linux-kernel - Re: [GIT PULL] Scheduler updates for v6.17

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Message-ID: <20250804125028.0676d201@gandalf.local.home>
Date: Mon, 4 Aug 2025 12:50:28 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org, Peter
 Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Juri
 Lelli <juri.lelli@...hat.com>, Vincent Guittot
 <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>,
 Mel Gorman <mgorman@...e.de>, Tejun Heo <tj@...nel.org>, Valentin Schneider
 <vschneid@...hat.com>, Shrikanth Hegde <sshegde@...ux.ibm.com>, Johannes
 Weiner <hannes@...xchg.org>, Chris Bainbridge <chris.bainbridge@...il.com>
Subject: Re: [GIT PULL] Scheduler updates for v6.17

On Wed, 30 Jul 2025 20:31:44 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Sun, 27 Jul 2025 at 23:48, Ingo Molnar <mingo@...nel.org> wrote:
> >
> > PSI:
> >
> >  - Improve scalability by optimizing psi_group_change() cpu_clock() usage
> >    (Peter Zijlstra)  
> 
> I suspect this is buggy.
> 

I forgot about this change, thinking it was added, until I saw this email:

  https://lore.kernel.org/all/20250804133240.GA1303466@cmpxchg.org/

It appears that Peter never sent in the change of:

  https://lore.kernel.org/lkml/20250716104050.GR1613200@noisy.programming.kicks-ass.net/

Looks like this could be your issue.

-- Steve