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Date: Tue, 1 Sep 2015 13:51:30 -0400
From: Mike Snitzer <snitzer@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, riel@...hat.com, david@...morbit.com,
axboe@...nel.dk, dm-devel@...hat.com, anderson@...hat.com
Subject: [PATCH 2/2] dm: disable slab merging for all DM slabs
It is useful to be able to observe DM's slab memory use by looking at
"dm_" named slabs in /proc/slabinfo without having to enable SLAB_DEBUG
options on production systems.
before:
$ cat /proc/slabinfo | grep dm_ | cut -d' ' -f1
dm_mpath_io
dm_uevent
dm_rq_target_io
after:
$ cat /proc/slabinfo | grep dm_ | cut -d' ' -f1
dm_thin_new_mapping
dm_mpath_io
dm_mq_policy_cache_entry
dm_cache_migration
dm_bio_prison_cell
dm_snap_pending_exception
dm_exception
dm_dirty_log_flush_entry
dm_kcopyd_job
dm_io
dm_uevent
dm_clone_request
dm_rq_target_io
dm_target_io
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
---
drivers/md/dm-bio-prison.c | 2 +-
drivers/md/dm-bufio.c | 2 +-
drivers/md/dm-cache-policy-mq.c | 2 +-
drivers/md/dm-cache-target.c | 3 +--
drivers/md/dm-io.c | 3 ++-
drivers/md/dm-kcopyd.c | 4 ++--
drivers/md/dm-log-userspace-base.c | 2 +-
drivers/md/dm-mpath.c | 3 +--
drivers/md/dm-snap.c | 4 ++--
drivers/md/dm-thin.c | 2 +-
drivers/md/dm-uevent.c | 2 +-
drivers/md/dm.c | 8 ++++----
12 files changed, 18 insertions(+), 19 deletions(-)
diff --git a/drivers/md/dm-bio-prison.c b/drivers/md/dm-bio-prison.c
index cd6d1d2..d033eee 100644
--- a/drivers/md/dm-bio-prison.c
+++ b/drivers/md/dm-bio-prison.c
@@ -398,7 +398,7 @@ EXPORT_SYMBOL_GPL(dm_deferred_set_add_work);
static int __init dm_bio_prison_init(void)
{
- _cell_cache = KMEM_CACHE(dm_bio_prison_cell, 0);
+ _cell_cache = KMEM_CACHE(dm_bio_prison_cell, SLAB_NO_MERGE);
if (!_cell_cache)
return -ENOMEM;
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 86dbbc7..1187470 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1636,7 +1636,7 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
if (!DM_BUFIO_CACHE(c)) {
DM_BUFIO_CACHE(c) = kmem_cache_create(DM_BUFIO_CACHE_NAME(c),
c->block_size,
- c->block_size, 0, NULL);
+ c->block_size, SLAB_NO_MERGE, NULL);
if (!DM_BUFIO_CACHE(c)) {
r = -ENOMEM;
mutex_unlock(&dm_bufio_clients_lock);
diff --git a/drivers/md/dm-cache-policy-mq.c b/drivers/md/dm-cache-policy-mq.c
index aa1b41c..ecc9f7d 100644
--- a/drivers/md/dm-cache-policy-mq.c
+++ b/drivers/md/dm-cache-policy-mq.c
@@ -1444,7 +1444,7 @@ static int __init mq_init(void)
mq_entry_cache = kmem_cache_create("dm_mq_policy_cache_entry",
sizeof(struct entry),
__alignof__(struct entry),
- 0, NULL);
+ SLAB_NO_MERGE, NULL);
if (!mq_entry_cache)
return -ENOMEM;
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index f9d9cc6..199fa437 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -394,7 +394,6 @@ static void wake_worker(struct cache *cache)
static struct dm_bio_prison_cell *alloc_prison_cell(struct cache *cache)
{
- /* FIXME: change to use a local slab. */
return dm_bio_prison_alloc_cell(cache->prison, GFP_NOWAIT);
}
@@ -3854,7 +3853,7 @@ static int __init dm_cache_init(void)
return r;
}
- migration_cache = KMEM_CACHE(dm_cache_migration, 0);
+ migration_cache = KMEM_CACHE(dm_cache_migration, SLAB_NO_MERGE);
if (!migration_cache) {
dm_unregister_target(&cache_target);
return -ENOMEM;
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 74adcd2..f7efeec 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -526,7 +526,8 @@ EXPORT_SYMBOL(dm_io);
int __init dm_io_init(void)
{
- _dm_io_cache = KMEM_CACHE(io, 0);
+ _dm_io_cache = kmem_cache_create("dm_io", sizeof(struct io),
+ __alignof__(struct io), SLAB_NO_MERGE, NULL);
if (!_dm_io_cache)
