Commit ee993b13 authored Jun 16, 2009 by KAMEZAWA Hiroyuki Committed by Linus Torvalds Jun 16, 2009

mm: fix lumpy reclaim lru handling at isolate_lru_pages



At lumpy reclaim, a page failed to be taken by __isolate_lru_page() can be
pushed back to "src" list by list_move().  But the page may not be from
"src" list.  This pushes the page back to wrong LRU.  And list_move()
itself is unnecessary because the page is not on top of LRU.  Then, leave
it as it is if __isolate_lru_page() fails.

Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 24cf7251

mm/vmscan.c

+1 −9

Original line number	Diff line number	Diff line
		@@ -929,18 +929,10 @@ 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;
		switch (__isolate_lru_page(cursor_page, mode, file)) {
		case 0:
		if (__isolate_lru_page(cursor_page, mode, file) == 0) {
		list_move(&cursor_page->lru, dst);
		nr_taken++;
		scan++;
		break;

		case -EBUSY:
		/* else it is being freed elsewhere */
		list_move(&cursor_page->lru, src);
		default:
		break; /* ! on LRU or wrong list */
		}
		}
		}