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

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Message-ID: <CAKohpommw4=LcyYKvj8rNJgUkOT+_Gh=1kppcDQYm3BuQQe_Qg@mail.gmail.com>
Date:	Tue, 11 Feb 2014 14:22:43 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linaro Networking <linaro-networking@...aro.org>,
	Kevin Hilman <khilman@...aro.org>
Subject: Re: [QUERY]: Is using CPU hotplug right for isolating CPUs?

On 28 January 2014 18:53, Frederic Weisbecker <fweisbec@...il.com> wrote:
> No, when a single task is running on a full dynticks CPU, the tick is supposed to run
> every seconds. I'm actually suprised it doesn't happen in your traces, did you tweak
> something specific?

Why do we need this 1 second tick currently? And what will happen if I
hotunplug that
CPU and get it back? Would the timer for tick move away from CPU in
question? I see
that when I have changed this 1sec stuff to 300 seconds. But what
would be impact
of that? Will things still work normally?
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