* [PATCH 01/10] staging: zcache: fix account foregin counters against zero-filled pages
2013-04-10 0:25 Wanpeng Li
@ 2013-04-10 0:25 ` Wanpeng Li
2013-04-10 0:25 ` [PATCH 02/10] staging: zcache: remove zcache_freeze Wanpeng Li
` (8 subsequent siblings)
9 siblings, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:25 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
zero-filled pages won't be compressed and sent to remote system. Monitor
the number ephemeral and persistent pages that Ramster has sent make no
sense. This patch skip account foregin counters against zero-filled pages.
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/zcache-main.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index f3de76d..e23d814 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -415,7 +415,7 @@ create_in_new_page:
got_pampd:
inc_zcache_eph_zbytes(clen);
inc_zcache_eph_zpages();
- if (ramster_enabled && raw)
+ if (ramster_enabled && raw && !zero_filled)
ramster_count_foreign_pages(true, 1);
if (zero_filled)
pampd = (void *)ZERO_FILLED;
@@ -500,7 +500,7 @@ create_in_new_page:
got_pampd:
inc_zcache_pers_zpages();
inc_zcache_pers_zbytes(clen);
- if (ramster_enabled && raw)
+ if (ramster_enabled && raw && !zero_filled)
ramster_count_foreign_pages(false, 1);
if (zero_filled)
pampd = (void *)ZERO_FILLED;
@@ -681,7 +681,7 @@ zero_fill:
dec_zcache_pers_zpages(zpages);
dec_zcache_pers_zbytes(zsize);
}
- if (!is_local_client(pool->client))
+ if (!is_local_client(pool->client) && !zero_filled)
ramster_count_foreign_pages(eph, -1);
if (page && !zero_filled)
zcache_free_page(page);
@@ -732,7 +732,7 @@ static void zcache_pampd_free(void *pampd, struct tmem_pool *pool,
dec_zcache_pers_zpages(zpages);
dec_zcache_pers_zbytes(zsize);
}
- if (!is_local_client(pool->client))
+ if (!is_local_client(pool->client) && !zero_filled)
ramster_count_foreign_pages(is_ephemeral(pool), -1);
if (page && !zero_filled)
zcache_free_page(page);
--
1.7.10.4
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^ permalink raw reply related [flat|nested] 21+ messages in thread* [PATCH 02/10] staging: zcache: remove zcache_freeze
2013-04-10 0:25 Wanpeng Li
2013-04-10 0:25 ` [PATCH 01/10] staging: zcache: fix account foregin counters against zero-filled pages Wanpeng Li
@ 2013-04-10 0:25 ` Wanpeng Li
2013-04-10 0:25 ` [PATCH 03/10] staging: ramster: Provide accessory functions for counter increase Wanpeng Li
` (7 subsequent siblings)
9 siblings, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:25 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
The default value of zcache_freeze is false and it won't be modified by
other codes. Remove zcache_freeze since no routine can disable zcache
during system running.
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/zcache-main.c | 55 +++++++++++-----------------------
1 file changed, 18 insertions(+), 37 deletions(-)
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index e23d814..fe6801a 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -1118,15 +1118,6 @@ free_and_out:
#endif /* CONFIG_ZCACHE_WRITEBACK */
/*
- * When zcache is disabled ("frozen"), pools can be created and destroyed,
- * but all puts (and thus all other operations that require memory allocation)
- * must fail. If zcache is unfrozen, accepts puts, then frozen again,
- * data consistency requires all puts while frozen to be converted into
- * flushes.
- */
-static bool zcache_freeze;
-
-/*
* This zcache shrinker interface reduces the number of ephemeral pageframes
* used by zcache to approximately the same as the total number of LRU_FILE
* pageframes in use, and now also reduces the number of persistent pageframes
@@ -1221,44 +1212,34 @@ int zcache_put_page(int cli_id, int pool_id, struct tmem_oid *oidp,
{
struct tmem_pool *pool;
struct tmem_handle th;
- int ret = -1;
+ int ret = 0;
void *pampd = NULL;
BUG_ON(!irqs_disabled());
pool = zcache_get_pool_by_id(cli_id, pool_id);
if (unlikely(pool == NULL))
goto out;
- if (!zcache_freeze) {
- ret = 0;
- th.client_id = cli_id;
- th.pool_id = pool_id;
- th.oid = *oidp;
- th.index = index;
- pampd = zcache_pampd_create((char *)page, size, raw,
- ephemeral, &th);
- if (pampd == NULL) {
- ret = -ENOMEM;
- if (ephemeral)
- inc_zcache_failed_eph_puts();
- else
- inc_zcache_failed_pers_puts();
- } else {
- if (ramster_enabled)
- ramster_do_preload_flnode(pool);
- ret = tmem_put(pool, oidp, index, 0, pampd);
- if (ret < 0)
- BUG();
- }
- zcache_put_pool(pool);
+
+ th.client_id = cli_id;
+ th.pool_id = pool_id;
+ th.oid = *oidp;
+ th.index = index;
+ pampd = zcache_pampd_create((char *)page, size, raw,
+ ephemeral, &th);
+ if (pampd == NULL) {
+ ret = -ENOMEM;
+ if (ephemeral)
+ inc_zcache_failed_eph_puts();
+ else
+ inc_zcache_failed_pers_puts();
} else {
- inc_zcache_put_to_flush();
if (ramster_enabled)
ramster_do_preload_flnode(pool);
- if (atomic_read(&pool->obj_count) > 0)
- /* the put fails whether the flush succeeds or not */
- (void)tmem_flush_page(pool, oidp, index);
- zcache_put_pool(pool);
+ ret = tmem_put(pool, oidp, index, 0, pampd);
+ if (ret < 0)
+ BUG();
}
+ zcache_put_pool(pool);
out:
return ret;
}
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 21+ messages in thread* [PATCH 03/10] staging: ramster: Provide accessory functions for counter increase
2013-04-10 0:25 Wanpeng Li
2013-04-10 0:25 ` [PATCH 01/10] staging: zcache: fix account foregin counters against zero-filled pages Wanpeng Li
2013-04-10 0:25 ` [PATCH 02/10] staging: zcache: remove zcache_freeze Wanpeng Li
@ 2013-04-10 0:25 ` Wanpeng Li
2013-04-10 0:25 ` [PATCH 04/10] staging: ramster: Provide accessory functions for counter decrease Wanpeng Li
` (6 subsequent siblings)
9 siblings, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:25 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
This patch enables these functions to be wrapped and
can disable/enable this with CONFIG_DEBUG_FS.
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/ramster/ramster.c | 34 ++++++++++++++++++++----------
1 file changed, 23 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/zcache/ramster/ramster.c b/drivers/staging/zcache/ramster/ramster.c
index 01fc672..b60e884 100644
--- a/drivers/staging/zcache/ramster/ramster.c
+++ b/drivers/staging/zcache/ramster/ramster.c
@@ -67,12 +67,32 @@ static int ramster_remote_target_nodenum __read_mostly = -1;
static long ramster_flnodes;
static atomic_t ramster_flnodes_atomic = ATOMIC_INIT(0);
static unsigned long ramster_flnodes_max;
+static inline void inc_ramster_flnodes(void)
+{
+ ramster_flnodes = atomic_inc_return(&ramster_flnodes_atomic);
+ if (ramster_flnodes > ramster_flnodes_max)
+ ramster_flnodes_max = ramster_flnodes;
+}
static ssize_t ramster_foreign_eph_pages;
static atomic_t ramster_foreign_eph_pages_atomic = ATOMIC_INIT(0);
static ssize_t ramster_foreign_eph_pages_max;
+static inline void inc_ramster_foreign_eph_pages(void)
+{
+ ramster_foreign_eph_pages = atomic_inc_return(
+ &ramster_foreign_eph_pages_atomic);
+ if (ramster_foreign_eph_pages > ramster_foreign_eph_pages_max)
+ ramster_foreign_eph_pages_max = ramster_foreign_eph_pages;
+}
static ssize_t ramster_foreign_pers_pages;
static atomic_t ramster_foreign_pers_pages_atomic = ATOMIC_INIT(0);
static ssize_t ramster_foreign_pers_pages_max;
+static inline void inc_ramster_foreign_pers_pages(void)
+{
+ ramster_foreign_pers_pages = atomic_inc_return(
+ &ramster_foreign_pers_pages_atomic);
+ if (ramster_foreign_pers_pages > ramster_foreign_pers_pages_max)
+ ramster_foreign_pers_pages_max = ramster_foreign_pers_pages;
+}
static ssize_t ramster_eph_pages_remoted;
static ssize_t ramster_pers_pages_remoted;
static ssize_t ramster_eph_pages_remote_failed;
@@ -159,9 +179,7 @@ static struct flushlist_node *ramster_flnode_alloc(struct tmem_pool *pool)
flnode = kp->flnode;
BUG_ON(flnode == NULL);
kp->flnode = NULL;
- ramster_flnodes = atomic_inc_return(&ramster_flnodes_atomic);
- if (ramster_flnodes > ramster_flnodes_max)
- ramster_flnodes_max = ramster_flnodes;
+ inc_ramster_flnodes();
return flnode;
}
@@ -471,10 +489,7 @@ void ramster_count_foreign_pages(bool eph, int count)
BUG_ON(count != 1 && count != -1);
if (eph) {
if (count > 0) {
- c = atomic_inc_return(
- &ramster_foreign_eph_pages_atomic);
- if (c > ramster_foreign_eph_pages_max)
- ramster_foreign_eph_pages_max = c;
+ inc_ramster_foreign_eph_pages();
} else {
c = atomic_dec_return(&ramster_foreign_eph_pages_atomic);
WARN_ON_ONCE(c < 0);
@@ -482,10 +497,7 @@ void ramster_count_foreign_pages(bool eph, int count)
ramster_foreign_eph_pages = c;
} else {
if (count > 0) {
- c = atomic_inc_return(
- &ramster_foreign_pers_pages_atomic);
- if (c > ramster_foreign_pers_pages_max)
- ramster_foreign_pers_pages_max = c;
+ inc_ramster_foreign_pers_pages();
} else {
c = atomic_dec_return(
&ramster_foreign_pers_pages_atomic);
--
1.7.10.4
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply related [flat|nested] 21+ messages in thread* [PATCH 04/10] staging: ramster: Provide accessory functions for counter decrease
2013-04-10 0:25 Wanpeng Li
` (2 preceding siblings ...)
