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sched: Fix volanomark performance regression

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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>
This commit is contained in:
Alex Shi 2010-11-16 17:34:02 +08:00 committed by Ingo Molnar
parent 55f6561c69
commit b5482cfa1c
1 changed files with 0 additions and 4 deletions
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4
kernel/sched_fair.c
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@ -1758,10 +1758,6 @@ 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;
}
/*