linux-kernel - Re: [RFC][PATCH 0/3] sched/ext: Cleanup pick_task

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Message-ID: <7d13109d-28e6-46fa-898c-388fc9912710@arm.com>
Date: Tue, 7 Oct 2025 13:40:22 +0100
From: Christian Loehle <christian.loehle@....com>
To: Peter Zijlstra <peterz@...radead.org>, tj@...nel.org
Cc: linux-kernel@...r.kernel.org, mingo@...nel.org, juri.lelli@...hat.com,
 vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org,
 bsegall@...gle.com, mgorman@...e.de, vschneid@...hat.com,
 longman@...hat.com, hannes@...xchg.org, mkoutny@...e.com,
 void@...ifault.com, arighi@...dia.com, changwoo@...lia.com,
 cgroups@...r.kernel.org, sched-ext@...ts.linux.dev, liuwenfang@...or.com,
 tglx@...utronix.de
Subject: Re: [RFC][PATCH 0/3] sched/ext: Cleanup pick_task_scx()

On 10/6/25 11:46, Peter Zijlstra wrote:
> Hi,
> 
> So I had a poke at 'give @rf to pick_task() and fold balance_scx() into
> pick_task_scx()' option to see how terrible it was. Turns out, not terrible at
> all.
> 
> I've ran the sched_ext selftest and stress-ng --race-sched 0 thing with various
> scx_* thingies on.
> 
> These patches were done on top of the 'sched_change' patches posted just now:
> 
>   https://lkml.kernel.org/r/20251006104402.946760805@infradead.org
> 
> The combined set is also available here:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/cleanup-pick
> 

FWIW I didn't run into any issues either running some scx scheduler + workload
combinations.