2013-04-10 0:25 ` [PATCH 03/10] staging: ramster: Provide accessory functions for counter increase Wanpeng Li
@ 2013-04-10 0:25 ` Wanpeng Li
2013-04-10 0:25 ` [PATCH 05/10] staging: ramster: Move debugfs code out of ramster.c file Wanpeng Li
` (5 subsequent siblings)
9 siblings, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:25 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
This patch enables these functions to be wrapped and
can disable/enable this with CONFIG_DEBUG_FS.
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/ramster/ramster.c | 32 ++++++++++++++++++------------
1 file changed, 19 insertions(+), 13 deletions(-)
diff --git a/drivers/staging/zcache/ramster/ramster.c b/drivers/staging/zcache/ramster/ramster.c
index b60e884..c3d7f96 100644
--- a/drivers/staging/zcache/ramster/ramster.c
+++ b/drivers/staging/zcache/ramster/ramster.c
@@ -73,6 +73,10 @@ static inline void inc_ramster_flnodes(void)
if (ramster_flnodes > ramster_flnodes_max)
ramster_flnodes_max = ramster_flnodes;
}
+static inline void dec_ramster_flnodes(void)
+{
+ ramster_flnodes = atomic_dec_return(&ramster_flnodes_atomic);
+}
static ssize_t ramster_foreign_eph_pages;
static atomic_t ramster_foreign_eph_pages_atomic = ATOMIC_INIT(0);
static ssize_t ramster_foreign_eph_pages_max;
@@ -83,6 +87,11 @@ static inline void inc_ramster_foreign_eph_pages(void)
if (ramster_foreign_eph_pages > ramster_foreign_eph_pages_max)
ramster_foreign_eph_pages_max = ramster_foreign_eph_pages;
}
+static inline void dec_ramster_foreign_eph_pages(void)
+{
+ ramster_foreign_eph_pages = atomic_dec_return(
+ &ramster_foreign_eph_pages_atomic);
+}
static ssize_t ramster_foreign_pers_pages;
static atomic_t ramster_foreign_pers_pages_atomic = ATOMIC_INIT(0);
static ssize_t ramster_foreign_pers_pages_max;
@@ -93,6 +102,11 @@ static inline void inc_ramster_foreign_pers_pages(void)
if (ramster_foreign_pers_pages > ramster_foreign_pers_pages_max)
ramster_foreign_pers_pages_max = ramster_foreign_pers_pages;
}
+static inline void dec_ramster_foreign_pers_pages(void)
+{
+ ramster_foreign_pers_pages = atomic_dec_return(
+ &ramster_foreign_pers_pages_atomic);
+}
static ssize_t ramster_eph_pages_remoted;
static ssize_t ramster_pers_pages_remoted;
static ssize_t ramster_eph_pages_remote_failed;
@@ -188,10 +202,8 @@ static struct flushlist_node *ramster_flnode_alloc(struct tmem_pool *pool)
static void ramster_flnode_free(struct flushlist_node *flnode,
struct tmem_pool *pool)
{
- int flnodes;
-
- flnodes = atomic_dec_return(&ramster_flnodes_atomic);
- BUG_ON(flnodes < 0);
+ dec_ramster_flnodes();
+ BUG_ON(ramster_flnodes < 0);
kmem_cache_free(ramster_flnode_cache, flnode);
}
@@ -484,26 +496,20 @@ void *ramster_pampd_free(void *pampd, struct tmem_pool *pool,
void ramster_count_foreign_pages(bool eph, int count)
{
- int c;
-
BUG_ON(count != 1 && count != -1);
if (eph) {
if (count > 0) {
inc_ramster_foreign_eph_pages();
} else {
- c = atomic_dec_return(&ramster_foreign_eph_pages_atomic);
- WARN_ON_ONCE(c < 0);
+ dec_ramster_foreign_eph_pages();
+ WARN_ON_ONCE(ramster_foreign_eph_pages < 0);
}
- ramster_foreign_eph_pages = c;
} else {
if (count > 0) {
inc_ramster_foreign_pers_pages();
} else {
- c = atomic_dec_return(
- &ramster_foreign_pers_pages_atomic);
- WARN_ON_ONCE(c < 0);
+ WARN_ON_ONCE(ramster_foreign_pers_pages < 0);
}
- ramster_foreign_pers_pages = c;
}
}
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 21+ messages in thread* [PATCH 05/10] staging: ramster: Move debugfs code out of ramster.c file
2013-04-10 0:25 Wanpeng Li
` (3 preceding siblings ...)
2013-04-10 0:25 ` [PATCH 04/10] staging: ramster: Provide accessory functions for counter decrease Wanpeng Li
@ 2013-04-10 0:25 ` Wanpeng Li
2013-04-11 20:04 ` Greg Kroah-Hartman
2013-04-10 0:25 ` [PATCH 06/10] staging: ramster/debug: Use an array to initialize/use debugfs attributes Wanpeng Li
` (4 subsequent siblings)
9 siblings, 1 reply; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:25 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
Note that at this point there is no CONFIG_RAMSTER_DEBUG
option in the Kconfig. So in effect all of the counters
are nop until that option gets re-introduced in:
zcache/ramster/debug: Add RAMSTE_DEBUG Kconfig entry
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/Makefile | 1 +
drivers/staging/zcache/ramster/debug.c | 70 ++++++++++++++++++
drivers/staging/zcache/ramster/debug.h | 76 ++++++++++++++++++++
drivers/staging/zcache/ramster/ramster.c | 115 ++----------------------------
4 files changed, 152 insertions(+), 110 deletions(-)
create mode 100644 drivers/staging/zcache/ramster/debug.c
create mode 100644 drivers/staging/zcache/ramster/debug.h
diff --git a/drivers/staging/zcache/Makefile b/drivers/staging/zcache/Makefile
index 24fd6aa..7d48b1b 100644
--- a/drivers/staging/zcache/Makefile
+++ b/drivers/staging/zcache/Makefile
@@ -3,5 +3,6 @@ zcache-$(CONFIG_ZCACHE_DEBUG) += debug.o
zcache-$(CONFIG_RAMSTER) += ramster/ramster.o ramster/r2net.o
zcache-$(CONFIG_RAMSTER) += ramster/nodemanager.o ramster/tcp.o
zcache-$(CONFIG_RAMSTER) += ramster/heartbeat.o ramster/masklog.o
+zcache-$(CONFIG_RAMSTER_DEBUG) += ramster/debug.o
obj-$(CONFIG_ZCACHE) += zcache.o
diff --git a/drivers/staging/zcache/ramster/debug.c b/drivers/staging/zcache/ramster/debug.c
new file mode 100644
index 0000000..76861e4
--- /dev/null
+++ b/drivers/staging/zcache/ramster/debug.c
@@ -0,0 +1,70 @@
+#include <linux/atomic.h>
+#include "debug.h"
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#define zdfs debugfs_create_size_t
+#define zdfs64 debugfs_create_u64
+
+ssize_t ramster_eph_pages_remoted;
+ssize_t ramster_pers_pages_remoted;
+ssize_t ramster_eph_pages_remote_failed;
+ssize_t ramster_pers_pages_remote_failed;
+ssize_t ramster_remote_eph_pages_succ_get;
+ssize_t ramster_remote_pers_pages_succ_get;
+ssize_t ramster_remote_eph_pages_unsucc_get;
+ssize_t ramster_remote_pers_pages_unsucc_get;
+ssize_t ramster_pers_pages_remote_nomem;
+ssize_t ramster_remote_objects_flushed;
+ssize_t ramster_remote_object_flushes_failed;
+ssize_t ramster_remote_pages_flushed;
+ssize_t ramster_remote_page_flushes_failed;
+
+int __init ramster_debugfs_init(void)
+{
+ struct dentry *root = debugfs_create_dir("ramster", NULL);
+ if (root == NULL)
+ return -ENXIO;
+
+ zdfs("eph_pages_remoted", S_IRUGO, root, &ramster_eph_pages_remoted);
+ zdfs("pers_pages_remoted", S_IRUGO, root, &ramster_pers_pages_remoted);
+ zdfs("eph_pages_remote_failed", S_IRUGO, root,
+ &ramster_eph_pages_remote_failed);
+ zdfs("pers_pages_remote_failed", S_IRUGO, root,
+ &ramster_pers_pages_remote_failed);
+ zdfs("remote_eph_pages_succ_get", S_IRUGO, root,
+ &ramster_remote_eph_pages_succ_get);
+ zdfs("remote_pers_pages_succ_get", S_IRUGO, root,
+ &ramster_remote_pers_pages_succ_get);
+ zdfs("remote_eph_pages_unsucc_get", S_IRUGO, root,
+ &ramster_remote_eph_pages_unsucc_get);
+ zdfs("remote_pers_pages_unsucc_get", S_IRUGO, root,
+ &ramster_remote_pers_pages_unsucc_get);
+ zdfs("pers_pages_remote_nomem", S_IRUGO, root,
+ &ramster_pers_pages_remote_nomem);
+ zdfs("remote_objects_flushed", S_IRUGO, root,
+ &ramster_remote_objects_flushed);
+ zdfs("remote_pages_flushed", S_IRUGO, root,
+ &ramster_remote_pages_flushed);
