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memcg, oom: notify on oom killer invocation from the charge path 

Burt Holzman has noticed that memcg v1 doesn't notify about OOM events via
eventfd anymore.  The reason is that 29ef680ae7 ("memcg, oom: move
out_of_memory back to the charge path") has moved the oom handling back to
the charge path.  While doing so the notification was left behind in
mem_cgroup_oom_synchronize.

Fix the issue by replicating the oom hierarchy locking and the
notification.

Link: http://lkml.kernel.org/r/20181224091107.18354-1-mhocko@kernel.org
Fixes: 29ef680ae7 ("memcg, oom: move out_of_memory back to the charge path")
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: Burt Holzman <burt@fnal.gov>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com
Cc: <stable@vger.kernel.org>	[4.19+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2018-12-28 00:39:57 -08:00 committed by Linus Torvalds
parent 7af7a8e19f
commit 7056d3a37d
1 changed files with 19 additions and 3 deletions
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22
mm/memcontrol.c
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@ -1673,6 +1673,9 @@ enum oom_status {
static enum oom_status mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
{
enum oom_status ret;
bool locked;
if (order > PAGE_ALLOC_COSTLY_ORDER)
return OOM_SKIPPED;
@ -1707,10 +1710,23 @@ static enum oom_status mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int
return OOM_ASYNC;
}
if (mem_cgroup_out_of_memory(memcg, mask, order))
return OOM_SUCCESS;
mem_cgroup_mark_under_oom(memcg);
return OOM_FAILED;
locked = mem_cgroup_oom_trylock(memcg);
if (locked)
mem_cgroup_oom_notify(memcg);
mem_cgroup_unmark_under_oom(memcg);
if (mem_cgroup_out_of_memory(memcg, mask, order))
ret = OOM_SUCCESS;
else
ret = OOM_FAILED;
if (locked)
mem_cgroup_oom_unlock(memcg);
return ret;
}
/**