On Thu, Jul 13, 2017 at 07:02:37PM -0700, Saravana Kannan wrote: > In all Qualcomm chipsets (well, at least the ones that have been used in > Android devices so far), we can switch the frequency of any CPU from any > other CPU. If we can do that even without fast switching, why wouldn't any > theoretical fast switching be incapable of supporting this? Is this a > limitation specific to x86 that we are assuming all architectures and > platforms are going to have?
So the typical implementation of fast switching we're thinking of is the CPU writing the DVFS request into a machine register. Now machine registers are typically per logical CPU. What style of fast switching were you thinking of?
