Re: [PATCH v2 09/28] buffer: prevent memory cgroup release in folio_alloc_buffers()

[Chen Ridong]

On 2025/12/19 10:14, Shakeel Butt wrote:
> On Wed, Dec 17, 2025 at 03:27:33PM +0800, Qi Zheng wrote:
>> From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
>>
>> 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 function get_mem_cgroup_from_folio() is
>> employed to safeguard against the release of the memory cgroup.
>> This serves as a preparatory measure for the reparenting of the
>> LRU pages.
>>
>> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
>> Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
>> Reviewed-by: Harry Yoo <harry.yoo@xxxxxxxxxx>
> 
> Acked-by: Shakeel Butt <shakeel.butt@xxxxxxxxx>

Reviewed-by: Chen Ridong <chenridong@xxxxxxxxxx>

-- 
Best regards,
Ridong