linux-kernel - Re: [PATCH v1 19/26] mm: swap: prevent lruvec release in swap module

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Message-ID: <fa71b2bf-e08e-4991-a821-51c6f40e9a90@linux.dev>
Date: Thu, 20 Nov 2025 21:41:15 +0800
From: Qi Zheng <qi.zheng@...ux.dev>
To: Harry Yoo <harry.yoo@...cle.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,
 imran.f.khan@...cle.com, kamalesh.babulal@...cle.com,
 axelrasmussen@...gle.com, yuanchu@...gle.com, weixugc@...gle.com,
 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 v1 19/26] mm: swap: prevent lruvec release in swap module



On 11/20/25 5:52 PM, Harry Yoo wrote:
> On Tue, Oct 28, 2025 at 09:58:32PM +0800, Qi Zheng wrote:
>> From: Muchun Song <songmuchun@...edance.com>
>>
>> In the near future, a folio will no longer pin its corresponding
>> memory cgroup. So an lruvec returned by folio_lruvec() could be
>> released without the rcu read lock or a reference to its memory
>> cgroup.
>>
>> In the current patch, the rcu read lock is employed to safeguard
>> against the release of the lruvec in lru_note_cost_refault() and
>> lru_activate().
> 
> nit: the above paragraph looks incorrect.

Right, will fix it in the version.

> 
>> 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>

Thanks!

>