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

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Message-ID: <20110224210431.7a6bba68@lxorguk.ukuu.org.uk>
Date:	Thu, 24 Feb 2011 21:04:31 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Peter Zijlstra <peterz@...radead.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

> That's the equivalent of physical hotplug, but we still have all the
> memory state around, so it is possible from idle, when we have the

All sorts of other state goes walking as well though - on die device
state for example like the GPU context may well also evaporate or
disappear except for the minimum needed for scanout.

It's not just about the CPU its a system (albeit a SoC in most cases)
going to sleep lock stock and barrel except for IRQ notifications, and in
some cases things like offloaded audio playback.

Alan
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