* [PATCH 26/28] sched: Fix volanomark performance regression
@ 2011-02-10 9:23 stable-bot for Alex Shi
0 siblings, 0 replies; only message in thread
From: stable-bot for Alex Shi @ 2011-02-10 9:23 UTC (permalink / raw)
To: stable; +Cc: linux-kernel, Peter Zijlstra, Ingo Molnar
Commit: b5482cfa1c95a188b3054fa33274806add91bbe5 upstream
Author: Alex Shi <alex.shi@intel.com>
AuthorDate: Tue Nov 16 17:34:02 2010 +0800
Commit fab4762 triggers excessive idle balancing, causing a ~30% loss in
volanomark throughput. Remove idle balancing throttle reset.
Originally-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Nikhil Rao <ncrao@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1289928732.5169.211.camel@maggy.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
kernel/sched.c | 4 ----
1 files changed, 0 insertions(+), 4 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 445f2d1..ffd4f57 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3326,10 +3326,6 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
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;
}
/*
--
1.7.4
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