Re: [PATCH v5 09/14] sched: Add over-utilization/tipping point indicator

[Quentin Perret]

On Thursday 09 Aug 2018 at 11:30:57 (+0200), Vincent Guittot wrote:
> On Tue, 24 Jul 2018 at 14:26, Quentin Perret <quentin.perret@xxxxxxx> wrote:
> >
> > From: Morten Rasmussen <morten.rasmussen@xxxxxxx>
> >
> > Energy-aware scheduling is only meant to be active while the system is
> > _not_ over-utilized. That is, there are spare cycles available to shift
> > tasks around based on their actual utilization to get a more
> > energy-efficient task distribution without depriving any tasks. When
> > above the tipping point task placement is done the traditional way based
> > on load_avg, spreading the tasks across as many cpus as possible based
> > on priority scaled load to preserve smp_nice. Below the tipping point we
> > want to use util_avg instead. We need to define a criteria for when we
> > make the switch.
> >
> > The util_avg for each cpu converges towards 100% (1024) regardless of
> 
> remove the "(1024)" because util_avg converges to max cpu capacity
> which can be different from 1024

Good point, will be fixed in v6.

Thanks,
Quentin