linux-kernel - Re: [PATCH v2 04/28] mm: vmscan: prepare for the refactoring the move_folios_to

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Message-ID: <aUMdCIr9-rLrQi0X@cmpxchg.org>
Date: Wed, 17 Dec 2025 16:13:44 -0500
From: Johannes Weiner <hannes@...xchg.org>
To: Qi Zheng <qi.zheng@...ux.dev>
Cc: hughd@...gle.com, mhocko@...e.com, roman.gushchin@...ux.dev,
	shakeel.butt@...ux.dev, muchun.song@...ux.dev, david@...nel.org,
	lorenzo.stoakes@...cle.com, ziy@...dia.com, harry.yoo@...cle.com,
	imran.f.khan@...cle.com, kamalesh.babulal@...cle.com,
	axelrasmussen@...gle.com, yuanchu@...gle.com, weixugc@...gle.com,
	chenridong@...weicloud.com, mkoutny@...e.com,
	akpm@...ux-foundation.org, hamzamahfooz@...ux.microsoft.com,
	apais@...ux.microsoft.com, lance.yang@...ux.dev, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Qi Zheng <zhengqi.arch@...edance.com>
Subject: Re: [PATCH v2 04/28] mm: vmscan: prepare for the refactoring the
 move_folios_to_lru()

On Wed, Dec 17, 2025 at 03:27:28PM +0800, Qi Zheng wrote:
> From: Qi Zheng <zhengqi.arch@...edance.com>
> 
> After refactoring the move_folios_to_lru(), its caller no longer needs to
> hold the lruvec lock, the disabling IRQ is only for __count_vm_events()
> and __mod_node_page_state().
> 
> On the PREEMPT_RT kernel, the local_irq_disable() cannot be used. To
> avoid using local_irq_disable() and reduce the critical section of
> disabling IRQ, make all callers of move_folios_to_lru() use IRQ-safed
> count_vm_events() and mod_node_page_state().
> 
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>