linux-kernel - Re: [RFC PATCH 1/1] sched/pelt: Introduce PELT multiplier

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Message-ID: <Ywzf1axLAnLIqRP0@google.com>
Date:   Mon, 29 Aug 2022 15:48:37 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Vincent Donnefort <vdonnefort@...gle.com>,
        Patrick Bellasi <patrick.bellasi@...bug.net>,
        Abhijeet Dharmapurikar <adharmap@...cinc.com>,
        Jian-Min <Jian-Min.Liu@...iatek.com>,
        Qais Yousef <qais.yousef@....com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/1] sched/pelt: Introduce PELT multiplier

On Monday 29 Aug 2022 at 16:34:39 (+0200), Peter Zijlstra wrote:
> On Mon, Aug 29, 2022 at 02:23:17PM +0000, Quentin Perret wrote:
> 
> > I'll let folks in CC comment about their use-case in more details, but
> > there's definitely been an interest in tuning this thing at run-time
> 
> An interest and it making sense are two very distinct things that bear
> no relation to one another in any way.

And just to clarify something here as my first message was misleading,
the run-time tuning of PELT HLs has been used in some Android products
for a little while already, so it's more than just a mere 'interest'.

That doesn't close the debate on whether this makes any sense, but I
figured this should be mentioned :-)