Commit ef8002f6 authored Oct 13, 2010 by Nikhil Rao Committed by Ingo Molnar Oct 18, 2010

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 <ncrao@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1287173550-30365-2-git-send-email-ncrao@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 17bdcf94

kernel/sched.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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:
		*/