From de2e7567c7ddf24f0ca80010163ed10da66a14e2 Mon Sep 17 00:00:00 2001 From: Minchan Kim Date: Mon, 21 Sep 2009 17:01:43 -0700 Subject: [PATCH] vmscan: don't attempt to reclaim anon page in lumpy reclaim when no swap space is available 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. [akpm@linux-foundation.org: cleanup] Signed-off-by: Minchan Kim Reviewed-by: KOSAKI Motohiro Reviewed-by: Rik van Riel Cc: Mel Gorman Cc: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmscan.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 208071c48bf2..ece2ecb08102 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -935,6 +935,16 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, /* 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); -- GitLab