tcp.tcp_memory_allocated, 0);
+ percpu_counter_init(&cg->tcp.tcp_sockets_allocated, 0);
+}
+
+int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+ /*
+ * We need to initialize it at populate, not create time.
+ * This is because net sysctl tables are not up until much
+ * later
+ */
+ cg->tcp.tcp_prot_mem[0] = sysctl_tcp_mem[0];
+ cg->tcp.tcp_prot_mem[1] = sysctl_tcp_mem[1];
+ cg->tcp.tcp_prot_mem[2] = sysctl_tcp_mem[2];
+
+ return 0;
+}
+EXPORT_SYMBOL(tcp_init_cgroup);
+
+void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+
+ percpu_counter_destroy(&cg->tcp.tcp_sockets_allocated);
+}
+EXPORT_SYMBOL(tcp_destroy_cgroup);
#endif /* CONFIG_INET */
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
@@ -5017,9 +5094,18 @@ static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
if (!mem_cgroup_is_root(mem))
ret = cgroup_add_files(cont, ss, kmem_cgroup_files,
ARRAY_SIZE(kmem_cgroup_files));
+
+ if (!ret)
+ ret = sockets_populate(cont, ss);
+
return ret;
};
+static void kmem_cgroup_destroy(struct cgroup_subsys *ss,
+ struct cgroup *cont)
+{
+ sockets_destroy(cont, ss);
+}
#else
static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
{
@@ -5242,6 +5328,10 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
mem->last_scanned_node = MAX_NUMNODES;
INIT_LIST_HEAD(&mem->oom_notify);
+#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_INET)
+ tcp_create_cgroup(mem, ss);
+#endif
+
if (parent)
mem->swappiness = mem_cgroup_swappiness(parent);
atomic_set(&mem->refcnt, 1);
@@ -5268,6 +5358,8 @@ static void mem_cgroup_destroy(struct cgroup_subsys *ss,
{
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
+ kmem_cgroup_destroy(ss, cont);
+
mem_cgroup_put(mem);
}
diff --git a/net/core/sock.c b/net/core/sock.c
index 6e3ace7..ef3a9a4 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -135,6 +135,42 @@
#include <net/tcp.h>
#endif
+static DEFINE_RWLOCK(proto_list_lock);
+static LIST_HEAD(proto_list);
+
+int sockets_populate(struct cgroup *cgrp, struct cgroup_subsys *ss)
+{
+ struct proto *proto;
+ int ret = 0;
+
+ read_lock(&proto_list_lock);
+ list_for_each_entry(proto, &proto_list, node) {
+ if (proto->init_cgroup)
+ ret = proto->init_cgroup(proto, cgrp, ss);
+ if (ret)
+ goto out;
+ }
+
+ read_unlock(&proto_list_lock);
+ return ret;
+out:
+ list_for_each_entry_continue_reverse(proto, &proto_list, node)
+ if (proto->destroy_cgroup)
+ proto->destroy_cgroup(proto, cgrp, ss);
+ read_unlock(&proto_list_lock);
+ return ret;
+}
+
+void sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss)
+{
+ struct proto *proto;
+ read_lock(&proto_list_lock);
+ list_for_each_entry_reverse(proto, &proto_list, node)
+ if (proto->destroy_cgroup)
+ proto->destroy_cgroup(proto, cgrp, ss);
+ read_unlock(&proto_list_lock);
+}
+
/*
* Each address family might have different locking rules, so we have
* one slock key per address family:
@@ -2262,9 +2298,6 @@ void sk_common_release(struct sock *sk)
}
EXPORT_SYMBOL(sk_common_release);
-static DEFINE_RWLOCK(proto_list_lock);
-static LIST_HEAD(proto_list);
-
#ifdef CONFIG_PROC_FS
#define PROTO_INUSE_NR 64 /* should be enough for the first time */
struct prot_inuse {
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ca82b90..bbd3989 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -290,13 +290,6 @@ EXPORT_SYMBOL(sysctl_tcp_mem);
EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);
-atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
-
-/*
- * Current number of TCP sockets.
- */
-struct percpu_counter tcp_sockets_allocated;
-
/*
* TCP splice context
*/
@@ -306,46 +299,49 @@ struct tcp_splice_state {
unsigned int flags;
};
-/*
- * Pressure flag: try to collapse.
- * Technical note: it is used by multiple contexts non atomically.
- * All the __sk_mem_schedule() is of this nature: accounting
- * is strict, actions are advisory and have some latency.
- */
+/* Current number of TCP sockets. */
+struct percpu_counter tcp_sockets_allocated;
+atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
int tcp_memory_pressure __read_mostly;
-int *memory_pressure_tcp(struct mem_cgroup *memcg)
+int *memory_pressure_tcp_nocg(struct mem_cgroup *memcg)
{
return &tcp_memory_pressure;
}
-EXPORT_SYMBOL(memory_pressure_tcp);
+EXPORT_SYMBOL(memory_pressure_tcp_nocg);
-struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg)
+struct percpu_counter *sockets_allocated_tcp_nocg(struct mem_cgroup *memcg)
{
return &tcp_sockets_allocated;
}
-EXPORT_SYMBOL(sockets_allocated_tcp);
+EXPORT_SYMBOL(sockets_allocated_tcp_nocg);
-void tcp_enter_memory_pressure(struct sock *sk)
+/*
+ * Pressure flag: try to collapse.
+ * Technical note: it is used by multiple contexts non atomically.
+ * All the __sk_mem_schedule() is of this nature: accounting
+ * is strict, actions are advisory and have some latency.
+ */
+void tcp_enter_memory_pressure_nocg(struct sock *sk)
{
if (!tcp_memory_pressure) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES);
tcp_memory_pressure = 1;
}
}
-EXPORT_SYMBOL(tcp_enter_memory_pressure);
+EXPORT_SYMBOL(tcp_enter_memory_pressure_nocg);
-long *tcp_sysctl_mem(struct mem_cgroup *memcg)
+long *tcp_sysctl_mem_nocg(struct mem_cgroup *memcg)
{
return sysctl_tcp_mem;
}
-EXPORT_SYMBOL(tcp_sysctl_mem);
+EXPORT_SYMBOL(tcp_sysctl_mem_nocg);
-atomic_long_t *memory_allocated_tcp(struct mem_cgroup *memcg)
+atomic_long_t *memory_allocated_tcp_nocg(struct mem_cgroup *memcg)
{
return &tcp_memory_allocated;
}
-EXPORT_SYMBOL(memory_allocated_tcp);
+EXPORT_SYMBOL(memory_allocated_tcp_nocg);
/* Convert seconds to retransmits based on initial and max timeout */
static u8 secs_to_retrans(int seconds, int timeout, int rto_max)
@@ -3247,7 +3243,9 @@ void __init tcp_init(void)
BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > sizeof(skb->cb));
+#ifndef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
percpu_counter_init(&tcp_sockets_allocated, 0);
+#endif
percpu_counter_init(&tcp_orphan_count, 0);
tcp_hashinfo.bind_bucket_cachep =
kmem_cache_create("tcp_bind_bucket",
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index cbb0d5e..689cdc2 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2597,12 +2597,22 @@ struct proto tcp_prot = {
.hash = inet_hash,
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
+ .orphan_count = &tcp_orphan_count,
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ .init_cgroup = tcp_init_cgroup,
+ .destroy_cgroup = tcp_destroy_cgroup,
.enter_memory_pressure = tcp_enter_memory_pressure,
.memory_pressure = memory_pressure_tcp,
.sockets_allocated = sockets_allocated_tcp,
- .orphan_count = &tcp_orphan_count,
.memory_allocated = memory_allocated_tcp,
.prot_mem = tcp_sysctl_mem,
+#else
+ .enter_memory_pressure = tcp_enter_memory_pressure_nocg,
+ .memory_pressure = memory_pressure_tcp_nocg,
+ .sockets_allocated = sockets_allocated_tcp_nocg,
+ .memory_allocated = memory_allocated_tcp_nocg,
+ .prot_mem = tcp_sysctl_mem_nocg,
+#endif
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 807797a..ab976f0 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2220,12 +2220,20 @@ struct proto tcpv6_prot = {
.hash = tcp_v6_hash,
.unhash = inet_unhash,
.get_port = inet_csk_get_port,
+ .orphan_count = &tcp_orphan_count,
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
.enter_memory_pressure = tcp_enter_memory_pressure,
.sockets_allocated = sockets_allocated_tcp,
.memory_allocated = memory_allocated_tcp,
.memory_pressure = memory_pressure_tcp,
- .orphan_count = &tcp_orphan_count,
.prot_mem = tcp_sysctl_mem,
+#else
+ .enter_memory_pressure = tcp_enter_memory_pressure_nocg,
+ .sockets_allocated = sockets_allocated_tcp_nocg,
+ .memory_allocated = memory_allocated_tcp_nocg,
+ .memory_pressure = memory_pressure_tcp_nocg,
+ .prot_mem = tcp_sysctl_mem_nocg,
+#endif
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 34+ messages in thread
* [PATCH v4 5/8] per-netns ipv4 sysctl_tcp_mem
2011-10-03 10:18 [PATCH v4 0/8] per-cgroup tcp buffer pressure settings Glauber Costa
` (3 preceding siblings ...)
2011-10-03 10:18 ` [PATCH v4 4/8] per-cgroup tcp buffers control Glauber Costa
@ 2011-10-03 10:18 ` Glauber Costa
2011-10-04 1:18 ` KAMEZAWA Hiroyuki
2011-10-03 10:18 ` [PATCH v4 6/8] tcp buffer limitation: per-cgroup limit Glauber Costa
` (2 subsequent siblings)
7 siblings, 1 reply; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:18 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin, Glauber Costa
This patch allows each namespace to independently set up
its levels for tcp memory pressure thresholds. This patch
alone does not buy much: we need to make this values
per group of process somehow. This is achieved in the
patches that follows in this patchset.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
include/net/netns/ipv4.h | 1 +
include/net/tcp.h | 1 -
mm/memcontrol.c | 8 ++++--
net/ipv4/sysctl_net_ipv4.c | 51 +++++++++++++++++++++++++++++++++++++------
net/ipv4/tcp.c | 13 ++--------
5 files changed, 53 insertions(+), 21 deletions(-)
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index d786b4f..bbd023a 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -55,6 +55,7 @@ struct netns_ipv4 {
int current_rt_cache_rebuild_count;
unsigned int sysctl_ping_group_range[2];
+ long sysctl_tcp_mem[3];
atomic_t rt_genid;
atomic_t dev_addr_genid;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 3369e1c..a8eb6a0 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -231,7 +231,6 @@ extern int sysctl_tcp_fack;
extern int sysctl_tcp_reordering;
extern int sysctl_tcp_ecn;
extern int sysctl_tcp_dsack;
-extern long sysctl_tcp_mem[3];
extern int sysctl_tcp_wmem[3];
extern int sysctl_tcp_rmem[3];
extern int sysctl_tcp_app_win;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4bfed38..9c0aa22 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -352,6 +352,7 @@ static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
#ifdef CONFIG_INET
#include <net/sock.h>
#include <net/ip.h>
+#include <linux/nsproxy.h>
void sock_update_memcg(struct sock *sk)
{
@@ -469,14 +470,15 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
struct cgroup_subsys *ss)
{
struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+ struct net *net = current->nsproxy->net_ns;
/*
* We need to initialize it at populate, not create time.
* This is because net sysctl tables are not up until much
* later
*/
- cg->tcp.tcp_prot_mem[0] = sysctl_tcp_mem[0];
- cg->tcp.tcp_prot_mem[1] = sysctl_tcp_mem[1];
- cg->tcp.tcp_prot_mem[2] = sysctl_tcp_mem[2];
+ cg->tcp.tcp_prot_mem[0] = net->ipv4.sysctl_tcp_mem[0];
+ cg->tcp.tcp_prot_mem[1] = net->ipv4.sysctl_tcp_mem[1];
+ cg->tcp.tcp_prot_mem[2] = net->ipv4.sysctl_tcp_mem[2];
return 0;
}
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 69fd720..bbd67ab 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/nsproxy.h>
+#include <linux/swap.h>
#include <net/snmp.h>
#include <net/icmp.h>
#include <net/ip.h>
@@ -174,6 +175,36 @@ static int proc_allowed_congestion_control(ctl_table *ctl,
return ret;
}
+static int ipv4_tcp_mem(ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ int ret;
+ unsigned long vec[3];
+ struct net *net = current->nsproxy->net_ns;
+
+ ctl_table tmp = {
+ .data = &vec,
+ .maxlen = sizeof(vec),
+ .mode = ctl->mode,
+ };
+
+ if (!write) {
+ ctl->data = &net->ipv4.sysctl_tcp_mem;
+ return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
+ }
+
+ ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
+ if (ret)
+ return ret;
+
+ net->ipv4.sysctl_tcp_mem[0] = vec[0];
+ net->ipv4.sysctl_tcp_mem[1] = vec[1];
+ net->ipv4.sysctl_tcp_mem[2] = vec[2];
+
+ return 0;
+}
+
static struct ctl_table ipv4_table[] = {
{
.procname = "tcp_timestamps",
@@ -433,13 +464,6 @@ static struct ctl_table ipv4_table[] = {
.proc_handler = proc_dointvec
},
{
- .procname = "tcp_mem",
- .data = &sysctl_tcp_mem,
- .maxlen = sizeof(sysctl_tcp_mem),
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax
- },
- {
.procname = "tcp_wmem",
.data = &sysctl_tcp_wmem,
.maxlen = sizeof(sysctl_tcp_wmem),
@@ -721,6 +745,12 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.proc_handler = ipv4_ping_group_range,
},
+ {
+ .procname = "tcp_mem",
+ .maxlen = sizeof(init_net.ipv4.sysctl_tcp_mem),
+ .mode = 0644,
+ .proc_handler = ipv4_tcp_mem,
+ },
{ }
};
@@ -734,6 +764,7 @@ EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
static __net_init int ipv4_sysctl_init_net(struct net *net)
{
struct ctl_table *table;
+ unsigned long limit;
table = ipv4_net_table;
if (!net_eq(net, &init_net)) {
@@ -769,6 +800,12 @@ static __net_init int ipv4_sysctl_init_net(struct net *net)
net->ipv4.sysctl_rt_cache_rebuild_count = 4;
+ limit = nr_free_buffer_pages() / 8;
+ limit = max(limit, 128UL);
+ net->ipv4.sysctl_tcp_mem[0] = limit / 4 * 3;
+ net->ipv4.sysctl_tcp_mem[1] = limit;
+ net->ipv4.sysctl_tcp_mem[2] = net->ipv4.sysctl_tcp_mem[0] * 2;
+
net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
net_ipv4_ctl_path, table);
if (net->ipv4.ipv4_hdr == NULL)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index bbd3989..cd386df 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -282,11 +282,9 @@ int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT;
struct percpu_counter tcp_orphan_count;
EXPORT_SYMBOL_GPL(tcp_orphan_count);
-long sysctl_tcp_mem[3] __read_mostly;
int sysctl_tcp_wmem[3] __read_mostly;
int sysctl_tcp_rmem[3] __read_mostly;
-EXPORT_SYMBOL(sysctl_tcp_mem);
EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);
@@ -333,7 +331,7 @@ EXPORT_SYMBOL(tcp_enter_memory_pressure_nocg);
long *tcp_sysctl_mem_nocg(struct mem_cgroup *memcg)
{
- return sysctl_tcp_mem;
+ return init_net.ipv4.sysctl_tcp_mem;
}
EXPORT_SYMBOL(tcp_sysctl_mem_nocg);
@@ -3296,14 +3294,9 @@ void __init tcp_init(void)
sysctl_tcp_max_orphans = cnt / 2;
sysctl_max_syn_backlog = max(128, cnt / 256);
- limit = nr_free_buffer_pages() / 8;
- limit = max(limit, 128UL);
- sysctl_tcp_mem[0] = limit / 4 * 3;
- sysctl_tcp_mem[1] = limit;
- sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2;
-
/* Set per-socket limits to no more than 1/128 the pressure threshold */
- limit = ((unsigned long)sysctl_tcp_mem[1]) << (PAGE_SHIFT - 7);
+ limit = ((unsigned long)init_net.ipv4.sysctl_tcp_mem[1])
+ << (PAGE_SHIFT - 7);
max_share = min(4UL*1024*1024, limit);
sysctl_tcp_wmem[0] = SK_MEM_QUANTUM;
--
1.7.6
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
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^ permalink raw reply related [flat|nested] 34+ messages in thread
* [PATCH v4 6/8] tcp buffer limitation: per-cgroup limit
2011-10-03 10:18 [PATCH v4 0/8] per-cgroup tcp buffer pressure settings Glauber Costa
` (4 preceding siblings ...)
