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Commit 213c8af6 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: small schedstat fix 



small schedstat fix: the cfs_rq->wait_runtime 'sum of all runtimes'
statistics counters missed newly forked tasks and thus had a constant
negative skew. Fix this.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
parent b77d69db

kernel/sched_fair.c

+3 −1
Original line number Diff line number Diff line
@@ -1121,8 +1121,10 @@ static void task_new_fair(struct rq *rq, struct task_struct *p) 
	 * The statistical average of wait_runtime is about

	 * -granularity/2, so initialize the task with that:

	 */

	if (sysctl_sched_features & SCHED_FEAT_START_DEBIT)

	if (sysctl_sched_features & SCHED_FEAT_START_DEBIT) {

		p->se.wait_runtime = -(sched_granularity(cfs_rq) / 2);

		schedstat_add(cfs_rq, wait_runtime, se->wait_runtime);

	}



	__enqueue_entity(cfs_rq, se);

}