This is a note to let you know that I've just added the patch titled
mm/vmscan.c: consider swap space when deciding whether to continue reclaim
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-vmscan.c-consider-swap-space-when-deciding-whether-to-continue-reclaim.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 86cfd3a45042ab242d47f3935a02811a402beab6 Mon Sep 17 00:00:00 2001
From: Minchan Kim <[email protected]>
Date: Tue, 10 Jan 2012 15:08:18 -0800
Subject: mm/vmscan.c: consider swap space when deciding whether to continue
reclaim
From: Minchan Kim <[email protected]>
commit 86cfd3a45042ab242d47f3935a02811a402beab6 upstream.
Stable note: Not tracked in Bugzilla. This patch reduces kswapd CPU
usage on swapless systems with high anonymous memory usage.
It's pointless to continue reclaiming when we have no swap space and lots
of anon pages in the inactive list.
Without this patch, it is possible when swap is disabled to continue
trying to reclaim when there are only anonymous pages in the system even
though that will not make any progress.
Signed-off-by: Minchan Kim <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
mm/vmscan.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2008,8 +2008,9 @@ static inline bool should_continue_recla
* inactive lists are large enough, continue reclaiming
*/
pages_for_compaction = (2UL << sc->order);
- inactive_lru_pages = zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON) +
- zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
+ inactive_lru_pages = zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
+ if (nr_swap_pages > 0)
+ inactive_lru_pages += zone_nr_lru_pages(zone, sc,
LRU_INACTIVE_ANON);
if (sc->nr_reclaimed < pages_for_compaction &&
inactive_lru_pages > pages_for_compaction)
return true;
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/mm-test-pageswapbacked-in-lumpy-reclaim.patch
queue-3.0/mm-fix-lost-kswapd-wakeup-in-kswapd_stop.patch
queue-3.0/mm-vmscan.c-consider-swap-space-when-deciding-whether-to-continue-reclaim.patch
queue-3.0/mm-compaction-make-isolate_lru_page-filter-aware-again.patch
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