2011-10-03 10:18 ` [PATCH v4 5/8] per-netns ipv4 sysctl_tcp_mem Glauber Costa
@ 2011-10-03 10:18 ` Glauber Costa
2011-10-04 1:21 ` KAMEZAWA Hiroyuki
2011-10-03 10:18 ` [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup Glauber Costa
2011-10-03 10:18 ` [PATCH v4 8/8] Disable task moving when using kernel memory accounting Glauber Costa
7 siblings, 1 reply; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:18 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin, Glauber Costa
This patch uses the "tcp_max_mem" field of the kmem_cgroup to
effectively control the amount of kernel memory pinned by a cgroup.
We have to make sure that none of the memory pressure thresholds
specified in the namespace are bigger than the current cgroup.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
Documentation/cgroups/memory.txt | 1 +
include/linux/memcontrol.h | 10 +++++
include/net/tcp.h | 1 +
mm/memcontrol.c | 76 +++++++++++++++++++++++++++++++++++---
net/ipv4/sysctl_net_ipv4.c | 20 ++++++++++
5 files changed, 102 insertions(+), 6 deletions(-)
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index 6f1954a..1ffde3e 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -78,6 +78,7 @@ Brief summary of control files.
memory.independent_kmem_limit # select whether or not kernel memory limits are
independent of user limits
+ memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
1. History
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 64ef6de..a51408d 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -414,6 +414,9 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
struct cgroup_subsys *ss);
void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
struct cgroup_subsys *ss);
+
+unsigned long tcp_max_memory(struct mem_cgroup *cg);
+void tcp_prot_mem(struct mem_cgroup *cg, long val, int idx);
#else
/* memcontrol includes sockets.h, that includes memcontrol.h ... */
static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
@@ -439,6 +442,13 @@ static inline void sock_update_memcg(struct sock *sk)
static inline void sock_release_memcg(struct sock *sk)
{
}
+static inline unsigned long tcp_max_memory(struct mem_cgroup *cg)
+{
+ return 0;
+}
+static inline void tcp_prot_mem(struct mem_cgroup *cg, long val, int idx)
+{
+}
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
#endif /* CONFIG_INET */
#endif /* _LINUX_MEMCONTROL_H */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index a8eb6a0..2606713 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -256,6 +256,7 @@ extern int sysctl_tcp_thin_dupack;
struct mem_cgroup;
struct tcp_memcontrol {
/* per-cgroup tcp memory pressure knobs */
+ int tcp_max_memory;
atomic_long_t tcp_memory_allocated;
struct percpu_counter tcp_sockets_allocated;
/* those two are read-mostly, leave them at the end */
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9c0aa22..38b66e9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -346,6 +346,11 @@ struct mem_cgroup {
#endif
};
+static inline bool mem_cgroup_is_root(struct mem_cgroup *mem)
+{
+ return (mem == root_mem_cgroup);
+}
+
static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
/* Writing them here to avoid exposing memcg's inner layout */
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
@@ -459,6 +464,46 @@ struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg)
return &memcg->tcp.tcp_sockets_allocated;
}
+static int tcp_write_maxmem(struct cgroup *cgrp, struct cftype *cft, u64 val)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent = parent_mem_cgroup(memcg);
+ struct net *net = current->nsproxy->net_ns;
+ int i;
+
+ if (parent && parent->use_hierarchy)
+ return -EINVAL;
+ /*
+ * We can't allow more memory than our parents. Since this
+ * will be tested for all calls, by induction, there is no need
+ * to test any parent other than our own
+ * */
+ if (parent && (val > parent->tcp.tcp_max_memory))
+ val = parent->tcp.tcp_max_memory;
+
+ memcg->tcp.tcp_max_memory = val;
+
+ for (i = 0; i < 3; i++)
+ memcg->tcp.tcp_prot_mem[i] = min_t(long, val,
+ net->ipv4.sysctl_tcp_mem[i]);
+
+ return 0;
+}
+
+static u64 tcp_read_maxmem(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+ return memcg->tcp.tcp_max_memory;
+}
+
+static struct cftype tcp_files[] = {
+ {
+ .name = "kmem.tcp.max_memory",
+ .write_u64 = tcp_write_maxmem,
+ .read_u64 = tcp_read_maxmem,
+ },
+};
+
static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
{
cg->tcp.tcp_memory_pressure = 0;
@@ -470,6 +515,7 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
struct cgroup_subsys *ss)
{
struct mem_cgroup *cg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent = parent_mem_cgroup(cg);
struct net *net = current->nsproxy->net_ns;
/*
* We need to initialize it at populate, not create time.
@@ -480,6 +526,20 @@ int tcp_init_cgroup(struct proto *prot, struct cgroup *cgrp,
cg->tcp.tcp_prot_mem[1] = net->ipv4.sysctl_tcp_mem[1];
cg->tcp.tcp_prot_mem[2] = net->ipv4.sysctl_tcp_mem[2];
+
+ if (parent && parent->use_hierarchy)
+ cg->tcp.tcp_max_memory = parent->tcp.tcp_max_memory;
+ else {
+ unsigned long limit;
+ limit = nr_free_buffer_pages() / 8;
+ limit = max(limit, 128UL);
+ cg->tcp.tcp_max_memory = limit * 2;
+ }
+
+
+ if (!mem_cgroup_is_root(cg))
+ return cgroup_add_files(cgrp, ss, tcp_files,
+ ARRAY_SIZE(tcp_files));
return 0;
}
EXPORT_SYMBOL(tcp_init_cgroup);
@@ -492,6 +552,16 @@ void tcp_destroy_cgroup(struct proto *prot, struct cgroup *cgrp,
percpu_counter_destroy(&cg->tcp.tcp_sockets_allocated);
}
EXPORT_SYMBOL(tcp_destroy_cgroup);
+
+unsigned long tcp_max_memory(struct mem_cgroup *memcg)
+{
+ return memcg->tcp.tcp_max_memory;
+}
+
+void tcp_prot_mem(struct mem_cgroup *memcg, long val, int idx)
+{
+ memcg->tcp.tcp_prot_mem[idx] = val;
+}
#endif /* CONFIG_INET */
#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
@@ -1070,12 +1140,6 @@ static struct mem_cgroup *mem_cgroup_get_next(struct mem_cgroup *iter,
#define for_each_mem_cgroup_all(iter) \
for_each_mem_cgroup_tree_cond(iter, NULL, true)
-
-static inline bool mem_cgroup_is_root(struct mem_cgroup *mem)
-{
- return (mem == root_mem_cgroup);
-}
-
void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
{
struct mem_cgroup *mem;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index bbd67ab..cdc35f6 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/nsproxy.h>
+#include <linux/memcontrol.h>
#include <linux/swap.h>
#include <net/snmp.h>
#include <net/icmp.h>
@@ -182,6 +183,10 @@ static int ipv4_tcp_mem(ctl_table *ctl, int write,
int ret;
unsigned long vec[3];
struct net *net = current->nsproxy->net_ns;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ int i;
+ struct mem_cgroup *cg;
+#endif
ctl_table tmp = {
.data = &vec,
@@ -198,6 +203,21 @@ static int ipv4_tcp_mem(ctl_table *ctl, int write,
if (ret)
return ret;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ rcu_read_lock();
+ cg = mem_cgroup_from_task(current);
+ for (i = 0; i < 3; i++)
+ if (vec[i] > tcp_max_memory(cg)) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+
+ tcp_prot_mem(cg, vec[0], 0);
+ tcp_prot_mem(cg, vec[1], 1);
+ tcp_prot_mem(cg, vec[2], 2);
+ rcu_read_unlock();
+#endif
+
net->ipv4.sysctl_tcp_mem[0] = vec[0];
net->ipv4.sysctl_tcp_mem[1] = vec[1];
net->ipv4.sysctl_tcp_mem[2] = vec[2];
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 34+ messages in thread
* [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup
2011-10-03 10:18 [PATCH v4 0/8] per-cgroup tcp buffer pressure settings Glauber Costa
` (5 preceding siblings ...)
2011-10-03 10:18 ` [PATCH v4 6/8] tcp buffer limitation: per-cgroup limit Glauber Costa
@ 2011-10-03 10:18 ` Glauber Costa
2011-10-03 12:14 ` Kirill A. Shutemov
2011-10-03 10:18 ` [PATCH v4 8/8] Disable task moving when using kernel memory accounting Glauber Costa
7 siblings, 1 reply; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:18 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin, Glauber Costa
This patch introduces kmem.tcp_current_memory file, living in the
kmem_cgroup filesystem. It is a simple read-only file that displays the
amount of kernel memory currently consumed by the cgroup.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
Documentation/cgroups/memory.txt | 1 +
mm/memcontrol.c | 11 +++++++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index 1ffde3e..f5a539d 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -79,6 +79,7 @@ Brief summary of control files.
memory.independent_kmem_limit # select whether or not kernel memory limits are
independent of user limits
memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
+ memory.kmem.tcp.current_memory # show current tcp buf memory allocation
1. History
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 38b66e9..3b38d0a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -496,12 +496,23 @@ static u64 tcp_read_maxmem(struct cgroup *cgrp, struct cftype *cft)
return memcg->tcp.tcp_max_memory;
}
+static u64 tcp_read_curmem(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+
+ return atomic_long_read(&memcg->tcp.tcp_memory_allocated);
+}
+
static struct cftype tcp_files[] = {
{
.name = "kmem.tcp.max_memory",
.write_u64 = tcp_write_maxmem,
.read_u64 = tcp_read_maxmem,
},
+ {
+ .name = "kmem.tcp.current_memory",
+ .read_u64 = tcp_read_curmem,
+ },
};
static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 34+ messages in thread
* [PATCH v4 8/8] Disable task moving when using kernel memory accounting
2011-10-03 10:18 [PATCH v4 0/8] per-cgroup tcp buffer pressure settings Glauber Costa
` (6 preceding siblings ...)
2011-10-03 10:18 ` [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup Glauber Costa
@ 2011-10-03 10:18 ` Glauber Costa
7 siblings, 0 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:18 UTC (permalink / raw)
To: linux-kernel
Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin, Glauber Costa
Since this code is still experimental, we are leaving the exact
details of how to move tasks between cgroups when kernel memory
accounting is used as future work.
For now, we simply disallow movement if there are any pending
accounted memory.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
---
include/net/tcp.h | 1 +
mm/memcontrol.c | 37 ++++++++++++++++++++++---------------
2 files changed, 23 insertions(+), 15 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 2606713..b47a8e9 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -257,6 +257,7 @@ struct mem_cgroup;
struct tcp_memcontrol {
/* per-cgroup tcp memory pressure knobs */
int tcp_max_memory;
+ atomic_t refcnt;
atomic_long_t tcp_memory_allocated;
struct percpu_counter tcp_sockets_allocated;
/* those two are read-mostly, leave them at the end */
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3b38d0a..66740d3 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -366,28 +366,17 @@ void sock_update_memcg(struct sock *sk)
rcu_read_lock();
sk->sk_cgrp = mem_cgroup_from_task(current);
-
- /*
- * We don't need to protect against anything task-related, because
- * we are basically stuck with the sock pointer that won't change,
- * even if the task that originated the socket changes cgroups.
- *
- * What we do have to guarantee, is that the chain leading us to
- * the top level won't change under our noses. Incrementing the
- * reference count via cgroup_exclude_rmdir guarantees that.
- */
- cgroup_exclude_rmdir(mem_cgroup_css(sk->sk_cgrp));
rcu_read_unlock();
}
void sock_release_memcg(struct sock *sk)
{
- cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
}
void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
int amt, int *parent_failure)
{
+ atomic_inc(&mem->tcp.refcnt);
mem = parent_mem_cgroup(mem);
for (; mem != NULL; mem = parent_mem_cgroup(mem)) {
long alloc;
@@ -406,9 +395,12 @@ EXPORT_SYMBOL(memcg_sock_mem_alloc);
void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt)
{
- mem = parent_mem_cgroup(mem);
- for (; mem != NULL; mem = parent_mem_cgroup(mem))
- atomic_long_sub(amt, prot->memory_allocated(mem));
+ struct mem_cgroup *parent;
+ parent = parent_mem_cgroup(mem);
+ for (; parent != NULL; parent = parent_mem_cgroup(parent))
+ atomic_long_sub(amt, prot->memory_allocated(parent));
+
+ atomic_dec(&mem->tcp.refcnt);
}
EXPORT_SYMBOL(memcg_sock_mem_free);
@@ -519,6 +511,7 @@ static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
{
cg->tcp.tcp_memory_pressure = 0;
atomic_long_set(&cg->tcp.tcp_memory_allocated, 0);
+ atomic_set(&cg->tcp.refcnt, 0);
percpu_counter_init(&cg->tcp.tcp_sockets_allocated, 0);
}
@@ -5778,6 +5771,12 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
int ret = 0;
struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup);
+ if (atomic_read(&mem->tcp.refcnt)) {
+ printk(KERN_WARNING "Can't move tasks between cgroups: "
+ "Kernel memory held. task: %s\n", p->comm);
+ return 1;
+ }
+
if (mem->move_charge_at_immigrate) {
struct mm_struct *mm;
struct mem_cgroup *from = mem_cgroup_from_task(p);
@@ -5948,6 +5947,14 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
struct cgroup *cgroup,
struct task_struct *p)
{
+ struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup);
+
+ if (atomic_read(&mem->tcp.refcnt)) {
+ printk(KERN_WARNING "Can't move tasks between cgroups: "
+ "Kernel memory held. task: %s\n", p->comm);
+ return 1;
+ }
+
return 0;
}
static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
--
1.7.6
--
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^ permalink raw reply related [flat|nested] 34+ messages in thread
* Re: [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller
2011-10-03 10:18 ` [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
@ 2011-10-03 10:41 ` Kirill A. Shutemov
2011-10-03 10:41 ` Glauber Costa
2011-10-04 0:38 ` KAMEZAWA Hiroyuki
1 sibling, 1 reply; 34+ messages in thread
From: Kirill A. Shutemov @ 2011-10-03 10:41 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On Mon, Oct 03, 2011 at 02:18:36PM +0400, Glauber Costa wrote:
> This patch lays down the foundation for the kernel memory component
> of the Memory Controller.
>
> As of today, I am only laying down the following files:
>
> * memory.independent_kmem_limit
> * memory.kmem.limit_in_bytes (currently ignored)
> * memory.kmem.usage_in_bytes (always zero)
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: Paul Menage <paul@paulmenage.org>
> CC: Greg Thelen <gthelen@google.com>
Reviewed-by: Kirill A. Shutemov <kirill@shutemov.name>
One comment bellow.
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index ebd1e86..8aaf4ce 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -72,8 +72,6 @@ static int really_do_swap_account __initdata = 0;
> #else
> #define do_swap_account (0)
> #endif
> -
> -
> /*
> * Statistics for memory cgroup.
> */
Please drop this hunk.
--
Kirill A. Shutemov
--
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller
2011-10-03 10:41 ` Kirill A. Shutemov
@ 2011-10-03 10:41 ` Glauber Costa
0 siblings, 0 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:41 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On 10/03/2011 02:41 PM, Kirill A. Shutemov wrote:
> On Mon, Oct 03, 2011 at 02:18:36PM +0400, Glauber Costa wrote:
>> This patch lays down the foundation for the kernel memory component
>> of the Memory Controller.
>>
>> As of today, I am only laying down the following files:
>>
>> * memory.independent_kmem_limit
>> * memory.kmem.limit_in_bytes (currently ignored)
>> * memory.kmem.usage_in_bytes (always zero)
>>
>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>> CC: Paul Menage<paul@paulmenage.org>
>> CC: Greg Thelen<gthelen@google.com>
>
> Reviewed-by: Kirill A. Shutemov<kirill@shutemov.name>
>
> One comment bellow.
>
>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>> index ebd1e86..8aaf4ce 100644
>> --- a/mm/memcontrol.c
>> +++ b/mm/memcontrol.c
>> @@ -72,8 +72,6 @@ static int really_do_swap_account __initdata = 0;
>> #else
>> #define do_swap_account (0)
>> #endif
>> -
>> -
>> /*
>> * Statistics for memory cgroup.
>> */
>
> Please drop this hunk.
>
Just did. Thanks for noticing, I missed this one.
--
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 2/8] socket: initial cgroup code.
