linux-kernel - Re: [PATCH v5 4/5] selftests/mm: add check_after_split_folio

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Message-ID: <a81b7fd3-c466-45c9-9374-361b780ce09b@linux.alibaba.com>
Date: Wed, 20 Aug 2025 17:22:30 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: Zi Yan <ziy@...dia.com>, Wei Yang <richard.weiyang@...il.com>,
 wang lian <lianux.mm@...il.com>, David Hildenbrand <david@...hat.com>,
 linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Nico Pache <npache@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
 Barry Song <baohua@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
 Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>,
 Michal Hocko <mhocko@...e.com>, Shuah Khan <shuah@...nel.org>,
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v5 4/5] selftests/mm: add check_after_split_folio_orders()
 helper.

On 2025/8/19 02:46, Zi Yan wrote:
> The helper gathers a folio order statistics of folios within a virtual
> address range and checks it against a given order list. It aims to provide
> a more precise folio order check instead of just checking the existence of
> PMD folios.
> 
> The helper will be used the upcoming commit.
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>
> ---

I tested this patch, and it works for me.
Tested-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

By the way, I moved gather_after_split_folio_orders() to the vm_util.c 
file as a helper for mTHP collapse checks in my patchset[1]. I'm not 
sure whether you need to move gather_after_split_folio_orders() to 
vm_util.c in this patch, or if I should move it in my patchset.

[1] 
https://lore.kernel.org/all/955e0b9682b1746c528a043f0ca530b54ee22536.1755677674.git.baolin.wang@linux.alibaba.com/