linux-kernel - Re: [PATCH 26/30] sched: handle preempt=voluntary under PREEMPT

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Message-ID: <d8b67a49-611c-4631-b54f-f20f8146d40f@paulmck-laptop>
Date: Tue, 12 Mar 2024 12:40:05 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
	Ankur Arora <ankur.a.arora@...cle.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	linux-kernel@...r.kernel.org, peterz@...radead.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, jpoimboe@...nel.org,
	mark.rutland@....com, jgross@...e.com, andrew.cooper3@...rix.com,
	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, rostedt@...dmis.org,
	David.Laight@...lab.com, richard@....at, mjguzik@...il.com,
	jon.grimm@....com, bharata@....com, raghavendra.kt@....com,
	boris.ostrovsky@...cle.com, konrad.wilk@...cle.com
Subject: Re: [PATCH 26/30] sched: handle preempt=voluntary under PREEMPT_AUTO

On Tue, Mar 12, 2024 at 01:14:37PM +0100, Thomas Gleixner wrote:
> On Mon, Mar 11 2024 at 17:03, Paul E. McKenney wrote:
> > On Mon, Mar 11, 2024 at 01:23:09PM -0700, Linus Torvalds wrote:
> >> Because any potential future case is *not* going to be the same
> >> cond_resched() that the current case is anyway. It is going to have
> >> some very different cause.
> >
> > Fair enough, and that approach just means that we will be reaching out
> > to Ankur and Thomas sooner rather than later if something goes sideways
> > latency-wise.  ;-)
> 
> You can't make an omelette without breaking eggs.

Precisely!  ;-)

							Thanx, Paul