The patch titled
mm: vmscan: if kswapd has been running too long, allow it to sleep
has been added to the -mm tree. Its filename is
mm-vmscan-if-kswapd-has-been-running-too-long-allow-it-to-sleep.patch
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------------------------------------------------------
Subject: mm: vmscan: if kswapd has been running too long, allow it to sleep
From: Mel Gorman <mgorman@xxxxxxx>
Under constant allocation pressure, kswapd can be in the situation where
sleeping_prematurely() will always return true even if kswapd has been
running a long time. Check if kswapd needs to be scheduled.
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Colin King <colin.king@xxxxxxxxxxxxx>
Cc: Raghavendra D Prabhu <raghu.prabhu13@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Chris Mason <chris.mason@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: <stable@xxxxxxxxxx> [2.6.38+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN mm/vmscan.c~mm-vmscan-if-kswapd-has-been-running-too-long-allow-it-to-sleep mm/vmscan.c
--- a/mm/vmscan.c~mm-vmscan-if-kswapd-has-been-running-too-long-allow-it-to-sleep
+++ a/mm/vmscan.c
@@ -2251,6 +2251,10 @@ static bool sleeping_prematurely(pg_data
unsigned long balanced = 0;
bool all_zones_ok = true;
+ /* If kswapd has been running too long, just sleep */
+ if (need_resched())
+ return false;
+
/* If a direct reclaimer woke kswapd within HZ/10, it's premature */
if (remaining)
return true;
_
Patches currently in -mm which might be from mgorman@xxxxxxx are
origin.patch
mm-vmscan-correct-use-of-pgdat_balanced-in-sleeping_prematurely.patch
mm-vmscan-if-kswapd-has-been-running-too-long-allow-it-to-sleep.patch
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