The patch titled
Subject: mm, migrate: increment fail count on ENOMEM
has been added to the -mm tree. Its filename is
mm-migrate-increment-fail-count-on-enomem.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-migrate-increment-fail-count-on-enomem.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-migrate-increment-fail-count-on-enomem.patch
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------------------------------------------------------
From: David Rientjes <rientjes@xxxxxxxxxx>
Subject: mm, migrate: increment fail count on ENOMEM
If page migration fails due to -ENOMEM, nr_failed should still be
incremented for proper statistics.
This was encountered recently when all page migration vmstats showed 0,
and inferred that migrate_pages() was never called, although in reality
the first page migration failed because compaction_alloc() failed to find
a migration target.
This patch increments nr_failed so the vmstat is properly accounted on
ENOMEM.
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1605191510230.32658@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 1 +
1 file changed, 1 insertion(+)
diff -puN mm/migrate.c~mm-migrate-increment-fail-count-on-enomem mm/migrate.c
--- a/mm/migrate.c~mm-migrate-increment-fail-count-on-enomem
+++ a/mm/migrate.c
@@ -1171,6 +1171,7 @@ int migrate_pages(struct list_head *from
switch(rc) {
case -ENOMEM:
+ nr_failed++;
goto out;
case -EAGAIN:
retry++;
_
Patches currently in -mm which might be from rientjes@xxxxxxxxxx are
mm-hugetlb_cgroup-round-limit_in_bytes-down-to-hugepage-size.patch
mm-thp-khugepaged-should-scan-when-sleep-value-is-written.patch
mm-migrate-increment-fail-count-on-enomem.patch
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