sched: walt: use_cycle_counter check before rq lock held



use_cycle_counter is not necessary need held
rq lock, so check use_cycle_counter before rq
lock in sched_account_irqstart to eliminate
unnecessary rq lock and unlock.

Change-Id: Ie0f3d87b746dffbb418dd5d8b2e1892adac2ba16
Signed-off-by: Maria Yu <aiquny@codeaurora.org>

parent eddc683b

kernel/sched/walt.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -363,6 +363,13 @@ void sched_account_irqstart(int cpu, struct task_struct *curr, u64 wallclock)
		if (!rq->window_start \|\| sched_disable_window_stats)
		return;

		/*
		* We don’t have to note down an irqstart event when cycle
		* counter is not used.
		*/
		if (!use_cycle_counter)
		return;

		if (is_idle_task(curr)) {
		/* We're here without rq->lock held, IRQ disabled */
		raw_spin_lock(&rq->lock);