| Date | Tue, 15 Feb 2011 17:46:17 -0800 | From | Greg KH <> | Subject | [111/115] sched: Fix volanomark performance regression |
| |
2.6.32-longterm review patch. If anyone has any objections, please let us know.
------------------
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 <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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- 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; } /*
|