+ zdfs("remote_object_flushes_failed", S_IRUGO, root,
+ &ramster_remote_object_flushes_failed);
+ zdfs("remote_page_flushes_failed", S_IRUGO, root,
+ &ramster_remote_page_flushes_failed);
+ zdfs("foreign_eph_pages", S_IRUGO, root,
+ &ramster_foreign_eph_pages);
+ zdfs("foreign_eph_pages_max", S_IRUGO, root,
+ &ramster_foreign_eph_pages_max);
+ zdfs("foreign_pers_pages", S_IRUGO, root,
+ &ramster_foreign_pers_pages);
+ zdfs("foreign_pers_pages_max", S_IRUGO, root,
+ &ramster_foreign_pers_pages_max);
+ return 0;
+}
+#undef zdebugfs
+#undef zdfs64
+#else
+static inline int ramster_debugfs_init(void)
+{
+ return 0;
+}
+#endif
diff --git a/drivers/staging/zcache/ramster/debug.h b/drivers/staging/zcache/ramster/debug.h
new file mode 100644
index 0000000..feba601
--- /dev/null
+++ b/drivers/staging/zcache/ramster/debug.h
@@ -0,0 +1,76 @@
+#ifdef CONFIG_RAMSTER_DEBUG
+
+extern long ramster_flnodes;
+static atomic_t ramster_flnodes_atomic = ATOMIC_INIT(0);
+extern unsigned long ramster_flnodes_max;
+static inline void inc_ramster_flnodes(void)
+{
+ ramster_flnodes = atomic_inc_return(&ramster_flnodes_atomic);
+ if (ramster_flnodes > ramster_flnodes_max)
+ ramster_flnodes_max = ramster_flnodes;
+}
+static inline void dec_ramster_flnodes(void)
+{
+ ramster_flnodes = atomic_dec_return(&ramster_flnodes_atomic);
+}
+extern ssize_t ramster_foreign_eph_pages;
+static atomic_t ramster_foreign_eph_pages_atomic = ATOMIC_INIT(0);
+extern ssize_t ramster_foreign_eph_pages_max;
+static inline void inc_ramster_foreign_eph_pages(void)
+{
+ ramster_foreign_eph_pages = atomic_inc_return(
+ &ramster_foreign_eph_pages_atomic);
+ if (ramster_foreign_eph_pages > ramster_foreign_eph_pages_max)
+ ramster_foreign_eph_pages_max = ramster_foreign_eph_pages;
+}
+static inline void dec_ramster_foreign_eph_pages(void)
+{
+ ramster_foreign_eph_pages = atomic_dec_return(
+ &ramster_foreign_eph_pages_atomic);
+}
+extern ssize_t ramster_foreign_pers_pages;
+static atomic_t ramster_foreign_pers_pages_atomic = ATOMIC_INIT(0);
+extern ssize_t ramster_foreign_pers_pages_max;
+static inline void inc_ramster_foreign_pers_pages(void)
+{
+ ramster_foreign_pers_pages = atomic_inc_return(
+ &ramster_foreign_pers_pages_atomic);
+ if (ramster_foreign_pers_pages > ramster_foreign_pers_pages_max)
+ ramster_foreign_pers_pages_max = ramster_foreign_pers_pages;
+}
+static inline void dec_ramster_foreign_pers_pages(void)
+{
+ ramster_foreign_pers_pages = atomic_dec_return(
+ &ramster_foreign_pers_pages_atomic);
+}
+
+extern ssize_t ramster_eph_pages_remoted;
+extern ssize_t ramster_pers_pages_remoted;
+extern ssize_t ramster_eph_pages_remote_failed;
+extern ssize_t ramster_pers_pages_remote_failed;
+extern ssize_t ramster_remote_eph_pages_succ_get;
+extern ssize_t ramster_remote_pers_pages_succ_get;
+extern ssize_t ramster_remote_eph_pages_unsucc_get;
+extern ssize_t ramster_remote_pers_pages_unsucc_get;
+extern ssize_t ramster_pers_pages_remote_nomem;
+extern ssize_t ramster_remote_objects_flushed;
+extern ssize_t ramster_remote_object_flushes_failed;
+extern ssize_t ramster_remote_pages_flushed;
+extern ssize_t ramster_remote_page_flushes_failed;
+
+int ramster_debugfs_init(void);
+
+#else
+
+static inline void inc_ramster_flnodes(void) { };
+static inline void dec_ramster_flnodes(void) { };
+static inline void inc_ramster_foreign_eph_pages(void) { };
+static inline void dec_ramster_foreign_eph_pages(void) { };
+static inline void inc_ramster_foreign_pers_pages(void) { };
+static inline void dec_ramster_foreign_pers_pages(void) { };
+
+static inline int ramster_debugfs_init(void)
+{
+ return 0;
+}
+#endif
diff --git a/drivers/staging/zcache/ramster/ramster.c b/drivers/staging/zcache/ramster/ramster.c
index c3d7f96..20ca3e8 100644
--- a/drivers/staging/zcache/ramster/ramster.c
+++ b/drivers/staging/zcache/ramster/ramster.c
@@ -42,6 +42,7 @@
#include "ramster.h"
#include "ramster_nodemanager.h"
#include "tcp.h"
+#include "debug.h"
#define RAMSTER_TESTING
@@ -63,118 +64,12 @@ static atomic_t ramster_remote_pers_pages = ATOMIC_INIT(0);
static bool ramster_nodes_manual_up[MANUAL_NODES] __read_mostly;
static int ramster_remote_target_nodenum __read_mostly = -1;
-/* these counters are made available via debugfs */
-static long ramster_flnodes;
-static atomic_t ramster_flnodes_atomic = ATOMIC_INIT(0);
-static unsigned long ramster_flnodes_max;
-static inline void inc_ramster_flnodes(void)
-{
- ramster_flnodes = atomic_inc_return(&ramster_flnodes_atomic);
- if (ramster_flnodes > ramster_flnodes_max)
- ramster_flnodes_max = ramster_flnodes;
-}
-static inline void dec_ramster_flnodes(void)
-{
- ramster_flnodes = atomic_dec_return(&ramster_flnodes_atomic);
-}
-static ssize_t ramster_foreign_eph_pages;
-static atomic_t ramster_foreign_eph_pages_atomic = ATOMIC_INIT(0);
-static ssize_t ramster_foreign_eph_pages_max;
-static inline void inc_ramster_foreign_eph_pages(void)
-{
- ramster_foreign_eph_pages = atomic_inc_return(
- &ramster_foreign_eph_pages_atomic);
- if (ramster_foreign_eph_pages > ramster_foreign_eph_pages_max)
- ramster_foreign_eph_pages_max = ramster_foreign_eph_pages;
-}
-static inline void dec_ramster_foreign_eph_pages(void)
-{
- ramster_foreign_eph_pages = atomic_dec_return(
- &ramster_foreign_eph_pages_atomic);
-}
-static ssize_t ramster_foreign_pers_pages;
-static atomic_t ramster_foreign_pers_pages_atomic = ATOMIC_INIT(0);
-static ssize_t ramster_foreign_pers_pages_max;
-static inline void inc_ramster_foreign_pers_pages(void)
-{
- ramster_foreign_pers_pages = atomic_inc_return(
- &ramster_foreign_pers_pages_atomic);
- if (ramster_foreign_pers_pages > ramster_foreign_pers_pages_max)
- ramster_foreign_pers_pages_max = ramster_foreign_pers_pages;
-}
-static inline void dec_ramster_foreign_pers_pages(void)
-{
- ramster_foreign_pers_pages = atomic_dec_return(
- &ramster_foreign_pers_pages_atomic);
-}
-static ssize_t ramster_eph_pages_remoted;
-static ssize_t ramster_pers_pages_remoted;
-static ssize_t ramster_eph_pages_remote_failed;
-static ssize_t ramster_pers_pages_remote_failed;
-static ssize_t ramster_remote_eph_pages_succ_get;
-static ssize_t ramster_remote_pers_pages_succ_get;
-static ssize_t ramster_remote_eph_pages_unsucc_get;
-static ssize_t ramster_remote_pers_pages_unsucc_get;
-static ssize_t ramster_pers_pages_remote_nomem;
-static ssize_t ramster_remote_objects_flushed;
-static ssize_t ramster_remote_object_flushes_failed;
-static ssize_t ramster_remote_pages_flushed;
-static ssize_t ramster_remote_page_flushes_failed;
+/* Used by this code. */
+long ramster_flnodes;
+ssize_t ramster_foreign_eph_pages;
+ssize_t ramster_foreign_pers_pages;
/* FIXME frontswap selfshrinking knobs in debugfs? */
-#ifdef CONFIG_DEBUG_FS
-#include <linux/debugfs.h>
-#define zdfs debugfs_create_size_t
-#define zdfs64 debugfs_create_u64
-static int __init ramster_debugfs_init(void)
-{
- struct dentry *root = debugfs_create_dir("ramster", NULL);
- if (root == NULL)
- return -ENXIO;
-
- zdfs("eph_pages_remoted", S_IRUGO, root, &ramster_eph_pages_remoted);
- zdfs("pers_pages_remoted", S_IRUGO, root, &ramster_pers_pages_remoted);
- zdfs("eph_pages_remote_failed", S_IRUGO, root,
- &ramster_eph_pages_remote_failed);
- zdfs("pers_pages_remote_failed", S_IRUGO, root,
- &ramster_pers_pages_remote_failed);
