linux-kernel - Re: [RFC PATCH] net: ipv4: move inetpeer garbage collector work to power efficient workqueue

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Message-ID: <52EBA0E2.7050208@cogentembedded.com>
Date:	Fri, 31 Jan 2014 17:10:58 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Zoran Markovic <zoran.markovic@...aro.org>,
	linux-kernel@...r.kernel.org
CC:	netdev@...r.kernel.org, Shaibal Dutta <shaibal.dutta@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [RFC PATCH] net: ipv4: move inetpeer garbage collector work to
 power efficient workqueue

Hello.

On 31-01-2014 3:40, Zoran Markovic wrote:

> From: Shaibal Dutta <shaibal.dutta@...adcom.com>

> Garbage collector work does not have to be bound to the CPU that scheduled
> it. By moving work to the power-efficient workqueue, the selection of
> CPU executing the work is left to the scheduler. This extends idle
> residency times and conserves power.

> This functionality is enabled when CONFIG_WQ_POWER_EFFICIENT is selected.

> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
> Cc: James Morris <jmorris@...ei.org>
> Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
> Cc: Patrick McHardy <kaber@...sh.net>
> Signed-off-by: Shaibal Dutta <shaibal.dutta@...adcom.com>
> [zoran.markovic@...aro.org: Rebased to latest kernel version. Added
> commit message.]
> Signed-off-by: Zoran Markovic <zoran.markovic@...aro.org>
> ---
>   net/ipv4/inetpeer.c |    6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)

> diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
> index 48f4244..87155aa 100644
> --- a/net/ipv4/inetpeer.c
> +++ b/net/ipv4/inetpeer.c
> @@ -161,7 +161,8 @@ static void inetpeer_gc_worker(struct work_struct *work)
>   	list_splice(&list, &gc_list);
>   	spin_unlock_bh(&gc_lock);
>
> -	schedule_delayed_work(&gc_work, gc_delay);
> +	queue_delayed_work(system_power_efficient_wq,
> +		&gc_work, gc_delay);

    Please align the continuation line under the next character after ( on the 
broken up line.

> @@ -576,7 +577,8 @@ static void inetpeer_inval_rcu(struct rcu_head *head)
>   	list_add_tail(&p->gc_list, &gc_list);
>   	spin_unlock_bh(&gc_lock);
>
> -	schedule_delayed_work(&gc_work, gc_delay);
> +	queue_delayed_work(system_power_efficient_wq,
> +		&gc_work, gc_delay);

    Same here. This is according to networking coding style.

WBR, Sergei

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