Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ae167033 authored by Shaibal Dutta's avatar Shaibal Dutta Committed by Paul E. McKenney
Browse files

rcu: Move SRCU grace period work to power efficient workqueue 



For better use of CPU idle time, allow the scheduler to select the CPU
on which the SRCU grace period work would be scheduled. This improves
idle residency time and conserves power.

This functionality is enabled when CONFIG_WQ_POWER_EFFICIENT is selected.

Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: default avatarShaibal Dutta <shaibal.dutta@broadcom.com>
[zoran.markovic@linaro.org: Rebased to latest kernel version. Added commit
message. Fixed code alignment.]
Signed-off-by: default avatarZoran Markovic <zoran.markovic@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent 52e2bb95

kernel/rcu/srcu.c

+3 −2
Original line number Diff line number Diff line
@@ -398,7 +398,7 @@ void call_srcu(struct srcu_struct *sp, struct rcu_head *head, 
	rcu_batch_queue(&sp->batch_queue, head);

	if (!sp->running) {

		sp->running = true;

		schedule_delayed_work(&sp->work, 0);

		queue_delayed_work(system_power_efficient_wq, &sp->work, 0);

	}

	spin_unlock_irqrestore(&sp->queue_lock, flags);

}
@@ -674,7 +674,8 @@ static void srcu_reschedule(struct srcu_struct *sp) 
	}



	if (pending)

		schedule_delayed_work(&sp->work, SRCU_INTERVAL);

		queue_delayed_work(system_power_efficient_wq,

				   &sp->work, SRCU_INTERVAL);

}



/*