- zdfs("remote_eph_pages_succ_get", S_IRUGO, root,
- &ramster_remote_eph_pages_succ_get);
- zdfs("remote_pers_pages_succ_get", S_IRUGO, root,
- &ramster_remote_pers_pages_succ_get);
- zdfs("remote_eph_pages_unsucc_get", S_IRUGO, root,
- &ramster_remote_eph_pages_unsucc_get);
- zdfs("remote_pers_pages_unsucc_get", S_IRUGO, root,
- &ramster_remote_pers_pages_unsucc_get);
- zdfs("pers_pages_remote_nomem", S_IRUGO, root,
- &ramster_pers_pages_remote_nomem);
- zdfs("remote_objects_flushed", S_IRUGO, root,
- &ramster_remote_objects_flushed);
- zdfs("remote_pages_flushed", S_IRUGO, root,
- &ramster_remote_pages_flushed);
- zdfs("remote_object_flushes_failed", S_IRUGO, root,
- &ramster_remote_object_flushes_failed);
- zdfs("remote_page_flushes_failed", S_IRUGO, root,
- &ramster_remote_page_flushes_failed);
- zdfs("foreign_eph_pages", S_IRUGO, root,
- &ramster_foreign_eph_pages);
- zdfs("foreign_eph_pages_max", S_IRUGO, root,
- &ramster_foreign_eph_pages_max);
- zdfs("foreign_pers_pages", S_IRUGO, root,
- &ramster_foreign_pers_pages);
- zdfs("foreign_pers_pages_max", S_IRUGO, root,
- &ramster_foreign_pers_pages_max);
- return 0;
-}
-#undef zdebugfs
-#undef zdfs64
-#else
-static inline int ramster_debugfs_init(void)
-{
- return 0;
-}
-#endif
-
static LIST_HEAD(ramster_rem_op_list);
static DEFINE_SPINLOCK(ramster_rem_op_list_lock);
static DEFINE_PER_CPU(struct ramster_preload, ramster_preloads);
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 21+ messages in thread* Re: [PATCH 05/10] staging: ramster: Move debugfs code out of ramster.c file
2013-04-10 0:25 ` [PATCH 05/10] staging: ramster: Move debugfs code out of ramster.c file Wanpeng Li
@ 2013-04-11 20:04 ` Greg Kroah-Hartman
2013-04-11 23:27 ` Wanpeng Li
2013-04-11 23:27 ` Wanpeng Li
0 siblings, 2 replies; 21+ messages in thread
From: Greg Kroah-Hartman @ 2013-04-11 20:04 UTC (permalink / raw)
To: Wanpeng Li
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu
On Wed, Apr 10, 2013 at 08:25:55AM +0800, Wanpeng Li wrote:
> Note that at this point there is no CONFIG_RAMSTER_DEBUG
> option in the Kconfig. So in effect all of the counters
> are nop until that option gets re-introduced in:
> zcache/ramster/debug: Add RAMSTE_DEBUG Kconfig entry
This patch breaks the build badly:
drivers/staging/zcache/ramster/ramster.c: In function a??ramster_localifya??:
drivers/staging/zcache/ramster/ramster.c:159:4: error: a??ramster_remote_eph_pages_unsucc_geta?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c:159:4: note: each undeclared identifier is reported only once for each function it appears in
drivers/staging/zcache/ramster/ramster.c:161:4: error: a??ramster_remote_pers_pages_unsucc_geta?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c:212:3: error: a??ramster_remote_eph_pages_succ_geta?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c:214:3: error: a??ramster_remote_pers_pages_succ_geta?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c: In function a??ramster_pampd_repatriate_preloada??:
drivers/staging/zcache/ramster/ramster.c:299:3: error: a??ramster_pers_pages_remote_nomema?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c: In function a??ramster_remote_flush_pagea??:
drivers/staging/zcache/ramster/ramster.c:437:3: error: a??ramster_remote_pages_flusheda?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c:439:3: error: a??ramster_remote_page_flushes_faileda?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c: In function a??ramster_remote_flush_objecta??:
drivers/staging/zcache/ramster/ramster.c:454:3: error: a??ramster_remote_objects_flusheda?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c:456:3: error: a??ramster_remote_object_flushes_faileda?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c: In function a??ramster_remotify_pageframea??:
drivers/staging/zcache/ramster/ramster.c:507:5: error: a??ramster_eph_pages_remote_faileda?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c:509:5: error: a??ramster_pers_pages_remote_faileda?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c:516:4: error: a??ramster_eph_pages_remoteda?? undeclared (first use in this function)
drivers/staging/zcache/ramster/ramster.c:518:4: error: a??ramster_pers_pages_remoteda?? undeclared (first use in this function)
make[3]: *** [drivers/staging/zcache/ramster/ramster.o] Error 1
Please always test your patches.
I've applied patch 1, 3, and 4 in this series. Please fix this up if you want
me to apply anything else.
greg k-h
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 05/10] staging: ramster: Move debugfs code out of ramster.c file
2013-04-11 20:04 ` Greg Kroah-Hartman
@ 2013-04-11 23:27 ` Wanpeng Li
2013-04-11 23:27 ` Wanpeng Li
1 sibling, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-11 23:27 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu
On Thu, Apr 11, 2013 at 01:04:28PM -0700, Greg Kroah-Hartman wrote:
>On Wed, Apr 10, 2013 at 08:25:55AM +0800, Wanpeng Li wrote:
>> Note that at this point there is no CONFIG_RAMSTER_DEBUG
>> option in the Kconfig. So in effect all of the counters
>> are nop until that option gets re-introduced in:
>> zcache/ramster/debug: Add RAMSTE_DEBUG Kconfig entry
>
>This patch breaks the build badly:
>
>drivers/staging/zcache/ramster/ramster.c: In function ‘ramster_localify’:
>drivers/staging/zcache/ramster/ramster.c:159:4: error: ‘ramster_remote_eph_pages_unsucc_get’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:159:4: note: each undeclared identifier is reported only once for each function it appears in
>drivers/staging/zcache/ramster/ramster.c:161:4: error: ‘ramster_remote_pers_pages_unsucc_get’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:212:3: error: ‘ramster_remote_eph_pages_succ_get’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:214:3: error: ‘ramster_remote_pers_pages_succ_get’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c: In function ‘ramster_pampd_repatriate_preload’:
>drivers/staging/zcache/ramster/ramster.c:299:3: error: ‘ramster_pers_pages_remote_nomem’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c: In function ‘ramster_remote_flush_page’:
>drivers/staging/zcache/ramster/ramster.c:437:3: error: ‘ramster_remote_pages_flushed’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:439:3: error: ‘ramster_remote_page_flushes_failed’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c: In function ‘ramster_remote_flush_object’:
>drivers/staging/zcache/ramster/ramster.c:454:3: error: ‘ramster_remote_objects_flushed’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:456:3: error: ‘ramster_remote_object_flushes_failed’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c: In function ‘ramster_remotify_pageframe’:
>drivers/staging/zcache/ramster/ramster.c:507:5: error: ‘ramster_eph_pages_remote_failed’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:509:5: error: ‘ramster_pers_pages_remote_failed’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:516:4: error: ‘ramster_eph_pages_remoted’ undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:518:4: error: ‘ramster_pers_pages_remoted’ undeclared (first use in this function)
>make[3]: *** [drivers/staging/zcache/ramster/ramster.o] Error 1
>
>Please always test your patches.
