The patch titled
vmscan: don't attempt to reclaim anon page in lumpy reclaim when no swap space is avilable
has been added to the -mm tree. Its filename is
vmscan-dont-attempt-to-reclaim-anon-page-in-lumpy-reclaim-when-no-swap-space-is-avilable.patch
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------------------------------------------------------
Subject: vmscan: don't attempt to reclaim anon page in lumpy reclaim when no swap space is avilable
From: Minchan Kim <minchan.kim@xxxxxxxxx>
The VM already avoids attempting to reclaim anon pages in various places,
But it doesn't avoid it for lumpy reclaim.
It shuffles lru list unnecessary so that it is pointless.
Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff -puN mm/vmscan.c~vmscan-dont-attempt-to-reclaim-anon-page-in-lumpy-reclaim-when-no-swap-space-is-avilable mm/vmscan.c
--- a/mm/vmscan.c~vmscan-dont-attempt-to-reclaim-anon-page-in-lumpy-reclaim-when-no-swap-space-is-avilable
+++ a/mm/vmscan.c
@@ -930,6 +930,15 @@ static unsigned long isolate_lru_pages(u
/* Check that we have not crossed a zone boundary. */
if (unlikely(page_zone_id(cursor_page) != zone_id))
continue;
+
+ /*
+ * If we don't have enough swap space, reclaiming of anon page
+ * which don't already have a swap slot is pointless.
+ */
+ if (nr_swap_pages <= 0 && (PageAnon(cursor_page) &&
+ !PageSwapCache(cursor_page)))
+ continue;
+
if (__isolate_lru_page(cursor_page, mode, file) == 0) {
list_move(&cursor_page->lru, dst);
mem_cgroup_del_lru(cursor_page);
_
Patches currently in -mm which might be from minchan.kim@xxxxxxxxx are
linux-next.patch
mm-show_free_areas-display-slab-pages-in-two-separate-fields.patch
mm-oom-analysis-add-per-zone-statistics-to-show_free_areas.patch
mm-oom-analysis-show-kernel-stack-usage-in-proc-meminfo-and-oom-log-output.patch
mm-rename-pgmoved-variable-in-shrink_active_list.patch
mm-shrink_inactive_list-nr_scan-accounting-fix-fix.patch
mm-vmstat-add-isolate-pages.patch
mm-vmstat-add-isolate-pages-fix.patch
mm-remove-__addsub_zone_page_state.patch
mm-count-only-reclaimable-lru-pages-v2.patch
vmscan-dont-attempt-to-reclaim-anon-page-in-lumpy-reclaim-when-no-swap-space-is-avilable.patch
vmscan-dont-attempt-to-reclaim-anon-page-in-lumpy-reclaim-when-no-swap-space-is-avilable-cleanup.patch
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