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vmscan: activate executable pages after first usage

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Logic added in commit 8cab4754d2 ("vmscan: make mapped executable pages
the first class citizen") was noticeably weakened in commit
6457474624 ("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 <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: Wu Fengguang <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Shaohua Li <[email protected]>
Cc: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Konstantin Khlebnikov 2012-01-10 15:07:03 -08:00 • committed by Linus Torvalds
commit c909e99364
1 changed files with 6 additions and 0 deletions
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6
mm/vmscan.c
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@ -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;
}