On Wed, 2011-08-10 at 13:03 -0700, Mike Turquette wrote: > This patch series introduces a new cpumask which tracks CPUs that > support hotplugging. The purpose of this patch series is to provide a > simple method for kernel code to know which CPUs can be hotplugged and > which ones cannot. Potential users of this code might be a thermal > mitigation technique which uses hotplug to lower temperature, or a power > capping mechanism which uses hotplug to lower power consumption. > > All the of usual cpumask helper functions are created for this new mask. > The second patch in this series simply sets the bit for elligible CPUs > while they are being registered. The cpumask itself is static after > boot and should not change (like the possbile mask). I still most strongly object to people using hotplug for these goals. Why do you need to go through the entire dance of hotplug just to idle a cpu? Hotplug not only idles the cpu but tears down (and rebuilds) an insane amount of resources associated with the cpu. Nacked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
