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| author | Jaewon Kim <jaewon31.kim@samsung.com> | 2015-09-08 15:02:21 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-09-30 11:13:09 +0200 |
| commit | 9ee9b7b6eddb207f959952b30e785bd3c384cae1 (patch) | |
| tree | ac925e5be76c82fc26cd5d899ffd4f8e044a6287 | |
| parent | 768cb8d9028cc71a8b3ecc6d2de9f02db09b044f (diff) | |
| download | lwn-9ee9b7b6eddb207f959952b30e785bd3c384cae1.tar.gz lwn-9ee9b7b6eddb207f959952b30e785bd3c384cae1.zip | |
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: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | mm/vmscan.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 04c33d5fb079..6dc33d9dc2cf 100644 --- 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: |