The patch titled
Subject: mm: fix 100% CPU kswapd busyloop on unreclaimable nodes fix
has been added to the -mm tree. Its filename is
mm-fix-100%-cpu-kswapd-busyloop-on-unreclaimable-nodes-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-fix-100%25-cpu-kswapd-busyloop-on-unreclaimable-nodes-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-fix-100%25-cpu-kswapd-busyloop-on-unreclaimable-nodes-fix.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: fix 100% CPU kswapd busyloop on unreclaimable nodes fix
Check kswapd failure against the cumulative nr_reclaimed count, not
against the count from the lowest priority iteration.
Link: http://lkml.kernel.org/r/20170306162410.GB2090@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Suggested-by: Minchan Kim <minchan@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Jia He <hejianet@xxxxxxxxx>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff -puN mm/vmscan.c~mm-fix-100%-cpu-kswapd-busyloop-on-unreclaimable-nodes-fix mm/vmscan.c
--- a/mm/vmscan.c~mm-fix-100%-cpu-kswapd-busyloop-on-unreclaimable-nodes-fix
+++ a/mm/vmscan.c
@@ -3223,9 +3223,9 @@ static int balance_pgdat(pg_data_t *pgda
count_vm_event(PAGEOUTRUN);
do {
+ unsigned long nr_reclaimed = sc.nr_reclaimed;
bool raise_priority = true;
- sc.nr_reclaimed = 0;
sc.reclaim_idx = classzone_idx;
/*
@@ -3315,7 +3315,8 @@ static int balance_pgdat(pg_data_t *pgda
* Raise priority if scanning rate is too low or there was no
* progress in reclaiming pages
*/
- if (raise_priority || !sc.nr_reclaimed)
+ nr_reclaimed = sc.nr_reclaimed - nr_reclaimed;
+ if (raise_priority || !nr_reclaimed)
sc.priority--;
} while (sc.priority >= 1);
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
mm-fix-100%-cpu-kswapd-busyloop-on-unreclaimable-nodes.patch
mm-fix-100%-cpu-kswapd-busyloop-on-unreclaimable-nodes-fix.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
mm-memcontrol-provide-shmem-statistics.patch
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