The patch titled
Subject: mm: vmscan: count only dirty pages as congested
has been added to the -mm tree. Its filename is
mm-vmscan-count-only-dirty-pages-as-congested.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-vmscan-count-only-dirty-pages-as-congested.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-vmscan-count-only-dirty-pages-as-congested.patch
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------------------------------------------------------
From: Jamie Liu <jamieliu@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Greg Thelen <gthelen@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/vmscan.c~mm-vmscan-count-only-dirty-pages-as-congested mm/vmscan.c
--- a/mm/vmscan.c~mm-vmscan-count-only-dirty-pages-as-congested
+++ a/mm/vmscan.c
@@ -874,7 +874,8 @@ static unsigned long shrink_page_list(st
* 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++;
_
Patches currently in -mm which might be from jamieliu@xxxxxxxxxx are
origin.patch
mm-vmscan-count-only-dirty-pages-as-congested.patch
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