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Koen Kooi
56e60917b2
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com> Signed-off-by: Denys Dmytriyenko <denis@denix.org>
57 lines
2.0 KiB
Diff
57 lines
2.0 KiB
Diff
From 7560f662e5e895619c356365f675715d7f4ea577 Mon Sep 17 00:00:00 2001
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From: Konstantin Khlebnikov <khlebnikov@openvz.org>
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Date: Tue, 10 Jan 2012 15:07:03 -0800
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Subject: [PATCH 11/73] vmscan: activate executable pages after first usage
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commit c909e99364c8b6ca07864d752950b6b4ecf6bef4 upstream.
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Stable note: Not tracked in Bugzilla. There were reports of shared
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mapped pages being unfairly reclaimed in comparison to older kernels.
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This is being addressed over time.
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Logic added in commit 8cab4754d24a0 ("vmscan: make mapped executable pages
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the first class citizen") was noticeably weakened in commit
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645747462435d84 ("vmscan: detect mapped file pages used only once").
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Currently these pages can become "first class citizens" only after second
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usage. After this patch page_check_references() will activate they after
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first usage, and executable code gets yet better chance to stay in memory.
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Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
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Cc: Pekka Enberg <penberg@kernel.org>
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Cc: Minchan Kim <minchan.kim@gmail.com>
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Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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Cc: Wu Fengguang <fengguang.wu@intel.com>
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Cc: Johannes Weiner <hannes@cmpxchg.org>
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Cc: Nick Piggin <npiggin@kernel.dk>
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Cc: Mel Gorman <mel@csn.ul.ie>
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Cc: Shaohua Li <shaohua.li@intel.com>
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Cc: Rik van Riel <riel@redhat.com>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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mm/vmscan.c | 6 ++++++
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1 files changed, 6 insertions(+), 0 deletions(-)
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diff --git a/mm/vmscan.c b/mm/vmscan.c
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index cd27455..87de9c6 100644
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--- a/mm/vmscan.c
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+++ b/mm/vmscan.c
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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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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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+
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return PAGEREF_KEEP;
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}
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--
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1.7.7.6
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