[PATCH v6 0/8] per-cgroup tcp memory pressure handling

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* [PATCH v6 0/8] per-cgroup tcp memory pressure handling
@ 2011-10-10 10:24 Glauber Costa
  2011-10-10 10:24 ` [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
                   ` (7 more replies)
  0 siblings, 8 replies; 18+ messages in thread
From: Glauber Costa @ 2011-10-10 10:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel

Hi Guys,

I hope we have it all sorted this time. Main differences from
v5:
 * using res_counters for tcp_memory_allocated
 * tried to get maximum consistency with the rest of memcg files
   Now files appear even in root memcg, but we can't set any limits
   on it. (comes more or less for free with re-use of the files)
 * softlimit and failcnt are not shown, but I intend to introduce them
   in a followup series (failcnt is easy, but softlimit may need some more
   network-side work, at least testing)

I will be happy to address any comments you may have.

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 |   38 ++++-
 crypto/af_alg.c                  |    8 +-
 include/linux/memcontrol.h       |   49 +++++
 include/net/netns/ipv4.h         |    1 +
 include/net/sock.h               |  130 +++++++++++++-
 include/net/tcp.h                |   30 +++-
 include/net/udp.h                |    4 +-
 include/trace/events/sock.h      |   10 +-
 init/Kconfig                     |   14 ++
 mm/memcontrol.c                  |  375 ++++++++++++++++++++++++++++++++++++--
 net/core/sock.c                  |  104 ++++++++---
 net/decnet/af_decnet.c           |   22 ++-
 net/ipv4/proc.c                  |    7 +-
 net/ipv4/sysctl_net_ipv4.c       |   71 +++++++-
 net/ipv4/tcp.c                   |   60 ++++---
 net/ipv4/tcp_input.c             |   12 +-
 net/ipv4/tcp_ipv4.c              |   23 ++-
 net/ipv4/tcp_output.c            |    2 +-
 net/ipv4/tcp_timer.c             |    2 +-
 net/ipv4/udp.c                   |   21 ++-
 net/ipv6/tcp_ipv6.c              |   20 ++-
 net/ipv6/udp.c                   |    4 +-
 net/sctp/socket.c                |   37 +++-
 23 files changed, 912 insertions(+), 132 deletions(-)

-- 
1.7.6.4

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* [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller
  2011-10-10 10:24 [PATCH v6 0/8] per-cgroup tcp memory pressure handling Glauber Costa
@ 2011-10-10 10:24 ` Glauber Costa
  2011-10-13  5:44   ` KAMEZAWA Hiroyuki
  2011-10-13  7:18   ` Greg Thelen
  2011-10-10 10:24 ` [PATCH v6 2/8] socket: initial cgroup code Glauber Costa
                   ` (6 subsequent siblings)
  7 siblings, 2 replies; 18+ messages in thread
From: Glauber Costa @ 2011-10-10 10:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel, 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>
Reviewed-by: Kirill A. Shutemov <kirill@shutemov.name>
CC: Paul Menage <paul@paulmenage.org>
CC: Greg Thelen <gthelen@google.com>
---
 Documentation/cgroups/memory.txt |   36 ++++++++++++++-
 init/Kconfig                     |   14 ++++++
 mm/memcontrol.c                  |   91 +++++++++++++++++++++++++++++++++++--
 3 files changed, 134 insertions(+), 7 deletions(-)

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index 06eb6d9..bf00cd2 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 +262,31 @@ 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.
+
+CAUTION: As of this writing, the kmem extention may prevent 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. Also, until the resource is fully
+released, the cgroup cannot be destroyed. So, please consider your use cases
+and set kmem extention config option carefully.
+
 3. User Interface
 
 0. Configuration
diff --git a/init/Kconfig b/init/Kconfig
index d627783..b62b9e0 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -689,6 +689,20 @@ 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 n
+	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.
+
+	  WARNING: The current experimental implementation does not allow a
+	  task to move among different cgroups with a kmem resource being held.
 
 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 3508777..d25c5cb 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -226,6 +226,10 @@ 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.
 	 */
@@ -276,6 +280,11 @@ 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;
@@ -343,9 +352,14 @@ 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)
@@ -3837,10 +3851,15 @@ 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);
@@ -3873,6 +3892,10 @@ 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;
@@ -4603,6 +4626,22 @@ static int mem_control_numa_stat_open(struct inode *unused, struct file *file)
 }
 #endif /* CONFIG_NUMA */
 
+#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[] = {
 	{
 		.name = "usage_in_bytes",
@@ -4718,6 +4757,42 @@ 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)
+{
+	int ret = 0;
+
+	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;
@@ -4916,6 +4991,7 @@ 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.
@@ -4926,6 +5002,7 @@ 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;
@@ -4969,6 +5046,10 @@ 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;
 }
 
-- 
1.7.6.4

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^ permalink raw reply related	[flat|nested] 18+ messages in thread

* Re: [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller
  2011-10-10 10:24 ` [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
@ 2011-10-13  5:44   ` KAMEZAWA Hiroyuki
  2011-10-13  7:18   ` Greg Thelen
  1 sibling, 0 replies; 18+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-13  5:44 UTC (permalink / raw)
  To: Glauber Costa
  Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel

On Mon, 10 Oct 2011 14:24:21 +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>
> Reviewed-by: Kirill A. Shutemov <kirill@shutemov.name>
> CC: Paul Menage <paul@paulmenage.org>
> CC: Greg Thelen <gthelen@google.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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^ permalink raw reply	[flat|nested] 18+ messages in thread

* Re: [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller
  2011-10-10 10:24 ` [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
  2011-10-13  5:44   ` KAMEZAWA Hiroyuki
@ 2011-10-13  7:18   ` Greg Thelen
  2011-10-13  8:19     ` Glauber Costa
  1 sibling, 1 reply; 18+ messages in thread
From: Greg Thelen @ 2011-10-13  7:18 UTC (permalink / raw)
  To: Glauber Costa
  Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
	netdev, linux-mm, kirill, avagin, devel

On Mon, Oct 10, 2011 at 3:24 AM, Glauber Costa <glommer@parallels.com> wrote:
> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> index 06eb6d9..bf00cd2 100644
> --- a/Documentation/cgroups/memory.txt
> +++ b/Documentation/cgroups/memory.txt
...
> @@ -255,6 +262,31 @@ 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

Extra leading space before 'With'.

> +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

s/Value/value/

> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 3508777..d25c5cb 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
...
> +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();

I do not think cgroup_lock,unlock are needed here.  The cont and
associated cgroup should be guaranteed by the caller to be valid.
Does this lock provide some other synchronization?

