On Thu, 24 Feb 2011, Nicolas Pitre wrote: > 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. 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 full isolation features in place. Thanks, tglx -- 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
