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| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-10-26 16:49:53 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-11-09 16:23:05 -0800 |
| commit | 94f48f549e455e4abbb3f0d6e65185830cbec8f1 (patch) | |
| tree | 69ec9b645ea8dc731dfd2dac69567653569c8608 | |
| parent | 781e844b1db70e0fe4911fa049e675a010d79cf9 (diff) | |
| download | lwn-94f48f549e455e4abbb3f0d6e65185830cbec8f1.tar.gz lwn-94f48f549e455e4abbb3f0d6e65185830cbec8f1.zip | |
vmscan: limit VM_EXEC protection to file pages
commit 41e20983fe553b39bc2b00e07c7a379f0c86a4bc upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -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 94e86dd6954c..95f35a7d1f05 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1298,7 +1298,7 @@ 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; } |