2011-10-03 10:18 ` [PATCH v4 2/8] socket: initial cgroup code Glauber Costa
@ 2011-10-03 10:47 ` Kirill A. Shutemov
2011-10-03 10:48 ` Glauber Costa
2011-10-04 0:41 ` KAMEZAWA Hiroyuki
1 sibling, 1 reply; 34+ messages in thread
From: Kirill A. Shutemov @ 2011-10-03 10:47 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On Mon, Oct 03, 2011 at 02:18:37PM +0400, Glauber Costa wrote:
> We aim to control the amount of kernel memory pinned at any
> time by tcp sockets. To lay the foundations for this work,
> this patch adds a pointer to the kmem_cgroup to the socket
> structure.
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.com>
> ---
> include/linux/memcontrol.h | 15 +++++++++++++++
> include/net/sock.h | 2 ++
> mm/memcontrol.c | 33 +++++++++++++++++++++++++++++++++
> net/core/sock.c | 3 +++
> 4 files changed, 53 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 3b535db..2cb9226 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -395,5 +395,20 @@ mem_cgroup_print_bad_page(struct page *page)
> }
> #endif
>
> +#ifdef CONFIG_INET
> +struct sock;
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> +void sock_update_memcg(struct sock *sk);
> +void sock_release_memcg(struct sock *sk);
> +
> +#else
> +static inline void sock_update_memcg(struct sock *sk)
> +{
> +}
> +static inline void sock_release_memcg(struct sock *sk)
> +{
> +}
> +#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
> +#endif /* CONFIG_INET */
> #endif /* _LINUX_MEMCONTROL_H */
>
> diff --git a/include/net/sock.h b/include/net/sock.h
> index 8e4062f..afe1467 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -228,6 +228,7 @@ struct sock_common {
> * @sk_security: used by security modules
> * @sk_mark: generic packet mark
> * @sk_classid: this socket's cgroup classid
> + * @sk_cgrp: this socket's kernel memory (kmem) cgroup
> * @sk_write_pending: a write to stream socket waits to start
> * @sk_state_change: callback to indicate change in the state of the sock
> * @sk_data_ready: callback to indicate there is data to be processed
> @@ -339,6 +340,7 @@ struct sock {
> #endif
> __u32 sk_mark;
> u32 sk_classid;
> + struct mem_cgroup *sk_cgrp;
> void (*sk_state_change)(struct sock *sk);
> void (*sk_data_ready)(struct sock *sk, int bytes);
> void (*sk_write_space)(struct sock *sk);
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 8aaf4ce..08a520e 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -339,6 +339,39 @@ struct mem_cgroup {
> spinlock_t pcp_counter_lock;
> };
>
> +/* Writing them here to avoid exposing memcg's inner layout */
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> +#ifdef CONFIG_INET
> +#include <net/sock.h>
> +
> +void sock_update_memcg(struct sock *sk)
> +{
> + /* right now a socket spends its whole life in the same cgroup */
> + BUG_ON(sk->sk_cgrp);
Do we really want to panic in this case?
What about WARN() + return?
Otherwise: Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
> +
> + rcu_read_lock();
> + sk->sk_cgrp = mem_cgroup_from_task(current);
> +
> + /*
> + * We don't need to protect against anything task-related, because
> + * we are basically stuck with the sock pointer that won't change,
> + * even if the task that originated the socket changes cgroups.
> + *
> + * What we do have to guarantee, is that the chain leading us to
> + * the top level won't change under our noses. Incrementing the
> + * reference count via cgroup_exclude_rmdir guarantees that.
> + */
> + cgroup_exclude_rmdir(mem_cgroup_css(sk->sk_cgrp));
> + rcu_read_unlock();
> +}
--
Kirill A. Shutemov
--
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 2/8] socket: initial cgroup code.
2011-10-03 10:47 ` Kirill A. Shutemov
@ 2011-10-03 10:48 ` Glauber Costa
2011-10-03 11:02 ` Kirill A. Shutemov
0 siblings, 1 reply; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 10:48 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On 10/03/2011 02:47 PM, Kirill A. Shutemov wrote:
> On Mon, Oct 03, 2011 at 02:18:37PM +0400, Glauber Costa wrote:
>> We aim to control the amount of kernel memory pinned at any
>> time by tcp sockets. To lay the foundations for this work,
>> this patch adds a pointer to the kmem_cgroup to the socket
>> structure.
>>
>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>> CC: David S. Miller<davem@davemloft.net>
>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>> CC: Eric W. Biederman<ebiederm@xmission.com>
>> ---
>> include/linux/memcontrol.h | 15 +++++++++++++++
>> include/net/sock.h | 2 ++
>> mm/memcontrol.c | 33 +++++++++++++++++++++++++++++++++
>> net/core/sock.c | 3 +++
>> 4 files changed, 53 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
>> index 3b535db..2cb9226 100644
>> --- a/include/linux/memcontrol.h
>> +++ b/include/linux/memcontrol.h
>> @@ -395,5 +395,20 @@ mem_cgroup_print_bad_page(struct page *page)
>> }
>> #endif
>>
>> +#ifdef CONFIG_INET
>> +struct sock;
>> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
>> +void sock_update_memcg(struct sock *sk);
>> +void sock_release_memcg(struct sock *sk);
>> +
>> +#else
>> +static inline void sock_update_memcg(struct sock *sk)
>> +{
>> +}
>> +static inline void sock_release_memcg(struct sock *sk)
>> +{
>> +}
>> +#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
>> +#endif /* CONFIG_INET */
>> #endif /* _LINUX_MEMCONTROL_H */
>>
>> diff --git a/include/net/sock.h b/include/net/sock.h
>> index 8e4062f..afe1467 100644
>> --- a/include/net/sock.h
>> +++ b/include/net/sock.h
>> @@ -228,6 +228,7 @@ struct sock_common {
>> * @sk_security: used by security modules
>> * @sk_mark: generic packet mark
>> * @sk_classid: this socket's cgroup classid
>> + * @sk_cgrp: this socket's kernel memory (kmem) cgroup
>> * @sk_write_pending: a write to stream socket waits to start
>> * @sk_state_change: callback to indicate change in the state of the sock
>> * @sk_data_ready: callback to indicate there is data to be processed
>> @@ -339,6 +340,7 @@ struct sock {
>> #endif
>> __u32 sk_mark;
>> u32 sk_classid;
>> + struct mem_cgroup *sk_cgrp;
>> void (*sk_state_change)(struct sock *sk);
>> void (*sk_data_ready)(struct sock *sk, int bytes);
>> void (*sk_write_space)(struct sock *sk);
>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>> index 8aaf4ce..08a520e 100644
>> --- a/mm/memcontrol.c
>> +++ b/mm/memcontrol.c
>> @@ -339,6 +339,39 @@ struct mem_cgroup {
>> spinlock_t pcp_counter_lock;
>> };
>>
>> +/* Writing them here to avoid exposing memcg's inner layout */
>> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
>> +#ifdef CONFIG_INET
>> +#include<net/sock.h>
>> +
>> +void sock_update_memcg(struct sock *sk)
>> +{
>> + /* right now a socket spends its whole life in the same cgroup */
>> + BUG_ON(sk->sk_cgrp);
>
> Do we really want to panic in this case?
>
> What about WARN() + return?
Kirill,
I am keeping this code just to have something workable in between.
If you take a look at the last patch, this hunk is going away anyway.
So if you don't oppose it, I'll just keep it to avoid rebasing it.
> Otherwise: Acked-by: Kirill A. Shutemov<kirill@shutemov.name>
>
>> +
>> + rcu_read_lock();
>> + sk->sk_cgrp = mem_cgroup_from_task(current);
>> +
>> + /*
>> + * We don't need to protect against anything task-related, because
>> + * we are basically stuck with the sock pointer that won't change,
>> + * even if the task that originated the socket changes cgroups.
>> + *
>> + * What we do have to guarantee, is that the chain leading us to
>> + * the top level won't change under our noses. Incrementing the
>> + * reference count via cgroup_exclude_rmdir guarantees that.
>> + */
>> + cgroup_exclude_rmdir(mem_cgroup_css(sk->sk_cgrp));
>> + rcu_read_unlock();
>> +}
>
--
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 2/8] socket: initial cgroup code.
2011-10-03 10:48 ` Glauber Costa
@ 2011-10-03 11:02 ` Kirill A. Shutemov
2011-10-03 11:03 ` Glauber Costa
0 siblings, 1 reply; 34+ messages in thread
From: Kirill A. Shutemov @ 2011-10-03 11:02 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On Mon, Oct 03, 2011 at 02:48:15PM +0400, Glauber Costa wrote:
> On 10/03/2011 02:47 PM, Kirill A. Shutemov wrote:
> > On Mon, Oct 03, 2011 at 02:18:37PM +0400, Glauber Costa wrote:
> >> We aim to control the amount of kernel memory pinned at any
> >> time by tcp sockets. To lay the foundations for this work,
> >> this patch adds a pointer to the kmem_cgroup to the socket
> >> structure.
> >>
> >> Signed-off-by: Glauber Costa<glommer@parallels.com>
> >> CC: David S. Miller<davem@davemloft.net>
> >> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
> >> CC: Eric W. Biederman<ebiederm@xmission.com>
> >> ---
> >> include/linux/memcontrol.h | 15 +++++++++++++++
> >> include/net/sock.h | 2 ++
> >> mm/memcontrol.c | 33 +++++++++++++++++++++++++++++++++
> >> net/core/sock.c | 3 +++
> >> 4 files changed, 53 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> >> index 3b535db..2cb9226 100644
> >> --- a/include/linux/memcontrol.h
> >> +++ b/include/linux/memcontrol.h
> >> @@ -395,5 +395,20 @@ mem_cgroup_print_bad_page(struct page *page)
> >> }
> >> #endif
> >>
> >> +#ifdef CONFIG_INET
> >> +struct sock;
> >> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> >> +void sock_update_memcg(struct sock *sk);
> >> +void sock_release_memcg(struct sock *sk);
> >> +
> >> +#else
> >> +static inline void sock_update_memcg(struct sock *sk)
> >> +{
> >> +}
> >> +static inline void sock_release_memcg(struct sock *sk)
> >> +{
> >> +}
> >> +#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
> >> +#endif /* CONFIG_INET */
> >> #endif /* _LINUX_MEMCONTROL_H */
> >>
> >> diff --git a/include/net/sock.h b/include/net/sock.h
> >> index 8e4062f..afe1467 100644
> >> --- a/include/net/sock.h
> >> +++ b/include/net/sock.h
> >> @@ -228,6 +228,7 @@ struct sock_common {
> >> * @sk_security: used by security modules
> >> * @sk_mark: generic packet mark
> >> * @sk_classid: this socket's cgroup classid
> >> + * @sk_cgrp: this socket's kernel memory (kmem) cgroup
> >> * @sk_write_pending: a write to stream socket waits to start
> >> * @sk_state_change: callback to indicate change in the state of the sock
> >> * @sk_data_ready: callback to indicate there is data to be processed
> >> @@ -339,6 +340,7 @@ struct sock {
> >> #endif
> >> __u32 sk_mark;
> >> u32 sk_classid;
> >> + struct mem_cgroup *sk_cgrp;
> >> void (*sk_state_change)(struct sock *sk);
> >> void (*sk_data_ready)(struct sock *sk, int bytes);
> >> void (*sk_write_space)(struct sock *sk);
> >> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> >> index 8aaf4ce..08a520e 100644
> >> --- a/mm/memcontrol.c
> >> +++ b/mm/memcontrol.c
> >> @@ -339,6 +339,39 @@ struct mem_cgroup {
> >> spinlock_t pcp_counter_lock;
> >> };
> >>
> >> +/* Writing them here to avoid exposing memcg's inner layout */
> >> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> >> +#ifdef CONFIG_INET
> >> +#include<net/sock.h>
> >> +
> >> +void sock_update_memcg(struct sock *sk)
> >> +{
> >> + /* right now a socket spends its whole life in the same cgroup */
> >> + BUG_ON(sk->sk_cgrp);
> >
> > Do we really want to panic in this case?
> >
> > What about WARN() + return?
>
> Kirill,
>
> I am keeping this code just to have something workable in between.
> If you take a look at the last patch, this hunk is going away anyway.
>
> So if you don't oppose it, I'll just keep it to avoid rebasing it.
Sorry, but I don't see where you remove BUG_ON().
You remove only cgroup_exclude_rmdir().
--
Kirill A. Shutemov
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 2/8] socket: initial cgroup code.
2011-10-03 11:02 ` Kirill A. Shutemov
@ 2011-10-03 11:03 ` Glauber Costa
0 siblings, 0 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 11:03 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On 10/03/2011 03:02 PM, Kirill A. Shutemov wrote:
> On Mon, Oct 03, 2011 at 02:48:15PM +0400, Glauber Costa wrote:
>> On 10/03/2011 02:47 PM, Kirill A. Shutemov wrote:
>>> On Mon, Oct 03, 2011 at 02:18:37PM +0400, Glauber Costa wrote:
>>>> We aim to control the amount of kernel memory pinned at any
>>>> time by tcp sockets. To lay the foundations for this work,
>>>> this patch adds a pointer to the kmem_cgroup to the socket
>>>> structure.
>>>>
>>>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>>>> CC: David S. Miller<davem@davemloft.net>
>>>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>>>> CC: Eric W. Biederman<ebiederm@xmission.com>
>>>> ---
>>>> include/linux/memcontrol.h | 15 +++++++++++++++
>>>> include/net/sock.h | 2 ++
>>>> mm/memcontrol.c | 33 +++++++++++++++++++++++++++++++++
>>>> net/core/sock.c | 3 +++
>>>> 4 files changed, 53 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
>>>> index 3b535db..2cb9226 100644
>>>> --- a/include/linux/memcontrol.h
>>>> +++ b/include/linux/memcontrol.h
>>>> @@ -395,5 +395,20 @@ mem_cgroup_print_bad_page(struct page *page)
>>>> }
>>>> #endif
>>>>
>>>> +#ifdef CONFIG_INET
>>>> +struct sock;
>>>> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
>>>> +void sock_update_memcg(struct sock *sk);
>>>> +void sock_release_memcg(struct sock *sk);
>>>> +
>>>> +#else
>>>> +static inline void sock_update_memcg(struct sock *sk)
>>>> +{
>>>> +}
>>>> +static inline void sock_release_memcg(struct sock *sk)
>>>> +{
>>>> +}
>>>> +#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
>>>> +#endif /* CONFIG_INET */
>>>> #endif /* _LINUX_MEMCONTROL_H */
>>>>
>>>> diff --git a/include/net/sock.h b/include/net/sock.h
>>>> index 8e4062f..afe1467 100644
>>>> --- a/include/net/sock.h
>>>> +++ b/include/net/sock.h
>>>> @@ -228,6 +228,7 @@ struct sock_common {
>>>> * @sk_security: used by security modules
>>>> * @sk_mark: generic packet mark
>>>> * @sk_classid: this socket's cgroup classid
>>>> + * @sk_cgrp: this socket's kernel memory (kmem) cgroup
>>>> * @sk_write_pending: a write to stream socket waits to start
>>>> * @sk_state_change: callback to indicate change in the state of the sock
>>>> * @sk_data_ready: callback to indicate there is data to be processed
>>>> @@ -339,6 +340,7 @@ struct sock {
>>>> #endif
>>>> __u32 sk_mark;
>>>> u32 sk_classid;
>>>> + struct mem_cgroup *sk_cgrp;
>>>> void (*sk_state_change)(struct sock *sk);
>>>> void (*sk_data_ready)(struct sock *sk, int bytes);
>>>> void (*sk_write_space)(struct sock *sk);
>>>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>>>> index 8aaf4ce..08a520e 100644
>>>> --- a/mm/memcontrol.c
>>>> +++ b/mm/memcontrol.c
>>>> @@ -339,6 +339,39 @@ struct mem_cgroup {
>>>> spinlock_t pcp_counter_lock;
>>>> };
>>>>
>>>> +/* Writing them here to avoid exposing memcg's inner layout */
>>>> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
>>>> +#ifdef CONFIG_INET
>>>> +#include<net/sock.h>
>>>> +
>>>> +void sock_update_memcg(struct sock *sk)
>>>> +{
>>>> + /* right now a socket spends its whole life in the same cgroup */
>>>> + BUG_ON(sk->sk_cgrp);
>>>
>>> Do we really want to panic in this case?
>>>
>>> What about WARN() + return?
>>
>> Kirill,
>>
>> I am keeping this code just to have something workable in between.
>> If you take a look at the last patch, this hunk is going away anyway.
>>
>> So if you don't oppose it, I'll just keep it to avoid rebasing it.
>
> Sorry, but I don't see where you remove BUG_ON().
> You remove only cgroup_exclude_rmdir().
