Re: [PATCH V3 4/7] PHYLIB: queue work on any cpu

[David Miller]

From: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Date: Mon, 18 Mar 2013 20:53:26 +0530

> Phylib uses workqueues for multiple purposes. There is no real dependency of
> scheduling these on the cpu which scheduled them.
> 
> On a idle system, it is observed that and idle cpu wakes up many times just to
> service this work. It would be better if we can schedule it on a cpu which isn't
> idle to save on power.
> 
> By idle cpu (from scheduler's perspective) we mean:
> - Current task is idle task
> - nr_running == 0
> - wake_list is empty
> 
> This patch replaces the schedule_work() and schedule_delayed_work() routines
> with their queue_[delayed_]work_on_any_cpu() siblings with system_wq as
> parameter.
> 
> These routines would look for the closest (via scheduling domains) non-idle cpu
> (non-idle from schedulers perspective). If the current cpu is not idle or all
> cpus are idle, work will be scheduled on local cpu.
> 
> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> Cc: netdev@xxxxxxxxxxxxxxx
> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>

This will need to be applied to whatever tree adds these new interfaces,
and for that:

Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
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