Re: [PATCH v3 2/2] selftests/mm: load xfs before checking for it in run_vmtests.sh

[Zi Yan <ziy@nvidia.com>]

On 29 Oct 2026, at 2:24, Qiliang Yuan wrote:

> run_vmtests.sh creates a loop-mounted XFS for "khugepaged all:file" and
> for the pagecache folio split cases of split_huge_page_test, since
> tmpfs does not give them large pagecache folios.
>
> It only does so when xfs already shows up in /proc/filesystems. When
> xfs is built as a module that is not loaded yet, the check fails, no
> XFS is created, "khugepaged all:file" is reported as skipped and every
> pagecache folio split case of split_huge_page_test is skipped with "No
> large pagecache folio generated".
>
> Load xfs with load_module() when it is not registered yet, so that it
> is unloaded again once the script is done. Match xfs as a whole word,
> as "selinuxfs" contains it too, as does "vxfs" on kernels before 7.3,
> and would otherwise skip the load and leave xfs to be loaded by
> mount(). "run_vmtests.sh -t thp" with xfs built as a module and not
> loaded:
>
>                                         before    after
>   khugepaged all:file                  skipped      run
>   skipped split_huge_page_test cases        43        0
>   xfs loaded after the run                  no       no
>   xfs loaded after the run, with
>   selinuxfs or vxfs registered             yes       no
>
> Fixes: fc4d182316bd ("mm: huge_memory: enable debugfs to split huge pages to any order")
> Signed-off-by: Qiliang Yuan <odys.yuan@gmail.com>
> ---
>  tools/testing/selftests/mm/run_vmtests.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>

Thanks.

Acked-by: Zi Yan <ziy@nvidia.com>

Best Regards,
Yan, Zi