linux-kernel - Re: [RFC PATCH] sched/deadline: Avoid dl_server boosting with expired deadline

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Message-ID: <aO8zwouX6qIaf-U-@jlelli-thinkpadt14gen4.remote.csb>
Date: Wed, 15 Oct 2025 07:40:18 +0200
From: Juri Lelli <juri.lelli@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Gabriele Monaco <gmonaco@...hat.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Clark Williams <williams@...hat.com>
Subject: Re: [RFC PATCH] sched/deadline: Avoid dl_server boosting with
 expired deadline

On 14/10/25 21:33, Peter Zijlstra wrote:
> On Tue, Oct 14, 2025 at 06:01:10PM +0200, Juri Lelli wrote:
> 
> > Shouldn't idle time be accounted (subtracted from runtime) as well, though?
> 
> Argh, indeed. Then I suppose we should look at bringing some of that
> 'idle-for-whole-period' logic to try and actually stop the timer at some
> point if nothing happens.

That was my initial thought. If we get to that replenish after a whole
idle period elapsed, stop the timer (resetting state), so that we can go
back at defer mode with the next enqueue from fair.