>
>I've applied patch 1, 3, and 4 in this series. Please fix this up if you want
>me to apply anything else.
Sorry for the bisect issue in my patchset, I will fix it and repost
ASAP. Thanks for your patient.
Regards,
Wanpeng Li
>
>greg k-h
>
>--
>To unsubscribe, send a message with 'unsubscribe linux-mm' in
>the body to majordomo@kvack.org. For more info on Linux MM,
>see: http://www.linux-mm.org/ .
>Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
--
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^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 05/10] staging: ramster: Move debugfs code out of ramster.c file
2013-04-11 20:04 ` Greg Kroah-Hartman
2013-04-11 23:27 ` Wanpeng Li
@ 2013-04-11 23:27 ` Wanpeng Li
1 sibling, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-11 23:27 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu
On Thu, Apr 11, 2013 at 01:04:28PM -0700, Greg Kroah-Hartman wrote:
>On Wed, Apr 10, 2013 at 08:25:55AM +0800, Wanpeng Li wrote:
>> Note that at this point there is no CONFIG_RAMSTER_DEBUG
>> option in the Kconfig. So in effect all of the counters
>> are nop until that option gets re-introduced in:
>> zcache/ramster/debug: Add RAMSTE_DEBUG Kconfig entry
>
>This patch breaks the build badly:
>
>drivers/staging/zcache/ramster/ramster.c: In function a??ramster_localifya??:
>drivers/staging/zcache/ramster/ramster.c:159:4: error: a??ramster_remote_eph_pages_unsucc_geta?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:159:4: note: each undeclared identifier is reported only once for each function it appears in
>drivers/staging/zcache/ramster/ramster.c:161:4: error: a??ramster_remote_pers_pages_unsucc_geta?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:212:3: error: a??ramster_remote_eph_pages_succ_geta?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:214:3: error: a??ramster_remote_pers_pages_succ_geta?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c: In function a??ramster_pampd_repatriate_preloada??:
>drivers/staging/zcache/ramster/ramster.c:299:3: error: a??ramster_pers_pages_remote_nomema?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c: In function a??ramster_remote_flush_pagea??:
>drivers/staging/zcache/ramster/ramster.c:437:3: error: a??ramster_remote_pages_flusheda?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:439:3: error: a??ramster_remote_page_flushes_faileda?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c: In function a??ramster_remote_flush_objecta??:
>drivers/staging/zcache/ramster/ramster.c:454:3: error: a??ramster_remote_objects_flusheda?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:456:3: error: a??ramster_remote_object_flushes_faileda?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c: In function a??ramster_remotify_pageframea??:
>drivers/staging/zcache/ramster/ramster.c:507:5: error: a??ramster_eph_pages_remote_faileda?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:509:5: error: a??ramster_pers_pages_remote_faileda?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:516:4: error: a??ramster_eph_pages_remoteda?? undeclared (first use in this function)
>drivers/staging/zcache/ramster/ramster.c:518:4: error: a??ramster_pers_pages_remoteda?? undeclared (first use in this function)
>make[3]: *** [drivers/staging/zcache/ramster/ramster.o] Error 1
>
>Please always test your patches.
>
>I've applied patch 1, 3, and 4 in this series. Please fix this up if you want
>me to apply anything else.
Sorry for the bisect issue in my patchset, I will fix it and repost
ASAP. Thanks for your patient.
Regards,
Wanpeng Li
>
>greg k-h
>
>--
>To unsubscribe, send a message with 'unsubscribe linux-mm' in
>the body to majordomo@kvack.org. For more info on Linux MM,
>see: http://www.linux-mm.org/ .
>Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
--
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^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 06/10] staging: ramster/debug: Use an array to initialize/use debugfs attributes
2013-04-10 0:25 Wanpeng Li
` (4 preceding siblings ...)
2013-04-10 0:25 ` [PATCH 05/10] staging: ramster: Move debugfs code out of ramster.c file Wanpeng Li
@ 2013-04-10 0:25 ` Wanpeng Li
2013-04-10 0:25 ` [PATCH 07/10] staging: ramster/debug: Add RAMSTER_DEBUG Kconfig entry Wanpeng Li
` (3 subsequent siblings)
9 siblings, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:25 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
Use an array to initialize/use debugfs attributes, it makes them
neater as zcache/debug.c does.
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/ramster/debug.c | 68 +++++++++++++++-----------------
1 file changed, 32 insertions(+), 36 deletions(-)
diff --git a/drivers/staging/zcache/ramster/debug.c b/drivers/staging/zcache/ramster/debug.c
index 76861e4..bf34133 100644
--- a/drivers/staging/zcache/ramster/debug.c
+++ b/drivers/staging/zcache/ramster/debug.c
@@ -3,8 +3,6 @@
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
-#define zdfs debugfs_create_size_t
-#define zdfs64 debugfs_create_u64
ssize_t ramster_eph_pages_remoted;
ssize_t ramster_pers_pages_remoted;
@@ -20,48 +18,46 @@ ssize_t ramster_remote_object_flushes_failed;
ssize_t ramster_remote_pages_flushed;
ssize_t ramster_remote_page_flushes_failed;
+#define ATTR(x) { .name = #x, .val = &ramster_##x, }
+static struct debug_entry {
+ const char *name;
+ ssize_t *val;
+} attrs[] = {
+ ATTR(eph_pages_remoted),
+ ATTR(pers_pages_remoted),
+ ATTR(eph_pages_remote_failed),
+ ATTR(pers_pages_remote_failed),
+ ATTR(remote_eph_pages_succ_get),
+ ATTR(remote_pers_pages_succ_get),
+ ATTR(remote_eph_pages_unsucc_get),
+ ATTR(remote_pers_pages_unsucc_get),
+ ATTR(pers_pages_remote_nomem),
+ ATTR(remote_objects_flushed),
+ ATTR(remote_pages_flushed),
+ ATTR(remote_object_flushes_failed),
+ ATTR(remote_page_flushes_failed),
+ ATTR(foreign_eph_pages),
+ ATTR(foreign_eph_pages_max),
+ ATTR(foreign_pers_pages),
+ ATTR(foreign_pers_pages_max),
+};
+#undef ATTR
+
int __init ramster_debugfs_init(void)
{
+ int i;
struct dentry *root = debugfs_create_dir("ramster", NULL);
if (root == NULL)
return -ENXIO;
- zdfs("eph_pages_remoted", S_IRUGO, root, &ramster_eph_pages_remoted);
- zdfs("pers_pages_remoted", S_IRUGO, root, &ramster_pers_pages_remoted);
- zdfs("eph_pages_remote_failed", S_IRUGO, root,
- &ramster_eph_pages_remote_failed);
- zdfs("pers_pages_remote_failed", S_IRUGO, root,
- &ramster_pers_pages_remote_failed);
- zdfs("remote_eph_pages_succ_get", S_IRUGO, root,
- &ramster_remote_eph_pages_succ_get);
- zdfs("remote_pers_pages_succ_get", S_IRUGO, root,
- &ramster_remote_pers_pages_succ_get);
- zdfs("remote_eph_pages_unsucc_get", S_IRUGO, root,
- &ramster_remote_eph_pages_unsucc_get);
- zdfs("remote_pers_pages_unsucc_get", S_IRUGO, root,
- &ramster_remote_pers_pages_unsucc_get);
- zdfs("pers_pages_remote_nomem", S_IRUGO, root,
- &ramster_pers_pages_remote_nomem);
- zdfs("remote_objects_flushed", S_IRUGO, root,
- &ramster_remote_objects_flushed);
- zdfs("remote_pages_flushed", S_IRUGO, root,
- &ramster_remote_pages_flushed);
- zdfs("remote_object_flushes_failed", S_IRUGO, root,
- &ramster_remote_object_flushes_failed);
- zdfs("remote_page_flushes_failed", S_IRUGO, root,
- &ramster_remote_page_flushes_failed);
- zdfs("foreign_eph_pages", S_IRUGO, root,
- &ramster_foreign_eph_pages);
- zdfs("foreign_eph_pages_max", S_IRUGO, root,
- &ramster_foreign_eph_pages_max);
- zdfs("foreign_pers_pages", S_IRUGO, root,
- &ramster_foreign_pers_pages);
- zdfs("foreign_pers_pages_max", S_IRUGO, root,
- &ramster_foreign_pers_pages_max);
+ for (i = 0; i < ARRAY_SIZE(attrs); i++)
+ if (!debugfs_create_size_t(attrs[i].name,
+ S_IRUGO, root, attrs[i].val))
+ goto out;
return 0;
+out:
+ return -ENODEV;
}
-#undef zdebugfs
-#undef zdfs64
#else
static inline int ramster_debugfs_init(void)
{
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 21+ messages in thread* [PATCH 07/10] staging: ramster/debug: Add RAMSTER_DEBUG Kconfig entry
2013-04-10 0:25 Wanpeng Li
` (5 preceding siblings ...)
