On Tue, Mar 21, 2017 at 02:37:08PM +0100, Vincent Guittot wrote: > On 21 March 2017 at 14:22, Peter Zijlstra <pet...@infradead.org> wrote:
> For the not overloaded case, it makes sense to immediately update to > OPP to be aligned with the new utilization of the CPU even if it was > not idle in the past couple of ticks Yeah, but we cannot know. Also, who cares? > > does exactly that. Note that the lack of idle time is an exact > > equivalent of 100% utilized. > > > > So even while we cannot currently detect the 100% utilized state through > > the running state tracking; because averages etc.. we can detect the > > lack of idle time. > > But after how much lack of idle time do we consider that we are overloaded ? 0 :-) Note that utilization is an absolute metric, not a windowed one. That is, there is no actual time associated with it. Now, for practical purposes we end up using windowed things in many places,
