linux-kernel - Re: [PATCH v3 17/30] mm: thp: prevent memory cgroup release in folio_split_queue_lock{

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Message-Id: <394C2721-72AF-44AE-9953-C7C6DCFC8038@linux.dev>
Date: Fri, 16 Jan 2026 17:15:36 +0800
From: Muchun Song <muchun.song@...ux.dev>
To: Qi Zheng <qi.zheng@...ux.dev>
Cc: hannes@...xchg.org,
 hughd@...gle.com,
 mhocko@...e.com,
 roman.gushchin@...ux.dev,
 shakeel.butt@...ux.dev,
 david@...nel.org,
 lorenzo.stoakes@...cle.com,
 ziy@...dia.com,
 harry.yoo@...cle.com,
 yosry.ahmed@...ux.dev,
 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 v3 17/30] mm: thp: prevent memory cgroup release in
 folio_split_queue_lock{_irqsave}()



> On Jan 14, 2026, at 19:32, Qi Zheng <qi.zheng@...ux.dev> wrote:
> 
> From: Qi Zheng <zhengqi.arch@...edance.com>
> 
> In the near future, a folio will no longer pin its corresponding memory
> cgroup. To ensure safety, it will only be appropriate to hold the rcu read
> lock or acquire a reference to the memory cgroup returned by
> folio_memcg(), thereby preventing it from being released.
> 
> In the current patch, the rcu read lock is employed to safeguard against
> the release of the memory cgroup in folio_split_queue_lock{_irqsave}().
> 
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> Reviewed-by: Harry Yoo <harry.yoo@...cle.com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>
> Acked-by: David Hildenbrand (Red Hat) <david@...nel.org>

Acked-by: Muchun Song <muchun.song@...ux.dev>