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mm: vmscan: do not scan anon pages if memcg swap limit is hit

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We don't scan anonymous memory if we ran out of swap, neither should we do
it in case memcg swap limit is hit, because swap out is impossible anyway.

Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
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
2016-01-20 15:03:07 -08:00
committed by Linus Torvalds
parent 6f2cb2f177
commit d8b38438a0
3 changed files with 20 additions and 1 deletions
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mm/vmscan.c
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@@ -2004,7 +2004,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
force_scan = true;
/* If we have no swap space, do not bother scanning anon pages. */
if (!sc->may_swap || (get_nr_swap_pages() <= 0)) {
if (!sc->may_swap || mem_cgroup_get_nr_swap_pages(memcg) <= 0) {
scan_balance = SCAN_FILE;
goto out;
}