On Thu, 2011-02-24 at 15:40 -0500, 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. Not much of it, > We're talking > about cores completely going down with power pulled beneath them and > eventually rebooted dynamically here. I think you can get away with actually pulling the power and re-initing the cpu to idle from the idle path and the rest of the kernel not caring. -- 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
