linux-kernel - Re: [PATCH 01/15] sched/fair: Add avg

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Message-ID: <20231011130851.GF6337@noisy.programming.kicks-ass.net>
Date:   Wed, 11 Oct 2023 15:08:51 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Abel Wu <wuyun.abel@...edance.com>
Cc:     mingo@...nel.org, vincent.guittot@...aro.org,
        linux-kernel@...r.kernel.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, corbet@....net,
        qyousef@...alina.io, chris.hyser@...cle.com,
        patrick.bellasi@...bug.net, pjt@...gle.com, pavel@....cz,
        qperret@...gle.com, tim.c.chen@...ux.intel.com, joshdon@...gle.com,
        timj@....org, kprateek.nayak@....com, yu.c.chen@...el.com,
        youssefesmat@...omium.org, joel@...lfernandes.org, efault@....de,
        tglx@...utronix.de
Subject: Re: [PATCH 01/15] sched/fair: Add avg_vruntime

On Wed, Oct 11, 2023 at 09:30:01AM +0200, Peter Zijlstra wrote:
> On Wed, Oct 11, 2023 at 12:15:28PM +0800, Abel Wu wrote:
> > On 5/31/23 7:58 PM, Peter Zijlstra wrote:
> > > +/*
> > > + * Compute virtual time from the per-task service numbers:
> > > + *
> > > + * Fair schedulers conserve lag:
> > > + *
> > > + *   \Sum lag_i = 0
> > > + *
> > > + * Where lag_i is given by:
> > > + *
> > > + *   lag_i = S - s_i = w_i * (V - v_i)
> > 
> > Since the ideal service time S is task-specific, should this be:
> > 
> > 	lag_i = S_i - s_i = w_i * (V - v_i)
> 

Yes, it should be. Clearly I was delusional this morning.