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Date: Mon, 27 Sep 2010 17:29:58 -0700 From: Nikhil Rao <ncrao@...gle.com> To: Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>, Mike Galbraith <efault@....de> Cc: Venkatesh Pallipadi <venki@...gle.com>, linux-kernel@...r.kernel.org, Nikhil Rao <ncrao@...gle.com> Subject: [PATCH 3/3] sched: do not consider SCHED_IDLE tasks to be cache hot This patch adds a check in task_hot to return if the task has SCHED_IDLE policy. SCHED_IDLE tasks have very low weight, and when run with regular weight tasks, are typically scheduled many milliseconds apart. There is no benefit from considering SCHED_IDLE tasks cache hot for load balancing. Signed-off-by: Nikhil Rao <ncrao@...gle.com> --- kernel/sched.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index ed09d4f..874efde 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2003,6 +2003,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd) if (p->sched_class != &fair_sched_class) return 0; + if (p->policy == SCHED_IDLE) + return 0; + /* * Buddy candidates are cache hot: */ -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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