[PATCH 2/2] vmscan: activate executable pages after first usage

From: Konstantin Khlebnikov
Date: Mon Aug 08 2011 - 07:07:15 EST

Logic added in commit v2.6.30-5507-g8cab475
(vmscan: make mapped executable pages the first class citizen)
was noticeably weakened in commit v2.6.33-5448-g6457474
(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.

run some cool tests like in v2.6.30-5507-g8cab475 =)

Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
mm/vmscan.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 3cd766d..29b3612 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -727,6 +727,12 @@ static enum page_references page_check_references(struct page *page,
if (referenced_page || referenced_ptes > 1)

+ /*
+ * Activate file-backed executable pages after first usage.
+ */
+ if (vm_flags & VM_EXEC)

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