linux-kernel - Re: [QUERY]: Is using CPU hotplug right for isolating CPUs?

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Date:	Fri, 28 Feb 2014 14:34:42 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Frédéric Weisbecker <fweisbec@...il.com>,
	Kevin Hilman <khilman@...aro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Linaro Networking <linaro-networking@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [QUERY]: Is using CPU hotplug right for isolating CPUs?

On 15 January 2014 17:04, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, Jan 15, 2014 at 04:17:26PM +0530, Viresh Kumar wrote:
>> On 15 January 2014 16:08, Peter Zijlstra <peterz@...radead.org> wrote:
>> > Nah, its just ugly and we should fix it. You need to be careful to not
>> > place tasks in a cpuset you're going to unplug though, that'll give
>> > funny results.
>>
>> Okay. So how do you suggest to get rid of cases like a work queued
>> on CPU1 initially and because it gets queued again from its work handler,
>> it stays on the same CPU forever.
>
> We should have a cpuset.quiesce control or something that moves all
> timers out.

What should we do here if we have a valid base->running_timer for the
cpu requesting the quiesce ?
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