linux-kernel - Re: [RFC PATCH 2/7] sched/fair: Handle throttle path for task based throttle

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Message-ID: <CABk29Nv0Rh4L7h+XEjWwcMixSqtaCBh9U-Ajm4eKaYwvsRsjLw@mail.gmail.com>
Date: Wed, 19 Mar 2025 18:06:39 -0700
From: Josh Don <joshdon@...gle.com>
To: Aaron Lu <ziqianlu@...edance.com>, Chengming Zhou <chengming.zhou@...ux.dev>, 
	Xi Wang <xii@...gle.com>
Cc: Valentin Schneider <vschneid@...hat.com>, Ben Segall <bsegall@...gle.com>, 
	K Prateek Nayak <kprateek.nayak@....com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, 
	linux-kernel@...r.kernel.org, Juri Lelli <juri.lelli@...hat.com>, 
	Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>, 
	Mel Gorman <mgorman@...e.de>, Chuyi Zhou <zhouchuyi@...edance.com>
Subject: Re: [RFC PATCH 2/7] sched/fair: Handle throttle path for task based throttle

On Wed, Mar 19, 2025 at 6:43 AM Aaron Lu <ziqianlu@...edance.com> wrote:
[snip]
> > track of the number of threads within a cgroup hierarchy currently in
> > kernel mode (similar to h_nr_runnable), and thus simplify down the
> > throttling code here.
>
> My initial feeling is the implementation looks pretty complex. If it can
> be simplified somehow, that would be great.

Xi (attached to this message) spoke about this at LPC last year; Xi
can you describe your approach in a little bit more concrete detail?

Best,
Josh