linux-kernel - Re: [PATCH v1 04/26] mm: vmscan: refactor move_folios_to

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Message-ID: <20251112085403.DDv0RU5k@linutronix.de>
Date: Wed, 12 Nov 2025 09:54:03 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Harry Yoo <harry.yoo@...cle.com>
Cc: Shakeel Butt <shakeel.butt@...ux.dev>, Qi Zheng <qi.zheng@...ux.dev>,
	hannes@...xchg.org, hughd@...gle.com, mhocko@...e.com,
	roman.gushchin@...ux.dev, muchun.song@...ux.dev, david@...hat.com,
	lorenzo.stoakes@...cle.com, ziy@...dia.com, imran.f.khan@...cle.com,
	kamalesh.babulal@...cle.com, axelrasmussen@...gle.com,
	yuanchu@...gle.com, weixugc@...gle.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, Muchun Song <songmuchun@...edance.com>,
	Qi Zheng <zhengqi.arch@...edance.com>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-rt-devel@...ts.linux.dev
Subject: Re: [PATCH v1 04/26] mm: vmscan: refactor move_folios_to_lru()

On 2025-11-12 17:46:51 [+0900], Harry Yoo wrote:
> > > Is PREEMPT_RT fine with this?
> > 
> > Yes.
> > The local_irq_save() is not strictly needed but I am fine with it to
> > keep it simple. The inner part is just counting.
> 
> Yeah I was wondering about this... and thanks for confirming!
The preempt_disable_nested() and no in-IRQ user makes it okay. Not the
counting, that was meant as "it is a small section". That might have
been too short of an explanation.

Sebastian