linux-kernel - Re: [PATCH 3/3] sched_ext: Allow scx_bpf_reenqueue

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Message-ID: <aP-0dkIQa7iwHv5e@slm.duckdns.org>
Date: Mon, 27 Oct 2025 08:05:42 -1000
From: Tejun Heo <tj@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: David Vernet <void@...ifault.com>,
	Andrea Righi <andrea.righi@...ux.dev>,
	Changwoo Min <changwoo@...lia.com>, linux-kernel@...r.kernel.org,
	sched-ext@...ts.linux.dev, Wen-Fang Liu <liuwenfang@...or.com>
Subject: Re: [PATCH 3/3] sched_ext: Allow scx_bpf_reenqueue_local() to be
 called from anywhere

On Mon, Oct 27, 2025 at 06:49:53PM +0100, Peter Zijlstra wrote:
> > That's what I thought too and the gap between balance() and pick_task() can
> > be closed that way. However, while plugging that, I realized there's another
> > bigger gap between ttwu() and pick_task() because ttwu() can directly
> > dispatch a task into the local DSQ of a CPU. That one, there's no way to
> > close without a global hook.
> 
> This would've been prime Changelog material. As is the Changelog was so
> vague I wasn't even sure it was that particular problem.
> 
> Please update the changelog to be clearer.

Oh yeah, good point.

> Also, why is this patch already in a pull request to Linus? what's the
> hurry.

Hmmm? It shouldn't be. Let me check again. No, it isn't. What are you
looking at?

Thanks.

-- 
tejun