linux-kernel - Re: [PATCH v2 00/35] PREEMPT_AUTO: support lazy rescheduling

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Message-ID: <ZmCH8vH6VRdYHZWs@google.com>
Date: Wed, 5 Jun 2024 08:44:50 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Ankur Arora <ankur.a.arora@...cle.com>
Cc: linux-kernel@...r.kernel.org, tglx@...utronix.de, peterz@...radead.org, 
	torvalds@...ux-foundation.org, paulmck@...nel.org, rostedt@...dmis.org, 
	mark.rutland@....com, juri.lelli@...hat.com, joel@...lfernandes.org, 
	raghavendra.kt@....com, sshegde@...ux.ibm.com, boris.ostrovsky@...cle.com, 
	konrad.wilk@...cle.com
Subject: Re: [PATCH v2 00/35] PREEMPT_AUTO: support lazy rescheduling

On Mon, May 27, 2024, Ankur Arora wrote:
> Patches 1,2 
>  "sched/core: Move preempt_model_*() helpers from sched.h to preempt.h"
>  "sched/core: Drop spinlocks on contention iff kernel is preemptible"
> condition spin_needbreak() on the dynamic preempt_model_*().

...

> Not really required but a useful bugfix for PREEMPT_DYNAMIC and PREEMPT_AUTO.
> Sean Christopherson (2):
>   sched/core: Move preempt_model_*() helpers from sched.h to preempt.h
>   sched/core: Drop spinlocks on contention iff kernel is preemptible

Peter and/or Thomas, would it be possible to get these applied to tip-tree sooner
than later?  They fix a real bug that affects KVM to varying degrees.