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

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Date: Wed, 5 Jun 2024 19:45:16 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Ankur Arora <ankur.a.arora@...cle.com>, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, 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 Wed, Jun 05, 2024 at 08:44:50AM -0700, Sean Christopherson wrote:
> 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.

It so happens I've queued them for sched/core earlier today (see
queue/sched/core). If the robot comes back happy, I'll push them into
tip.

Thanks!