>
Oh yeah, you are right, sorry.
So, I guess some kind of check is sane here. I am happy to change it to
WARN_ON.
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup
2011-10-03 10:18 ` [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup Glauber Costa
@ 2011-10-03 12:14 ` Kirill A. Shutemov
2011-10-03 12:19 ` Glauber Costa
0 siblings, 1 reply; 34+ messages in thread
From: Kirill A. Shutemov @ 2011-10-03 12:14 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On Mon, Oct 03, 2011 at 02:18:42PM +0400, Glauber Costa wrote:
> This patch introduces kmem.tcp_current_memory file, living in the
> kmem_cgroup filesystem. It is a simple read-only file that displays the
> amount of kernel memory currently consumed by the cgroup.
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.com>
> ---
> Documentation/cgroups/memory.txt | 1 +
> mm/memcontrol.c | 11 +++++++++++
> 2 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> index 1ffde3e..f5a539d 100644
> --- a/Documentation/cgroups/memory.txt
> +++ b/Documentation/cgroups/memory.txt
> @@ -79,6 +79,7 @@ Brief summary of control files.
> memory.independent_kmem_limit # select whether or not kernel memory limits are
> independent of user limits
> memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
> + memory.kmem.tcp.current_memory # show current tcp buf memory allocation
Both are in pages, right?
Shouldn't it be scaled to bytes and named uniform with other memcg file?
memory.kmem.tcp.limit_in_bytes/usage_in_bytes.
--
Kirill A. Shutemov
--
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup
2011-10-03 12:14 ` Kirill A. Shutemov
@ 2011-10-03 12:19 ` Glauber Costa
2011-10-03 12:25 ` Kirill A. Shutemov
0 siblings, 1 reply; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 12:19 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On 10/03/2011 04:14 PM, Kirill A. Shutemov wrote:
> On Mon, Oct 03, 2011 at 02:18:42PM +0400, Glauber Costa wrote:
>> This patch introduces kmem.tcp_current_memory file, living in the
>> kmem_cgroup filesystem. It is a simple read-only file that displays the
>> amount of kernel memory currently consumed by the cgroup.
>>
>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>> CC: David S. Miller<davem@davemloft.net>
>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>> CC: Eric W. Biederman<ebiederm@xmission.com>
>> ---
>> Documentation/cgroups/memory.txt | 1 +
>> mm/memcontrol.c | 11 +++++++++++
>> 2 files changed, 12 insertions(+), 0 deletions(-)
>>
>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
>> index 1ffde3e..f5a539d 100644
>> --- a/Documentation/cgroups/memory.txt
>> +++ b/Documentation/cgroups/memory.txt
>> @@ -79,6 +79,7 @@ Brief summary of control files.
>> memory.independent_kmem_limit # select whether or not kernel memory limits are
>> independent of user limits
>> memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
>> + memory.kmem.tcp.current_memory # show current tcp buf memory allocation
>
> Both are in pages, right?
> Shouldn't it be scaled to bytes and named uniform with other memcg file?
> memory.kmem.tcp.limit_in_bytes/usage_in_bytes.
>
You are absolutely correct.
Since the internal tcp comparison works, I just ended up never noticing
this.
Thanks.
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup
2011-10-03 12:19 ` Glauber Costa
@ 2011-10-03 12:25 ` Kirill A. Shutemov
2011-10-03 12:26 ` Glauber Costa
0 siblings, 1 reply; 34+ messages in thread
From: Kirill A. Shutemov @ 2011-10-03 12:25 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On Mon, Oct 03, 2011 at 04:19:18PM +0400, Glauber Costa wrote:
> On 10/03/2011 04:14 PM, Kirill A. Shutemov wrote:
> > On Mon, Oct 03, 2011 at 02:18:42PM +0400, Glauber Costa wrote:
> >> This patch introduces kmem.tcp_current_memory file, living in the
> >> kmem_cgroup filesystem. It is a simple read-only file that displays the
> >> amount of kernel memory currently consumed by the cgroup.
> >>
> >> Signed-off-by: Glauber Costa<glommer@parallels.com>
> >> CC: David S. Miller<davem@davemloft.net>
> >> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
> >> CC: Eric W. Biederman<ebiederm@xmission.com>
> >> ---
> >> Documentation/cgroups/memory.txt | 1 +
> >> mm/memcontrol.c | 11 +++++++++++
> >> 2 files changed, 12 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> >> index 1ffde3e..f5a539d 100644
> >> --- a/Documentation/cgroups/memory.txt
> >> +++ b/Documentation/cgroups/memory.txt
> >> @@ -79,6 +79,7 @@ Brief summary of control files.
> >> memory.independent_kmem_limit # select whether or not kernel memory limits are
> >> independent of user limits
> >> memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
> >> + memory.kmem.tcp.current_memory # show current tcp buf memory allocation
> >
> > Both are in pages, right?
> > Shouldn't it be scaled to bytes and named uniform with other memcg file?
> > memory.kmem.tcp.limit_in_bytes/usage_in_bytes.
> >
> You are absolutely correct.
> Since the internal tcp comparison works, I just ended up never noticing
> this.
Should we have failcnt and max_usage_in_bytes for tcp as well?
--
Kirill A. Shutemov
--
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup
2011-10-03 12:25 ` Kirill A. Shutemov
@ 2011-10-03 12:26 ` Glauber Costa
2011-10-03 12:36 ` Kirill A. Shutemov
0 siblings, 1 reply; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 12:26 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On 10/03/2011 04:25 PM, Kirill A. Shutemov wrote:
> On Mon, Oct 03, 2011 at 04:19:18PM +0400, Glauber Costa wrote:
>> On 10/03/2011 04:14 PM, Kirill A. Shutemov wrote:
>>> On Mon, Oct 03, 2011 at 02:18:42PM +0400, Glauber Costa wrote:
>>>> This patch introduces kmem.tcp_current_memory file, living in the
>>>> kmem_cgroup filesystem. It is a simple read-only file that displays the
>>>> amount of kernel memory currently consumed by the cgroup.
>>>>
>>>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>>>> CC: David S. Miller<davem@davemloft.net>
>>>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>>>> CC: Eric W. Biederman<ebiederm@xmission.com>
>>>> ---
>>>> Documentation/cgroups/memory.txt | 1 +
>>>> mm/memcontrol.c | 11 +++++++++++
>>>> 2 files changed, 12 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
>>>> index 1ffde3e..f5a539d 100644
>>>> --- a/Documentation/cgroups/memory.txt
>>>> +++ b/Documentation/cgroups/memory.txt
>>>> @@ -79,6 +79,7 @@ Brief summary of control files.
>>>> memory.independent_kmem_limit # select whether or not kernel memory limits are
>>>> independent of user limits
>>>> memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
>>>> + memory.kmem.tcp.current_memory # show current tcp buf memory allocation
>>>
>>> Both are in pages, right?
>>> Shouldn't it be scaled to bytes and named uniform with other memcg file?
>>> memory.kmem.tcp.limit_in_bytes/usage_in_bytes.
>>>
>> You are absolutely correct.
>> Since the internal tcp comparison works, I just ended up never noticing
>> this.
>
> Should we have failcnt and max_usage_in_bytes for tcp as well?
>
Well, we get a fail count from the tracer anyway, so I don't really see
a need for that. I see value in having it for the slab allocation
itself, but since this only controls the memory pressure framework, I
think we can live without it.
That said, this is not a strong opinion. I can add it if you'd prefer.
--
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup
2011-10-03 12:36 ` Kirill A. Shutemov
@ 2011-10-03 12:36 ` Glauber Costa
2011-10-04 9:10 ` Glauber Costa
1 sibling, 0 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-03 12:36 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On 10/03/2011 04:36 PM, Kirill A. Shutemov wrote:
> On Mon, Oct 03, 2011 at 04:26:41PM +0400, Glauber Costa wrote:
>> On 10/03/2011 04:25 PM, Kirill A. Shutemov wrote:
>>> On Mon, Oct 03, 2011 at 04:19:18PM +0400, Glauber Costa wrote:
>>>> On 10/03/2011 04:14 PM, Kirill A. Shutemov wrote:
>>>>> On Mon, Oct 03, 2011 at 02:18:42PM +0400, Glauber Costa wrote:
>>>>>> This patch introduces kmem.tcp_current_memory file, living in the
>>>>>> kmem_cgroup filesystem. It is a simple read-only file that displays the
>>>>>> amount of kernel memory currently consumed by the cgroup.
>>>>>>
>>>>>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>>>>>> CC: David S. Miller<davem@davemloft.net>
>>>>>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>>>>>> CC: Eric W. Biederman<ebiederm@xmission.com>
>>>>>> ---
>>>>>> Documentation/cgroups/memory.txt | 1 +
>>>>>> mm/memcontrol.c | 11 +++++++++++
>>>>>> 2 files changed, 12 insertions(+), 0 deletions(-)
>>>>>>
>>>>>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
>>>>>> index 1ffde3e..f5a539d 100644
>>>>>> --- a/Documentation/cgroups/memory.txt
>>>>>> +++ b/Documentation/cgroups/memory.txt
>>>>>> @@ -79,6 +79,7 @@ Brief summary of control files.
>>>>>> memory.independent_kmem_limit # select whether or not kernel memory limits are
>>>>>> independent of user limits
>>>>>> memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
>>>>>> + memory.kmem.tcp.current_memory # show current tcp buf memory allocation
>>>>>
>>>>> Both are in pages, right?
>>>>> Shouldn't it be scaled to bytes and named uniform with other memcg file?
>>>>> memory.kmem.tcp.limit_in_bytes/usage_in_bytes.
>>>>>
>>>> You are absolutely correct.
>>>> Since the internal tcp comparison works, I just ended up never noticing
>>>> this.
>>>
>>> Should we have failcnt and max_usage_in_bytes for tcp as well?
>>>
>>
>> Well, we get a fail count from the tracer anyway, so I don't really see
>> a need for that. I see value in having it for the slab allocation
>> itself, but since this only controls the memory pressure framework, I
>> think we can live without it.
>>
>> That said, this is not a strong opinion. I can add it if you'd prefer.
>
> It's good for userspace to have the same set of files for all domains:
> - memory;
> - memory.memsw;
> - memory.kmem;
> - memory.kmem.tcp;
> - etc.
> Userspace can reuse code for handling them in this case.
>
Fine.
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup
2011-10-03 12:26 ` Glauber Costa
@ 2011-10-03 12:36 ` Kirill A. Shutemov
2011-10-03 12:36 ` Glauber Costa
2011-10-04 9:10 ` Glauber Costa
0 siblings, 2 replies; 34+ messages in thread
From: Kirill A. Shutemov @ 2011-10-03 12:36 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On Mon, Oct 03, 2011 at 04:26:41PM +0400, Glauber Costa wrote:
> On 10/03/2011 04:25 PM, Kirill A. Shutemov wrote:
> > On Mon, Oct 03, 2011 at 04:19:18PM +0400, Glauber Costa wrote:
> >> On 10/03/2011 04:14 PM, Kirill A. Shutemov wrote:
> >>> On Mon, Oct 03, 2011 at 02:18:42PM +0400, Glauber Costa wrote:
> >>>> This patch introduces kmem.tcp_current_memory file, living in the
> >>>> kmem_cgroup filesystem. It is a simple read-only file that displays the
> >>>> amount of kernel memory currently consumed by the cgroup.
> >>>>
> >>>> Signed-off-by: Glauber Costa<glommer@parallels.com>
> >>>> CC: David S. Miller<davem@davemloft.net>
> >>>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
> >>>> CC: Eric W. Biederman<ebiederm@xmission.com>
> >>>> ---
> >>>> Documentation/cgroups/memory.txt | 1 +
> >>>> mm/memcontrol.c | 11 +++++++++++
> >>>> 2 files changed, 12 insertions(+), 0 deletions(-)
> >>>>
> >>>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> >>>> index 1ffde3e..f5a539d 100644
> >>>> --- a/Documentation/cgroups/memory.txt
> >>>> +++ b/Documentation/cgroups/memory.txt
> >>>> @@ -79,6 +79,7 @@ Brief summary of control files.
> >>>> memory.independent_kmem_limit # select whether or not kernel memory limits are
> >>>> independent of user limits
> >>>> memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
> >>>> + memory.kmem.tcp.current_memory # show current tcp buf memory allocation
> >>>
> >>> Both are in pages, right?
> >>> Shouldn't it be scaled to bytes and named uniform with other memcg file?
> >>> memory.kmem.tcp.limit_in_bytes/usage_in_bytes.
> >>>
> >> You are absolutely correct.
> >> Since the internal tcp comparison works, I just ended up never noticing
> >> this.
> >
> > Should we have failcnt and max_usage_in_bytes for tcp as well?
> >
>
> Well, we get a fail count from the tracer anyway, so I don't really see
> a need for that. I see value in having it for the slab allocation
> itself, but since this only controls the memory pressure framework, I
> think we can live without it.
>
> That said, this is not a strong opinion. I can add it if you'd prefer.
It's good for userspace to have the same set of files for all domains:
- memory;
- memory.memsw;
- memory.kmem;
- memory.kmem.tcp;
- etc.
Userspace can reuse code for handling them in this case.
--
Kirill A. Shutemov
--
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling.
2011-10-03 10:18 ` [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
@ 2011-10-03 15:13 ` Andrew Vagin
2011-10-04 0:57 ` KAMEZAWA Hiroyuki
1 sibling, 0 replies; 34+ messages in thread
From: Andrew Vagin @ 2011-10-03 15:13 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, kirill
I have some compilation issues:
[root@ws-qual linux-2.6]# make -j 32
CHK include/linux/version.h
CHK include/generated/utsrelease.h
CALL scripts/checksyscalls.sh
CHK include/generated/compile.h
CHK kernel/config_data.h
CHK include/linux/version.h
Building modules, stage 2.
MODPOST 78 modules
Kernel: arch/x86/boot/bzImage is ready (#127)
ERROR: "memory_pressure_tcp" [net/ipv6/ipv6.ko] undefined!
ERROR: "tcp_sysctl_mem" [net/ipv6/ipv6.ko] undefined!
ERROR: "memory_allocated_tcp" [net/ipv6/ipv6.ko] undefined!
ERROR: "tcp_enter_memory_pressure" [net/ipv6/ipv6.ko] undefined!
ERROR: "sockets_allocated_tcp" [net/ipv6/ipv6.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2
I compile ipv6 as module.
mm/memcontrol.c
I think you forgot export some functions.
On Mon, Oct 03, 2011 at 02:18:38PM +0400, Glauber Costa wrote:
> This patch converts struct sock fields memory_pressure,
> memory_allocated, sockets_allocated, and sysctl_mem (now prot_mem)
> to function pointers, receiving a struct mem_cgroup parameter.
>
> enter_memory_pressure is kept the same, since all its callers
> have socket a context, and the kmem_cgroup can be derived from
> the socket itself.
>
> To keep things working, the patch convert all users of those fields
> to use acessor functions.
>
> In my benchmarks I didn't see a significant performance difference
> with this patch applied compared to a baseline (around 1 % diff, thus
> inside error margin).
