The patch titled
Subject: mm: fix check for reclaimable pages in PF_MEMALLOC reclaim throttling
has been added to the -mm tree. Its filename is
mm-fix-check-for-reclaimable-pages-in-pf_memalloc-reclaim-throttling.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-fix-check-for-reclaimable-pages-in-pf_memalloc-reclaim-throttling.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-fix-check-for-reclaimable-pages-in-pf_memalloc-reclaim-throttling.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: 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@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Jia He <hejianet@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff -puN mm/vmscan.c~mm-fix-check-for-reclaimable-pages-in-pf_memalloc-reclaim-throttling mm/vmscan.c
--- a/mm/vmscan.c~mm-fix-check-for-reclaimable-pages-in-pf_memalloc-reclaim-throttling
+++ a/mm/vmscan.c
@@ -2831,8 +2831,10 @@ static bool pfmemalloc_watermark_ok(pg_d
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);
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
mm-fix-100%-cpu-kswapd-busyloop-on-unreclaimable-nodes.patch
mm-fix-check-for-reclaimable-pages-in-pf_memalloc-reclaim-throttling.patch
mm-remove-seemingly-spurious-reclaimability-check-from-laptop_mode-gating.patch
mm-remove-unnecessary-reclaimability-check-from-numa-balancing-target.patch
mm-dont-avoid-high-priority-reclaim-on-unreclaimable-nodes.patch
mm-dont-avoid-high-priority-reclaim-on-memcg-limit-reclaim.patch
mm-delete-nr_pages_scanned-and-pgdat_reclaimable.patch
revert-mm-vmscan-account-for-skipped-pages-as-a-partial-scan.patch
mm-remove-unnecessary-back-off-function-when-retrying-page-reclaim.patch
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