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memcg: do not call reclaim if !__GFP_WAIT 

When trimming memcg consumption excess (see memory.high), we call
try_to_free_mem_cgroup_pages without checking if we are allowed to sleep
in the current context, which can result in a deadlock.  Fix this.

Fixes: 241994ed86 ("mm: memcontrol: default hierarchy interface for memory")
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
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 2015-06-10 11:14:46 -07:00 committed by Linus Torvalds
parent 85bd839983
commit 7d638093d4
1 changed files with 2 additions and 0 deletions
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mm/memcontrol.c
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@ -2323,6 +2323,8 @@ done_restock:
css_get_many(&memcg->css, batch);
if (batch > nr_pages)
refill_stock(memcg, batch - nr_pages);
if (!(gfp_mask & __GFP_WAIT))
goto done;
/*
* If the hierarchy is above the normal consumption range,
* make the charging task trim their excess contribution.