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

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Message-ID: <CAKohpomtNWZTn4zhf3og=Ff8LvBMH_68tLNgYLOyBK5Az6WXuA@mail.gmail.com>
Date:	Wed, 15 Jan 2014 16:17:26 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
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 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.

And then there were timer overflow events that occur because hrtimer
is started by tick-sched stuff for 450 seconds later in time.

--
viresh
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