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Commit 3c1da7be authored by Vladimir Davydov's avatar Vladimir Davydov Committed by Linus Torvalds
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mm/vmpressure.c: fix subtree pressure detection 



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: 8e8ae645 ("mm: memcontrol: hook up vmpressure to socket pressure")
Signed-off-by: default avatarVladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 30bdbb78

mm/vmpressure.c

+1 −2
Original line number Diff line number Diff line
@@ -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)