The patch titled
Subject: mm: forcibly swapout when we are out of page cache
has been added to the -mm tree. Its filename is
mm-forcibly-swapout-when-we-are-out-of-page-cache.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: mm: forcibly swapout when we are out of page cache
If laptop_mode is enable the VM tries to avoid I/O for saving power. But
if there isn't reclaimable memory without I/O, we should do I/O to prevent
an unnecessary OOM kill, although we sacrifice some power.
One example is when we are out of page cache. Remaining memory is only
anonymous pages, for swapping out, we needs may_writepage = 1.
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Reported-by: Luigi Semenzato <semenzato@xxxxxxxxxx>
Cc: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Cc: Sonny Rao <sonnyrao@xxxxxxxxxx>
Cc: Bryan Freed <bfreed@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN mm/vmscan.c~mm-forcibly-swapout-when-we-are-out-of-page-cache mm/vmscan.c
--- a/mm/vmscan.c~mm-forcibly-swapout-when-we-are-out-of-page-cache
+++ a/mm/vmscan.c
@@ -1728,6 +1728,12 @@ static void get_scan_count(struct lruvec
free = zone_page_state(zone, NR_FREE_PAGES);
if (unlikely(file + free <= high_wmark_pages(zone))) {
scan_balance = SCAN_ANON;
+ /*
+ * From now on, we have to swap out
+ * for peventing OOM kill although
+ * we sacrifice power consumption.
+ */
+ sc->may_writepage = 1;
goto out;
}
}
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
origin.patch
mm-compaction-fix-echo-1-compact_memory-return-error-issue.patch
mm-compaction-make-__compact_pgdat-and-compact_pgdat-return-void.patch
mm-prevent-addition-of-pages-to-swap-if-may_writepage-is-unset.patch
mm-forcibly-swapout-when-we-are-out-of-page-cache.patch
mm-forcibly-swapout-when-we-are-out-of-page-cache-fix.patch
mm-add-vm-event-counters-for-balloon-pages-compaction.patch
block-aio-batch-completion-for-bios-kiocbs-fix-fix-fix-fix-fix.patch
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