linux-kernel - Re: [RFC PATCH] rcu: move SRCU grace period work to power efficient workqueue

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Message-ID: <52F8A51F.4090909@cn.fujitsu.com>
Date:	Mon, 10 Feb 2014 18:08:31 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Zoran Markovic <zoran.markovic@...aro.org>
CC:	linux-kernel@...r.kernel.org,
	Shaibal Dutta <shaibal.dutta@...adcom.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>
Subject: Re: [RFC PATCH] rcu: move SRCU grace period work to power efficient
 workqueue

Acked-by: Lai Jiangshan <laijs@...fujitsu.com>

On 02/01/2014 03:53 AM, Zoran Markovic wrote:
> From: Shaibal Dutta <shaibal.dutta@...adcom.com>
> 
> 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@...fujitsu.com>
> Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> Cc: Dipankar Sarma <dipankar@...ibm.com>
> Signed-off-by: Shaibal Dutta <shaibal.dutta@...adcom.com>
> [zoran.markovic@...aro.org: Rebased to latest kernel version. Added commit
> message. Fixed code alignment.]
> ---
>  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 3318d82..a1ebe6d 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);
>  }
>  
>  /*

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