Messages in this thread | | | Date | Thu, 24 Feb 2011 21:16:01 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [PATCH V5 2/2] tracing, perf : add cpu hotplug trace events |
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On Thu, 24 Feb 2011, Alan Cox wrote:
> > Anybody who is interested in the latency of cpu hotplug is deluding > > himself, also cpu hotplug is _NOT_ a power management feature, so the > > rest of your justification just disappeared as well. > > Actually CPU hotplug is a power management feature on some devices where > you need to shutdown one of the cores to enter low power modes.
Right.
> Remember we use it as part of the suspend paths and various processors > nowdays drop into a suspend to RAM type state on CPU idling.
The suspend path is using it, but the cpu idle one is hardly using the hotplug muck.
Thanks,
tglx
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