linux-kernel - Re: [PATCH 0/1] arm64: enable PREEMPT

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Message-ID: <20250430103813.5bea9f4a@mordecai>
Date: Wed, 30 Apr 2025 10:38:13 +0200
From: Petr Tesarik <ptesarik@...e.com>
To: Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-rt-users@...r.kernel.org, Valentin Schneider <vschneid@...hat.com>,
 catalin.marinas@....com, kernel-team@...roid.com, Mike Galbraith
 <efault@....de>, Peter Collingbourne <pcc@...gle.com>, Mark Rutland
 <mark.rutland@....com>, Thomas Gleixner <tglx@...utronix.de>, Neeraj
 Upadhyay <neeraj.upadhyay@...nel.org>, Thiago Jung Bauermann
 <thiago.bauermann@...aro.org>, Mark Brown <broonie@...nel.org>, Kristina
 Martsenko <kristina.martsenko@....com>, Sebastian Andrzej Siewior
 <bigeasy@...utronix.de>, Jinjie Ruan <ruanjinjie@...wei.com>, Juri Lelli
 <juri.lelli@...hat.com>, Phil Auld <pauld@...hat.com>
Subject: Re: [PATCH 0/1] arm64: enable PREEMPT_LAZY

On Tue, 29 Apr 2025 21:27:52 +0100
Will Deacon <will@...nel.org> wrote:

> On Wed, 05 Mar 2025 11:49:24 +0100, Valentin Schneider wrote:
> > Hey folks,
> > 
> > This is a resubmission of Mark's patch [1]. I didn't end up changing anything
> > other than fluffing up the changelog.
> > 
> > I ran this under an arm64 VM, added some trace_printk's and checked that
> > sched_switch's between runnable hackbench threads would occurr in the right
> > conditions:
> > o with TIF_NEED_RESCHED_LAZY set
> >   o at the tick
> >   o at do_notify_resume()
> > o with TIF_NEED_RESCHED set
> > 
> > [...]  
> 
> Applied to arm64 (for-next/entry), thanks!
> 
> [1/1] arm64: enable PREEMPT_LAZY
>       https://git.kernel.org/arm64/c/c8597e2dd8b6

Great news. Thank you!

Petr T