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| author | Jaewon Kim <jaewon31.kim@samsung.com> | 2015-09-08 15:02:21 -0700 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-08-26 20:02:07 +0200 |
| commit | 54661b3dfd6338665a1180c003715d2615c70b28 (patch) | |
| tree | af0e9a6357eb0daf4c21aa010d5fe215034bdbda /kernel | |
| parent | f5d107064123577afbc394d634004d2672f2cd44 (diff) | |
vmscan: fix increasing nr_isolated incurred by putback unevictable pages
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 <jaewon31.kim@samsung.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Guendhoer <stefan@guendhoer.com>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions