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authorKonstantin Khlebnikov <khlebnikov@openvz.org>2012-01-10 15:07:03 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 16:30:41 -0800
commitc909e99364c8b6ca07864d752950b6b4ecf6bef4 (patch)
tree9942e7a9aeac9a334bb7b4a01c4add8e927b6218 /mm
parent34dbc67a644f11ab3475d822d72e25409911e760 (diff)
downloadlinux-c909e99364c8b6ca07864d752950b6b4ecf6bef4.tar.bz2
vmscan: activate executable pages after first usage
Logic added in commit 8cab4754d24a0 ("vmscan: make mapped executable pages the first class citizen") was noticeably weakened in commit 645747462435d84 ("vmscan: detect mapped file pages used only once"). Currently these pages can become "first class citizens" only after second usage. After this patch page_check_references() will activate they after first usage, and executable code gets yet better chance to stay in memory. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Shaohua Li <shaohua.li@intel.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmscan.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 753c1e6755f0..753a2dc300b9 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -718,6 +718,12 @@ static enum page_references page_check_references(struct page *page,
if (referenced_page || referenced_ptes > 1)
return PAGEREF_ACTIVATE;
+ /*
+ * Activate file-backed executable pages after first usage.
+ */
+ if (vm_flags & VM_EXEC)
+ return PAGEREF_ACTIVATE;
+
return PAGEREF_KEEP;
}