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vmscan: fix increasing nr_isolated incurred by putback unevictable pages

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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>
This commit is contained in:
Jaewon Kim 2015-09-08 15:02:21 -07:00 committed by Greg Kroah-Hartman
parent 706ad8dcb5
commit de047ce495
1 changed files with 1 additions and 1 deletions
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mm/vmscan.c
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@ -925,7 +925,7 @@ cull_mlocked:
if (PageSwapCache(page)) if (PageSwapCache(page))
try_to_free_swap(page); try_to_free_swap(page);
unlock_page(page); unlock_page(page);
putback_lru_page(page); list_add(&page->lru, &ret_pages);
continue; continue;
activate_locked: activate_locked: