linux-kernel - Re: [PATCH v3] sched/fair: update scale invariance of PELT

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Message-ID: <20180518101738.GM30654@e110439-lin>
Date:   Fri, 18 May 2018 11:17:38 +0100
From:   Patrick Bellasi <patrick.bellasi@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>, mingo@...nel.org,
        linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
        Morten.Rasmussen@....com, yuyang.du@...el.com, pjt@...gle.com,
        bsegall@...gle.com, "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v3] sched/fair: update scale invariance of PELT

On 18-May 11:36, Peter Zijlstra wrote:
> 
> Replying to the latest version available; given the current interest I
> figure I'd re-read some of the old threads and look at this stuff again.
> 
> On Fri, Apr 28, 2017 at 04:23:55PM +0200, Vincent Guittot wrote:
> 
> > diff --git a/include/linux/sched.h b/include/linux/sched.h
> > index 0978fb7..f8dde36 100644
> > --- a/include/linux/sched.h
> > +++ b/include/linux/sched.h
> > @@ -313,6 +313,7 @@ struct load_weight {
> >   */
> >  struct sched_avg {
> >  	u64				last_update_time;
> > +	u64				stolen_idle_time;
> >  	u64				load_sum;
> >  	u32				util_sum;
> >  	u32				period_contrib;
> 
> Right, so sadly Patrick stole that space with the util_est bits.

Sorry :(

However, I remember we already talked about the idea to
update load_avg and runnable_load_avg to use u32:

   https://marc.info/?l=linux-kernel&m=151334269426419&w=2

-- 
#include <best/regards.h>

Patrick Bellasi