linux-kernel - Re: [RFC PATCH 00/86] Make the kernel preemptible

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Message-ID: <20231108121816.28eebfd5@gandalf.local.home>
Date:   Wed, 8 Nov 2023 12:18:16 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ankur Arora <ankur.a.arora@...cle.com>,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        paulmck@...nel.org, linux-mm@...ck.org, x86@...nel.org,
        akpm@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        willy@...radead.org, mgorman@...e.de, jon.grimm@....com,
        bharata@....com, raghavendra.kt@....com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        jgross@...e.com, andrew.cooper3@...rix.com, mingo@...nel.org,
        bristot@...nel.org, mathieu.desnoyers@...icios.com,
        geert@...ux-m68k.org, glaubitz@...sik.fu-berlin.de,
        anton.ivanov@...bridgegreys.com, mattst88@...il.com,
        krypton@...ich-teichert.org, David.Laight@...lab.com,
        richard@....at, mjguzik@...il.com
Subject: Re: [RFC PATCH 00/86] Make the kernel preemptible

On Wed, 8 Nov 2023 17:49:16 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> On Wed, Nov 08, 2023 at 11:22:27AM -0500, Steven Rostedt wrote:
> 
> > Peter, how can you say we can get rid of cond_resched() in NONE when you  
> 
> Because that would fix none to actually be none. Who cares.

Well, that would lead to regressions with PREEMPT_NONE and the watchdog
timer.

> 
> > > Look at my PoC: https://lore.kernel.org/lkml/87jzshhexi.ffs@tglx/  
> > 
> > And I've been saying that many times already ;-)  
> 
> Why should I look at random patches on the interweb to make sense of
> these patches here?

I actually said it to others, this wasn't really supposed to be addressed
to you.

> 
> That just underlines these here patches are not making sense.

It's a complex series, and there's a lot of room for improvement. I'm happy
to help out here.

-- Steve