From 49ceee8e2c862edda47abe0d1e2e2583178e2ea6 Mon Sep 17 00:00:00 2001 From: Shaibal Dutta Date: Fri, 31 Jan 2014 11:53:06 -0800 Subject: [PATCH] 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 Cc: "Paul E. McKenney" Cc: Dipankar Sarma Signed-off-by: Shaibal Dutta [zoran.markovic@linaro.org: Rebased to latest kernel version. Added commit message. Fixed code alignment.] Signed-off-by: Zoran Markovic Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett --- kernel/rcu/srcu.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c index 5db7e9272d379..2359779e1daac 100644 --- a/kernel/rcu/srcu.c +++ b/kernel/rcu/srcu.c @@ -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); } /* -- 2.39.5