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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2010-10-26 21:21:44 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 23:52:07 (GMT)
commit08fc468f4eaf6683bae5bdb94743a09d8630cb80 (patch)
treea2225421eb8e01a8e9df588f5064be81059af91a /mm/vmscan.c
parent47185052165a4c5de0a461018238375dd982c2ec (diff)
vmscan: isolate_lru_pages(): stop neighbour search if neighbour cannot be isolated
isolate_lru_pages() does not just isolate LRU tail pages, but also isolates neighbour pages of the eviction page. The neighbour search does not stop even if neighbours cannot be isolated which is excessive as the lumpy reclaim will no longer result in a successful higher order allocation. This patch stops the PFN neighbour pages if an isolation fails and moves on to the next block. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Wu Fengguang <fengguang.wu@intel.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index cec8081..130ad02 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1051,7 +1051,7 @@ 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;
+ break;
/*
* If we don't have enough swap space, reclaiming of
@@ -1059,8 +1059,8 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
* pointless.
*/
if (nr_swap_pages <= 0 && PageAnon(cursor_page) &&
- !PageSwapCache(cursor_page))
- continue;
+ !PageSwapCache(cursor_page))
+ break;
if (__isolate_lru_page(cursor_page, mode, file) == 0) {
list_move(&cursor_page->lru, dst);
@@ -1071,11 +1071,16 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
nr_lumpy_dirty++;
scan++;
} else {
- if (mode == ISOLATE_BOTH &&
- page_count(cursor_page))
- nr_lumpy_failed++;
+ /* the page is freed already. */
+ if (!page_count(cursor_page))
+ continue;
+ break;
}
}
+
+ /* If we break out of the loop above, lumpy reclaim failed */
+ if (pfn < end_pfn)
+ nr_lumpy_failed++;
}
*scanned = scan;

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