Commit ae167033 authored Jan 31, 2014 by Shaibal Dutta Committed by Paul E. McKenney Feb 17, 2014

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: Shaibal Dutta <shaibal.dutta@broadcom.com>
[zoran.markovic@linaro.org: Rebased to latest kernel version. Added commit
message. Fixed code alignment.]
Signed-off-by: Zoran Markovic <zoran.markovic@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh 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);
		}

		/*

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