This is a note to let you know that I've just added the patch titled
vmscan: fix increasing nr_isolated incurred by putback unevictable pages
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vmscan-fix-increasing-nr_isolated-incurred-by-putback-unevictable-pages.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c54839a722a02818677bcabe57e957f0ce4f841d Mon Sep 17 00:00:00 2001
From: Jaewon Kim <[email protected]>
Date: Tue, 8 Sep 2015 15:02:21 -0700
Subject: vmscan: fix increasing nr_isolated incurred by putback unevictable
pages
From: Jaewon Kim <[email protected]>
commit c54839a722a02818677bcabe57e957f0ce4f841d upstream.
reclaim_clean_pages_from_list() assumes that shrink_page_list() returns
number of pages removed from the candidate list. But shrink_page_list()
puts back mlocked pages without passing it to caller and without
counting as nr_reclaimed. This increases nr_isolated.
To fix this, this patch changes shrink_page_list() to pass unevictable
pages back to caller. Caller will take care those pages.
Minchan said:
It fixes two issues.
1. With unevictable page, cma_alloc will be successful.
Exactly speaking, cma_alloc of current kernel will fail due to
unevictable pages.
2. fix leaking of NR_ISOLATED counter of vmstat
With it, too_many_isolated works. Otherwise, it could make hang until
the process get SIGKILL.
Signed-off-by: Jaewon Kim <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Cc: Mel Gorman <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
mm/vmscan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1087,7 +1087,7 @@ cull_mlocked:
if (PageSwapCache(page))
try_to_free_swap(page);
unlock_page(page);
- putback_lru_page(page);
+ list_add(&page->lru, &ret_pages);
continue;
activate_locked:
Patches currently in stable-queue which might be from [email protected]
are
queue-3.14/vmscan-fix-increasing-nr_isolated-incurred-by-putback-unevictable-pages.patch
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