The patch titled
Subject: mm: correct the comment when reclaimed pages exceed the scanned pages
has been added to the -mm tree. Its filename is
mm-correct-the-comment-when-reclaimed-pages-exceed-the-scanned-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-correct-the-comment-when-reclaimed-pages-exceed-the-scanned-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-correct-the-comment-when-reclaimed-pages-exceed-the-scanned-pages.patch
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------------------------------------------------------
From: zhongjiang <zhongjiang@xxxxxxxxxx>
Subject: mm: correct the comment when reclaimed pages exceed the scanned pages
e1587a494540 ("mm: vmpressure: fix sending wrong events on underflow")
declare that reclaimed pages exceed the scanned pages due to the thp
reclaim. it is incorrect because THP will be spilt to normal page and
loop again. which will result in the scanned pages increment.
Link: http://lkml.kernel.org/r/1496824266-25235-1-git-send-email-zhongjiang@xxxxxxxxxx
Signed-off-by: zhongjiang <zhongjiang@xxxxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmpressure.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff -puN mm/vmpressure.c~mm-correct-the-comment-when-reclaimed-pages-exceed-the-scanned-pages mm/vmpressure.c
--- a/mm/vmpressure.c~mm-correct-the-comment-when-reclaimed-pages-exceed-the-scanned-pages
+++ a/mm/vmpressure.c
@@ -116,8 +116,9 @@ static enum vmpressure_levels vmpressure
/*
* reclaimed can be greater than scanned in cases
- * like THP, where the scanned is 1 and reclaimed
- * could be 512
+ * like reclaimed slab pages, shrink_node just add
+ * reclaimed page without a related increment to
+ * scanned pages.
*/
if (reclaimed >= scanned)
goto out;
_
Patches currently in -mm which might be from zhongjiang@xxxxxxxxxx are
mm-correct-the-comment-when-reclaimed-pages-exceed-the-scanned-pages.patch
mm-page_owner-align-with-pageblock_nr-pages.patch
mm-walk-the-zone-in-pageblock_nr_pages-steps.patch
signal-avoid-undefined-behaviour-in-kill_something_info.patch
exit-avoid-undefined-behaviour-when-call-wait4.patch
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