linux-kernel - Re: [PATCH v4 25/31] mm: vmscan: prepare for reparenting traditional LRU folios

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Message-ID: <aYaVIzw6cVUO72A5@linux.dev>
Date: Fri, 6 Feb 2026 17:28:26 -0800
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Qi Zheng <qi.zheng@...ux.dev>
Cc: hannes@...xchg.org, hughd@...gle.com, mhocko@...e.com, 
	roman.gushchin@...ux.dev, muchun.song@...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, bhe@...hat.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	cgroups@...r.kernel.org, Qi Zheng <zhengqi.arch@...edance.com>
Subject: Re: [PATCH v4 25/31] mm: vmscan: prepare for reparenting traditional
 LRU folios

On Thu, Feb 05, 2026 at 05:01:44PM +0800, Qi Zheng wrote:
> From: Qi Zheng <zhengqi.arch@...edance.com>
> 
> To resolve the dying memcg issue, we need to reparent LRU folios of child
> memcg to its parent memcg. For traditional LRU list, each lruvec of every
> memcg comprises four LRU lists. Due to the symmetry of the LRU lists, it
> is feasible to transfer the LRU lists from a memcg to its parent memcg
> during the reparenting process.
> 
> This commit implements the specific function, which will be used during
> the reparenting process.
> 
> 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: Muchun Song <muchun.song@...ux.dev>

Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>