linux-kernel - Re: [PATCH 0/4] sched: Various reweight

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Message-ID: <45678bce-3193-4d10-9655-d8014b1d0fa8@amd.com>
Date: Wed, 11 Feb 2026 01:34:31 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: Peter Zijlstra <peterz@...radead.org>
CC: Doug Smythies <dsmythies@...us.net>, <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>, <linux-kernel@...r.kernel.org>,
	<wangtao554@...wei.com>, <quzicheng@...wei.com>, <wuyun.abel@...edance.com>
Subject: Re: [PATCH 0/4] sched: Various reweight_entity() fixes

On 2/11/2026 12:05 AM, Peter Zijlstra wrote:
> On Tue, Feb 10, 2026 at 11:39:14PM +0530, K Prateek Nayak wrote:
> 
> 
>> Since you mentioned there is some bound to the number of copies when
>> the hang is observed, can you please share your system details and
>> the number of CPUs it has?
> 
> He had that information in another email, 6 cores/12 threads.

Ah! My bad. should have dug deeper.

> 
> For me, I got to 21160 spread over 12 threads when it went boom. That
> translates to aroun 1763 per CPU. Which is a fairly silly number of
> active tasks, but it *should* work.
> 
> It's a bit tedious to reproduce, but I'll prod at it some too.

My machine hasn't cracked yet with 30k instances. I'll too will prod
more tomorrow.

-- 
Thanks and Regards,
Prateek