2013-04-10 0:25 ` [PATCH 06/10] staging: ramster/debug: Use an array to initialize/use debugfs attributes Wanpeng Li
@ 2013-04-10 0:25 ` Wanpeng Li
2013-04-10 0:25 ` [PATCH 08/10] staging: ramster: Add incremental accessory counters Wanpeng Li
` (2 subsequent siblings)
9 siblings, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:25 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
Add RAMSTER_DEBUG Kconfig entry.
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/Kconfig | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/staging/zcache/Kconfig b/drivers/staging/zcache/Kconfig
index c3b8a10..05e87a1 100644
--- a/drivers/staging/zcache/Kconfig
+++ b/drivers/staging/zcache/Kconfig
@@ -33,6 +33,14 @@ config RAMSTER
zcache2, compresses swap pages into local RAM, but then remotifies
the compressed pages to another node in the RAMster cluster.
+config RAMSTER_DEBUG
+ bool "Enable ramster debug statistics"
+ depends on DEBUG_FS && RAMSTER
+ default n
+ help
+ This is used to provide an debugfs directory with counters of
+ how ramster is doing. You probably want to set this to 'N'.
+
# Depends on not-yet-upstreamed mm patches to export end_swap_bio_write and
# __add_to_swap_cache, and implement __swap_writepage (which is swap_writepage
# without the frontswap call. When these are in-tree, the dependency on
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 21+ messages in thread* [PATCH 08/10] staging: ramster: Add incremental accessory counters
2013-04-10 0:25 Wanpeng Li
` (6 preceding siblings ...)
2013-04-10 0:25 ` [PATCH 07/10] staging: ramster/debug: Add RAMSTER_DEBUG Kconfig entry Wanpeng Li
@ 2013-04-10 0:25 ` Wanpeng Li
2013-04-10 0:25 ` [PATCH 09/10] staging: zcache/debug: fix coding style Wanpeng Li
2013-04-10 0:26 ` [PATCH 10/10] staging: ramster: add how-to for ramster Wanpeng Li
9 siblings, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:25 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
Add incremental accessory counters that are going to be used for
debug fs entries.
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/ramster/debug.h | 28 ++++++++++++++++++++++++++
drivers/staging/zcache/ramster/ramster.c | 32 +++++++++++++++---------------
2 files changed, 44 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/zcache/ramster/debug.h b/drivers/staging/zcache/ramster/debug.h
index feba601..633f05c 100644
--- a/drivers/staging/zcache/ramster/debug.h
+++ b/drivers/staging/zcache/ramster/debug.h
@@ -60,6 +60,20 @@ extern ssize_t ramster_remote_page_flushes_failed;
int ramster_debugfs_init(void);
+static inline void inc_ramster_eph_pages_remoted(void) { ramster_eph_pages_remoted++; };
+static inline void inc_ramster_pers_pages_remoted(void) { ramster_pers_pages_remoted++; };
+static inline void inc_ramster_eph_pages_remote_failed(void) { ramster_eph_pages_remote_failed++; };
+static inline void inc_ramster_pers_pages_remote_failed(void) { ramster_pers_pages_remote_failed++; };
+static inline void inc_ramster_remote_eph_pages_succ_get(void) { ramster_remote_eph_pages_succ_get++; };
+static inline void inc_ramster_remote_pers_pages_succ_get(void) { ramster_remote_pers_pages_succ_get++; };
+static inline void inc_ramster_remote_eph_pages_unsucc_get(void) { ramster_remote_eph_pages_unsucc_get++; };
+static inline void inc_ramster_remote_pers_pages_unsucc_get(void) { ramster_remote_pers_pages_unsucc_get++; };
+static inline void inc_ramster_pers_pages_remote_nomem(void) { ramster_pers_pages_remote_nomem++; };
+static inline void inc_ramster_remote_objects_flushed(void) { ramster_remote_objects_flushed++; };
+static inline void inc_ramster_remote_object_flushes_failed(void) { ramster_remote_object_flushes_failed++; };
+static inline void inc_ramster_remote_pages_flushed(void) { ramster_remote_pages_flushed++; };
+static inline void inc_ramster_remote_page_flushes_failed(void) { ramster_remote_page_flushes_failed++; };
+
#else
static inline void inc_ramster_flnodes(void) { };
@@ -69,6 +83,20 @@ static inline void dec_ramster_foreign_eph_pages(void) { };
static inline void inc_ramster_foreign_pers_pages(void) { };
static inline void dec_ramster_foreign_pers_pages(void) { };
+static inline void inc_ramster_eph_pages_remoted(void) { };
+static inline void inc_ramster_pers_pages_remoted(void) { };
+static inline void inc_ramster_eph_pages_remote_failed(void) { };
+static inline void inc_ramster_pers_pages_remote_failed(void) { };
+static inline void inc_ramster_remote_eph_pages_succ_get(void) { };
+static inline void inc_ramster_remote_pers_pages_succ_get(void) { };
+static inline void inc_ramster_remote_eph_pages_unsucc_get(void) { };
+static inline void inc_ramster_remote_pers_pages_unsucc_get(void) { };
+static inline void inc_ramster_pers_pages_remote_nomem(void) { };
+static inline void inc_ramster_remote_objects_flushed(void) { };
+static inline void inc_ramster_remote_object_flushes_failed(void) { };
+static inline void inc_ramster_remote_pages_flushed(void) { };
+static inline void inc_ramster_remote_page_flushes_failed(void) { };
+
static inline int ramster_debugfs_init(void)
{
return 0;
diff --git a/drivers/staging/zcache/ramster/ramster.c b/drivers/staging/zcache/ramster/ramster.c
index 20ca3e8..89266a0 100644
--- a/drivers/staging/zcache/ramster/ramster.c
+++ b/drivers/staging/zcache/ramster/ramster.c
@@ -156,9 +156,9 @@ int ramster_localify(int pool_id, struct tmem_oid *oidp, uint32_t index,
pr_err("UNTESTED pampd==NULL in ramster_localify\n");
#endif
if (eph)
- ramster_remote_eph_pages_unsucc_get++;
+ inc_ramster_remote_eph_pages_unsucc_get();
else
- ramster_remote_pers_pages_unsucc_get++;
+ inc_ramster_remote_pers_pages_unsucc_get();
obj = NULL;
goto finish;
} else if (unlikely(!pampd_is_remote(pampd))) {
@@ -167,9 +167,9 @@ int ramster_localify(int pool_id, struct tmem_oid *oidp, uint32_t index,
pr_err("UNTESTED dup while waiting in ramster_localify\n");
#endif
if (eph)
- ramster_remote_eph_pages_unsucc_get++;
+ inc_ramster_remote_eph_pages_unsucc_get();
else
- ramster_remote_pers_pages_unsucc_get++;
+ inc_ramster_remote_pers_pages_unsucc_get();
obj = NULL;
pampd = NULL;
ret = -EEXIST;
@@ -178,7 +178,7 @@ int ramster_localify(int pool_id, struct tmem_oid *oidp, uint32_t index,
/* no remote data, delete the local is_remote pampd */
pampd = NULL;
if (eph)
- ramster_remote_eph_pages_unsucc_get++;
+ inc_ramster_remote_eph_pages_unsucc_get();
else
BUG();
delete = true;
@@ -209,9 +209,9 @@ int ramster_localify(int pool_id, struct tmem_oid *oidp, uint32_t index,
BUG_ON(extra == NULL);
zcache_decompress_to_page(data, size, (struct page *)extra);
if (eph)
- ramster_remote_eph_pages_succ_get++;
+ inc_ramster_remote_eph_pages_succ_get();
else
- ramster_remote_pers_pages_succ_get++;
+ inc_ramster_remote_pers_pages_succ_get();
ret = 0;
finish:
tmem_localify_finish(obj, index, pampd, saved_hb, delete);
@@ -296,7 +296,7 @@ void *ramster_pampd_repatriate_preload(void *pampd, struct tmem_pool *pool,
c = atomic_dec_return(&ramster_remote_pers_pages);
WARN_ON_ONCE(c < 0);
} else {
- ramster_pers_pages_remote_nomem++;
+ inc_ramster_pers_pages_remote_nomem();
}
local_irq_restore(flags);
out:
@@ -434,9 +434,9 @@ static void ramster_remote_flush_page(struct flushlist_node *flnode)
remotenode = flnode->xh.client_id;
ret = r2net_remote_flush(xh, remotenode);
if (ret >= 0)
- ramster_remote_pages_flushed++;
+ inc_ramster_remote_pages_flushed();
else
- ramster_remote_page_flushes_failed++;
+ inc_ramster_remote_page_flushes_failed();
preempt_enable_no_resched();
ramster_flnode_free(flnode, NULL);
}
@@ -451,9 +451,9 @@ static void ramster_remote_flush_object(struct flushlist_node *flnode)
remotenode = flnode->xh.client_id;
ret = r2net_remote_flush_object(xh, remotenode);
if (ret >= 0)
- ramster_remote_objects_flushed++;
+ inc_ramster_remote_objects_flushed();
else
- ramster_remote_object_flushes_failed++;
+ inc_ramster_remote_object_flushes_failed();
preempt_enable_no_resched();
ramster_flnode_free(flnode, NULL);
}
@@ -504,18 +504,18 @@ int ramster_remotify_pageframe(bool eph)
* But count them so we know if it becomes a problem.