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.com>
> ---
> crypto/af_alg.c | 7 ++-
> include/linux/memcontrol.h | 29 +++++++++++-
> include/net/sock.h | 112 +++++++++++++++++++++++++++++++++++++++++--
> include/net/tcp.h | 11 +++--
> include/net/udp.h | 3 +-
> include/trace/events/sock.h | 10 ++--
> mm/memcontrol.c | 45 +++++++++++++++++-
> net/core/sock.c | 62 ++++++++++++++----------
> net/decnet/af_decnet.c | 21 +++++++-
> net/ipv4/proc.c | 7 ++-
> net/ipv4/tcp.c | 27 +++++++++-
> net/ipv4/tcp_input.c | 12 ++--
> net/ipv4/tcp_ipv4.c | 12 ++--
> net/ipv4/tcp_output.c | 2 +-
> net/ipv4/tcp_timer.c | 2 +-
> net/ipv4/udp.c | 20 ++++++--
> net/ipv6/tcp_ipv6.c | 10 ++--
> net/ipv6/udp.c | 4 +-
> net/sctp/socket.c | 35 ++++++++++---
> 19 files changed, 345 insertions(+), 86 deletions(-)
>
> diff --git a/crypto/af_alg.c b/crypto/af_alg.c
> index ac33d5f..9f41324 100644
> --- a/crypto/af_alg.c
> +++ b/crypto/af_alg.c
> @@ -29,10 +29,15 @@ struct alg_type_list {
>
> static atomic_long_t alg_memory_allocated;
>
> +static atomic_long_t *memory_allocated_alg(struct mem_cgroup *memcg)
> +{
> + return &alg_memory_allocated;
> +}
> +
> static struct proto alg_proto = {
> .name = "ALG",
> .owner = THIS_MODULE,
> - .memory_allocated = &alg_memory_allocated,
> + .memory_allocated = memory_allocated_alg,
> .obj_size = sizeof(struct alg_sock),
> };
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 2cb9226..d0b973c 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -380,6 +380,10 @@ static inline
> void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx)
> {
> }
> +static inline struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
> +{
> + return NULL;
> +}
> #endif /* CONFIG_CGROUP_MEM_CONT */
>
> #if !defined(CONFIG_CGROUP_MEM_RES_CTLR) || !defined(CONFIG_DEBUG_VM)
> @@ -397,11 +401,34 @@ mem_cgroup_print_bad_page(struct page *page)
>
> #ifdef CONFIG_INET
> struct sock;
> +struct proto;
> #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> void sock_update_memcg(struct sock *sk);
> void sock_release_memcg(struct sock *sk);
> -
> +void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
> + int amt, int *parent_failure);
> +void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt);
> +void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot);
> +void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot);
> #else
> +/* memcontrol includes sockets.h, that includes memcontrol.h ... */
> +static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
> + struct proto *prot, int amt,
> + int *parent_failure)
> +{
> +}
> +static inline void memcg_sock_mem_free(struct mem_cgroup *mem,
> + struct proto *prot, int amt)
> +{
> +}
> +static inline void memcg_sockets_allocated_dec(struct mem_cgroup *mem,
> + struct proto *prot)
> +{
> +}
> +static inline void memcg_sockets_allocated_inc(struct mem_cgroup *mem,
> + struct proto *prot)
> +{
> +}
> static inline void sock_update_memcg(struct sock *sk)
> {
> }
> diff --git a/include/net/sock.h b/include/net/sock.h
> index afe1467..c6983cf 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -54,6 +54,7 @@
> #include <linux/security.h>
> #include <linux/slab.h>
> #include <linux/uaccess.h>
> +#include <linux/cgroup.h>
>
> #include <linux/filter.h>
> #include <linux/rculist_nulls.h>
> @@ -168,6 +169,8 @@ struct sock_common {
> /* public: */
> };
>
> +struct mem_cgroup;
> +
> /**
> * struct sock - network layer representation of sockets
> * @__sk_common: shared layout with inet_timewait_sock
> @@ -786,18 +789,32 @@ struct proto {
> unsigned int inuse_idx;
> #endif
>
> + /*
> + * per-cgroup memory tracking:
> + *
> + * The following functions track memory consumption of network buffers
> + * by cgroup (kmem_cgroup) for the current protocol. As of the rest
> + * of the fields in this structure, not all protocols are required
> + * to implement them. Protocols that don't want to do per-cgroup
> + * memory pressure management, can just assume the root cgroup is used.
> + *
> + */
> /* Memory pressure */
> void (*enter_memory_pressure)(struct sock *sk);
> - atomic_long_t *memory_allocated; /* Current allocated memory. */
> - struct percpu_counter *sockets_allocated; /* Current number of sockets. */
> + /* Pointer to the current memory allocation of this cgroup. */
> + atomic_long_t *(*memory_allocated)(struct mem_cgroup *memcg);
> + /* Pointer to the current number of sockets in this cgroup. */
> + struct percpu_counter *(*sockets_allocated)(struct mem_cgroup *memcg);
> /*
> - * Pressure flag: try to collapse.
> + * Per cgroup pointer to the pressure flag: try to collapse.
> * Technical note: it is used by multiple contexts non atomically.
> * All the __sk_mem_schedule() is of this nature: accounting
> * is strict, actions are advisory and have some latency.
> */
> - int *memory_pressure;
> - long *sysctl_mem;
> + int *(*memory_pressure)(struct mem_cgroup *memcg);
> + /* Pointer to the per-cgroup version of the the sysctl_mem field */
> + long *(*prot_mem)(struct mem_cgroup *memcg);
> +
> int *sysctl_wmem;
> int *sysctl_rmem;
> int max_header;
> @@ -856,6 +873,91 @@ static inline void sk_refcnt_debug_release(const struct sock *sk)
> #define sk_refcnt_debug_release(sk) do { } while (0)
> #endif /* SOCK_REFCNT_DEBUG */
>
> +#include <linux/memcontrol.h>
> +static inline int *sk_memory_pressure(struct sock *sk)
> +{
> + int *ret = NULL;
> + if (sk->sk_prot->memory_pressure)
> + ret = sk->sk_prot->memory_pressure(sk->sk_cgrp);
> + return ret;
> +}
> +
> +static inline long sk_prot_mem(struct sock *sk, int index)
> +{
> + long *prot = sk->sk_prot->prot_mem(sk->sk_cgrp);
> + return prot[index];
> +}
> +
> +static inline long
> +sk_memory_allocated(struct sock *sk)
> +{
> + struct proto *prot = sk->sk_prot;
> + struct mem_cgroup *cg = sk->sk_cgrp;
> +
> + return atomic_long_read(prot->memory_allocated(cg));
> +}
> +
> +static inline long
> +sk_memory_allocated_add(struct sock *sk, int amt, int *parent_failure)
> +{
> + struct proto *prot = sk->sk_prot;
> + struct mem_cgroup *cg = sk->sk_cgrp;
> + long allocated;
> +
> + allocated = atomic_long_add_return(amt, prot->memory_allocated(cg));
> + memcg_sock_mem_alloc(cg, prot, amt, parent_failure);
> + return allocated;
> +}
> +
> +static inline void
> +sk_memory_allocated_sub(struct sock *sk, int amt)
> +{
> + struct proto *prot = sk->sk_prot;
> + struct mem_cgroup *cg = sk->sk_cgrp;
> +
> + atomic_long_sub(amt, prot->memory_allocated(cg));
> + memcg_sock_mem_free(cg, prot, amt);
> +}
> +
> +static inline void sk_sockets_allocated_dec(struct sock *sk)
> +{
> + struct proto *prot = sk->sk_prot;
> + struct mem_cgroup *cg = sk->sk_cgrp;
> +
> + percpu_counter_dec(prot->sockets_allocated(cg));
> + memcg_sockets_allocated_dec(cg, prot);
> +}
> +
> +static inline void sk_sockets_allocated_inc(struct sock *sk)
> +{
> + struct proto *prot = sk->sk_prot;
> + struct mem_cgroup *cg = sk->sk_cgrp;
> +
> + percpu_counter_inc(prot->sockets_allocated(cg));
> + memcg_sockets_allocated_inc(cg, prot);
> +}
> +
> +static inline int
> +sk_sockets_allocated_read_positive(struct sock *sk)
> +{
> + struct proto *prot = sk->sk_prot;
> + struct mem_cgroup *cg = sk->sk_cgrp;
> +
> + return percpu_counter_sum_positive(prot->sockets_allocated(cg));
> +}
> +
> +static inline int
> +kcg_sockets_allocated_sum_positive(struct proto *prot, struct mem_cgroup *cg)
> +{
> + return percpu_counter_sum_positive(prot->sockets_allocated(cg));
> +}
> +
> +static inline long
> +kcg_memory_allocated(struct proto *prot, struct mem_cgroup *cg)
> +{
> + return atomic_long_read(prot->memory_allocated(cg));
> +}
> +
>
> #ifdef CONFIG_PROC_FS
> /* Called with local bh disabled */
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index 149a415..2200694 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -45,6 +45,7 @@
> #include <net/dst.h>
>
> #include <linux/seq_file.h>
> +#include <linux/memcontrol.h>
>
> extern struct inet_hashinfo tcp_hashinfo;
>
> @@ -253,9 +254,11 @@ extern int sysctl_tcp_cookie_size;
> extern int sysctl_tcp_thin_linear_timeouts;
> extern int sysctl_tcp_thin_dupack;
>
> -extern atomic_long_t tcp_memory_allocated;
> -extern struct percpu_counter tcp_sockets_allocated;
> -extern int tcp_memory_pressure;
> +struct mem_cgroup;
> +extern long *tcp_sysctl_mem(struct mem_cgroup *memcg);
> +struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg);
> +int *memory_pressure_tcp(struct mem_cgroup *memcg);
> +atomic_long_t *memory_allocated_tcp(struct mem_cgroup *memcg);
>
> /*
> * The next routines deal with comparing 32 bit unsigned ints
> @@ -286,7 +289,7 @@ static inline bool tcp_too_many_orphans(struct sock *sk, int shift)
> }
>
> if (sk->sk_wmem_queued > SOCK_MIN_SNDBUF &&
> - atomic_long_read(&tcp_memory_allocated) > sysctl_tcp_mem[2])
> + sk_memory_allocated(sk) > sk_prot_mem(sk, 2))
> return true;
> return false;
> }
> diff --git a/include/net/udp.h b/include/net/udp.h
> index 67ea6fc..b96ed51 100644
> --- a/include/net/udp.h
> +++ b/include/net/udp.h
> @@ -105,7 +105,8 @@ static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
>
> extern struct proto udp_prot;
>
> -extern atomic_long_t udp_memory_allocated;
> +atomic_long_t *memory_allocated_udp(struct mem_cgroup *memcg);
> +long *udp_sysctl_mem(struct mem_cgroup *memcg);
>
> /* sysctl variables for udp */
> extern long sysctl_udp_mem[3];
> diff --git a/include/trace/events/sock.h b/include/trace/events/sock.h
> index 779abb9..12a6083 100644
> --- a/include/trace/events/sock.h
> +++ b/include/trace/events/sock.h
> @@ -37,7 +37,7 @@ TRACE_EVENT(sock_exceed_buf_limit,
>
> TP_STRUCT__entry(
> __array(char, name, 32)
> - __field(long *, sysctl_mem)
> + __field(long *, prot_mem)
> __field(long, allocated)
> __field(int, sysctl_rmem)
> __field(int, rmem_alloc)
> @@ -45,7 +45,7 @@ TRACE_EVENT(sock_exceed_buf_limit,
>
> TP_fast_assign(
> strncpy(__entry->name, prot->name, 32);
> - __entry->sysctl_mem = prot->sysctl_mem;
> + __entry->prot_mem = sk->sk_prot->prot_mem(sk->sk_cgrp);
> __entry->allocated = allocated;
> __entry->sysctl_rmem = prot->sysctl_rmem[0];
> __entry->rmem_alloc = atomic_read(&sk->sk_rmem_alloc);
> @@ -54,9 +54,9 @@ TRACE_EVENT(sock_exceed_buf_limit,
> TP_printk("proto:%s sysctl_mem=%ld,%ld,%ld allocated=%ld "
> "sysctl_rmem=%d rmem_alloc=%d",
> __entry->name,
> - __entry->sysctl_mem[0],
> - __entry->sysctl_mem[1],
> - __entry->sysctl_mem[2],
> + __entry->prot_mem[0],
> + __entry->prot_mem[1],
> + __entry->prot_mem[2],
> __entry->allocated,
> __entry->sysctl_rmem,
> __entry->rmem_alloc)
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 08a520e..1586332 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -339,6 +339,7 @@ struct mem_cgroup {
> spinlock_t pcp_counter_lock;
> };
>
> +static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
> /* Writing them here to avoid exposing memcg's inner layout */
> #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> #ifdef CONFIG_INET
> @@ -369,6 +370,49 @@ void sock_release_memcg(struct sock *sk)
> {
> cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
> }
> +
> +void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
> + int amt, int *parent_failure)
> +{
> + mem = parent_mem_cgroup(mem);
> + for (; mem != NULL; mem = parent_mem_cgroup(mem)) {
> + long alloc;
> + long *prot_mem = prot->prot_mem(mem);
> + /*
> + * Large nestings are not the common case, and stopping in the
> + * middle would be complicated enough, that we bill it all the
> + * way through the root, and if needed, unbill everything later
> + */
> + alloc = atomic_long_add_return(amt,
> + prot->memory_allocated(mem));
> + *parent_failure |= (alloc > prot_mem[2]);
> + }
> +}
> +EXPORT_SYMBOL(memcg_sock_mem_alloc);
> +
> +void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt)
> +{
> + mem = parent_mem_cgroup(mem);
> + for (; mem != NULL; mem = parent_mem_cgroup(mem))
> + atomic_long_sub(amt, prot->memory_allocated(mem));
> +}
> +EXPORT_SYMBOL(memcg_sock_mem_free);
> +
> +void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot)
> +{
> + mem = parent_mem_cgroup(mem);
> + for (; mem; mem = parent_mem_cgroup(mem))
> + percpu_counter_dec(prot->sockets_allocated(mem));
> +}
> +EXPORT_SYMBOL(memcg_sockets_allocated_dec);
> +
> +void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot)
> +{
> + mem = parent_mem_cgroup(mem);
> + for (; mem; mem = parent_mem_cgroup(mem))
> + percpu_counter_inc(prot->sockets_allocated(mem));
> +}
> +EXPORT_SYMBOL(memcg_sockets_allocated_inc);
> #endif /* CONFIG_INET */
> #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
>
> @@ -454,7 +498,6 @@ enum mem_type {
>
> static void mem_cgroup_get(struct mem_cgroup *mem);
> static void mem_cgroup_put(struct mem_cgroup *mem);
> -static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
> static void drain_all_stock_async(struct mem_cgroup *mem);
>
> static struct mem_cgroup_per_zone *
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 5426ba0..6e3ace7 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -1293,7 +1293,7 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
> newsk->sk_wq = NULL;
>
> if (newsk->sk_prot->sockets_allocated)
> - percpu_counter_inc(newsk->sk_prot->sockets_allocated);
> + sk_sockets_allocated_inc(newsk);
>
> if (sock_flag(newsk, SOCK_TIMESTAMP) ||
> sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
> @@ -1684,30 +1684,33 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
> struct proto *prot = sk->sk_prot;
> int amt = sk_mem_pages(size);
> long allocated;
> + int *memory_pressure;
> + int parent_failure = 0;
>
> sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
> - allocated = atomic_long_add_return(amt, prot->memory_allocated);
> +
> + memory_pressure = sk_memory_pressure(sk);
> + allocated = sk_memory_allocated_add(sk, amt, &parent_failure);
> +
> + /* Over hard limit (we, or our parents) */
> + if (parent_failure || (allocated > sk_prot_mem(sk, 2)))
> + goto suppress_allocation;
>
> /* Under limit. */
> - if (allocated <= prot->sysctl_mem[0]) {
> - if (prot->memory_pressure && *prot->memory_pressure)
> - *prot->memory_pressure = 0;
> - return 1;
> - }
> + if (allocated <= sk_prot_mem(sk, 0))
> + if (memory_pressure && *memory_pressure)
> + *memory_pressure = 0;
>
> /* Under pressure. */
> - if (allocated > prot->sysctl_mem[1])
> + if (allocated > sk_prot_mem(sk, 1))
> if (prot->enter_memory_pressure)
> prot->enter_memory_pressure(sk);
>
> - /* Over hard limit. */
> - if (allocated > prot->sysctl_mem[2])
> - goto suppress_allocation;
> -
> /* guarantee minimum buffer size under pressure */
> if (kind == SK_MEM_RECV) {
> if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
> return 1;
> +
> } else { /* SK_MEM_SEND */
> if (sk->sk_type == SOCK_STREAM) {
> if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
> @@ -1717,13 +1720,13 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
> return 1;
> }
>
> - if (prot->memory_pressure) {
> + if (memory_pressure) {
> int alloc;
>
> - if (!*prot->memory_pressure)
> + if (!*memory_pressure)
> return 1;
> - alloc = percpu_counter_read_positive(prot->sockets_allocated);
> - if (prot->sysctl_mem[2] > alloc *
> + alloc = sk_sockets_allocated_read_positive(sk);
> + if (sk_prot_mem(sk, 2) > alloc *
> sk_mem_pages(sk->sk_wmem_queued +
> atomic_read(&sk->sk_rmem_alloc) +
> sk->sk_forward_alloc))
> @@ -1746,7 +1749,9 @@ suppress_allocation:
>
> /* Alas. Undo changes. */
> sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
> - atomic_long_sub(amt, prot->memory_allocated);
> +
> + sk_memory_allocated_sub(sk, amt);
> +
> return 0;
> }
> EXPORT_SYMBOL(__sk_mem_schedule);
> @@ -1757,15 +1762,15 @@ EXPORT_SYMBOL(__sk_mem_schedule);
> */
> void __sk_mem_reclaim(struct sock *sk)
> {
> - struct proto *prot = sk->sk_prot;
> + int *memory_pressure = sk_memory_pressure(sk);
>
> - atomic_long_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
> - prot->memory_allocated);
> + sk_memory_allocated_sub(sk,
> + sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
> sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
>
> - if (prot->memory_pressure && *prot->memory_pressure &&
> - (atomic_long_read(prot->memory_allocated) < prot->sysctl_mem[0]))
> - *prot->memory_pressure = 0;
> + if (memory_pressure && *memory_pressure &&
> + (sk_memory_allocated(sk) < sk_prot_mem(sk, 0)))
> + *memory_pressure = 0;
> }
> EXPORT_SYMBOL(__sk_mem_reclaim);
>
> @@ -2484,13 +2489,20 @@ static char proto_method_implemented(const void *method)
>
> static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
> {
> + struct mem_cgroup *cg = mem_cgroup_from_task(current);
> + int *memory_pressure = NULL;
> +
> + if (proto->memory_pressure)
> + memory_pressure = proto->memory_pressure(cg);
> +
> seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s "
> "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
> proto->name,
> proto->obj_size,
> sock_prot_inuse_get(seq_file_net(seq), proto),
> - proto->memory_allocated != NULL ? atomic_long_read(proto->memory_allocated) : -1L,
> - proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
> + proto->memory_allocated != NULL ?