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^ permalink raw reply	[flat|nested] 18+ messages in thread

* Re: [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller
  2011-10-13  7:18   ` Greg Thelen
@ 2011-10-13  8:19     ` Glauber Costa
  0 siblings, 0 replies; 18+ messages in thread
From: Glauber Costa @ 2011-10-13  8:19 UTC (permalink / raw)
  To: Greg Thelen
  Cc: linux-kernel, paul, lizf, kamezawa.hiroyu, ebiederm, davem,
	netdev, linux-mm, kirill, avagin, devel

On 10/13/2011 11:18 AM, Greg Thelen wrote:
> On Mon, Oct 10, 2011 at 3:24 AM, Glauber Costa<glommer@parallels.com>  wrote:
>> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
>> index 06eb6d9..bf00cd2 100644
>> --- a/Documentation/cgroups/memory.txt
>> +++ b/Documentation/cgroups/memory.txt
> ...
>> @@ -255,6 +262,31 @@ 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
>
> Extra leading space before 'With'.
>
>> +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
>
> s/Value/value/
>
>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>> index 3508777..d25c5cb 100644
>> --- a/mm/memcontrol.c
>> +++ b/mm/memcontrol.c
> ...
>> +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();
>
> I do not think cgroup_lock,unlock are needed here.  The cont and
> associated cgroup should be guaranteed by the caller to be valid.
> Does this lock provide some other synchronization?
Yeah, I think I was being overcautious.

With the following comments addressed, can I add your Reviewed-by to 
this one ?

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^ permalink raw reply	[flat|nested] 18+ messages in thread

* [PATCH v6 2/8] socket: initial cgroup code.
  2011-10-10 10:24 [PATCH v6 0/8] per-cgroup tcp memory pressure handling Glauber Costa
  2011-10-10 10:24 ` [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
@ 2011-10-10 10:24 ` Glauber Costa
  2011-10-10 10:24 ` [PATCH v6 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
                   ` (5 subsequent siblings)
  7 siblings, 0 replies; 18+ messages in thread
From: Glauber Costa @ 2011-10-10 10:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel, 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>
Acked-by: Kirill A. Shutemov<kirill@shutemov.name>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtsu.com>
CC: David S. Miller <davem@davemloft.net>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
 include/linux/memcontrol.h |   15 +++++++++++++++
 include/net/sock.h         |    2 ++
 mm/memcontrol.c            |   37 +++++++++++++++++++++++++++++++++++++
 net/core/sock.c            |    3 +++
 4 files changed, 57 insertions(+), 0 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 343bd76..88aea1b 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -376,5 +376,20 @@ 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 d25c5cb..303d9d8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -376,6 +376,43 @@ enum mem_type {
 #define MEM_CGROUP_RECLAIM_SOFT_BIT	0x2
 #define MEM_CGROUP_RECLAIM_SOFT		(1 << MEM_CGROUP_RECLAIM_SOFT_BIT)
 
+/* 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 */
+	if (sk->sk_cgrp) {
+		WARN_ON(1);
+		return;
+	}
+
+	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 */
+
+
 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);
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);
 }
 
-- 
1.7.6.4

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^ permalink raw reply related	[flat|nested] 18+ messages in thread

* [PATCH v6 3/8] foundations of per-cgroup memory pressure controlling.
  2011-10-10 10:24 [PATCH v6 0/8] per-cgroup tcp memory pressure handling Glauber Costa
  2011-10-10 10:24 ` [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
  2011-10-10 10:24 ` [PATCH v6 2/8] socket: initial cgroup code Glauber Costa
@ 2011-10-10 10:24 ` Glauber Costa
  2011-10-13  5:53   ` KAMEZAWA Hiroyuki
  2011-10-10 10:24 ` [PATCH v6 4/8] per-cgroup tcp buffers control Glauber Costa
                   ` (4 subsequent siblings)
  7 siblings, 1 reply; 18+ messages in thread
From: Glauber Costa @ 2011-10-10 10:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel, 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             |    8 +++-
 include/linux/memcontrol.h  |   22 ++++++++-
 include/net/sock.h          |  114 ++++++++++++++++++++++++++++++++++++++++--
 include/net/tcp.h           |   12 +++--
 include/net/udp.h           |    4 +-
 include/trace/events/sock.h |   10 ++--
 mm/memcontrol.c             |   19 ++++++-
 net/core/sock.c             |   62 ++++++++++++++---------
 net/decnet/af_decnet.c      |   22 +++++++-
 net/ipv4/proc.c             |    7 ++-
 net/ipv4/tcp.c              |   28 +++++++++-
 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              |   21 ++++++--
 net/ipv6/tcp_ipv6.c         |   10 ++--
 net/ipv6/udp.c              |    4 +-
 net/sctp/socket.c           |   37 +++++++++++---
 19 files changed, 320 insertions(+), 88 deletions(-)

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index ac33d5f..09cdf11 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -29,10 +29,16 @@ struct alg_type_list {
 
 static atomic_long_t alg_memory_allocated;
 
+static long memory_allocated_alg(struct mem_cgroup *memcg, long val,
+				 int *parent_status)
+{
+	return atomic_long_add_return(val, &alg_memory_allocated);
+}
+
 static struct proto alg_proto = {
 	.name			= "ALG",
 	.owner			= THIS_MODULE,
-	.memory_allocated	= &alg_memory_allocated,
+	.mem_allocated_add	= memory_allocated_alg,
 	.obj_size		= sizeof(struct alg_sock),
 };
 
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 88aea1b..99a8ba2 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -361,6 +361,10 @@ 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)
@@ -377,12 +381,28 @@ mem_cgroup_print_bad_page(struct page *page)
 #endif
 