*/
if (eph)
- ramster_eph_pages_remote_failed++;
+ inc_ramster_eph_pages_remote_failed();
else
- ramster_pers_pages_remote_failed++;
+ inc_ramster_pers_pages_remote_failed();
break;
} else {
if (!eph)
atomic_inc(&ramster_remote_pers_pages);
}
if (eph)
- ramster_eph_pages_remoted++;
+ inc_ramster_eph_pages_remoted();
else
- ramster_pers_pages_remoted++;
+ inc_ramster_pers_pages_remoted();
/*
* data was successfully remoted so change the local version to
* point to the remote node where it landed
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 21+ messages in thread* [PATCH 09/10] staging: zcache/debug: fix coding style
2013-04-10 0:25 Wanpeng Li
` (7 preceding siblings ...)
2013-04-10 0:25 ` [PATCH 08/10] staging: ramster: Add incremental accessory counters Wanpeng Li
@ 2013-04-10 0:25 ` Wanpeng Li
2013-04-10 0:26 ` [PATCH 10/10] staging: ramster: add how-to for ramster Wanpeng Li
9 siblings, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:25 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
Fix coding style issue: ERROR: space prohibited before that '++' (ctx:WxO)
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/debug.h | 36 ++++++++++++++++++------------------
1 file changed, 18 insertions(+), 18 deletions(-)
diff --git a/drivers/staging/zcache/debug.h b/drivers/staging/zcache/debug.h
index ddad92f..08c9c7b5 100644
--- a/drivers/staging/zcache/debug.h
+++ b/drivers/staging/zcache/debug.h
@@ -174,26 +174,26 @@ extern ssize_t zcache_writtenback_pages;
extern ssize_t zcache_outstanding_writeback_pages;
#endif
-static inline void inc_zcache_flush_total(void) { zcache_flush_total ++; };
-static inline void inc_zcache_flush_found(void) { zcache_flush_found ++; };
-static inline void inc_zcache_flobj_total(void) { zcache_flobj_total ++; };
-static inline void inc_zcache_flobj_found(void) { zcache_flobj_found ++; };
-static inline void inc_zcache_failed_eph_puts(void) { zcach.e_failed_eph_puts ++; };
-static inline void inc_zcache_failed_pers_puts(void) { zcache_failed_pers_puts ++; };
-static inline void inc_zcache_failed_getfreepages(void) { zcache_failed_getfreepages ++; };
-static inline void inc_zcache_failed_alloc(void) { zcache_failed_alloc ++; };
-static inline void inc_zcache_put_to_flush(void) { zcache_put_to_flush ++; };
-static inline void inc_zcache_compress_poor(void) { zcache_compress_poor ++; };
-static inline void inc_zcache_mean_compress_poor(void) { zcache_mean_compress_poor ++; };
-static inline void inc_zcache_eph_ate_tail(void) { zcache_eph_ate_tail ++; };
-static inline void inc_zcache_eph_ate_tail_failed(void) { zcache_eph_ate_tail_failed ++; };
-static inline void inc_zcache_pers_ate_eph(void) { zcache_pers_ate_eph ++; };
-static inline void inc_zcache_pers_ate_eph_failed(void) { zcache_pers_ate_eph_failed ++; };
+static inline void inc_zcache_flush_total(void) { zcache_flush_total++; };
+static inline void inc_zcache_flush_found(void) { zcache_flush_found++; };
+static inline void inc_zcache_flobj_total(void) { zcache_flobj_total++; };
+static inline void inc_zcache_flobj_found(void) { zcache_flobj_found++; };
+static inline void inc_zcache_failed_eph_puts(void) { zcache_failed_eph_puts++; };
+static inline void inc_zcache_failed_pers_puts(void) { zcache_failed_pers_puts++; };
+static inline void inc_zcache_failed_getfreepages(void) { zcache_failed_getfreepages++; };
+static inline void inc_zcache_failed_alloc(void) { zcache_failed_alloc++; };
+static inline void inc_zcache_put_to_flush(void) { zcache_put_to_flush++; };
+static inline void inc_zcache_compress_poor(void) { zcache_compress_poor++; };
+static inline void inc_zcache_mean_compress_poor(void) { zcache_mean_compress_poor++; };
+static inline void inc_zcache_eph_ate_tail(void) { zcache_eph_ate_tail++; };
+static inline void inc_zcache_eph_ate_tail_failed(void) { zcache_eph_ate_tail_failed++; };
+static inline void inc_zcache_pers_ate_eph(void) { zcache_pers_ate_eph++; };
+static inline void inc_zcache_pers_ate_eph_failed(void) { zcache_pers_ate_eph_failed++; };
static inline void inc_zcache_evicted_eph_zpages(unsigned zpages) { zcache_evicted_eph_zpages += zpages; };
-static inline void inc_zcache_evicted_eph_pageframes(void) { zcache_evicted_eph_pageframes ++; };
+static inline void inc_zcache_evicted_eph_pageframes(void) { zcache_evicted_eph_pageframes++; };
-static inline void inc_zcache_eph_nonactive_puts_ignored(void) { zcache_eph_nonactive_puts_ignored ++; };
-static inline void inc_zcache_pers_nonactive_puts_ignored(void) { zcache_pers_nonactive_puts_ignored ++; };
+static inline void inc_zcache_eph_nonactive_puts_ignored(void) { zcache_eph_nonactive_puts_ignored++; };
+static inline void inc_zcache_pers_nonactive_puts_ignored(void) { zcache_pers_nonactive_puts_ignored++; };
int zcache_debugfs_init(void);
#else
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 21+ messages in thread* [PATCH 10/10] staging: ramster: add how-to for ramster
2013-04-10 0:25 Wanpeng Li
` (8 preceding siblings ...)
2013-04-10 0:25 ` [PATCH 09/10] staging: zcache/debug: fix coding style Wanpeng Li
@ 2013-04-10 0:26 ` Wanpeng Li
9 siblings, 0 replies; 21+ messages in thread
From: Wanpeng Li @ 2013-04-10 0:26 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Dan Magenheimer, Seth Jennings, Konrad Rzeszutek Wilk,
Minchan Kim, linux-mm, linux-kernel, Andrew Morton, Bob Liu,
Wanpeng Li
Add how-to for ramster.
Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
drivers/staging/zcache/ramster/HOWTO.txt | 257 ++++++++++++++++++++++++++++++
1 file changed, 257 insertions(+)
create mode 100644 drivers/staging/zcache/ramster/HOWTO.txt
diff --git a/drivers/staging/zcache/ramster/HOWTO.txt b/drivers/staging/zcache/ramster/HOWTO.txt
new file mode 100644
index 0000000..1f5cf01
--- /dev/null
+++ b/drivers/staging/zcache/ramster/HOWTO.txt
@@ -0,0 +1,257 @@
+Version: 130309
+ Dan Magenheimer <dan.magenheimer@oracle.com>
+
+This is a how-to document for RAMster. It applies to the March 9, 2013
+version of RAMster, re-merged with the new zcache codebase, built and tested
+on the 3.9 tree and submitted for the staging tree for 3.9.
+
+Note that this document was created from notes taken earlier. I would
+appreciate any feedback from anyone who follows the process as described
+to confirm that it works and to clarify any possible misunderstandings,
+or to report problems.
+
+A. PRELIMINARY
+
+1) Install two or more Linux systems that are known to work when upgraded
+ to a recent upstream Linux kernel version (e.g. v3.9). I used Oracle
+ Linux 6 ("OL6") on two Dell Optiplex 790s. Note that it should be possible
+ to use ocfs2 as a filesystem on your systems but this hasn't been
+ tested thoroughly, so if you do use ocfs2 and run into problems, please
+ report them. Up to eight nodes should work, but not much testing has
+ been done with more than three nodes.
+
+On each system:
+
+2) Configure, build and install then boot Linux (e.g. 3.9), just to ensure it
+ can be done with an unmodified upstream kernel. Confirm you booted
+ the upstream kernel with "uname -a".
+
+3) Install ramster-tools. The src.rpm and an OL6 rpm are available
+ in this directory. I'm not very good at userspace stuff and
+ would welcome any help in turning ramster-tools into more
+ distributable rpms/debs for a wider range of distros.
