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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>
This commit is contained in:
Shaibal Dutta 2014-01-31 11:53:06 -08:00 committed by Paul E. McKenney
parent 52e2bb958a
commit ae1670339c
1 changed files with 3 additions and 2 deletions
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5
kernel/rcu/srcu.c
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@ -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);
}
/*