 #ifdef CONFIG_INET
+enum {
+	UNDER_LIMIT,
+	OVER_LIMIT,
+};
+
 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_sockets_allocated_dec(struct mem_cgroup *memcg, struct proto *prot);
+void memcg_sockets_allocated_inc(struct mem_cgroup *memcg, struct proto *prot);
 #else
+/* memcontrol includes sockets.h, that includes memcontrol.h ... */
+static inline void memcg_sockets_allocated_dec(struct mem_cgroup *memcg,
+					       struct proto *prot)
+{
+}
+static inline void memcg_sockets_allocated_inc(struct mem_cgroup *memcg,
+					       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..163f87b 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 +789,36 @@ 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. */
 	/*
-	 * Pressure flag: try to collapse.
+	 * Add a value in pages to the current memory allocation,
+	 * and return the current value.
+	 */
+	long			(*mem_allocated_add)(struct mem_cgroup *memcg,
+						     long val, int *parent_status);
+	/* Pointer to the current number of sockets in this cgroup. */
+	struct percpu_counter	*(*sockets_allocated)(const struct mem_cgroup *memcg);
+	/*
+	 * 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)(const struct mem_cgroup *memcg);
+	/* Pointer to the per-cgroup version of the the sysctl_mem field */
+	long			*(*prot_mem)(const struct mem_cgroup *memcg);
+
 	int			*sysctl_wmem;
 	int			*sysctl_rmem;
 	int			max_header;
@@ -856,6 +877,87 @@ 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 prot->mem_allocated_add(cg, 0, NULL);
+}
+
+static inline long
+sk_memory_allocated_add(struct sock *sk, int amt, int *parent_status)
+{
+	struct proto *prot = sk->sk_prot;
+	struct mem_cgroup *cg = sk->sk_cgrp;
+
+	return prot->mem_allocated_add(cg, amt, parent_status);
+}
+
+static inline void
+sk_memory_allocated_sub(struct sock *sk, int amt, int parent_status)
+{
+	struct proto *prot = sk->sk_prot;
+	struct mem_cgroup *cg = sk->sk_cgrp;
+
+	prot->mem_allocated_add(cg, -amt, &parent_status);
+}
+
+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 prot->mem_allocated_add(cg, 0, NULL);
+}
+
 
 #ifdef CONFIG_PROC_FS
 /* Called with local bh disabled */
@@ -952,7 +1054,7 @@ static inline int sk_mem_pages(int amt)
 static inline int sk_has_account(struct sock *sk)
 {
 	/* return true if protocol supports memory accounting */
-	return !!sk->sk_prot->memory_allocated;
+	return !!sk->sk_prot->mem_allocated_add;
 }
 
 static inline int sk_wmem_schedule(struct sock *sk, int size)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index acc620a..eac7bf6 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 +254,12 @@ 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(const struct mem_cgroup *memcg);
+struct percpu_counter *sockets_allocated_tcp(const struct mem_cgroup *memcg);
+int *memory_pressure_tcp(const struct mem_cgroup *memcg);
+long memory_allocated_tcp_add(struct mem_cgroup *memcg, long val,
+			      int *parent_status);
 
 /*
  * The next routines deal with comparing 32 bit unsigned ints
@@ -286,7 +290,7 @@ 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..eecd727 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -105,7 +105,9 @@ static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
 
 extern struct proto udp_prot;
 
-extern atomic_long_t udp_memory_allocated;
+long memory_allocated_udp_add(struct mem_cgroup *memcg, long val,
+			      int *parent_status);
+long *udp_sysctl_mem(const 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 303d9d8..ad55b28 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -376,6 +376,7 @@ enum mem_type {
 #define MEM_CGROUP_RECLAIM_SOFT_BIT	0x2
 #define MEM_CGROUP_RECLAIM_SOFT		(1 << MEM_CGROUP_RECLAIM_SOFT_BIT)
 
+static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
 /* Writing them here to avoid exposing memcg's inner layout */
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
 #ifdef CONFIG_INET
@@ -409,13 +410,27 @@ void sock_release_memcg(struct sock *sk)
 {
 	cgroup_release_and_wakeup_rmdir(mem_cgroup_css(sk->sk_cgrp));
 }
+
+void memcg_sockets_allocated_dec(struct mem_cgroup *memcg, struct proto *prot)
+{
+	memcg = parent_mem_cgroup(memcg);
+	for (; memcg; memcg = parent_mem_cgroup(memcg))
+		percpu_counter_dec(prot->sockets_allocated(memcg));
+}
+EXPORT_SYMBOL(memcg_sockets_allocated_dec);
+
+void memcg_sockets_allocated_inc(struct mem_cgroup *memcg, struct proto *prot)
+{
+	memcg = parent_mem_cgroup(memcg);
+	for (; memcg; memcg = parent_mem_cgroup(memcg))
+		percpu_counter_inc(prot->sockets_allocated(memcg));
+}
+EXPORT_SYMBOL(memcg_sockets_allocated_inc);
 #endif /* CONFIG_INET */
 #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
 
-
 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..22ef143 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_status = UNDER_LIMIT;
 
 	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_status);
+
+	/* Over hard limit (we, or our parents) */
+	if ((parent_status == OVER_LIMIT) || (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, parent_status);
+
 	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, 0);
 	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->mem_allocated_add != 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..724ac73 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -458,13 +458,29 @@ static void dn_enter_memory_pressure(struct sock *sk)
 	}
 }
 
+static long memory_allocated_dn_add(struct mem_cgroup *memcg,
+					      long val, int *parent_status)
+{
+	return atomic_long_add_return(val, &decnet_memory_allocated);
+}
+
+static int *memory_pressure_dn(const struct mem_cgroup *memcg)
+{
+	return &dn_memory_pressure;
+}
+
+static long *dn_sysctl_mem(const 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,
+	.mem_allocated_add	= memory_allocated_dn_add,
+	.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 4bfad5d..535456d 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..dc8f01e 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(const struct mem_cgroup *memcg)
+{
+	return &tcp_memory_pressure;
+}
+EXPORT_SYMBOL(memory_pressure_tcp);
+
+struct percpu_counter *sockets_allocated_tcp(const struct mem_cgroup *memcg)
+{
+	return &tcp_sockets_allocated;
+}
+EXPORT_SYMBOL(sockets_allocated_tcp);
 
 void tcp_enter_memory_pressure(struct sock *sk)
 {
@@ -326,6 +335,19 @@ void tcp_enter_memory_pressure(struct sock *sk)
 }
 EXPORT_SYMBOL(tcp_enter_memory_pressure);
 
+long *tcp_sysctl_mem(const struct mem_cgroup *memcg)
+{
+	return sysctl_tcp_mem;
+}
+EXPORT_SYMBOL(tcp_sysctl_mem);
+
+long memory_allocated_tcp_add(struct mem_cgroup *memcg, long val,
+			      int *parent_status)
+{
+	return atomic_long_add_return(val, &tcp_memory_allocated);
+}
+EXPORT_SYMBOL(memory_allocated_tcp_add);
+
 /* 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 d73aab3..87520ed 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]);
 	}
@@ -4804,7 +4804,7 @@ 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);
@@ -4870,11 +4870,11 @@ 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 7963e03..7072060 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1911,7 +1911,7 @@ 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;
@@ -1967,7 +1967,7 @@ 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);
 
