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rcu: Move SRCU grace period work to power efficient workqueue

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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 <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Dipankar Sarma <[email protected]>
Signed-off-by: Shaibal Dutta <[email protected]>
[[email protected]: Rebased to latest kernel version. Added commit
message. Fixed code alignment.]
Signed-off-by: Zoran Markovic <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Josh Triplett <[email protected]>
This commit is contained in:
Shaibal Dutta 2014-01-31 11:53:06 -08:00 • committed by Paul E. McKenney
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);
}
/*