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SubjectRe: [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 15:24 -0500, Nicolas Pitre wrote:
>
> > Most SMP ARM processors are going to use it soon. Powering down idle
> > cores provides substantial power saving.
>
> And why can't regular idle paths be used? CPU hotplug is a massively
> expensive operation.

The idle path assumes that the CPU state is preserved. We're talking
about cores completely going down with power pulled beneath them and
eventually rebooted dynamically here.


Nicolas


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