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: <2ED5C25C-FDB2-490F-B740-E413E8186C12@nvidia.com>
Date: Fri, 01 Mar 2024 09:00:33 -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,

I am trying to fix the issue. When I am compiling selftests/mm, I encountered
the error below when I run make under the folder. Am I missing any configuration?
Since you are able to run the test, I assume you know what is happening. Thanks.

vm_util.c: In function ‘__pagemap_scan_get_categories’:
vm_util.c:34:28: error: storage size of ‘arg’ isn’t known
   34 |         struct pm_scan_arg arg;
      |                            ^~~
vm_util.c:41:27: error: invalid application of ‘sizeof’ to incomplete type ‘struct pm_scan_arg’
   41 |         arg.size = sizeof(struct pm_scan_arg);
      |                           ^~~~~~
vm_util.c:45:35: error: ‘PAGE_IS_WPALLOWED’ undeclared (first use in this function)
   45 |         arg.category_anyof_mask = PAGE_IS_WPALLOWED | PAGE_IS_WRITTEN | PAGE_IS_FILE |
      |                                   ^~~~~~~~~~~~~~~~~
vm_util.c:45:35: note: each undeclared identifier is reported only once for each function it appears in
vm_util.c:45:55: error: ‘PAGE_IS_WRITTEN’ undeclared (first use in this function)
   45 |         arg.category_anyof_mask = PAGE_IS_WPALLOWED | PAGE_IS_WRITTEN | PAGE_IS_FILE |
      |                                                       ^~~~~~~~~~~~~~~
vm_util.c:45:73: error: ‘PAGE_IS_FILE’ undeclared (first use in this function)
   45 |         arg.category_anyof_mask = PAGE_IS_WPALLOWED | PAGE_IS_WRITTEN | PAGE_IS_FILE |
      |                                                                         ^~~~~~~~~~~~
vm_util.c:46:35: error: ‘PAGE_IS_PRESENT’ undeclared (first use in this function); did you mean ‘PAGEMAP_PRESENT’?
   46 |                                   PAGE_IS_PRESENT | PAGE_IS_SWAPPED | PAGE_IS_PFNZERO |
      |                                   ^~~~~~~~~~~~~~~
      |                                   PAGEMAP_PRESENT
vm_util.c:46:53: error: ‘PAGE_IS_SWAPPED’ undeclared (first use in this function)
   46 |                                   PAGE_IS_PRESENT | PAGE_IS_SWAPPED | PAGE_IS_PFNZERO |
      |                                                     ^~~~~~~~~~~~~~~
vm_util.c:46:71: error: ‘PAGE_IS_PFNZERO’ undeclared (first use in this function)
   46 |                                   PAGE_IS_PRESENT | PAGE_IS_SWAPPED | PAGE_IS_PFNZERO |
      |                                                                       ^~~~~~~~~~~~~~~
vm_util.c:47:35: error: ‘PAGE_IS_HUGE’ undeclared (first use in this function)
   47 |                                   PAGE_IS_HUGE | PAGE_IS_SOFT_DIRTY;
      |                                   ^~~~~~~~~~~~
vm_util.c:47:50: error: ‘PAGE_IS_SOFT_DIRTY’ undeclared (first use in this function); did you mean ‘PM_SOFT_DIRTY’?
   47 |                                   PAGE_IS_HUGE | PAGE_IS_SOFT_DIRTY;
      |                                                  ^~~~~~~~~~~~~~~~~~
      |                                                  PM_SOFT_DIRTY
vm_util.c:50:26: error: ‘PAGEMAP_SCAN’ undeclared (first use in this function); did you mean ‘PAGEMAP_PFN’?
   50 |         return ioctl(fd, PAGEMAP_SCAN, &arg);
      |                          ^~~~~~~~~~~~
      |                          PAGEMAP_PFN

--
Best Regards,
Yan, Zi

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