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| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-10-26 16:49:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-10-29 07:39:27 -0700 |
| commit | 41e20983fe553b39bc2b00e07c7a379f0c86a4bc (patch) | |
| tree | 685433b37a7ebe5a61ac7315dc8017706227345b | |
| parent | b76146ed1ae7d7acae1d51f9342e31d00c8d5a12 (diff) | |
| download | lwn-41e20983fe553b39bc2b00e07c7a379f0c86a4bc.tar.gz lwn-41e20983fe553b39bc2b00e07c7a379f0c86a4bc.zip | |
vmscan: limit VM_EXEC protection to file pages
It is possible to have !Anon but SwapBacked pages, and some apps could
create huge number of such pages with MAP_SHARED|MAP_ANONYMOUS. These
pages go into the ANON lru list, and hence shall not be protected: we only
care mapped executable files. Failing to do so may trigger OOM.
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -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 fbb9f6bdad6e..fbcac3bdcf19 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1356,7 +1356,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone, * IO, plus JVM can create lots of anon VM_EXEC pages, * so we ignore them here. */ - if ((vm_flags & VM_EXEC) && !PageAnon(page)) { + if ((vm_flags & VM_EXEC) && page_is_file_cache(page)) { list_add(&page->lru, &l_active); continue; } |