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authorJamie Liu <jamieliu@google.com>2014-12-10 15:43:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:06 -0800
commit1da58ee2a0279a1b0afd3248396de5659b8cf95b (patch)
tree1c0aec90fdb49d4caf7a5de3da700e76a4e41c46 /mm/vmscan.c
parentab1f306fa92f4d875c8f0b9e9f90e27ca8e7b37b (diff)
mm: vmscan: count only dirty pages as congested
shrink_page_list() counts all pages with a mapping, including clean pages, toward nr_congested if they're on a write-congested BDI. shrink_inactive_list() then sets ZONE_CONGESTED if nr_dirty == nr_congested. Fix this apples-to-oranges comparison by only counting pages for nr_congested if they count for nr_dirty. Signed-off-by: Jamie Liu <jamieliu@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Greg Thelen <gthelen@google.com> Cc: Hugh Dickins <hughd@google.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.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 59605b7c9970..53157e157061 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -874,7 +874,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
* end of the LRU a second time.
*/
mapping = page_mapping(page);
- if ((mapping && bdi_write_congested(mapping->backing_dev_info)) ||
+ if (((dirty || writeback) && mapping &&
+ bdi_write_congested(mapping->backing_dev_info)) ||
(writeback && PageReclaim(page)))
nr_congested++;