Commit 1da58ee2 authored by Jamie Liu's avatar Jamie Liu Committed by Linus Torvalds

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: default avatarJamie 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ab1f306f
......@@ -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++;
......
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