Messages in this thread Patch in this message | | | From | Jamie Liu <> | Subject | [PATCH] mm: vmscan: count only dirty pages as congested | Date | Wed, 15 Oct 2014 12:58:35 -0700 |
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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> --- mm/vmscan.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c index dcb4707..ad9cd9f 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -875,7 +875,8 @@ 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++; -- 2.1.0.rc2.206.gedb03e5
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