@@ -2608,11 +2608,11 @@ 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,
+	.mem_allocated_add	= memory_allocated_tcp_add,
+	.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..21604b4 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 +1915,20 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
 }
 EXPORT_SYMBOL(udp_poll);
 
+static atomic_long_t udp_memory_allocated;
+long memory_allocated_udp_add(struct mem_cgroup *memcg, long val,
+			      int *parent_status)
+{
+	return atomic_long_add_return(val, &udp_memory_allocated);
+}
+EXPORT_SYMBOL(memory_allocated_udp_add);
+
+long *udp_sysctl_mem(const struct mem_cgroup *memcg)
+{
+	return sysctl_udp_mem;
+}
+EXPORT_SYMBOL(udp_sysctl_mem);
+
 struct proto udp_prot = {
 	.name		   = "UDP",
 	.owner		   = THIS_MODULE,
@@ -1936,8 +1947,8 @@ 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,
+	.mem_allocated_add = &memory_allocated_udp_add,
+	.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 7b8fc57..bdc0003 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1992,7 +1992,7 @@ 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;
@@ -2201,11 +2201,11 @@ 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,
+	.mem_allocated_add	= memory_allocated_tcp_add,
+	.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 bb95e8e..0be7cbc 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,
+	.mem_allocated_add = memory_allocated_udp_add,
+	.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..8c0cde9 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -119,11 +119,32 @@ static int sctp_memory_pressure;
 static atomic_long_t sctp_memory_allocated;
 struct percpu_counter sctp_sockets_allocated;
 
+static long *sctp_sysctl_mem(const 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(const struct mem_cgroup *memcg)
+{
+	return &sctp_memory_pressure;
+}
+
+static long memory_allocated_sctp_add(struct mem_cgroup *memcg, long val,
+				      int *parent_status)
+{
+	return atomic_long_add_return(val, &sctp_memory_allocated);
+}
+
+static struct
+percpu_counter *sockets_allocated_sctp(const 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 +6852,13 @@ 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,
+	.mem_allocated_add = memory_allocated_sctp_add,
+	.sockets_allocated = sockets_allocated_sctp,
 };
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
@@ -6863,12 +6884,12 @@ 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,
+	.mem_allocated_add = memory_allocated_sctp_add,
+	.sockets_allocated = sockets_allocated_sctp,
 };
 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
-- 
1.7.6.4

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^ permalink raw reply related	[flat|nested] 18+ messages in thread

* Re: [PATCH v6 3/8] foundations of per-cgroup memory pressure controlling.
  2011-10-10 10:24 ` [PATCH v6 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
@ 2011-10-13  5:53   ` KAMEZAWA Hiroyuki
  2011-10-13  8:25     ` Glauber Costa
  0 siblings, 1 reply; 18+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-13  5:53 UTC (permalink / raw)
  To: Glauber Costa
  Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel

On Mon, 10 Oct 2011 14:24:23 +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>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

a nitpick.


>  #ifdef CONFIG_INET
> +enum {
> +	UNDER_LIMIT,
> +	OVER_LIMIT,
> +};
> +

It may be better to move this to res_counter.h or memcontrol.h


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^ permalink raw reply	[flat|nested] 18+ messages in thread

* Re: [PATCH v6 3/8] foundations of per-cgroup memory pressure controlling.
  2011-10-13  5:53   ` KAMEZAWA Hiroyuki
@ 2011-10-13  8:25     ` Glauber Costa
  0 siblings, 0 replies; 18+ messages in thread
From: Glauber Costa @ 2011-10-13  8:25 UTC (permalink / raw)
  To: KAMEZAWA Hiroyuki
  Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel

On 10/13/2011 09:53 AM, KAMEZAWA Hiroyuki wrote:
> On Mon, 10 Oct 2011 14:24:23 +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>
>
> Reviewed-by: KAMEZAWA Hiroyuki<kamezawa.hiroyu@jp.fujitsu.com>
>
> a nitpick.
>
>
>>   #ifdef CONFIG_INET
>> +enum {
>> +	UNDER_LIMIT,
>> +	OVER_LIMIT,
>> +};
>> +
>
> It may be better to move this to res_counter.h or memcontrol.h
>
Sorry Kame,

It is in memcontrol.h already. What exactly do you mean here ?



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^ permalink raw reply	[flat|nested] 18+ messages in thread

* [PATCH v6 4/8] per-cgroup tcp buffers control
  2011-10-10 10:24 [PATCH v6 0/8] per-cgroup tcp memory pressure handling Glauber Costa
                   ` (2 preceding siblings ...)
  2011-10-10 10:24 ` [PATCH v6 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
@ 2011-10-10 10:24 ` Glauber Costa
  2011-10-13  5:56   ` KAMEZAWA Hiroyuki
  2011-10-10 10:24 ` [PATCH v6 5/8] per-netns ipv4 sysctl_tcp_mem Glauber Costa
                   ` (3 subsequent siblings)
  7 siblings, 1 reply; 18+ messages in thread
From: Glauber Costa @ 2011-10-10 10:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel, Glauber Costa, KAMEZAWA Hiroyuki

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: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtisu.com>
CC: David S. Miller <davem@davemloft.net>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
 include/linux/memcontrol.h |    4 +
 include/net/sock.h         |   14 ++++
 include/net/tcp.h          |   17 +++++
 mm/memcontrol.c            |  141 ++++++++++++++++++++++++++++++++++++++++++++
 net/core/sock.c            |   39 +++++++++++-
 net/ipv4/tcp.c             |   47 +++++++--------
 net/ipv4/tcp_ipv4.c        |   11 ++++
 net/ipv6/tcp_ipv6.c        |   10 +++-
 8 files changed, 255 insertions(+), 28 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 99a8ba2..a27dad9 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -393,6 +393,10 @@ void sock_update_memcg(struct sock *sk);
 void sock_release_memcg(struct sock *sk);
 void memcg_sockets_allocated_dec(struct mem_cgroup *memcg, struct proto *prot);
 void memcg_sockets_allocated_inc(struct mem_cgroup *memcg, struct proto *prot);
+int tcp_init_cgroup(const struct proto *prot, struct cgroup *cgrp,
+		    struct cgroup_subsys *ss);
+void tcp_destroy_cgroup(const struct proto *prot, struct cgroup *cgrp,
+			struct cgroup_subsys *ss);
 #else
 /* memcontrol includes sockets.h, that includes memcontrol.h ... */
 static inline void memcg_sockets_allocated_dec(struct mem_cgroup *memcg,
diff --git a/include/net/sock.h b/include/net/sock.h
index 163f87b..efd7664 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
@@ -819,6 +821,18 @@ struct proto {
 	/* Pointer to the per-cgroup version of the the sysctl_mem field */
 	long			*(*prot_mem)(const 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)(const struct proto *prot,
+					       struct cgroup *cgrp,
+					       struct cgroup_subsys *ss);
+	void			(*destroy_cgroup)(const 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 eac7bf6..ec57cf2 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -31,6 +31,7 @@
 #include <linux/crypto.h>
 #include <linux/cryptohash.h>
 #include <linux/kref.h>
+#include <linux/res_counter.h>
 
