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authorMinchan Kim <minchan.kim@gmail.com>2011-10-31 17:06:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-31 17:30:44 -0700
commitf80c0673610e36ae29d63e3297175e22f70dde5f (patch)
tree0a6aab3b637fa75961224e9261eb544156672c34 /include
parent39deaf8585152f1a35c1676d3d7dc6ae0fb65967 (diff)
mm: zone_reclaim: make isolate_lru_page() filter-aware
In __zone_reclaim case, we don't want to shrink mapped page. Nonetheless, we have isolated mapped page and re-add it into LRU's head. It's unnecessary CPU overhead and makes LRU churning. Of course, when we isolate the page, the page might be mapped but when we try to migrate the page, the page would be not mapped. So it could be migrated. But race is rare and although it happens, it's no big deal. Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmzone.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 80da968798ea..ec57779c5a57 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -170,6 +170,8 @@ static inline int is_unevictable_lru(enum lru_list l)
#define ISOLATE_ACTIVE ((__force isolate_mode_t)0x2)
/* Isolate clean file */
#define ISOLATE_CLEAN ((__force isolate_mode_t)0x4)
+/* Isolate unmapped file */
+#define ISOLATE_UNMAPPED ((__force isolate_mode_t)0x8)
/* LRU Isolation modes. */
typedef unsigned __bitwise__ isolate_mode_t;