linux-kernel - Re: [PATCH V2 0/3] Introduce Thermal Pressure

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Message-ID: <20190424163424.GG4038@hirez.programming.kicks-ass.net>
Date:   Wed, 24 Apr 2019 18:34:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Thara Gopinath <thara.gopinath@...aro.org>, mingo@...hat.com,
        rui.zhang@...el.com, linux-kernel@...r.kernel.org,
        amit.kachhap@...il.com, viresh.kumar@...aro.org,
        javi.merino@...nel.org, edubezval@...il.com,
        daniel.lezcano@...aro.org, vincent.guittot@...aro.org,
        nicolas.dechesne@...aro.org, bjorn.andersson@...aro.org,
        dietmar.eggemann@....com, Quentin Perret <quentin.perret@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH V2 0/3] Introduce Thermal Pressure

On Wed, Apr 17, 2019 at 08:29:32PM +0200, Ingo Molnar wrote:
> Assuming PeterZ & Rafael & Quentin doesn't hate the whole thermal load 
> tracking approach. 

I seem to remember competing proposals, and have forgotten everything
about them; the cover letter also didn't have references to them or
mention them in any way.

As to the averaging and period, I personally prefer a PELT signal with
the windows lined up, if that really is too short a window, then a PELT
like signal with a natural multiple of the PELT period would make sense,
such that the windows still line up nicely.

Mixing different averaging methods and non-aligned windows just makes me
uncomfortable.