 #include <net/inet_connection_sock.h>
 #include <net/inet_timewait_sock.h>
@@ -255,6 +256,21 @@ 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 */
+	struct res_counter 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(const struct mem_cgroup *memcg);
+struct percpu_counter *sockets_allocated_tcp_nocg(const struct mem_cgroup *memcg);
+int *memory_pressure_tcp_nocg(const struct mem_cgroup *memcg);
+long memory_allocated_tcp_add_nocg(struct mem_cgroup *memcg, long val,
+				   int *parent_status);
+
 extern long *tcp_sysctl_mem(const struct mem_cgroup *memcg);
 struct percpu_counter *sockets_allocated_tcp(const struct mem_cgroup *memcg);
 int *memory_pressure_tcp(const struct mem_cgroup *memcg);
@@ -1023,6 +1039,7 @@ 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 ad55b28..efff83b 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>
 
@@ -294,6 +297,10 @@ struct mem_cgroup {
 	 */
 	struct mem_cgroup_stat_cpu nocpu_base;
 	spinlock_t pcp_counter_lock;
+
+#ifdef CONFIG_INET
+	struct tcp_memcontrol tcp;
+#endif
 };
 
 /* Stuffs for move charges at task migration. */
@@ -377,10 +384,12 @@ enum mem_type {
 #define MEM_CGROUP_RECLAIM_SOFT		(1 << MEM_CGROUP_RECLAIM_SOFT_BIT)
 
 static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
+static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
 /* Writing them here to avoid exposing memcg's inner layout */
 #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)
 {
@@ -426,6 +435,119 @@ void memcg_sockets_allocated_inc(struct mem_cgroup *memcg, struct proto *prot)
 		percpu_counter_inc(prot->sockets_allocated(memcg));
 }
 EXPORT_SYMBOL(memcg_sockets_allocated_inc);
+
+/*
+ * 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;
+	}
+}
+EXPORT_SYMBOL(tcp_enter_memory_pressure);
+
+#define CONSTCG(m) ((struct mem_cgroup *)(m))
+long *tcp_sysctl_mem(const struct mem_cgroup *memcg)
+{
+	return CONSTCG(memcg)->tcp.tcp_prot_mem;
+}
+EXPORT_SYMBOL(tcp_sysctl_mem);
+
+/*
+ * We will be passed a value in pages. But our limits are internally
+ * all in bytes. We need to convert it before testing the allocation,
+ * and convert it back when returning data to the network layer
+ */
+long memory_allocated_tcp_add(struct mem_cgroup *memcg, long val,
+			      int *parent_status)
+{
+	int ret = 0;
+	struct res_counter *failed;
+
+	if (val > 0) {
+		val <<= PAGE_SHIFT;
+		ret = res_counter_charge(&memcg->tcp.tcp_memory_allocated,
+					 val, &failed);
+		if (!ret)
+			*parent_status = UNDER_LIMIT;
+		else
+			*parent_status = OVER_LIMIT;
+	} else if (val < 0) {
+		if (*parent_status == OVER_LIMIT)
+			/*
+			 * res_counter charge already surely uncharged the
+			 * parent if something went wrong.
+			 */
+			WARN_ON(1);
+		else {
+			val = (-val) << PAGE_SHIFT;
+			res_counter_uncharge(&memcg->tcp.tcp_memory_allocated,
+					     val);
+		}
+	}
+
+	return res_counter_read_u64(&memcg->tcp.tcp_memory_allocated,
+				    RES_USAGE) >> PAGE_SHIFT;
+}
+EXPORT_SYMBOL(memory_allocated_tcp_add);
+
+int *memory_pressure_tcp(const struct mem_cgroup *memcg)
+{
+	return &CONSTCG(memcg)->tcp.tcp_memory_pressure;
+}
+EXPORT_SYMBOL(memory_pressure_tcp);
+
+struct percpu_counter *sockets_allocated_tcp(const struct mem_cgroup *memcg)
+{
+	return &CONSTCG(memcg)->tcp.tcp_sockets_allocated;
+}
+EXPORT_SYMBOL(sockets_allocated_tcp);
+
+static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
+{
+	struct res_counter *parent_res_counter = NULL;
+	struct mem_cgroup *parent = parent_mem_cgroup(cg);
+
+	if (parent)
+		parent_res_counter = &parent->tcp.tcp_memory_allocated;
+
+	cg->tcp.tcp_memory_pressure = 0;
+	res_counter_init(&cg->tcp.tcp_memory_allocated, parent_res_counter);
+	percpu_counter_init(&cg->tcp.tcp_sockets_allocated, 0);
+}
+
+int tcp_init_cgroup(const struct proto *prot, struct cgroup *cgrp,
+		    struct cgroup_subsys *ss)
+{
+	struct mem_cgroup *memcg = 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
+	 */
+	memcg->tcp.tcp_prot_mem[0] = sysctl_tcp_mem[0];
+	memcg->tcp.tcp_prot_mem[1] = sysctl_tcp_mem[1];
+	memcg->tcp.tcp_prot_mem[2] = sysctl_tcp_mem[2];
+
+	return 0;
+}
+EXPORT_SYMBOL(tcp_init_cgroup);
+
+void tcp_destroy_cgroup(const struct proto *prot, struct cgroup *cgrp,
+			struct cgroup_subsys *ss)
+{
+	struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+
+	percpu_counter_destroy(&memcg->tcp.tcp_sockets_allocated);
+}
+EXPORT_SYMBOL(tcp_destroy_cgroup);
+#undef CONSTCG
 #endif /* CONFIG_INET */
 #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
 
@@ -4835,14 +4957,27 @@ static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
 
