linux-kernel - Re: [PATCH v3 2/4] mm: thp: introduce folio_split_queue

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Message-ID: <aN3Y8j8yAfO1F5gZ@hyeyoo>
Date: Thu, 2 Oct 2025 10:44:18 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: Qi Zheng <zhengqi.arch@...edance.com>
Cc: hannes@...xchg.org, hughd@...gle.com, mhocko@...e.com,
        roman.gushchin@...ux.dev, shakeel.butt@...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 v3 2/4] mm: thp: introduce folio_split_queue_lock and its
 variants

On Sun, Sep 28, 2025 at 07:17:00PM +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>
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> Reviewed-by: Zi Yan <ziy@...dia.com>
> Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>
> Acked-by: David Hildenbrand <david@...hat.com>
> ---

Looks good to me,
Reviewed-by: Harry Yoo <harry.yoo@...cle.com>

-- 
Cheers,
Harry / Hyeonggon