vmscan: activate executable pages after first usage
Logic added in commit8cab4754d2
("vmscan: make mapped executable pages the first class citizen") was noticeably weakened in commit6457474624
("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>
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@ -718,6 +718,12 @@ static enum page_references page_check_references(struct page *page,
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if (referenced_page || referenced_ptes > 1)
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if (referenced_page || referenced_ptes > 1)
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return PAGEREF_ACTIVATE;
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return PAGEREF_ACTIVATE;
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/*
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* Activate file-backed executable pages after first usage.
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*/
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if (vm_flags & VM_EXEC)
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return PAGEREF_ACTIVATE;
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return PAGEREF_KEEP;
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return PAGEREF_KEEP;
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}
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}
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