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

From: Sergei Shtylyov <[email-masked]>
Date: Fri, 31 Jan 2014 17:10:58 +0400

Hello.

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

> From: Shaibal Dutta <[email-masked]>

> 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" <[email-masked]>
> Cc: Alexey Kuznetsov <[email-masked]>
> Cc: James Morris <[email-masked]>
> Cc: Hideaki YOSHIFUJI <[email-masked]>
> Cc: Patrick McHardy <[email-masked]>
> Signed-off-by: Shaibal Dutta <[email-masked]>
> [[email-masked]: Rebased to latest kernel version. Added
> commit message.]
> Signed-off-by: Zoran Markovic <[email-masked]>
> ---
>   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