linux-kernel - Re: [PATCH RFC 06/28] mm: thp: introduce folio_split_queue

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Message-ID: <20250417145826.GI780688@cmpxchg.org>
Date: Thu, 17 Apr 2025 10:58:26 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Muchun Song <songmuchun@...edance.com>
Cc: mhocko@...nel.org, roman.gushchin@...ux.dev, shakeel.butt@...ux.dev,
	muchun.song@...ux.dev, akpm@...ux-foundation.org,
	david@...morbit.com, zhengqi.arch@...edance.com,
	yosry.ahmed@...ux.dev, nphamcs@...il.com, chengming.zhou@...ux.dev,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-mm@...ck.org, hamzamahfooz@...ux.microsoft.com,
	apais@...ux.microsoft.com
Subject: Re: [PATCH RFC 06/28] mm: thp: introduce folio_split_queue_lock and
 its variants

On Tue, Apr 15, 2025 at 10:45:10AM +0800, Muchun Song wrote:
> 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>