linux-kernel - Re: [PATCH V2 3/3] workqueue: Schedule work on non-idle cpu instead of current one

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Message-ID: <20121001003233.GL10383@mtj.dyndns.org>
Date:	Mon, 1 Oct 2012 09:32:33 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linux-kernel@...r.kernel.org, pjt@...gle.com,
	paul.mckenney@...aro.org, tglx@...utronix.de,
	suresh.b.siddha@...el.com, venki@...gle.com, mingo@...hat.com,
	peterz@...radead.org, robin.randhawa@....com,
	Steve.Bannister@....com, Arvind.Chauhan@....com,
	amit.kucheria@...aro.org, vincent.guittot@...aro.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org
Subject: Re: [PATCH V2 3/3] workqueue: Schedule work on non-idle cpu instead
 of current one

Hello,

On Sun, Sep 30, 2012 at 05:46:45PM +0530, Viresh Kumar wrote:
> For the scheduler CPU is idle, if all below are true:
> - current task is idle task
> - nr_running == 0
> - wake_list is empty
> 
> And during these conditions, there can be a timer running in background.
> And when we reach its interrupt handler, then also these conditions hold true
> and local cpu is idle.

It isn't about the CPU being actually idle?  Also, if it's only about
timers, shouldn't it be enough to implement it for timer and
delayed_work?

It would be great if you explain what you're trying to achieve how.  I
can't tell what you're aiming for and why that would be beneficial
from these submissions.

Thanks.

-- 
tejun
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