linux-kernel - Re: [patch v1A 2/2] sched/ext: Remove sched

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Message-ID: <Zx_L6uCS9vvQTsna@slm.duckdns.org>
Date: Mon, 28 Oct 2024 07:37:46 -1000
From: Tejun Heo <tj@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	David Vernet <void@...ifault.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Ingo Molnar <mingo@...nel.org>, Rasmus Villemoes <ravi@...vas.dk>
Subject: Re: [patch v1A 2/2] sched/ext: Remove sched_fork() hack

On Mon, Oct 28, 2024 at 02:20:35PM +0100, Thomas Gleixner wrote:
> Instead of solving the underlying problem of the double invocation of
> __sched_fork() for idle tasks, sched-ext decided to hack around the issue
> by partially clearing out the entity struct to preserve the already
> enqueued node. A provided analysis and solution has been ignored for four
> months.
> 
> Now that someone else has taken care of cleaning it up, remove the
> disgusting hack and clear out the full structure. Remove the comment in the
> structure declaration as well, as there is no requirement for @node being
> the last element anymore.
> 
> Fixes: f0e1a0643a59 ("sched_ext: Implement BPF extensible scheduler class")
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: David Vernet <void@...ifault.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Vincent Guittot <vincent.guittot@...aro.org>
> Cc: Dietmar Eggemann <dietmar.eggemann@....com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ben Segall <bsegall@...gle.com>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Valentin Schneider <vschneid@...hat.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun