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

From: Alan Cox
Date: Thu Feb 24 2011 - 16:02:30 EST

> 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.

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