return -ENOMEM;
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index 3a7cade..f2a55a8 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -364,9 +364,9 @@ static struct kmem_cache *_job_cache;
int __init dm_kcopyd_init(void)
{
- _job_cache = kmem_cache_create("kcopyd_job",
+ _job_cache = kmem_cache_create("dm_kcopyd_job",
sizeof(struct kcopyd_job) * (SPLIT_COUNT + 1),
- __alignof__(struct kcopyd_job), 0, NULL);
+ __alignof__(struct kcopyd_job), SLAB_NO_MERGE, NULL);
if (!_job_cache)
return -ENOMEM;
diff --git a/drivers/md/dm-log-userspace-base.c b/drivers/md/dm-log-userspace-base.c
index 058256d..358c4e7 100644
--- a/drivers/md/dm-log-userspace-base.c
+++ b/drivers/md/dm-log-userspace-base.c
@@ -893,7 +893,7 @@ static int __init userspace_dirty_log_init(void)
{
int r = 0;
- _flush_entry_cache = KMEM_CACHE(dm_dirty_log_flush_entry, 0);
+ _flush_entry_cache = KMEM_CACHE(dm_dirty_log_flush_entry, SLAB_NO_MERGE);
if (!_flush_entry_cache) {
DMWARN("Unable to create flush_entry_cache: No memory.");
return -ENOMEM;
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index eff7bdd..00c52c0 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1727,8 +1727,7 @@ static int __init dm_multipath_init(void)
{
int r;
- /* allocate a slab for the dm_ios */
- _mpio_cache = KMEM_CACHE(dm_mpath_io, 0);
+ _mpio_cache = KMEM_CACHE(dm_mpath_io, SLAB_NO_MERGE);
if (!_mpio_cache)
return -ENOMEM;
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 3903d7a..99bb6cd 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -2441,14 +2441,14 @@ static int __init dm_snapshot_init(void)
goto bad_origin_hash;
}
- exception_cache = KMEM_CACHE(dm_exception, 0);
+ exception_cache = KMEM_CACHE(dm_exception, SLAB_NO_MERGE);
if (!exception_cache) {
DMERR("Couldn't create exception cache.");
r = -ENOMEM;
goto bad_exception_cache;
}
- pending_cache = KMEM_CACHE(dm_snap_pending_exception, 0);
+ pending_cache = KMEM_CACHE(dm_snap_pending_exception, SLAB_NO_MERGE);
if (!pending_cache) {
DMERR("Couldn't create pending cache.");
r = -ENOMEM;
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 49e358a..7de7e81 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -4314,7 +4314,7 @@ static int __init dm_thin_init(void)
r = -ENOMEM;
- _new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, 0);
+ _new_mapping_cache = KMEM_CACHE(dm_thin_new_mapping, SLAB_NO_MERGE);
if (!_new_mapping_cache)
goto bad_new_mapping_cache;
diff --git a/drivers/md/dm-uevent.c b/drivers/md/dm-uevent.c
index 8efe033..2db0880 100644
--- a/drivers/md/dm-uevent.c
+++ b/drivers/md/dm-uevent.c
@@ -204,7 +204,7 @@ EXPORT_SYMBOL_GPL(dm_path_uevent);
int dm_uevent_init(void)
{
- _dm_event_cache = KMEM_CACHE(dm_uevent, 0);
+ _dm_event_cache = KMEM_CACHE(dm_uevent, SLAB_NO_MERGE);
if (!_dm_event_cache)
return -ENOMEM;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 0907d9e..88b8c16 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -314,17 +314,17 @@ static int __init local_init(void)
{
int r = -ENOMEM;
- /* allocate a slab for the dm_ios */
- _io_cache = KMEM_CACHE(dm_io, 0);
+ _io_cache = kmem_cache_create("dm_target_io", sizeof(struct dm_io),
+ __alignof__(struct dm_io), SLAB_NO_MERGE, NULL);
if (!_io_cache)
return r;
- _rq_tio_cache = KMEM_CACHE(dm_rq_target_io, 0);
+ _rq_tio_cache = KMEM_CACHE(dm_rq_target_io, SLAB_NO_MERGE);
if (!_rq_tio_cache)
goto out_free_io_cache;
_rq_cache = kmem_cache_create("dm_clone_request", sizeof(struct request),
- __alignof__(struct request), 0, NULL);
+ __alignof__(struct request), SLAB_NO_MERGE, NULL);
if (!_rq_cache)
goto out_free_rq_tio_cache;
--
2.3.2 (Apple Git-55)
--
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