linux-kernel - Re: [PATCH v5 8/8] mm: huge_memory: enable debugfs to split huge pages to any order.

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Message-ID: <A111EB95-0AF5-4715-82A4-70B8AD900A93@nvidia.com>
Date: Fri, 01 Mar 2024 14:37:22 -0500
From: Zi Yan <ziy@...dia.com>
To: Aishwarya TCV <aishwarya.tcv@....com>
Cc: "\"Pankaj Raghav (Samsung)\"" <kernel@...kajraghav.com>,
 linux-mm@...ck.org, "\"Matthew Wilcox (Oracle)\"" <willy@...radead.org>,
 David Hildenbrand <david@...hat.com>, Yang Shi <shy828301@...il.com>,
 Yu Zhao <yuzhao@...gle.com>,
 "\"Kirill A . Shutemov\"" <kirill.shutemov@...ux.intel.com>,
 Ryan Roberts <ryan.roberts@....com>,
 "Michal Koutný" <mkoutny@...e.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 "\"Zach O'Keefe\"" <zokeefe@...gle.com>, Hugh Dickins <hughd@...gle.com>,
 Luis Chamberlain <mcgrof@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v5 8/8] mm: huge_memory: enable debugfs to split huge
 pages to any order.

On 1 Mar 2024, at 4:51, Aishwarya TCV wrote:

> On 26/02/2024 20:55, Zi Yan wrote:
>> From: Zi Yan <ziy@...dia.com>
>>
>> It is used to test split_huge_page_to_list_to_order for pagecache THPs.
>> Also add test cases for split_huge_page_to_list_to_order via both
>> debugfs.
>>
>> Signed-off-by: Zi Yan <ziy@...dia.com>
>> ---
>>  mm/huge_memory.c                              |  34 ++++--
>>  .../selftests/mm/split_huge_page_test.c       | 115 +++++++++++++++++-
>>  2 files changed, 131 insertions(+), 18 deletions(-)
>>
>
> Hi Zi,
>
> When booting the kernel against next-master(20240228)with Arm64 on
> Marvell Thunder X2 (TX2), the kselftest-mm test 'split_huge_page_test'
> is failing in our CI (with rootfs over NFS). I can send the full logs if
> required.
>
> A bisect (full log below) identified this patch as introducing the
> failure. Bisected it on the tag "next-20240228" at repo
> "https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git".
>
> This works fine on  Linux version 6.8.0-rc6

Hi Aishwarya,

Can you try the attached patch and see if it fixes the failure? I changed
the test to accept XFS dev as input, mount XFS on a temp folder under /tmp,
and skip if no XFS is mounted.

Thanks.

--
Best Regards,
Yan, Zi

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