linux-kernel - Re: [PATCH 1/1] sched/deadline: Fix fair

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Message-ID: <9d521010878acd1d8f1b1b1380610459a746066f.camel@mediatek.com>
Date: Tue, 17 Jun 2025 14:41:53 +0000
From: Kuyo Chang (張建文) <Kuyo.Chang@...iatek.com>
To: "juri.lelli@...hat.com" <juri.lelli@...hat.com>, "peterz@...radead.org"
	<peterz@...radead.org>
CC: "bsegall@...gle.com" <bsegall@...gle.com>, "vschneid@...hat.com"
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Subject: Re: [PATCH 1/1] sched/deadline: Fix fair_server runtime calculation
 formula

On Tue, 2025-06-17 at 16:23 +0200, Juri Lelli wrote:
> 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> On 17/06/25 16:14, Peter Zijlstra wrote:
> > On Tue, Jun 17, 2025 at 02:33:15PM +0200, Juri Lelli wrote:
> 
> ...
> 
> > > To me it looks like we want this (no scaling) for fair_server
> > > (and
> > > possibly scx_server?) as for them we are only looking into a
> > > 'fixed
> > > time' type of isolation. Full fledged servers (hierarchical
> > > scheduling)
> > > maybe have it configurable, or enabled by default as a start (as
> > > we have
> > > it today).
> > 
> > Right. Then we should write the above like:
> > 
> >       scaled_delta_exec = delta_exec;
> >       if (!dl_se->dl_server)
> >               scaled_delta_exec = dl_scaled_delta_exec(rq, dl_se,
> > delta_exec);
> > 
> > and let any later server users add bits on if they want more
> > options.
> 
> Works for me. Looks cleaner also.
> 
> Kuyo, can you please update your patch then?
> 
ok, let me update my patch ASAP.

> Thanks,
> Juri
>