On Thu, 24 Feb 2011, Thomas Gleixner wrote: > 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. Most SMP ARM processors are going to use it soon. Powering down idle cores provides substantial power saving. Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
