tree 1c0aec90fdb49d4caf7a5de3da700e76a4e41c46
parent ab1f306fa92f4d875c8f0b9e9f90e27ca8e7b37b
author Jamie Liu <jamieliu@google.com> 1418255000 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1418262066 -0800

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>