linux-kernel - Re: [PATCH 2/4] mm: thp: introduce folio_split_queue

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Message-ID: <v7xskholk2cdoofuv247lbk3l643jovxqheuq7hu32wj2ncz64@irs7qwsbaiqz>
Date: Fri, 19 Sep 2025 17:49:48 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Qi Zheng <zhengqi.arch@...edance.com>
Cc: 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, baolin.wang@...ux.alibaba.com, 
	Liam.Howlett@...cle.com, npache@...hat.com, ryan.roberts@....com, dev.jain@....com, 
	baohua@...nel.org, lance.yang@...ux.dev, akpm@...ux-foundation.org, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, 
	Muchun Song <songmuchun@...edance.com>
Subject: Re: [PATCH 2/4] mm: thp: introduce folio_split_queue_lock and its
 variants

On Fri, Sep 19, 2025 at 11:46:33AM +0800, Qi Zheng wrote:
> From: Muchun Song <songmuchun@...edance.com>
> 
> In future memcg removal, the binding between a folio and a memcg may
> change, making the split lock within the memcg unstable when held.
> 
> A new approach is required to reparent the split queue to its parent. This
> patch starts introducing a unified way to acquire the split lock for
> future work.
> 
> It's a code-only refactoring with no functional changes.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>

Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>