This is a note to let you know that I've just added the patch titled
sched: Fix volanomark performance regression
to the 2.6.32-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.32.git;a=summary
The filename of the patch is:
0026-sched-Fix-volanomark-performance-regression.patch
and it can be found in the queue-2.6.32 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.32 longterm
tree,
please let <[email protected]> know about it.
>From 44415e7327fead0d3acbe1e4b310fc6bc3117d6d Mon Sep 17 00:00:00 2001
From: Alex Shi <[email protected]>
Date: Thu, 10 Feb 2011 10:23:29 +0100
Subject: sched: Fix volanomark performance regression
Commit: b5482cfa1c95a188b3054fa33274806add91bbe5 upstream
Commit fab4762 triggers excessive idle balancing, causing a ~30% loss in
volanomark throughput. Remove idle balancing throttle reset.
Originally-by: Alex Shi <[email protected]>
Signed-off-by: Mike Galbraith <[email protected]>
Acked-by: Nikhil Rao <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Mike Galbraith <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/sched.c | 4 ----
1 file changed, 4 deletions(-)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3326,10 +3326,6 @@ static void pull_task(struct rq *src_rq,
set_task_cpu(p, this_cpu);
activate_task(this_rq, p, 0);
check_preempt_curr(this_rq, p, 0);
-
- /* re-arm NEWIDLE balancing when moving tasks */
- src_rq->avg_idle = this_rq->avg_idle = 2*sysctl_sched_migration_cost;
- this_rq->idle_stamp = 0;
}
/*
Patches currently in longterm-queue-2.6.32 which might be from
[email protected] are
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