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

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Message-ID: <20250305140305.GA51446@pauld.westford.csb>
Date: Wed, 5 Mar 2025 09:03:05 -0500
From: Phil Auld <pauld@...hat.com>
To: Valentin Schneider <vschneid@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, 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>,
	Petr Tesarik <ptesarik@...e.com>,
	Jinjie Ruan <ruanjinjie@...wei.com>,
	Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH 0/1] arm64: enable PREEMPT_LAZY

On Wed, Mar 05, 2025 at 11:49:24AM +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  
> 
> [1]: https://lore.kernel.org/linux-rt-users/Z2B5y3HiLuRHPfdv@J2N7QTR9R3.cambridge.arm.com/
>

Thanks!  I was looking for this the other day :) 


Cheers,
Phil

> Cheers,
> Valentin
> 
> Mark Rutland (1):
>   arm64: enable PREEMPT_LAZY
> 
>  arch/arm64/Kconfig                   |  1 +
>  arch/arm64/include/asm/thread_info.h | 16 +++++++++-------
>  arch/arm64/kernel/entry-common.c     |  2 +-
>  3 files changed, 11 insertions(+), 8 deletions(-)
> 
> --
> 2.43.0
> 

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