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>
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@ -874,7 +874,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
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* end of the LRU a second time.
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* end of the LRU a second time.
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*/
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*/
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mapping = page_mapping(page);
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mapping = page_mapping(page);
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if ((mapping && bdi_write_congested(mapping->backing_dev_info)) ||
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if (((dirty || writeback) && mapping &&
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bdi_write_congested(mapping->backing_dev_info)) ||
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(writeback && PageReclaim(page)))
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(writeback && PageReclaim(page)))
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nr_congested++;
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nr_congested++;
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