 	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)
 {
 	return 0;
 }
+
+static void kmem_cgroup_destroy(struct cgroup_subsys *ss,
+				struct cgroup *cont)
+{
+}
 #endif
 
 static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
@@ -5060,6 +5195,10 @@ 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);
@@ -5085,6 +5224,8 @@ 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 22ef143..3fa3ccb 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 dc8f01e..259f6d9 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
  */
@@ -306,47 +299,51 @@ 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(const struct mem_cgroup *memcg)
+int *memory_pressure_tcp_nocg(const 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(const struct mem_cgroup *memcg)
+struct percpu_counter
+*sockets_allocated_tcp_nocg(const 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(const struct mem_cgroup *memcg)
+long *tcp_sysctl_mem_nocg(const struct mem_cgroup *memcg)
 {
 	return sysctl_tcp_mem;
 }
-EXPORT_SYMBOL(tcp_sysctl_mem);
+EXPORT_SYMBOL(tcp_sysctl_mem_nocg);
 
-long memory_allocated_tcp_add(struct mem_cgroup *memcg, long val,
-			      int *parent_status)
+long memory_allocated_tcp_add_nocg(struct mem_cgroup *memcg, long val,
+				   int *parent_status)
 {
 	return atomic_long_add_return(val, &tcp_memory_allocated);
 }
-EXPORT_SYMBOL(memory_allocated_tcp_add);
+EXPORT_SYMBOL(memory_allocated_tcp_add_nocg);
 
 /* Convert seconds to retransmits based on initial and max timeout */
 static u8 secs_to_retrans(int seconds, int timeout, int rto_max)
@@ -3248,7 +3245,9 @@ 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 7072060..aac71e9 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2607,12 +2607,23 @@ 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,
 	.mem_allocated_add	= memory_allocated_tcp_add,
 	.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,
+	.mem_allocated_add	= memory_allocated_tcp_add_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 bdc0003..0a52587 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2200,12 +2200,20 @@ 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,
 	.mem_allocated_add	= memory_allocated_tcp_add,
 	.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,
+	.mem_allocated_add	= memory_allocated_tcp_add_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,
-- 
1.7.6.4

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^ permalink raw reply related	[flat|nested] 18+ messages in thread

* Re: [PATCH v6 4/8] per-cgroup tcp buffers control
  2011-10-10 10:24 ` [PATCH v6 4/8] per-cgroup tcp buffers control Glauber Costa
@ 2011-10-13  5:56   ` KAMEZAWA Hiroyuki
  0 siblings, 0 replies; 18+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-13  5:56 UTC (permalink / raw)
  To: Glauber Costa
  Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel

On Mon, 10 Oct 2011 14:24:24 +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: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtisu.com>
> CC: David S. Miller <davem@davemloft.net>
> 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] 18+ messages in thread

* [PATCH v6 5/8] per-netns ipv4 sysctl_tcp_mem
  2011-10-10 10:24 [PATCH v6 0/8] per-cgroup tcp memory pressure handling Glauber Costa
                   ` (3 preceding siblings ...)
  2011-10-10 10:24 ` [PATCH v6 4/8] per-cgroup tcp buffers control Glauber Costa
@ 2011-10-10 10:24 ` Glauber Costa
  2011-10-10 10:24 ` [PATCH v6 6/8] tcp buffer limitation: per-cgroup limit Glauber Costa
                   ` (2 subsequent siblings)
  7 siblings, 0 replies; 18+ messages in thread
From: Glauber Costa @ 2011-10-10 10:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel, 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>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: David S. Miller <davem@davemloft.net>
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 ec57cf2..3609d87 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -232,7 +232,6 @@ 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 efff83b..651badb 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -390,6 +390,7 @@ static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
 #ifdef CONFIG_INET
 #include <net/sock.h>
 #include <net/ip.h>
+#include <linux/nsproxy.h>
 
 void sock_update_memcg(struct sock *sk)
 {
@@ -526,14 +527,15 @@ int tcp_init_cgroup(const struct proto *prot, struct cgroup *cgrp,
 		    struct cgroup_subsys *ss)
 {
 	struct mem_cgroup *memcg = 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
 	 */
-	memcg->tcp.tcp_prot_mem[0] = sysctl_tcp_mem[0];
-	memcg->tcp.tcp_prot_mem[1] = sysctl_tcp_mem[1];
-	memcg->tcp.tcp_prot_mem[2] = sysctl_tcp_mem[2];
+	memcg->tcp.tcp_prot_mem[0] = net->ipv4.sysctl_tcp_mem[0];
+	memcg->tcp.tcp_prot_mem[1] = net->ipv4.sysctl_tcp_mem[1];
+	memcg->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 259f6d9..b1abebd 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);
 
@@ -334,7 +332,7 @@ EXPORT_SYMBOL(tcp_enter_memory_pressure_nocg);
 
 long *tcp_sysctl_mem_nocg(const struct mem_cgroup *memcg)
 {
-	return sysctl_tcp_mem;
+	return init_net.ipv4.sysctl_tcp_mem;
 }
 EXPORT_SYMBOL(tcp_sysctl_mem_nocg);
 
@@ -3298,14 +3296,9 @@ 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;
-- 
1.7.6.4

--
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^ permalink raw reply related	[flat|nested] 18+ messages in thread

* [PATCH v6 6/8] tcp buffer limitation: per-cgroup limit
  2011-10-10 10:24 [PATCH v6 0/8] per-cgroup tcp memory pressure handling Glauber Costa
                   ` (4 preceding siblings ...)
  2011-10-10 10:24 ` [PATCH v6 5/8] per-netns ipv4 sysctl_tcp_mem Glauber Costa
@ 2011-10-10 10:24 ` Glauber Costa
  2011-10-13  5:58   ` KAMEZAWA Hiroyuki
  2011-10-10 10:24 ` [PATCH v6 7/8] Display current tcp memory allocation in kmem cgroup Glauber Costa
  2011-10-10 10:24 ` [PATCH v6 8/8] Disable task moving when using kernel memory accounting Glauber Costa
  7 siblings, 1 reply; 18+ messages in thread
From: Glauber Costa @ 2011-10-10 10:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel, 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 +++++
 mm/memcontrol.c                  |   79 ++++++++++++++++++++++++++++++++++----
 net/ipv4/sysctl_net_ipv4.c       |   20 ++++++++++
 4 files changed, 102 insertions(+), 8 deletions(-)

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index bf00cd2..c1db134 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.limit_in_bytes  # set/show hard limit for tcp buf memory
 
