linux-kernel - Re: [PATCH V2 Resend 0/4] Create sched_select_cpu() and use it for workqueues and timers

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Message-ID: <CAKohponTxs983vVQV=6Q8zyesC1W1FhFkzfmpAVeEwU-cQXohA@mail.gmail.com>
Date:	Mon, 26 Nov 2012 20:30:56 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	pjt@...gle.com, paul.mckenney@...aro.org, tglx@...utronix.de,
	tj@...nel.org, suresh.b.siddha@...el.com, venki@...gle.com,
	mingo@...hat.com, peterz@...radead.org, rostedt@...dmis.org
Cc:	Arvind.Chauhan@....com, linaro-dev@...ts.linaro.org,
	patches@...aro.org, pdsw-power-team@....com,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH V2 Resend 0/4] Create sched_select_cpu() and use it for
 workqueues and timers

On 6 November 2012 16:08, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> This is V2 Resend of my sched_select_cpu() work. Resend because didn't got much
> attention on V2. Including more guys now in cc :)
>
> In order to save power, it would be useful to schedule work onto non-IDLE cpus
> instead of waking up an IDLE one.
>
> To achieve this, we need scheduler to guide kernel frameworks (like: timers &
> workqueues) on which is the most preferred CPU that must be used for these
> tasks.
>
> This patchset is about implementing this concept.
>
> - The first patch adds sched_select_cpu() routine which returns the preferred
>   cpu which is non-idle.
> - Second patch removes idle_cpu() calls from timer & hrtimer.
> - Third patch is about adapting this change in workqueue framework.
> - Fourth patch add migration capability in running timer
>
> Earlier discussions over v1 can be found here:
> http://www.mail-archive.com/linaro-dev@lists.linaro.org/msg13342.html
>
> Earlier discussions over this concept were done at last LPC:
> http://summit.linuxplumbersconf.org/lpc-2012/meeting/90/lpc2012-sched-timer-workqueue/
>
> Module created for testing this behavior is present here:
> http://git.linaro.org/gitweb?p=people/vireshk/module.git;a=summary

Ping!!

--
viresh
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