linux-kernel - Re: [PATCH v3 14/30] mm: mglru: prevent memory cgroup release in mglru

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Message-ID: <aW34oXeXcyqrShXF@hyeyoo>
Date: Mon, 19 Jan 2026 18:25:53 +0900
From: Harry Yoo <harry.yoo@...cle.com>
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,
        muchun.song@...ux.dev, david@...nel.org, lorenzo.stoakes@...cle.com,
        ziy@...dia.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, Muchun Song <songmuchun@...edance.com>,
        Qi Zheng <zhengqi.arch@...edance.com>
Subject: Re: [PATCH v3 14/30] mm: mglru: prevent memory cgroup release in
 mglru

On Wed, Jan 14, 2026 at 07:32:41PM +0800, Qi Zheng wrote:
> From: Muchun Song <songmuchun@...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 mglru.
>
> This serves as a preparatory measure for the reparenting of the
> LRU pages.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> ---

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

-- 
Cheers,
Harry / Hyeonggon