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mm/vmpressure.c: fix subtree pressure detection

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When vmpressure is called for the entire subtree under pressure we
mistakenly use vmpressure->scanned instead of vmpressure->tree_scanned
when checking if vmpressure work is to be scheduled.  This results in
suppressing all vmpressure events in the legacy cgroup hierarchy.  Fix it.

Fixes: 8e8ae64524 ("mm: memcontrol: hook up vmpressure to socket pressure")
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.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 2016-02-02 16:57:49 -08:00 committed by Linus Torvalds
parent 30bdbb7800
commit 3c1da7beee
1 changed files with 1 additions and 2 deletions
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mm/vmpressure.c
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@ -248,9 +248,8 @@ void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
if (tree) {
spin_lock(&vmpr->sr_lock);
vmpr->tree_scanned += scanned;
scanned = vmpr->tree_scanned += scanned;
vmpr->tree_reclaimed += reclaimed;
scanned = vmpr->scanned;
spin_unlock(&vmpr->sr_lock);
if (scanned < vmpressure_win)