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slab: do not panic if we fail to create memcg cache

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There is no point in flooding logs with warnings or especially crashing
the system if we fail to create a cache for a memcg.  In this case we
will be accounting the memcg allocation to the root cgroup until we
succeed to create its own cache, but it isn't that critical.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Davydov 2014-01-23 15:53:05 -08:00 committed by Linus Torvalds
parent 842e287369
commit f717eb3abb
1 changed files with 8 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
mm/slab_common.c
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@ -233,7 +233,14 @@ kmem_cache_create_memcg(struct mem_cgroup *memcg, const char *name, size_t size,
mutex_unlock(&slab_mutex); mutex_unlock(&slab_mutex);
put_online_cpus(); put_online_cpus();
if (err) { /*
* There is no point in flooding logs with warnings or especially
* crashing the system if we fail to create a cache for a memcg. In
* this case we will be accounting the memcg allocation to the root
* cgroup until we succeed to create its own cache, but it isn't that
* critical.
*/
if (err && !memcg) {
if (flags & SLAB_PANIC) if (flags & SLAB_PANIC)
panic("kmem_cache_create: Failed to create slab '%s'. Error %d\n", panic("kmem_cache_create: Failed to create slab '%s'. Error %d\n",
name, err); name, err);