linux-kernel - Re: [PATCH] khugepaged: Optimize __collapse_huge_page_copy_succeeded() for large folios by PTE batching

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Message-ID: <eff48e22-0323-46d1-bb9d-70f2c534f758@lucifer.local>
Date: Thu, 19 Jun 2025 13:52:41 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: Dev Jain <dev.jain@....com>, akpm@...ux-foundation.org, ziy@...dia.com,
        baolin.wang@...ux.alibaba.com, Liam.Howlett@...cle.com,
        npache@...hat.com, ryan.roberts@....com, baohua@...nel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] khugepaged: Optimize
 __collapse_huge_page_copy_succeeded() for large folios by PTE batching

On Wed, Jun 18, 2025 at 07:29:42PM +0200, David Hildenbrand wrote:
> On 18.06.25 19:26, Lorenzo Stoakes wrote:
> > Where does a large folio get unlocked?
>
> Through the "compound_pagelist" below. ... this code is so ugly.
>
> "large_folio_list" ...
>

Yeah I did wonder if that was what it was... yuck indeed!