From: Nikhil Rao Date: Wed, 13 Oct 2010 19:09:35 +0000 (-0700) Subject: sched: Do not consider SCHED_IDLE tasks to be cache hot X-Git-Tag: v2.6.37-rc1~45^2~14 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ef8002f6848236de5adc613063ebeabddea8a6fb;p=platform%2Fkernel%2Flinux-exynos.git 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 workloads, are typically scheduled many milliseconds apart. There is no need to consider these tasks hot for load balancing. Signed-off-by: Nikhil Rao Signed-off-by: Peter Zijlstra LKML-Reference: <1287173550-30365-2-git-send-email-ncrao@google.com> Signed-off-by: Ingo Molnar --- diff --git a/kernel/sched.c b/kernel/sched.c index 728081a..771b518 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2025,6 +2025,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd) if (p->sched_class != &fair_sched_class) return 0; + if (unlikely(p->policy == SCHED_IDLE)) + return 0; + /* * Buddy candidates are cache hot: */