+
+B. BUILDING RAMSTER INTO THE KERNEL
+
+Do the following on each system:
+
+1) Ensure you have the new codebase for drivers/staging/zcache in your source.
+
+2) Change your .config to have:
+
+ CONFIG_CLEANCACHE=y
+ CONFIG_FRONTSWAP=y
+ CONFIG_STAGING=y
+ CONFIG_ZCACHE=y
+ CONFIG_RAMSTER=y
+
+ You may have to reconfigure your kernel multiple times to ensure
+ all of these are set properly. I use:
+
+ # yes "" | make oldconfig
+
+ and then manually check the .config file to ensure my selections
+ have "taken".
+
+ Do not bother to build the kernel until you are certain all of
+ the above config selections will stick for the build.
+
+3) Build this kernel and "make install" so that you have a new kernel
+ in /etc/grub.conf
+
+4) Add "ramster" to the kernel boot line in /etc/grub.conf.
+
+5) Reboot and check dmesg to ensure there are some messages from ramster
+ and that "ramster_enabled=1" appears.
+
+ # dmesg | grep ramster
+
+ You should also see a lot of files in:
+
+ # ls /sys/kernel/debug/zcache
+ # ls /sys/kernel/debug/ramster
+
+ and a few files in:
+
+ # ls /sys/kernel/mm/ramster
+
+ RAMster now will act as a single-system zcache but doesn't yet
+ know anything about the cluster so can't do anything remotely.
+
+C. BUILDING THE RAMSTER CLUSTER
+
+This is the error prone part unless you are a clustering expert. We need
+to describe the cluster in /etc/ramster.conf file and the init scripts
+that parse it are extremely picky about the syntax.
+
+1) Create the /etc/ramster.conf file and ensure it is identical
+ on both systems. There is a good amount of similar documentation
+ for ocfs2 /etc/cluster.conf that can be googled for this, but I use:
+
+ cluster:
+ name = ramster
+ node_count = 2
+ node:
+ name = system1
+ cluster = ramster
+ number = 0
+ ip_address = my.ip.ad.r1
+ ip_port = 7777
+ node:
+ name = system2
+ cluster = ramster
+ number = 0
+ ip_address = my.ip.ad.r2
+ ip_port = 7777
+
+ You must ensure that the "name" field in the file exactly matches
+ the output of "hostname" on each system. The following assumes
+ you use "ramster" as the name of your cluster.
+
+2) Enable the ramster service and configure it:
+
+ # chkconfig --add ramster
+ # service ramster configure
+
+ Set "load on boot" to "y", cluster to start is "ramster" (or whatever
+ name you chose in ramster.conf), heartbeat dead threshold as "500",
+ network idle timeout as "1000000". Leave the others as default.
+
+4) Reboot. After reboot, try:
+
+ # service ramster status
+
+ You should see "Checking ramster cluster ramster: Online". If you do
+ not, something is wrong and RAMster will not work. Note that you
+ should also see that the driver for "configfs" is loaded and mounted,
+ the driver for ocfs2_dlmfs is not loaded, and some numbers for network
+ parameters. You will also see "Checking ramster heartbeat: Not active".
+ That's all OK.
+
+5) Now you need to start the cluster heartbeat; the cluster is not "up"
+ until all nodes detect a heartbeat. Normally this is done via
+ a cluster filesystem, but you don't have one. Some hack-y
+ code in RAMster can start it for you though if you tell it what
+ nodes are "up". To enable it for nodes 0 and 1, do:
+
+ # echo 0 > /sys/kernel/mm/ramster/manual_node_up
+ # echo 1 > /sys/kernel/mm/ramster/manual_node_up
+
+ This must be done on ALL nodes. I usually put these lines
+ in /etc/rc.local as otherwise I forget. To confirm that
+ the cluster is now up, on both systems do:
+
+ # dmesg | grep ramster
+
+ You should see "Accepted connection" messages in dmesg after this.
+
+6) You must tell each node the node to which it should "remotify" pages.
+ For example if you have a three-node cluster and you want nodes
+ 1 and 2 to be "clients" and node 0 to be the "memory server", then
+ on nodes 1 and 2, you do:
+
+ # echo 0 > /sys/kernel/mm/ramster/remote_target_nodenum
+
+ You should see "ramster: node N set as remotification target"
+ in dmesg. Again, /etc/rc.local is a good place to put this
+ so you don't forget to do it at each boot.
+
+7) One more step: By default, the RAMster code does not "remotify" any
+ pages; this is primarily for testing purposes, but sometimes it is
+ useful. This may change in the future, but for now, you must:
+
+ # echo 1 > /sys/kernel/mm/ramster/pers_remotify_enable
+ # echo 1 > /sys/kernel/mm/ramster/eph_remotify_enable
+
+ The first enables remotifying swap (persistent, aka frontswap) pages,
+ the second enables remotifying of page cache (ephemeral, cleancache)
+ pages.
+
+ These lines can also be put in /etc/rc.local (AFTER the node_up
+ lines), or I often just put them at the beginning of my script that
+ runs a workload.
+
+8) Most testing has been done with both/all machines booted roughly
+ simultaneously. Ideally, you should do this too unless you are
+ trying to break RAMster rather than just use it. ;-)
+
+D. TESTING RAMSTER
+
+1) Note that RAMster has no value unless pages get "remotified". For
+ swap/frontswap/persistent pages, this doesn't happen unless/until
+ the workload would cause swapping to occur, at which point pages
+ are put into frontswap/zcache, and the remotification thread starts
+ working. To get to the point where the system swaps, you either
+ need a workload for which the working set exceeds the RAM in the
+ system; or you need to somehow reduce the amount of RAM one of
+ the system sees. This latter is easy when testing in a VM, but
+ harder on physical systems. In some cases, "mem=xxxM" on the
+ kernel command line restricts memory, but for some values of xxx
+ my kernel fails to boot. I may also try creating a fixed RAMdisk,
+ doing nothing with it, but ensuring that it eats up a fixed
+ amount of RAM.
+2) To see if RAMster is working, on the remote system, I do:
+
+ # watch -d 'cat /sys/kernel/debug/ramster/foreign_*'
+
+ to monitor the number (and max) ephemeral and persistent pages
+ that RAMster has sent. If these stay at 0, RAMster is not working
+ either because the workload isn't creating enough memory pressure
+ or because "remotifying" isn't working. On the system with the
+ workload, you can watch lots of useful information also, but beware
+ that you may be affecting the workload and performance. I use
+ # watch ./watchme
+ where the watchme file contains:
+
+ for i in /sys/kernel/debug/zcache/evicted_buddied_pages \
+ /sys/kernel/debug/zcache/evicted_raw_pages \
+ /sys/kernel/debug/zcache/evicted_unbuddied_pages \
+ /sys/kernel/debug/zcache/zbud_curr_raw_pages \
+ /sys/kernel/debug/zcache/zbud_curr_zbytes \
+ /sys/kernel/debug/zcache/zbud_curr_zpages \
+ /sys/kernel/debug/ramster/eph_pages_remoted \
+ /sys/kernel/debug/ramster/remote_eph_pages_succ_get \
+ /sys/kernel/debug/ramster/remote_pers_pages_succ_get \
+ /sys/kernel/debug/frontswap/succ_puts
+ do
+ echo $i ": " $(cat $i)
+ done
+ And if you have debugfs mounted (as /sys/kernel/debug), you can
+ add to the watchme script some interesting counters in
+ /sys/kernel/debug/cleancache/* and /sys/kernel/debug/frontswap/*
+
+3) In v4, there are known issues in counting certain values. As a result
+ you may see periodic warnings from the kernel. Almost always you
+ will see "ramster: bad accounting for XXX". There are also "WARN_ONCE"
+ messages. If you see kernel warnings with a tombstone, please report
+ them. They are harmless but reflect bugs that need to be eventually fixed.
+
+AUTOMATIC SWAP REPATRIATION
+
+You may notice that while the systems are idle, the foreign persistent
+page count on the remote machine slowly decreases. This is because
+RAMster implements "frontswap selfshrinking": When possible, swap
+pages that have been remotified are slowly repatriated to the local
+machine. This is so that local RAM can be used when possible and
+so that, in case of remote machine crash, the probability of loss
+of data is reduced.
+
+REBOOTING / POWEROFF
+
+If a system is shut down while some of its swap pages still reside
+on a remote system, the system may lock up partially through the shutdown
+sequence. This is because the network is shut down before the
+swap mechansim is shut down. To avoid this annoying problem, simply
+shut off the swap subsystem before starting the shutdown sequence, e.g.:
+
+ # swapoff -a
+ # reboot
+
+
+CHANGELOG:
+v5-120214->120817: updated for merge into new zcache codebase
+v4-120126->v5-120214: updated for V5
+111227->v4-120126: added info on selfshrinking and rebooting
+111227->v4-120126: added more info for tracking RAMster stats
+111227->v4-120126: CONFIG_PREEMPT_NONE no longer necessary
+111227->v4-120126: cleancache now works completely so no need to disable it
--
1.7.10.4
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