> + kcg_memory_allocated(proto, cg) : -1L,
> + memory_pressure != NULL ? *memory_pressure ? "yes" : "no" : "NI",
> proto->max_header,
> proto->slab == NULL ? "no" : "yes",
> module_name(proto->owner),
> diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
> index 19acd00..39f83b4 100644
> --- a/net/decnet/af_decnet.c
> +++ b/net/decnet/af_decnet.c
> @@ -458,13 +458,28 @@ static void dn_enter_memory_pressure(struct sock *sk)
> }
> }
>
> +static atomic_long_t *memory_allocated_dn(struct mem_cgroup *memcg)
> +{
> + return &decnet_memory_allocated;
> +}
> +
> +static int *memory_pressure_dn(struct mem_cgroup *memcg)
> +{
> + return &dn_memory_pressure;
> +}
> +
> +static long *dn_sysctl_mem(struct mem_cgroup *memcg)
> +{
> + return sysctl_decnet_mem;
> +}
> +
> static struct proto dn_proto = {
> .name = "NSP",
> .owner = THIS_MODULE,
> .enter_memory_pressure = dn_enter_memory_pressure,
> - .memory_pressure = &dn_memory_pressure,
> - .memory_allocated = &decnet_memory_allocated,
> - .sysctl_mem = sysctl_decnet_mem,
> + .memory_pressure = memory_pressure_dn,
> + .memory_allocated = memory_allocated_dn,
> + .prot_mem = dn_sysctl_mem,
> .sysctl_wmem = sysctl_decnet_wmem,
> .sysctl_rmem = sysctl_decnet_rmem,
> .max_header = DN_MAX_NSP_DATA_HEADER + 64,
> diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
> index b14ec7d..ba56702 100644
> --- a/net/ipv4/proc.c
> +++ b/net/ipv4/proc.c
> @@ -52,20 +52,21 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
> {
> struct net *net = seq->private;
> int orphans, sockets;
> + struct mem_cgroup *cg = mem_cgroup_from_task(current);
>
> local_bh_disable();
> orphans = percpu_counter_sum_positive(&tcp_orphan_count);
> - sockets = percpu_counter_sum_positive(&tcp_sockets_allocated);
> + sockets = kcg_sockets_allocated_sum_positive(&tcp_prot, cg);
> local_bh_enable();
>
> socket_seq_show(seq);
> seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
> sock_prot_inuse_get(net, &tcp_prot), orphans,
> tcp_death_row.tw_count, sockets,
> - atomic_long_read(&tcp_memory_allocated));
> + kcg_memory_allocated(&tcp_prot, cg));
> seq_printf(seq, "UDP: inuse %d mem %ld\n",
> sock_prot_inuse_get(net, &udp_prot),
> - atomic_long_read(&udp_memory_allocated));
> + kcg_memory_allocated(&udp_prot, cg));
> seq_printf(seq, "UDPLITE: inuse %d\n",
> sock_prot_inuse_get(net, &udplite_prot));
> seq_printf(seq, "RAW: inuse %d\n",
> diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
> index 46febca..ca82b90 100644
> --- a/net/ipv4/tcp.c
> +++ b/net/ipv4/tcp.c
> @@ -291,13 +291,11 @@ EXPORT_SYMBOL(sysctl_tcp_rmem);
> EXPORT_SYMBOL(sysctl_tcp_wmem);
>
> atomic_long_t tcp_memory_allocated; /* Current allocated memory. */
> -EXPORT_SYMBOL(tcp_memory_allocated);
>
> /*
> * Current number of TCP sockets.
> */
> struct percpu_counter tcp_sockets_allocated;
> -EXPORT_SYMBOL(tcp_sockets_allocated);
>
> /*
> * TCP splice context
> @@ -315,7 +313,18 @@ struct tcp_splice_state {
> * is strict, actions are advisory and have some latency.
> */
> int tcp_memory_pressure __read_mostly;
> -EXPORT_SYMBOL(tcp_memory_pressure);
> +
> +int *memory_pressure_tcp(struct mem_cgroup *memcg)
> +{
> + return &tcp_memory_pressure;
> +}
> +EXPORT_SYMBOL(memory_pressure_tcp);
> +
> +struct percpu_counter *sockets_allocated_tcp(struct mem_cgroup *memcg)
> +{
> + return &tcp_sockets_allocated;
> +}
> +EXPORT_SYMBOL(sockets_allocated_tcp);
>
> void tcp_enter_memory_pressure(struct sock *sk)
> {
> @@ -326,6 +335,18 @@ void tcp_enter_memory_pressure(struct sock *sk)
> }
> EXPORT_SYMBOL(tcp_enter_memory_pressure);
>
> +long *tcp_sysctl_mem(struct mem_cgroup *memcg)
> +{
> + return sysctl_tcp_mem;
> +}
> +EXPORT_SYMBOL(tcp_sysctl_mem);
> +
> +atomic_long_t *memory_allocated_tcp(struct mem_cgroup *memcg)
> +{
> + return &tcp_memory_allocated;
> +}
> +EXPORT_SYMBOL(memory_allocated_tcp);
> +
> /* Convert seconds to retransmits based on initial and max timeout */
> static u8 secs_to_retrans(int seconds, int timeout, int rto_max)
> {
> diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
> index ea0d218..3f17423 100644
> --- a/net/ipv4/tcp_input.c
> +++ b/net/ipv4/tcp_input.c
> @@ -316,7 +316,7 @@ static void tcp_grow_window(struct sock *sk, struct sk_buff *skb)
> /* Check #1 */
> if (tp->rcv_ssthresh < tp->window_clamp &&
> (int)tp->rcv_ssthresh < tcp_space(sk) &&
> - !tcp_memory_pressure) {
> + !sk_memory_pressure(sk)) {
> int incr;
>
> /* Check #2. Increase window, if skb with such overhead
> @@ -398,8 +398,8 @@ static void tcp_clamp_window(struct sock *sk)
>
> if (sk->sk_rcvbuf < sysctl_tcp_rmem[2] &&
> !(sk->sk_userlocks & SOCK_RCVBUF_LOCK) &&
> - !tcp_memory_pressure &&
> - atomic_long_read(&tcp_memory_allocated) < sysctl_tcp_mem[0]) {
> + !sk_memory_pressure(sk) &&
> + sk_memory_allocated(sk) < sk_prot_mem(sk, 0)) {
> sk->sk_rcvbuf = min(atomic_read(&sk->sk_rmem_alloc),
> sysctl_tcp_rmem[2]);
> }
> @@ -4806,7 +4806,7 @@ static int tcp_prune_queue(struct sock *sk)
>
> if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
> tcp_clamp_window(sk);
> - else if (tcp_memory_pressure)
> + else if (sk_memory_pressure(sk))
> tp->rcv_ssthresh = min(tp->rcv_ssthresh, 4U * tp->advmss);
>
> tcp_collapse_ofo_queue(sk);
> @@ -4872,11 +4872,11 @@ static int tcp_should_expand_sndbuf(struct sock *sk)
> return 0;
>
> /* If we are under global TCP memory pressure, do not expand. */
> - if (tcp_memory_pressure)
> + if (sk_memory_pressure(sk))
> return 0;
>
> /* If we are under soft global TCP memory pressure, do not expand. */
> - if (atomic_long_read(&tcp_memory_allocated) >= sysctl_tcp_mem[0])
> + if (sk_memory_allocated(sk) >= sk_prot_mem(sk, 0))
> return 0;
>
> /* If we filled the congestion window, do not expand. */
> diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> index 1c12b8e..cbb0d5e 100644
> --- a/net/ipv4/tcp_ipv4.c
> +++ b/net/ipv4/tcp_ipv4.c
> @@ -1901,7 +1901,7 @@ static int tcp_v4_init_sock(struct sock *sk)
> sk->sk_rcvbuf = sysctl_tcp_rmem[1];
>
> local_bh_disable();
> - percpu_counter_inc(&tcp_sockets_allocated);
> + sk_sockets_allocated_inc(sk);
> local_bh_enable();
>
> return 0;
> @@ -1957,7 +1957,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
> tp->cookie_values = NULL;
> }
>
> - percpu_counter_dec(&tcp_sockets_allocated);
> + sk_sockets_allocated_dec(sk);
> }
> EXPORT_SYMBOL(tcp_v4_destroy_sock);
>
> @@ -2598,11 +2598,11 @@ struct proto tcp_prot = {
> .unhash = inet_unhash,
> .get_port = inet_csk_get_port,
> .enter_memory_pressure = tcp_enter_memory_pressure,
> - .sockets_allocated = &tcp_sockets_allocated,
> + .memory_pressure = memory_pressure_tcp,
> + .sockets_allocated = sockets_allocated_tcp,
> .orphan_count = &tcp_orphan_count,
> - .memory_allocated = &tcp_memory_allocated,
> - .memory_pressure = &tcp_memory_pressure,
> - .sysctl_mem = sysctl_tcp_mem,
> + .memory_allocated = memory_allocated_tcp,
> + .prot_mem = tcp_sysctl_mem,
> .sysctl_wmem = sysctl_tcp_wmem,
> .sysctl_rmem = sysctl_tcp_rmem,
> .max_header = MAX_TCP_HEADER,
> diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
> index 882e0b0..06aeb31 100644
> --- a/net/ipv4/tcp_output.c
> +++ b/net/ipv4/tcp_output.c
> @@ -1912,7 +1912,7 @@ u32 __tcp_select_window(struct sock *sk)
> if (free_space < (full_space >> 1)) {
> icsk->icsk_ack.quick = 0;
>
> - if (tcp_memory_pressure)
> + if (sk_memory_pressure(sk))
> tp->rcv_ssthresh = min(tp->rcv_ssthresh,
> 4U * tp->advmss);
>
> diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
> index ecd44b0..2c67617 100644
> --- a/net/ipv4/tcp_timer.c
> +++ b/net/ipv4/tcp_timer.c
> @@ -261,7 +261,7 @@ static void tcp_delack_timer(unsigned long data)
> }
>
> out:
> - if (tcp_memory_pressure)
> + if (sk_memory_pressure(sk))
> sk_mem_reclaim(sk);
> out_unlock:
> bh_unlock_sock(sk);
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> index 1b5a193..f8d72ce 100644
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -120,9 +120,6 @@ EXPORT_SYMBOL(sysctl_udp_rmem_min);
> int sysctl_udp_wmem_min __read_mostly;
> EXPORT_SYMBOL(sysctl_udp_wmem_min);
>
> -atomic_long_t udp_memory_allocated;
> -EXPORT_SYMBOL(udp_memory_allocated);
> -
> #define MAX_UDP_PORTS 65536
> #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN)
>
> @@ -1918,6 +1915,19 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
> }
> EXPORT_SYMBOL(udp_poll);
>
> +static atomic_long_t udp_memory_allocated;
> +atomic_long_t *memory_allocated_udp(struct mem_cgroup *memcg)
> +{
> + return &udp_memory_allocated;
> +}
> +EXPORT_SYMBOL(memory_allocated_udp);
> +
> +long *udp_sysctl_mem(struct mem_cgroup *memcg)
> +{
> + return sysctl_udp_mem;
> +}
> +EXPORT_SYMBOL(udp_sysctl_mem);
> +
> struct proto udp_prot = {
> .name = "UDP",
> .owner = THIS_MODULE,
> @@ -1936,8 +1946,8 @@ struct proto udp_prot = {
> .unhash = udp_lib_unhash,
> .rehash = udp_v4_rehash,
> .get_port = udp_v4_get_port,
> - .memory_allocated = &udp_memory_allocated,
> - .sysctl_mem = sysctl_udp_mem,
> + .memory_allocated = &memory_allocated_udp,
> + .prot_mem = udp_sysctl_mem,
> .sysctl_wmem = &sysctl_udp_wmem_min,
> .sysctl_rmem = &sysctl_udp_rmem_min,
> .obj_size = sizeof(struct udp_sock),
> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
> index d1fb63f..807797a 100644
> --- a/net/ipv6/tcp_ipv6.c
> +++ b/net/ipv6/tcp_ipv6.c
> @@ -2012,7 +2012,7 @@ static int tcp_v6_init_sock(struct sock *sk)
> sk->sk_rcvbuf = sysctl_tcp_rmem[1];
>
> local_bh_disable();
> - percpu_counter_inc(&tcp_sockets_allocated);
> + sk_sockets_allocated_inc(sk);
> local_bh_enable();
>
> return 0;
> @@ -2221,11 +2221,11 @@ struct proto tcpv6_prot = {
> .unhash = inet_unhash,
> .get_port = inet_csk_get_port,
> .enter_memory_pressure = tcp_enter_memory_pressure,
> - .sockets_allocated = &tcp_sockets_allocated,
> - .memory_allocated = &tcp_memory_allocated,
> - .memory_pressure = &tcp_memory_pressure,
> + .sockets_allocated = sockets_allocated_tcp,
> + .memory_allocated = memory_allocated_tcp,
> + .memory_pressure = memory_pressure_tcp,
> .orphan_count = &tcp_orphan_count,
> - .sysctl_mem = sysctl_tcp_mem,
> + .prot_mem = tcp_sysctl_mem,
> .sysctl_wmem = sysctl_tcp_wmem,
> .sysctl_rmem = sysctl_tcp_rmem,
> .max_header = MAX_TCP_HEADER,
> diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
> index 29213b5..ef4b5b3 100644
> --- a/net/ipv6/udp.c
> +++ b/net/ipv6/udp.c
> @@ -1465,8 +1465,8 @@ struct proto udpv6_prot = {
> .unhash = udp_lib_unhash,
> .rehash = udp_v6_rehash,
> .get_port = udp_v6_get_port,
> - .memory_allocated = &udp_memory_allocated,
> - .sysctl_mem = sysctl_udp_mem,
> + .memory_allocated = memory_allocated_udp,
> + .prot_mem = udp_sysctl_mem,
> .sysctl_wmem = &sysctl_udp_wmem_min,
> .sysctl_rmem = &sysctl_udp_rmem_min,
> .obj_size = sizeof(struct udp6_sock),
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 836aa63..62eb178 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -119,11 +119,30 @@ static int sctp_memory_pressure;
> static atomic_long_t sctp_memory_allocated;
> struct percpu_counter sctp_sockets_allocated;
>
> +static long *sctp_sysctl_mem(struct mem_cgroup *memcg)
> +{
> + return sysctl_sctp_mem;
> +}
> +
> static void sctp_enter_memory_pressure(struct sock *sk)
> {
> sctp_memory_pressure = 1;
> }
>
> +static int *memory_pressure_sctp(struct mem_cgroup *memcg)
> +{
> + return &sctp_memory_pressure;
> +}
> +
> +static atomic_long_t *memory_allocated_sctp(struct mem_cgroup *memcg)
> +{
> + return &sctp_memory_allocated;
> +}
> +
> +static struct percpu_counter *sockets_allocated_sctp(struct mem_cgroup *memcg)
> +{
> + return &sctp_sockets_allocated;
> +}
>
> /* Get the sndbuf space available at the time on the association. */
> static inline int sctp_wspace(struct sctp_association *asoc)
> @@ -6831,13 +6850,13 @@ struct proto sctp_prot = {
> .unhash = sctp_unhash,
> .get_port = sctp_get_port,
> .obj_size = sizeof(struct sctp_sock),
> - .sysctl_mem = sysctl_sctp_mem,
> + .prot_mem = sctp_sysctl_mem,
> .sysctl_rmem = sysctl_sctp_rmem,
> .sysctl_wmem = sysctl_sctp_wmem,
> - .memory_pressure = &sctp_memory_pressure,
> + .memory_pressure = memory_pressure_sctp,
> .enter_memory_pressure = sctp_enter_memory_pressure,
> - .memory_allocated = &sctp_memory_allocated,
> - .sockets_allocated = &sctp_sockets_allocated,
> + .memory_allocated = memory_allocated_sctp,
> + .sockets_allocated = sockets_allocated_sctp,
> };
>
> #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
> @@ -6863,12 +6882,12 @@ struct proto sctpv6_prot = {
> .unhash = sctp_unhash,
> .get_port = sctp_get_port,
> .obj_size = sizeof(struct sctp6_sock),
> - .sysctl_mem = sysctl_sctp_mem,
> + .prot_mem = sctp_sysctl_mem,
> .sysctl_rmem = sysctl_sctp_rmem,
> .sysctl_wmem = sysctl_sctp_wmem,
> - .memory_pressure = &sctp_memory_pressure,
> + .memory_pressure = memory_pressure_sctp,
> .enter_memory_pressure = sctp_enter_memory_pressure,
> - .memory_allocated = &sctp_memory_allocated,
> - .sockets_allocated = &sctp_sockets_allocated,
> + .memory_allocated = memory_allocated_sctp,
> + .sockets_allocated = sockets_allocated_sctp,
> };
> #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
> --
> 1.7.6
>
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller
2011-10-03 10:18 ` [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
2011-10-03 10:41 ` Kirill A. Shutemov
@ 2011-10-04 0:38 ` KAMEZAWA Hiroyuki
1 sibling, 0 replies; 34+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-04 0:38 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On Mon, 3 Oct 2011 14:18:36 +0400
Glauber Costa <glommer@parallels.com> wrote:
> This patch lays down the foundation for the kernel memory component
> of the Memory Controller.
