linux-kernel - Re: scheduler problems in -next (was: Re: [PATCH 6.4 000/227] 6.4.7-rc1 review)

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Message-ID: <20230731211517.GA51835@hirez.programming.kicks-ass.net>
Date:   Mon, 31 Jul 2023 23:15:17 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Roy Hopkins <rhopkins@...e.de>,
        Joel Fernandes <joel@...lfernandes.org>, paulmck@...nel.org,
        Pavel Machek <pavel@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, patches@...ts.linux.dev,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, shuah@...nel.org, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, jonathanh@...dia.com,
        f.fainelli@...il.com, sudipm.mukherjee@...il.com,
        srw@...dewatkins.net, rwarsow@....de, conor@...nel.org,
        rcu@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: scheduler problems in -next (was: Re: [PATCH 6.4 000/227]
 6.4.7-rc1 review)

On Mon, Jul 31, 2023 at 09:34:29AM -0700, Guenter Roeck wrote:
> > Ha!, I was poking around the same thing. My hack below seems to (so far,
> > <20 boots) help things.
> > 
> 
> So, dumb question:
> How comes this bisects to "sched/fair: Remove sched_feat(START_DEBIT)" ?

That commit changes the timings of things; dumb luck otherwise.