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authorJohannes Weiner <hannes@cmpxchg.org>2017-05-03 14:51:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 15:52:07 -0700
commitd450abd81b081d45adb12f303a07dd44b15eb1bc (patch)
tree41d14fe3f3ffc90060c0a189b4946d2fb320e987 /mm/vmscan.c
parentc73322d098e4b6f5f0f0fa1330bf57e218775539 (diff)
downloadlinux-d450abd81b081d45adb12f303a07dd44b15eb1bc.tar.bz2
mm: fix check for reclaimable pages in PF_MEMALLOC reclaim throttling
PF_MEMALLOC direct reclaimers get throttled on a node when the sum of all free pages in each zone fall below half the min watermark. During the summation, we want to exclude zones that don't have reclaimables. Checking the same pgdat over and over again doesn't make sense. Fixes: 599d0c954f91 ("mm, vmscan: move LRU lists to node") Link: http://lkml.kernel.org/r/20170228214007.5621-3-hannes@cmpxchg.org Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Jia He <hejianet@gmail.com> Cc: Mel Gorman <mgorman@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 667644e53b5c..52832bedb2ed 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2835,8 +2835,10 @@ static bool allow_direct_reclaim(pg_data_t *pgdat)
for (i = 0; i <= ZONE_NORMAL; i++) {
zone = &pgdat->node_zones[i];
- if (!managed_zone(zone) ||
- pgdat_reclaimable_pages(pgdat) == 0)
+ if (!managed_zone(zone))
+ continue;
+
+ if (!zone_reclaimable_pages(zone))
continue;
pfmemalloc_reserve += min_wmark_pages(zone);