>
> As of today, I am only laying down the following files:
>
> * memory.independent_kmem_limit
> * memory.kmem.limit_in_bytes (currently ignored)
> * memory.kmem.usage_in_bytes (always zero)
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: Paul Menage <paul@paulmenage.org>
> CC: Greg Thelen <gthelen@google.com>
> ---
> Documentation/cgroups/memory.txt | 30 +++++++++++-
> init/Kconfig | 11 ++++
> mm/memcontrol.c | 94 +++++++++++++++++++++++++++++++++++---
> 3 files changed, 126 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> index 6f3c598..6f1954a 100644
> --- a/Documentation/cgroups/memory.txt
> +++ b/Documentation/cgroups/memory.txt
> @@ -44,8 +44,9 @@ Features:
> - oom-killer disable knob and oom-notifier
> - Root cgroup has no limit controls.
>
> - Kernel memory and Hugepages are not under control yet. We just manage
> - pages on LRU. To add more controls, we have to take care of performance.
> + Hugepages is not under control yet. We just manage pages on LRU. To add more
> + controls, we have to take care of performance. Kernel memory support is work
> + in progress, and the current version provides basically functionality.
>
> Brief summary of control files.
>
> @@ -56,8 +57,11 @@ Brief summary of control files.
> (See 5.5 for details)
> memory.memsw.usage_in_bytes # show current res_counter usage for memory+Swap
> (See 5.5 for details)
> + memory.kmem.usage_in_bytes # show current res_counter usage for kmem only.
> + (See 2.7 for details)
> memory.limit_in_bytes # set/show limit of memory usage
> memory.memsw.limit_in_bytes # set/show limit of memory+Swap usage
> + memory.kmem.limit_in_bytes # if allowed, set/show limit of kernel memory
> memory.failcnt # show the number of memory usage hits limits
> memory.memsw.failcnt # show the number of memory+Swap hits limits
> memory.max_usage_in_bytes # show max memory usage recorded
> @@ -72,6 +76,9 @@ Brief summary of control files.
> memory.oom_control # set/show oom controls.
> memory.numa_stat # show the number of memory usage per numa node
>
> + memory.independent_kmem_limit # select whether or not kernel memory limits are
> + independent of user limits
> +
> 1. History
>
> The memory controller has a long history. A request for comments for the memory
> @@ -255,6 +262,25 @@ When oom event notifier is registered, event will be delivered.
> per-zone-per-cgroup LRU (cgroup's private LRU) is just guarded by
> zone->lru_lock, it has no lock of its own.
>
> +2.7 Kernel Memory Extension (CONFIG_CGROUP_MEM_RES_CTLR_KMEM)
> +
> + With the Kernel memory extension, the Memory Controller is able to limit
> +the amount of kernel memory used by the system. Kernel memory is fundamentally
> +different than user memory, since it can't be swapped out, which makes it
> +possible to DoS the system by consuming too much of this precious resource.
> +Kernel memory limits are not imposed for the root cgroup.
> +
> +Memory limits as specified by the standard Memory Controller may or may not
> +take kernel memory into consideration. This is achieved through the file
> +memory.independent_kmem_limit. A Value different than 0 will allow for kernel
> +memory to be controlled separately.
> +
> +When kernel memory limits are not independent, the limit values set in
> +memory.kmem files are ignored.
> +
> +Currently no soft limit is implemented for kernel memory. It is future work
> +to trigger slab reclaim when those limits are reached.
> +
Please add some CAUTION like
==
"CAUTION: the kmem extetion prevents tasks from moving among cgroups.
If a task has kmem accounting in a cgroup, the task cannot be moved
until the kmem resource is released. And more, until the resource is
fully released, the cgroup cannot be destroyed. So, please consider
your use cases and set kmem extention config carefully".
==
And add some memo to KCONFIG. This should be warned.
> +config CGROUP_MEM_RES_CTLR_KMEM
> + bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
> + depends on CGROUP_MEM_RES_CTLR && EXPERIMENTAL
> + default y
default must be n until you fixes the bug.
Thanks,
-Kame
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 2/8] socket: initial cgroup code.
2011-10-03 10:18 ` [PATCH v4 2/8] socket: initial cgroup code Glauber Costa
2011-10-03 10:47 ` Kirill A. Shutemov
@ 2011-10-04 0:41 ` KAMEZAWA Hiroyuki
1 sibling, 0 replies; 34+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-04 0:41 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On Mon, 3 Oct 2011 14:18:37 +0400
Glauber Costa <glommer@parallels.com> wrote:
> We aim to control the amount of kernel memory pinned at any
> time by tcp sockets. To lay the foundations for this work,
> this patch adds a pointer to the kmem_cgroup to the socket
> structure.
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtsu.com>
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling.
2011-10-03 10:18 ` [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
2011-10-03 15:13 ` Andrew Vagin
@ 2011-10-04 0:57 ` KAMEZAWA Hiroyuki
2011-10-04 6:32 ` Glauber Costa
2011-10-04 7:13 ` Glauber Costa
1 sibling, 2 replies; 34+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-04 0:57 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On Mon, 3 Oct 2011 14:18:38 +0400
Glauber Costa <glommer@parallels.com> wrote:
> This patch converts struct sock fields memory_pressure,
> memory_allocated, sockets_allocated, and sysctl_mem (now prot_mem)
> to function pointers, receiving a struct mem_cgroup parameter.
>
> enter_memory_pressure is kept the same, since all its callers
> have socket a context, and the kmem_cgroup can be derived from
> the socket itself.
>
> To keep things working, the patch convert all users of those fields
> to use acessor functions.
>
> In my benchmarks I didn't see a significant performance difference
> with this patch applied compared to a baseline (around 1 % diff, thus
> inside error margin).
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.com>
A nitpick.
> #ifdef CONFIG_INET
> struct sock;
> +struct proto;
> #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
> void sock_update_memcg(struct sock *sk);
> void sock_release_memcg(struct sock *sk);
> -
> +void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
> + int amt, int *parent_failure);
> +void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt);
> +void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot);
> +void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot);
> #else
> +/* memcontrol includes sockets.h, that includes memcontrol.h ... */
> +static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
> + struct proto *prot, int amt,
> + int *parent_failure)
> +{
> +}
In these days, at naming memory cgroup pointers, we use "memcg" instead of
"mem". So, could you use "memcg" for represeinting memory cgroup ?
> +
> +void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
> + int amt, int *parent_failure)
> +{
> + mem = parent_mem_cgroup(mem);
> + for (; mem != NULL; mem = parent_mem_cgroup(mem)) {
> + long alloc;
> + long *prot_mem = prot->prot_mem(mem);
> + /*
> + * Large nestings are not the common case, and stopping in the
> + * middle would be complicated enough, that we bill it all the
> + * way through the root, and if needed, unbill everything later
> + */
> + alloc = atomic_long_add_return(amt,
> + prot->memory_allocated(mem));
> + *parent_failure |= (alloc > prot_mem[2]);
> + }
> +}
> +EXPORT_SYMBOL(memcg_sock_mem_alloc);
Hmm. why not using res_counter ? for reusing 'unbill' code ?
Thanks,
-Kame
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 4/8] per-cgroup tcp buffers control
2011-10-03 10:18 ` [PATCH v4 4/8] per-cgroup tcp buffers control Glauber Costa
@ 2011-10-04 1:16 ` KAMEZAWA Hiroyuki
2011-10-04 5:43 ` Glauber Costa
0 siblings, 1 reply; 34+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-04 1:16 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On Mon, 3 Oct 2011 14:18:39 +0400
Glauber Costa <glommer@parallels.com> wrote:
> With all the infrastructure in place, this patch implements
> per-cgroup control for tcp memory pressure handling.
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtisu.com>
One question.
> +void tcp_enter_memory_pressure(struct sock *sk)
> +{
> + struct mem_cgroup *memcg = sk->sk_cgrp;
> + if (!memcg->tcp.tcp_memory_pressure) {
> + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES);
> + memcg->tcp.tcp_memory_pressure = 1;
> + }
> +}
It seems memcg->tcp.tcp_memory_pressure has no locks and not atomic.
no problematic race ?
Thanks,
-Kame
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 5/8] per-netns ipv4 sysctl_tcp_mem
2011-10-03 10:18 ` [PATCH v4 5/8] per-netns ipv4 sysctl_tcp_mem Glauber Costa
@ 2011-10-04 1:18 ` KAMEZAWA Hiroyuki
0 siblings, 0 replies; 34+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-04 1:18 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On Mon, 3 Oct 2011 14:18:40 +0400
Glauber Costa <glommer@parallels.com> wrote:
> This patch allows each namespace to independently set up
> its levels for tcp memory pressure thresholds. This patch
> alone does not buy much: we need to make this values
> per group of process somehow. This is achieved in the
> patches that follows in this patchset.
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 6/8] tcp buffer limitation: per-cgroup limit
2011-10-03 10:18 ` [PATCH v4 6/8] tcp buffer limitation: per-cgroup limit Glauber Costa
@ 2011-10-04 1:21 ` KAMEZAWA Hiroyuki
2011-10-04 6:22 ` Glauber Costa
0 siblings, 1 reply; 34+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-04 1:21 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On Mon, 3 Oct 2011 14:18:41 +0400
Glauber Costa <glommer@parallels.com> wrote:
> This patch uses the "tcp_max_mem" field of the kmem_cgroup to
> effectively control the amount of kernel memory pinned by a cgroup.
>
> We have to make sure that none of the memory pressure thresholds
> specified in the namespace are bigger than the current cgroup.
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> CC: David S. Miller <davem@davemloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
> CC: Eric W. Biederman <ebiederm@xmission.com>
> ---
> Documentation/cgroups/memory.txt | 1 +
> include/linux/memcontrol.h | 10 +++++
> include/net/tcp.h | 1 +
> mm/memcontrol.c | 76 +++++++++++++++++++++++++++++++++++---
> net/ipv4/sysctl_net_ipv4.c | 20 ++++++++++
> 5 files changed, 102 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> index 6f1954a..1ffde3e 100644
> --- a/Documentation/cgroups/memory.txt
> +++ b/Documentation/cgroups/memory.txt
> @@ -78,6 +78,7 @@ Brief summary of control files.
>
> memory.independent_kmem_limit # select whether or not kernel memory limits are
> independent of user limits
> + memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
>
What is the releationship between tcp.max_memory and kmem_limit ?
tcp.max_memory < kmem_limit ?
usage of tcp memory is included in kmem usage ?
Thanks,
-Kame
--
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 4/8] per-cgroup tcp buffers control
2011-10-04 1:16 ` KAMEZAWA Hiroyuki
@ 2011-10-04 5:43 ` Glauber Costa
0 siblings, 0 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-04 5:43 UTC (permalink / raw)
To: KAMEZAWA Hiroyuki
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On 10/04/2011 05:16 AM, KAMEZAWA Hiroyuki wrote:
> It seems memcg->tcp.tcp_memory_pressure has no locks and not atomic.
>
> no problematic race ?
>
> Thanks,
> -Kame
Well,
prior to this patch, it was a global variable. And nobody complained so
far...
My impression is that the only thing that really needs to be atomic is
the memory accounting, which is already. If we miss a memory pressure
condition entry, we'll get to it next time.
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 6/8] tcp buffer limitation: per-cgroup limit
2011-10-04 1:21 ` KAMEZAWA Hiroyuki
@ 2011-10-04 6:22 ` Glauber Costa
0 siblings, 0 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-04 6:22 UTC (permalink / raw)
To: KAMEZAWA Hiroyuki
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On 10/04/2011 05:21 AM, KAMEZAWA Hiroyuki wrote:
> On Mon, 3 Oct 2011 14:18:41 +0400
> Glauber Costa<glommer@parallels.com> wrote:
>
>> This patch uses the "tcp_max_mem" field of the kmem_cgroup to
>> effectively control the amount of kernel memory pinned by a cgroup.
>>
>> We have to make sure that none of the memory pressure thresholds
>> specified in the namespace are bigger than the current cgroup.
>>
>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>> CC: David S. Miller<davem@davemloft.net>
>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>> CC: Eric W. Biederman<ebiederm@xmission.com>
>> ---
>> Documentation/cgroups/memory.txt | 1 +
>> include/linux/memcontrol.h | 10 +++++
>> include/net/tcp.h | 1 +
>> mm/memcontrol.c | 76 +++++++++++++++++++++++++++++++++++---
>> net/ipv4/sysctl_net_ipv4.c | 20 ++++++++++
>> 5 files changed, 102 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
>> index 6f1954a..1ffde3e 100644
>> --- a/Documentation/cgroups/memory.txt
>> +++ b/Documentation/cgroups/memory.txt
>> @@ -78,6 +78,7 @@ Brief summary of control files.
>>
>> memory.independent_kmem_limit # select whether or not kernel memory limits are
>> independent of user limits
>> + memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
>>
>
> What is the releationship between tcp.max_memory and kmem_limit ?
Quite loose.
> tcp.max_memory< kmem_limit ?
> usage of tcp memory is included in kmem usage ?
tcp.max_memory is < kmem_limit, for it to be meaningful. But I don't
think we need to force that. I may want to start with a high value for
tcp_max_memory and low on kmem_limit, and raise it later.
So here is how it goes:
Memory is allocated from the slab, and then it's usage is independently
controlled by the network-specific memory pressure conditions until it
is reclaimed.
Memory allocation can succeed, but then fail to be assigned to the
socket due to memory pressure.
Since we more or less agree that on accounting the slab according to
Greg's idea, I am not concerning myself with the actual accounting here,
since it will come for free when we account the slab.
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling.
2011-10-04 0:57 ` KAMEZAWA Hiroyuki
@ 2011-10-04 6:32 ` Glauber Costa
2011-10-04 7:13 ` Glauber Costa
1 sibling, 0 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-04 6:32 UTC (permalink / raw)
To: KAMEZAWA Hiroyuki
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On 10/04/2011 04:57 AM, KAMEZAWA Hiroyuki wrote:
> On Mon, 3 Oct 2011 14:18:38 +0400
> Glauber Costa<glommer@parallels.com> wrote:
>
>> This patch converts struct sock fields memory_pressure,
>> memory_allocated, sockets_allocated, and sysctl_mem (now prot_mem)
>> to function pointers, receiving a struct mem_cgroup parameter.
>>
>> enter_memory_pressure is kept the same, since all its callers
>> have socket a context, and the kmem_cgroup can be derived from
>> the socket itself.
>>
>> To keep things working, the patch convert all users of those fields
>> to use acessor functions.
>>
>> In my benchmarks I didn't see a significant performance difference
>> with this patch applied compared to a baseline (around 1 % diff, thus
>> inside error margin).
