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authorVladimir Davydov <vdavydov.dev@gmail.com>2016-12-13 03:41:32 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-13 05:55:06 +0300
commit89e364db71fb5e7fc8d93228152abfa67daf35fa (patch)
tree7e70cba61d27fc6e7c7ebd21ec498b808ba2e132 /mm/slab.c
parent13583c3d3224508582ec03d881d0b68dd3ee8e10 (diff)
downloadlinux-89e364db71fb5e7fc8d93228152abfa67daf35fa.tar.xz
slub: move synchronize_sched out of slab_mutex on shrink
synchronize_sched() is a heavy operation and calling it per each cache owned by a memory cgroup being destroyed may take quite some time. What is worse, it's currently called under the slab_mutex, stalling all works doing cache creation/destruction. Actually, there isn't much point in calling synchronize_sched() for each cache - it's enough to call it just once - after setting cpu_partial for all caches and before shrinking them. This way, we can also move it out of the slab_mutex, which we have to hold for iterating over the slab cache list. Link: https://bugzilla.kernel.org/show_bug.cgi?id=172991 Link: http://lkml.kernel.org/r/0a10d71ecae3db00fb4421bcd3f82bcc911f4be4.1475329751.git.vdavydov.dev@gmail.com Signed-off-by: Vladimir Davydov <vdavydov.dev@gmail.com> Reported-by: Doug Smythies <dsmythies@telus.net> Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 0b0550ca85b4..7ea765cd7e93 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2332,7 +2332,7 @@ out:
return nr_freed;
}
-int __kmem_cache_shrink(struct kmem_cache *cachep, bool deactivate)
+int __kmem_cache_shrink(struct kmem_cache *cachep)
{
int ret = 0;
int node;
@@ -2352,7 +2352,7 @@ int __kmem_cache_shrink(struct kmem_cache *cachep, bool deactivate)
int __kmem_cache_shutdown(struct kmem_cache *cachep)
{
- return __kmem_cache_shrink(cachep, false);
+ return __kmem_cache_shrink(cachep);
}
void __kmem_cache_release(struct kmem_cache *cachep)