The patch titled
vmscan: activate executable pages after first usage
has been added to the -mm tree. Its filename is
vmscan-activate-executable-pages-after-first-usage.patch
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------------------------------------------------------
Subject: vmscan: activate executable pages after first usage
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
Logic added in commit 8cab4754d24a0 ("vmscan: make mapped executable pages
the first class citizen") was noticeably weakened in commit
645747462435d84 ("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@xxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Shaohua Li <shaohua.li@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN mm/vmscan.c~vmscan-activate-executable-pages-after-first-usage mm/vmscan.c
--- a/mm/vmscan.c~vmscan-activate-executable-pages-after-first-usage
+++ a/mm/vmscan.c
@@ -718,6 +718,12 @@ static enum page_references page_check_r
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;
}
_
Patches currently in -mm which might be from khlebnikov@xxxxxxxxxx are
vmscan-fix-initial-shrinker-size-handling.patch
vmscan-use-atomic-long-for-shrinker-batching.patch
vmscan-use-atomic-long-for-shrinker-batching-fix.patch
vmscan-promote-shared-file-mapped-pages.patch
vmscan-activate-executable-pages-after-first-usage.patch
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