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mm: vmscan: count only dirty pages as congested

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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>
This commit is contained in:
Jamie Liu 2014-12-10 15:43:20 -08:00 committed by Linus Torvalds
parent ab1f306fa9
commit 1da58ee2a0
1 changed files with 2 additions and 1 deletions
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mm/vmscan.c
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@ -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++;