tree 38257203476057e32f32de241f0d6dc2b7e11891
parent 900a38f027b37b55ebe157a0cb31de351b91e4e2
author Vladimir Davydov <vdavydov@parallels.com> 1418432113 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1418503367 -0800

memcg: only check memcg_kmem_skip_account in __memcg_kmem_get_cache

__memcg_kmem_get_cache can recurse if it calls kmalloc (which it does if
the cgroup's kmem cache doesn't exist), because kmalloc may call
__memcg_kmem_get_cache internally again.  To avoid the recursion, we use
the task_struct->memcg_kmem_skip_account flag.

However, there's no need checking the flag in memcg_kmem_newpage_charge,
because there's no way how this function could result in recursion, if
called from memcg_kmem_get_cache.  So let's remove the redundant code.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>