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

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Message-ID: <20250305104925.189198-1-vschneid@redhat.com>
Date: Wed,  5 Mar 2025 11:49:24 +0100
From: Valentin Schneider <vschneid@...hat.com>
To: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org
Cc: 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>,
	Phil Auld <pauld@...hat.com>
Subject: [PATCH 0/1] arm64: enable PREEMPT_LAZY

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/

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