linux-kernel - Re: [PATCH V5 2/2] tracing, perf : add cpu hotplug trace events

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Date:	Thu, 24 Feb 2011 22:33:03 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-hotplug@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>, amit.kucheria@...aro.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH V5 2/2] tracing, perf : add cpu hotplug trace events

On Thu, 24 Feb 2011, Peter Zijlstra wrote:

> On Thu, 2011-02-24 at 22:12 +0100, Thomas Gleixner wrote:
> 
> > If you take down the whole SoC, then it's full S2RAM or some
> > equivilant thing. That's a different story and propably requires the
> > whole hotplug muck.
> 
> Didn't we, during the whole wakelock trainwreck, that s2ram could be
> done from idle as well (for hardware where the whole opportunistic
> suspend was sensible to begin with)?

Yes, needs some more changes to the whole infrastructure of clocks and
power gates, but it's doable.

Thanks,

	tglx
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