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

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Message-ID: <YxHClIhy1RPLT8P4@hirez.programming.kicks-ass.net>
Date:   Fri, 2 Sep 2022 10:45:08 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Vincent Donnefort <vdonnefort@...gle.com>,
        Quentin Perret <qperret@...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 Fri, Sep 02, 2022 at 09:53:22AM +0200, Dietmar Eggemann wrote:
> >  void update_rq_clock(struct rq *rq)
> > --- a/kernel/sched/features.h
> > +++ b/kernel/sched/features.h
> > @@ -101,3 +101,6 @@ SCHED_FEAT(LATENCY_WARN, false)
> >  
> >  SCHED_FEAT(ALT_PERIOD, true)
> >  SCHED_FEAT(BASE_SLICE, true)
> > +
> > +SCHED_FEAT(PELT_M2, false)
> > +SCHED_FEAT(PELT_M4, false)
> 
> The sched features interface would definitely be much less official but
> I think it's not useful for Android since they don't mount debugfs anymore.

Well, they can haz a small patch that sets either one or both to true,
no?