 1. History
 
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index a27dad9..e0ccec5 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -397,6 +397,9 @@ int tcp_init_cgroup(const struct proto *prot, struct cgroup *cgrp,
 		    struct cgroup_subsys *ss);
 void tcp_destroy_cgroup(const struct proto *prot, struct cgroup *cgrp,
 			struct cgroup_subsys *ss);
+
+unsigned long long tcp_max_memory(const struct mem_cgroup *memcg);
+void tcp_prot_mem(struct mem_cgroup *memcg, long val, int idx);
 #else
 /* memcontrol includes sockets.h, that includes memcontrol.h ... */
 static inline void memcg_sockets_allocated_dec(struct mem_cgroup *memcg,
@@ -413,6 +416,13 @@ static inline void sock_update_memcg(struct sock *sk)
 static inline void sock_release_memcg(struct sock *sk)
 {
 }
+static inline unsigned long long tcp_max_memory(const struct mem_cgroup *memcg)
+{
+	return -1ULL;
+}
+static inline void tcp_prot_mem(struct mem_cgroup *memcg, long val, int idx)
+{
+}
 #endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
 #endif /* CONFIG_INET */
 #endif /* _LINUX_MEMCONTROL_H */
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 651badb..60e0ec0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -365,6 +365,7 @@ enum mem_type {
 	_MEMSWAP,
 	_OOM_TYPE,
 	_KMEM,
+	_KMEM_TCP,
 };
 
 #define MEMFILE_PRIVATE(x, val)	(((x) << 16) | (val))
@@ -385,6 +386,11 @@ enum mem_type {
 
 static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
 static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
+static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
+{
+	return (memcg == root_mem_cgroup);
+}
+
 /* Writing them here to avoid exposing memcg's inner layout */
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
 #ifdef CONFIG_INET
@@ -510,6 +516,35 @@ struct percpu_counter *sockets_allocated_tcp(const struct mem_cgroup *memcg)
 }
 EXPORT_SYMBOL(sockets_allocated_tcp);
 
+static void tcp_update_limit(struct mem_cgroup *memcg, u64 val)
+{
+	struct net *net = current->nsproxy->net_ns;
+	int i;
+
+	val >>= PAGE_SHIFT;
+
+	for (i = 0; i < 3; i++)
+		memcg->tcp.tcp_prot_mem[i]  = min_t(long, val,
+					     net->ipv4.sysctl_tcp_mem[i]);
+}
+
+static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
+			    const char *buffer);
+
+static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft);
+/*
+ * We need those things internally in pages, so don't reuse
+ * mem_cgroup_{read,write}
+ */
+static struct cftype tcp_files[] = {
+	{
+		.name = "kmem.tcp.limit_in_bytes",
+		.write_string = mem_cgroup_write,
+		.read_u64 = mem_cgroup_read,
+		.private = MEMFILE_PRIVATE(_KMEM_TCP, RES_LIMIT),
+	},
+};
+
 static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
 {
 	struct res_counter *parent_res_counter = NULL;
@@ -527,6 +562,7 @@ int tcp_init_cgroup(const struct proto *prot, struct cgroup *cgrp,
 		    struct cgroup_subsys *ss)
 {
 	struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+	struct mem_cgroup *parent = parent_mem_cgroup(memcg);
 	struct net *net = current->nsproxy->net_ns;
 	/*
 	 * We need to initialize it at populate, not create time.
@@ -537,7 +573,20 @@ int tcp_init_cgroup(const struct proto *prot, struct cgroup *cgrp,
 	memcg->tcp.tcp_prot_mem[1] = net->ipv4.sysctl_tcp_mem[1];
 	memcg->tcp.tcp_prot_mem[2] = net->ipv4.sysctl_tcp_mem[2];
 
-	return 0;
+	/* Let root cgroup unlimited. All others, respect parent's if needed */
+	if (parent && !parent->use_hierarchy) {
+		unsigned long limit;
+		int ret;
+		limit = nr_free_buffer_pages() / 8;
+		limit = max(limit, 128UL);
+		ret = res_counter_set_limit(&memcg->tcp.tcp_memory_allocated,
+					    limit * 2);
+		if (ret)
+			return ret;
+	}
+
+	return cgroup_add_files(cgrp, ss, tcp_files,
+				ARRAY_SIZE(tcp_files));
 }
 EXPORT_SYMBOL(tcp_init_cgroup);
 
@@ -549,7 +598,18 @@ void tcp_destroy_cgroup(const struct proto *prot, struct cgroup *cgrp,
 	percpu_counter_destroy(&memcg->tcp.tcp_sockets_allocated);
 }
 EXPORT_SYMBOL(tcp_destroy_cgroup);
+
+unsigned long long tcp_max_memory(const struct mem_cgroup *memcg)
+{
+	return res_counter_read_u64(&CONSTCG(memcg)->tcp.tcp_memory_allocated,
+				    RES_LIMIT);
+}
 #undef CONSTCG
+
+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 */
 
@@ -1048,12 +1108,6 @@ 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;
@@ -4071,7 +4125,9 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
 	case _KMEM:
 		val = res_counter_read_u64(&mem->kmem, name);
 		break;
-
+	case _KMEM_TCP:
+		val = res_counter_read_u64(&mem->tcp.tcp_memory_allocated, name);
+		break;
 	default:
 		BUG();
 		break;
@@ -4104,6 +4160,13 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
 			break;
 		if (type == _MEM)
 			ret = mem_cgroup_resize_limit(memcg, val);
+#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_INET)
+		else if (type == _KMEM_TCP) {
+			ret = res_counter_set_limit(&memcg->tcp.tcp_memory_allocated,
+						    val);
+			tcp_update_limit(memcg, val);
+		}
+#endif
 		else
 			ret = mem_cgroup_resize_memsw_limit(memcg, val);
 		break;
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];
-- 
1.7.6.4

--
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^ permalink raw reply related	[flat|nested] 18+ messages in thread

* Re: [PATCH v6 6/8] tcp buffer limitation: per-cgroup limit
  2011-10-10 10:24 ` [PATCH v6 6/8] tcp buffer limitation: per-cgroup limit Glauber Costa
@ 2011-10-13  5:58   ` KAMEZAWA Hiroyuki
  0 siblings, 0 replies; 18+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-13  5:58 UTC (permalink / raw)
  To: Glauber Costa
  Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel

On Mon, 10 Oct 2011 14:24:26 +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>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply	[flat|nested] 18+ messages in thread

