Commit c909e993 authored Jan 10, 2012 by Konstantin Khlebnikov Committed by Linus Torvalds Jan 10, 2012

vmscan: activate executable pages after first usage



Logic added in commit 8cab4754 ("vmscan: make mapped executable pages
the first class citizen") was noticeably weakened in commit
64574746 ("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>

parent 34dbc67a

mm/vmscan.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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