Commit 8ee25ad0 authored May 01, 2018 by Runmin Wang

sched/core: Fix an ordering issue in wake_up_new_task

If a task is activated before the window_start on the rq is initialized,
its ravg would get reset to 0. However, the init load on this task is
already pushed into the cumulative_runnable_avg. When the task is dequeued,
the task demand (which is reset to 0) will be removed from the
cumulative_runnable_avg, and as a result, the init load will be left
on the runqueue and cra will not be 0 even when CPU is idle.

Change-Id: I7619206dde275f7b64bfcfed206bf0c9a7245cf9
Signed-off-by: Runmin Wang <runminw@codeaurora.org>

parent e98003de

kernel/sched/core.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2573,8 +2573,8 @@ void wake_up_new_task(struct task_struct *p)
		update_rq_clock(rq);
		post_init_entity_util_avg(&p->se);

		activate_task(rq, p, ENQUEUE_NOCLOCK);
		mark_task_starting(p);
		activate_task(rq, p, ENQUEUE_NOCLOCK);

		p->on_rq = TASK_ON_RQ_QUEUED;
		trace_sched_wakeup_new(p);