linux-kernel - Re: [PATCH 17/24] sched/fair: Implement delayed dequeue

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Message-ID: <20241107140945.GA34695@noisy.programming.kicks-ass.net>
Date: Thu, 7 Nov 2024 15:09:45 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Mike Galbraith <efault@....de>
Cc: Phil Auld <pauld@...hat.com>, mingo@...hat.com, juri.lelli@...hat.com,
	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
	vschneid@...hat.com, linux-kernel@...r.kernel.org,
	kprateek.nayak@....com, wuyun.abel@...edance.com,
	youssefesmat@...omium.org, tglx@...utronix.de
Subject: Re: [PATCH 17/24] sched/fair: Implement delayed dequeue

On Thu, Nov 07, 2024 at 03:02:36PM +0100, Mike Galbraith wrote:
> On Thu, 2024-11-07 at 10:46 +0100, Mike Galbraith wrote:
> > On Thu, 2024-11-07 at 05:03 +0100, Mike Galbraith wrote:
> > >
> > > I built that patch out of curiosity, and yeah, set_next_task_fair()
> > > finding a cfs_rq->curr ends play time pretty quickly.
> >
> > The below improved uptime, and trace_printk() says it's doing the
> > intended, so I suppose I'll add a feature and see what falls out.
> 
> From netperf, I got.. number tabulation practice.  Three runs of each
> test with and without produced nothing but variance/noise.

Make it go away then.

If you could write a Changelog for you inspired bit and stick my cleaned
up version under it, I'd be much obliged.