Re: [Eas-dev] [PATCH V4 0/3] sched: cpufreq: Allow remote callbacks

[Juri Lelli]

Hi,

On 26/07/17 23:23, Joel Fernandes (Google) wrote:
> Hi Viresh,
> 
> On Wed, Jul 26, 2017 at 10:46 PM, Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote:
> > On 26-07-17, 22:14, Joel Fernandes (Google) wrote:

[...]

> >
> > But even without that, if you see the routine
> > init_entity_runnable_average() in fair.c, the new tasks are
> > initialized in a way that they are seen as heavy tasks. And so even
> > for the first time they run, freq should normally increase on the
> > target CPU (at least with above application).i
> 
> Ok, but the "heavy" in init_entity_runnable_average means for load,
> not the util_avg. The util_avg is what's used for frequency scaling
> IIUC and is set to 0 in that function no?
> 

True for init_entity_runnable_average(), but for new task post_init_
entity_util_avg() is then also called (from wake_up_new_task()), which
modifies the initial util_avg value (depending on current rq {util,
load}_avg.