linux-kernel - Re: [PATCH] sched/fair: util_est: fast ramp-up EWMA on utilization increases

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Message-ID: <20191017082537.GX2328@hirez.programming.kicks-ass.net>
Date:   Thu, 17 Oct 2019 10:25:37 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Douglas Raillard <douglas.raillard@....com>
Cc:     Patrick Bellasi <patrick.bellasi@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Quentin Perret <quentin.perret@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH] sched/fair: util_est: fast ramp-up EWMA on utilization
 increases

On Mon, Oct 14, 2019 at 05:16:02PM +0100, Douglas Raillard wrote:

> random idea: Since these things are much easier to understand by looking at a graph
> of util over time, we may agree on some mailing-list-friendly way to convey graphs.

I don't think that this patch warrants something like that. It is fairly
clear what it does.

For other stuff, maybe.

> For example, a simple CSV with:
> * before/after delimiters (line of # or =)
> * graph title
> * one point per signal transition, so that it can be plotted with gnuplot style "steps" or matplotlib drawstyle='steps-post'
> * consistent column names:
>    - time: in seconds (scientific notation for nanoseconds)
>    - activation: 1 when the task is actually running, 0 otherwise
>     (so it can be turned into transparent coloured bands like using gnuplot filledcurves, like in [1])
>    - util: util_avg of the task being talked about
> 
> The delimiters allow writing a scripts to render graphs directly out of an mbox file or ML archive URL.
> This won't solve the issue for the commit message itself, but that may ease the ML discussions.

Something like that could work; mutt can easily pipe emails into
scripts. OTOH gnuplot also has ASCII output, so one can easily stick
something like that into email.