linux-kernel - Re: [PATCH v3] mm/vmscan: fix demotion targets checks in reclaim/demotion

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Message-ID: <aUsLv7LAgqGlhTjW@google.com>
Date: Tue, 23 Dec 2025 21:38:07 +0000
From: Bing Jiao <bingjiao@...gle.com>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	gourry@...rry.net, longman@...hat.com, hannes@...xchg.org,
	mhocko@...nel.org, roman.gushchin@...ux.dev, shakeel.butt@...ux.dev,
	muchun.song@...ux.dev, tj@...nel.org, mkoutny@...e.com,
	david@...nel.org, zhengqi.arch@...edance.com,
	lorenzo.stoakes@...cle.com, axelrasmussen@...gle.com,
	chenridong@...weicloud.com, yuanchu@...gle.com, weixugc@...gle.com,
	cgroups@...r.kernel.org
Subject: Re: [PATCH v3] mm/vmscan: fix demotion targets checks in
 reclaim/demotion

On Tue, Dec 23, 2025 at 09:19:59PM +0000, Bing Jiao wrote:
> Fix two bugs in demote_folio_list() and can_demote() due to incorrect
> demotion target checks in reclaim/demotion.
>

Considering these bugs are introduced from one commit, I think
it is better to fix it in one patch rather than split it.

v3: Rename cpuset_node_allowed() as cpuset_node_get_allowed() to
    return effective_mems directly, providing better versatility
    (thanks Ridong for the suggestion).