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

[Peter Zijlstra]

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.

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