linux-kernel - Re: [PATCH v4 4/4] mm: thp: reparent the split queue during memcg offline

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Message-Id: <F929DFAE-4A4F-41CE-8FFC-A62520FFD7CC@linux.dev>
Date: Sat, 4 Oct 2025 15:52:46 +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@...hat.com,
 lorenzo.stoakes@...cle.com,
 ziy@...dia.com,
 harry.yoo@...cle.com,
 baolin.wang@...ux.alibaba.com,
 Liam.Howlett@...cle.com,
 npache@...hat.com,
 ryan.roberts@....com,
 dev.jain@....com,
 baohua@...nel.org,
 lance.yang@...ux.dev,
 akpm@...ux-foundation.org,
 linux-mm@...ck.org,
 linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org,
 Qi Zheng <zhengqi.arch@...edance.com>
Subject: Re: [PATCH v4 4/4] mm: thp: reparent the split queue during memcg
 offline



> On Oct 4, 2025, at 00:53, Qi Zheng <qi.zheng@...ux.dev> wrote:
> 
> From: Qi Zheng <zhengqi.arch@...edance.com>
> 
> Similar to list_lru, the split queue is relatively independent and does
> not need to be reparented along with objcg and LRU folios (holding
> objcg lock and lru lock). So let's apply the similar mechanism as list_lru
> to reparent the split queue separately when memcg is offine.
> 
> This is also a preparation for reparenting LRU folios.
> 
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>

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

Thanks.