* [PATCH v6 7/8] Display current tcp memory allocation in kmem cgroup
  2011-10-10 10:24 [PATCH v6 0/8] per-cgroup tcp memory pressure handling Glauber Costa
                   ` (5 preceding siblings ...)
  2011-10-10 10:24 ` [PATCH v6 6/8] tcp buffer limitation: per-cgroup limit Glauber Costa
@ 2011-10-10 10:24 ` Glauber Costa
  2011-10-13  5:59   ` KAMEZAWA Hiroyuki
  2011-10-10 10:24 ` [PATCH v6 8/8] Disable task moving when using kernel memory accounting Glauber Costa
  7 siblings, 1 reply; 18+ messages in thread
From: Glauber Costa @ 2011-10-10 10:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel, 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                  |    5 +++++
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index c1db134..00f1a88 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.limit_in_bytes  # set/show hard limit for tcp buf memory
+ memory.kmem.tcp.usage_in_bytes  # show current tcp buf memory allocation
 
 1. History
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 60e0ec0..ca08be2 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -543,6 +543,11 @@ static struct cftype tcp_files[] = {
 		.read_u64 = mem_cgroup_read,
 		.private = MEMFILE_PRIVATE(_KMEM_TCP, RES_LIMIT),
 	},
+	{
+		.name = "kmem.tcp.usage_in_bytes",
+		.read_u64 = mem_cgroup_read,
+		.private = MEMFILE_PRIVATE(_KMEM_TCP, RES_USAGE),
+	},
 };
 
 static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
-- 
1.7.6.4

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^ permalink raw reply related	[flat|nested] 18+ messages in thread

* Re: [PATCH v6 7/8] Display current tcp memory allocation in kmem cgroup
  2011-10-10 10:24 ` [PATCH v6 7/8] Display current tcp memory allocation in kmem cgroup Glauber Costa
@ 2011-10-13  5:59   ` KAMEZAWA Hiroyuki
  0 siblings, 0 replies; 18+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-13  5:59 UTC (permalink / raw)
  To: Glauber Costa
  Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel

On Mon, 10 Oct 2011 14:24:27 +0400
Glauber Costa <glommer@parallels.com> 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>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

--
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^ permalink raw reply	[flat|nested] 18+ messages in thread

* [PATCH v6 8/8] Disable task moving when using kernel memory accounting
  2011-10-10 10:24 [PATCH v6 0/8] per-cgroup tcp memory pressure handling Glauber Costa
                   ` (6 preceding siblings ...)
  2011-10-10 10:24 ` [PATCH v6 7/8] Display current tcp memory allocation in kmem cgroup Glauber Costa
@ 2011-10-10 10:24 ` Glauber Costa
  2011-10-13  6:00   ` KAMEZAWA Hiroyuki
  7 siblings, 1 reply; 18+ messages in thread
From: Glauber Costa @ 2011-10-10 10:24 UTC (permalink / raw)
  To: linux-kernel
  Cc: paul, lizf, kamezawa.hiroyu, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel, 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>
---
 mm/memcontrol.c |   31 ++++++++++++++++++-------------
 1 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ca08be2..8d1beeb 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -408,23 +408,11 @@ 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_sockets_allocated_dec(struct mem_cgroup *memcg, struct proto *prot)
@@ -5636,10 +5624,17 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
 {
 	int ret = 0;
 	struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup);
+	struct mem_cgroup *from = mem_cgroup_from_task(p);
+
+	if (from != mem &&
+	    res_counter_read_u64(&mem->tcp.tcp_memory_allocated, RES_USAGE)) {
+		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);
 
 		VM_BUG_ON(from == mem);
 
@@ -5807,6 +5802,16 @@ 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);
+	struct mem_cgroup *from = mem_cgroup_from_task(p);
+
+	if (from != mem &&
+	    res_counter_read_u64(&mem->tcp.tcp_memory_allocated, RES_USAGE)) {
+		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,
-- 
1.7.6.4

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^ permalink raw reply related	[flat|nested] 18+ messages in thread

* Re: [PATCH v6 8/8] Disable task moving when using kernel memory accounting
  2011-10-10 10:24 ` [PATCH v6 8/8] Disable task moving when using kernel memory accounting Glauber Costa
@ 2011-10-13  6:00   ` KAMEZAWA Hiroyuki
  0 siblings, 0 replies; 18+ messages in thread
From: KAMEZAWA Hiroyuki @ 2011-10-13  6:00 UTC (permalink / raw)
  To: Glauber Costa
  Cc: linux-kernel, paul, lizf, ebiederm, davem, gthelen, netdev,
	linux-mm, kirill, avagin, devel

On Mon, 10 Oct 2011 14:24:28 +0400
Glauber Costa <glommer@parallels.com> wrote:

> 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>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

--
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^ permalink raw reply	[flat|nested] 18+ messages in thread

end of thread, other threads:[~2011-10-13  8:26 UTC | newest]

Thread overview: 18+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-10-10 10:24 [PATCH v6 0/8] per-cgroup tcp memory pressure handling Glauber Costa
2011-10-10 10:24 ` [PATCH v6 1/8] Basic kernel memory functionality for the Memory Controller Glauber Costa
2011-10-13  5:44   ` KAMEZAWA Hiroyuki
2011-10-13  7:18   ` Greg Thelen
2011-10-13  8:19     ` Glauber Costa
2011-10-10 10:24 ` [PATCH v6 2/8] socket: initial cgroup code Glauber Costa
2011-10-10 10:24 ` [PATCH v6 3/8] foundations of per-cgroup memory pressure controlling Glauber Costa
2011-10-13  5:53   ` KAMEZAWA Hiroyuki
2011-10-13  8:25     ` Glauber Costa
2011-10-10 10:24 ` [PATCH v6 4/8] per-cgroup tcp buffers control Glauber Costa
2011-10-13  5:56   ` KAMEZAWA Hiroyuki
2011-10-10 10:24 ` [PATCH v6 5/8] per-netns ipv4 sysctl_tcp_mem Glauber Costa
2011-10-10 10:24 ` [PATCH v6 6/8] tcp buffer limitation: per-cgroup limit Glauber Costa
2011-10-13  5:58   ` KAMEZAWA Hiroyuki
2011-10-10 10:24 ` [PATCH v6 7/8] Display current tcp memory allocation in kmem cgroup Glauber Costa
2011-10-13  5:59   ` KAMEZAWA Hiroyuki
2011-10-10 10:24 ` [PATCH v6 8/8] Disable task moving when using kernel memory accounting Glauber Costa
2011-10-13  6:00   ` KAMEZAWA Hiroyuki

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