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authorDavid Rientjes <rientjes@google.com>2016-05-20 16:59:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-20 17:58:30 -0700
commitdfef2ef4027b1304149a65dc33794eab65e8a3bf (patch)
tree171faf89fcb9620cfde7132b21c49ba5392fd420 /mm
parent6cd9dc3e75078ef646076fa63adfb9b85ced0b66 (diff)
downloadlinux-dfef2ef4027b1304149a65dc33794eab65e8a3bf.tar.bz2
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@chino.kir.corp.google.com Signed-off-by: David Rientjes <rientjes@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/migrate.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 53ab6398e7a2..9baf41c877ff 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1171,6 +1171,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
switch(rc) {
case -ENOMEM:
+ nr_failed++;
goto out;
case -EAGAIN:
retry++;