linux-kernel - Re: [RFC 01/12] mm: add PUD THP ptdesc and rmap support

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Message-ID: <aYQZzw8kJFsy1mMW@casper.infradead.org>
Date: Thu, 5 Feb 2026 04:17:19 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Usama Arif <usamaarif642@...il.com>
Cc: Zi Yan <ziy@...dia.com>, Kiryl Shutsemau <kas@...nel.org>,
	lorenzo.stoakes@...cle.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>, linux-mm@...ck.org,
	hannes@...xchg.org, riel@...riel.com, shakeel.butt@...ux.dev,
	baohua@...nel.org, dev.jain@....com, baolin.wang@...ux.alibaba.com,
	npache@...hat.com, Liam.Howlett@...cle.com, ryan.roberts@....com,
	vbabka@...e.cz, lance.yang@...ux.dev, linux-kernel@...r.kernel.org,
	kernel-team@...a.com
Subject: Re: [RFC 01/12] mm: add PUD THP ptdesc and rmap support

On Tue, Feb 03, 2026 at 02:07:25PM -0800, Usama Arif wrote:
> Ah I should have looked at your patches more! I started working by just using lru
> and was using list_add/list_del which was ofcourse corrupting the list and took me
> way more time than I would like to admit to debug what was going on! The diagrams
> in your 2nd link are really useful. I ended up drawing by hand those to debug
> the corruption issue. I will point to that link in the next series :) 
> 
> How about something like the below diff over this patch? (Not included the comment
> changes that I will make everywhere)

Why are you even talking about "the next series"?  The approach is
wrong.  You need to put this POC aside and solve the problems that
you've bypassed to create this POC.