linux-kernel - Re: [Query]: tick-sched: why don't we stop tick when we are running idle task?

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Date:	Mon, 14 Apr 2014 15:18:30 +0530
From:	Preeti Murthy <preeti.lkml@...il.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Subject: Re: [Query]: tick-sched: why don't we stop tick when we are running
 idle task?

Hi Viresh,

I am not too sure about the complexity or the worthiness of this patch but
just wanted to add that care must be taken to migrate the tick_sched_timer
of all the remote CPUs off a hotplugged out CPU if the latter was keeping
their time thus far. In the normal scenario I am guessing the tick_sched_timer
dies along with the hotplugged out CPU since there is no need for it any more.

Regards
Preeti U Murthy
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