>>
>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>> CC: David S. Miller<davem@davemloft.net>
>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>> CC: Eric W. Biederman<ebiederm@xmission.com>
>
> A nitpick.
>
>
>> #ifdef CONFIG_INET
>> struct sock;
>> +struct proto;
>> #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
>> void sock_update_memcg(struct sock *sk);
>> void sock_release_memcg(struct sock *sk);
>> -
>> +void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
>> + int amt, int *parent_failure);
>> +void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt);
>> +void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot);
>> +void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot);
>> #else
>> +/* memcontrol includes sockets.h, that includes memcontrol.h ... */
>> +static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
>> + struct proto *prot, int amt,
>> + int *parent_failure)
>> +{
>> +}
>
> In these days, at naming memory cgroup pointers, we use "memcg" instead of
> "mem". So, could you use "memcg" for represeinting memory cgroup ?
>
>
>> +
>> +void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
>> + int amt, int *parent_failure)
>> +{
>> + mem = parent_mem_cgroup(mem);
>> + for (; mem != NULL; mem = parent_mem_cgroup(mem)) {
>> + long alloc;
>> + long *prot_mem = prot->prot_mem(mem);
>> + /*
>> + * Large nestings are not the common case, and stopping in the
>> + * middle would be complicated enough, that we bill it all the
>> + * way through the root, and if needed, unbill everything later
>> + */
>> + alloc = atomic_long_add_return(amt,
>> + prot->memory_allocated(mem));
>> + *parent_failure |= (alloc> prot_mem[2]);
>> + }
>> +}
>> +EXPORT_SYMBOL(memcg_sock_mem_alloc);
>
> Hmm. why not using res_counter ? for reusing 'unbill' code ?
>
Well,
res_counters are slightly more expensive than needed here, since we need
to clear interrupts and hold a spinlock. No particular reason besides it.
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* Re: [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling.
2011-10-04 0:57 ` KAMEZAWA Hiroyuki
2011-10-04 6:32 ` Glauber Costa
@ 2011-10-04 7:13 ` Glauber Costa
1 sibling, 0 replies; 34+ messages in thread
From: Glauber Costa @ 2011-10-04 7:13 UTC (permalink / raw)
To: KAMEZAWA Hiroyuki
Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
linux-mm, kirill, avagin
On 10/04/2011 04:57 AM, KAMEZAWA Hiroyuki wrote:
> On Mon, 3 Oct 2011 14:18:38 +0400
> Glauber Costa<glommer@parallels.com> wrote:
>
>> This patch converts struct sock fields memory_pressure,
>> memory_allocated, sockets_allocated, and sysctl_mem (now prot_mem)
>> to function pointers, receiving a struct mem_cgroup parameter.
>>
>> enter_memory_pressure is kept the same, since all its callers
>> have socket a context, and the kmem_cgroup can be derived from
>> the socket itself.
>>
>> To keep things working, the patch convert all users of those fields
>> to use acessor functions.
>>
>> In my benchmarks I didn't see a significant performance difference
>> with this patch applied compared to a baseline (around 1 % diff, thus
>> inside error margin).
>>
>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>> CC: David S. Miller<davem@davemloft.net>
>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>> CC: Eric W. Biederman<ebiederm@xmission.com>
>
> A nitpick.
>
>
>> #ifdef CONFIG_INET
>> struct sock;
>> +struct proto;
>> #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
>> void sock_update_memcg(struct sock *sk);
>> void sock_release_memcg(struct sock *sk);
>> -
>> +void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
>> + int amt, int *parent_failure);
>> +void memcg_sock_mem_free(struct mem_cgroup *mem, struct proto *prot, int amt);
>> +void memcg_sockets_allocated_dec(struct mem_cgroup *mem, struct proto *prot);
>> +void memcg_sockets_allocated_inc(struct mem_cgroup *mem, struct proto *prot);
>> #else
>> +/* memcontrol includes sockets.h, that includes memcontrol.h ... */
>> +static inline void memcg_sock_mem_alloc(struct mem_cgroup *mem,
>> + struct proto *prot, int amt,
>> + int *parent_failure)
>> +{
>> +}
>
> In these days, at naming memory cgroup pointers, we use "memcg" instead of
> "mem". So, could you use "memcg" for represeinting memory cgroup ?
>
>
>> +
>> +void memcg_sock_mem_alloc(struct mem_cgroup *mem, struct proto *prot,
>> + int amt, int *parent_failure)
>> +{
>> + mem = parent_mem_cgroup(mem);
>> + for (; mem != NULL; mem = parent_mem_cgroup(mem)) {
>> + long alloc;
>> + long *prot_mem = prot->prot_mem(mem);
>> + /*
>> + * Large nestings are not the common case, and stopping in the
>> + * middle would be complicated enough, that we bill it all the
>> + * way through the root, and if needed, unbill everything later
>> + */
>> + alloc = atomic_long_add_return(amt,
>> + prot->memory_allocated(mem));
>> + *parent_failure |= (alloc> prot_mem[2]);
>> + }
>> +}
>> +EXPORT_SYMBOL(memcg_sock_mem_alloc);
>
> Hmm. why not using res_counter ? for reusing 'unbill' code ?
>
> Thanks,
> -Kame
>
Well, besides the cost, we'd have atomic_t for !cgroups, and res_counter
for cgroups. I think there is value in keeping them the same.
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup
2011-10-03 12:36 ` Kirill A. Shutemov
2011-10-03 12:36 ` Glauber Costa
@ 2011-10-04 9:10 ` Glauber Costa
2011-10-06 8:46 ` Kirill A. Shutemov
1 sibling, 1 reply; 34+ messages in thread
From: Glauber Costa @ 2011-10-04 9:10 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On 10/03/2011 04:36 PM, Kirill A. Shutemov wrote:
> On Mon, Oct 03, 2011 at 04:26:41PM +0400, Glauber Costa wrote:
>> On 10/03/2011 04:25 PM, Kirill A. Shutemov wrote:
>>> On Mon, Oct 03, 2011 at 04:19:18PM +0400, Glauber Costa wrote:
>>>> On 10/03/2011 04:14 PM, Kirill A. Shutemov wrote:
>>>>> On Mon, Oct 03, 2011 at 02:18:42PM +0400, Glauber Costa wrote:
>>>>>> This patch introduces kmem.tcp_current_memory file, living in the
>>>>>> kmem_cgroup filesystem. It is a simple read-only file that displays the
>>>>>> amount of kernel memory currently consumed by the cgroup.
>>>>>>
>>>>>> Signed-off-by: Glauber Costa<glommer@parallels.com>
>>>>>> CC: David S. Miller<davem@davemloft.net>
>>>>>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
>>>>>> CC: Eric W. Biederman<ebiederm@xmission.com>
>>>>>> ---
>>>>>> Documentation/cgroups/memory.txt | 1 +
>>>>>> mm/memcontrol.c | 11 +++++++++++
>>>>>> 2 files changed, 12 insertions(+), 0 deletions(-)
>>>>>>
>>>>>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
>>>>>> index 1ffde3e..f5a539d 100644
>>>>>> --- a/Documentation/cgroups/memory.txt
>>>>>> +++ b/Documentation/cgroups/memory.txt
>>>>>> @@ -79,6 +79,7 @@ Brief summary of control files.
>>>>>> memory.independent_kmem_limit # select whether or not kernel memory limits are
>>>>>> independent of user limits
>>>>>> memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
>>>>>> + memory.kmem.tcp.current_memory # show current tcp buf memory allocation
>>>>>
>>>>> Both are in pages, right?
>>>>> Shouldn't it be scaled to bytes and named uniform with other memcg file?
>>>>> memory.kmem.tcp.limit_in_bytes/usage_in_bytes.
>>>>>
>>>> You are absolutely correct.
>>>> Since the internal tcp comparison works, I just ended up never noticing
>>>> this.
>>>
>>> Should we have failcnt and max_usage_in_bytes for tcp as well?
>>>
>>
>> Well, we get a fail count from the tracer anyway, so I don't really see
>> a need for that. I see value in having it for the slab allocation
>> itself, but since this only controls the memory pressure framework, I
>> think we can live without it.
>>
>> That said, this is not a strong opinion. I can add it if you'd prefer.
>
> It's good for userspace to have the same set of files for all domains:
> - memory;
> - memory.memsw;
> - memory.kmem;
> - memory.kmem.tcp;
> - etc.
> Userspace can reuse code for handling them in this case.
>
Ok. Back on this.
Not all domains have all files anyway.
max_usage seems to be a property of the main memcg, not of its domains.
failcnt is present on memsw, and on that only. The problem here, is that
this can fail ( and usually will ) in codepaths outside the memory
controller. (see net/core/sock.c:__sk_mem_schedule)
Also, max_usage makes sense for kernel memory as a whole, but I don't
think it makes sense here as we're only controlling a specific pressure
condition.
So in a nutshell: I'd like to leave this alone, and add
kmem.max_usage_in_bytes and kmem.failcnt to the to soon-to-land-here
slab accounting patches. (Where the actual allocation happens)
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^ permalink raw reply [flat|nested] 34+ messages in thread
* Re: [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup
2011-10-04 9:10 ` Glauber Costa
@ 2011-10-06 8:46 ` Kirill A. Shutemov
0 siblings, 0 replies; 34+ messages in thread
From: Kirill A. Shutemov @ 2011-10-06 8:46 UTC (permalink / raw)
To: Glauber Costa
Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
gthelen, netdev, linux-mm, avagin
On Tue, Oct 04, 2011 at 01:10:06PM +0400, Glauber Costa wrote:
> On 10/03/2011 04:36 PM, Kirill A. Shutemov wrote:
> > On Mon, Oct 03, 2011 at 04:26:41PM +0400, Glauber Costa wrote:
> >> On 10/03/2011 04:25 PM, Kirill A. Shutemov wrote:
> >>> On Mon, Oct 03, 2011 at 04:19:18PM +0400, Glauber Costa wrote:
> >>>> On 10/03/2011 04:14 PM, Kirill A. Shutemov wrote:
> >>>>> On Mon, Oct 03, 2011 at 02:18:42PM +0400, Glauber Costa wrote:
> >>>>>> This patch introduces kmem.tcp_current_memory file, living in the
> >>>>>> kmem_cgroup filesystem. It is a simple read-only file that displays the
> >>>>>> amount of kernel memory currently consumed by the cgroup.
> >>>>>>
> >>>>>> Signed-off-by: Glauber Costa<glommer@parallels.com>
> >>>>>> CC: David S. Miller<davem@davemloft.net>
> >>>>>> CC: Hiroyouki Kamezawa<kamezawa.hiroyu@jp.fujitsu.com>
> >>>>>> CC: Eric W. Biederman<ebiederm@xmission.com>
> >>>>>> ---
> >>>>>> Documentation/cgroups/memory.txt | 1 +
> >>>>>> mm/memcontrol.c | 11 +++++++++++
> >>>>>> 2 files changed, 12 insertions(+), 0 deletions(-)
> >>>>>>
> >>>>>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> >>>>>> index 1ffde3e..f5a539d 100644
> >>>>>> --- a/Documentation/cgroups/memory.txt
> >>>>>> +++ b/Documentation/cgroups/memory.txt
> >>>>>> @@ -79,6 +79,7 @@ Brief summary of control files.
> >>>>>> memory.independent_kmem_limit # select whether or not kernel memory limits are
> >>>>>> independent of user limits
> >>>>>> memory.kmem.tcp.max_memory # set/show hard limit for tcp buf memory
> >>>>>> + memory.kmem.tcp.current_memory # show current tcp buf memory allocation
> >>>>>
> >>>>> Both are in pages, right?
> >>>>> Shouldn't it be scaled to bytes and named uniform with other memcg file?
> >>>>> memory.kmem.tcp.limit_in_bytes/usage_in_bytes.
> >>>>>
> >>>> You are absolutely correct.
> >>>> Since the internal tcp comparison works, I just ended up never noticing
> >>>> this.
> >>>
> >>> Should we have failcnt and max_usage_in_bytes for tcp as well?
> >>>
> >>
> >> Well, we get a fail count from the tracer anyway, so I don't really see
> >> a need for that. I see value in having it for the slab allocation
> >> itself, but since this only controls the memory pressure framework, I
> >> think we can live without it.
> >>
> >> That said, this is not a strong opinion. I can add it if you'd prefer.
> >
> > It's good for userspace to have the same set of files for all domains:
> > - memory;
> > - memory.memsw;
> > - memory.kmem;
> > - memory.kmem.tcp;
> > - etc.
> > Userspace can reuse code for handling them in this case.
> >
> Ok. Back on this.
>
> Not all domains have all files anyway.
$ ls -l *.{failcnt,limit_in_bytes,max_usage_in_bytes,usage_in_bytes}
-rw-r--r-- 1 root root 0 Oct 6 11:34 memory.failcnt
-rw-r--r-- 1 root root 0 Oct 6 11:34 memory.limit_in_bytes
-rw-r--r-- 1 root root 0 Oct 6 11:34 memory.max_usage_in_bytes
-rw-r--r-- 1 root root 0 Oct 6 11:34 memory.memsw.failcnt
-rw-r--r-- 1 root root 0 Oct 6 11:34 memory.memsw.limit_in_bytes
-rw-r--r-- 1 root root 0 Oct 6 11:34 memory.memsw.max_usage_in_bytes
-r--r--r-- 1 root root 0 Oct 6 11:34 memory.memsw.usage_in_bytes
-r--r--r-- 1 root root 0 Oct 6 11:34 memory.usage_in_bytes
Hm?..
> max_usage seems to be a property of the main memcg, not of its domains.
> failcnt is present on memsw, and on that only. The problem here, is that
> this can fail ( and usually will ) in codepaths outside the memory
> controller. (see net/core/sock.c:__sk_mem_schedule)
+1 reason to use res_counter. It provides all data needed for this files.
> Also, max_usage makes sense for kernel memory as a whole, but I don't
> think it makes sense here as we're only controlling a specific pressure
> condition.
max_usage is reasonable for everything you can limit. It allows you to
track if limit is set appropriate.
--
Kirill A. Shutemov
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^ permalink raw reply [flat|nested] 34+ messages in thread
end of thread, other threads:[~2011-10-06 8:46 UTC | newest]
Thread overview: 34+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-10-03 10:18 [PATCH v4 0/8] per-cgroup tcp buffer pressure settings Glauber Costa
2011-10-03 10:18 ` [PATCH v4 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
2011-10-03 10:41 ` Kirill A. Shutemov
2011-10-03 10:41 ` Glauber Costa
2011-10-04 0:38 ` KAMEZAWA Hiroyuki
2011-10-03 10:18 ` [PATCH v4 2/8] socket: initial cgroup code Glauber Costa
2011-10-03 10:47 ` Kirill A. Shutemov
2011-10-03 10:48 ` Glauber Costa
2011-10-03 11:02 ` Kirill A. Shutemov
2011-10-03 11:03 ` Glauber Costa
2011-10-04 0:41 ` KAMEZAWA Hiroyuki
2011-10-03 10:18 ` [PATCH v4 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
2011-10-03 15:13 ` Andrew Vagin
2011-10-04 0:57 ` KAMEZAWA Hiroyuki
2011-10-04 6:32 ` Glauber Costa
2011-10-04 7:13 ` Glauber Costa
2011-10-03 10:18 ` [PATCH v4 4/8] per-cgroup tcp buffers control Glauber Costa
2011-10-04 1:16 ` KAMEZAWA Hiroyuki
2011-10-04 5:43 ` Glauber Costa
2011-10-03 10:18 ` [PATCH v4 5/8] per-netns ipv4 sysctl_tcp_mem Glauber Costa
2011-10-04 1:18 ` KAMEZAWA Hiroyuki
2011-10-03 10:18 ` [PATCH v4 6/8] tcp buffer limitation: per-cgroup limit Glauber Costa
2011-10-04 1:21 ` KAMEZAWA Hiroyuki
2011-10-04 6:22 ` Glauber Costa
2011-10-03 10:18 ` [PATCH v4 7/8] Display current tcp memory allocation in kmem cgroup Glauber Costa
2011-10-03 12:14 ` Kirill A. Shutemov
2011-10-03 12:19 ` Glauber Costa
2011-10-03 12:25 ` Kirill A. Shutemov
2011-10-03 12:26 ` Glauber Costa
2011-10-03 12:36 ` Kirill A. Shutemov
2011-10-03 12:36 ` Glauber Costa
2011-10-04 9:10 ` Glauber Costa
2011-10-06 8:46 ` Kirill A. Shutemov
2011-10-03 10:18 ` [PATCH v4 8/8] Disable task moving when using kernel memory accounting Glauber Costa
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