Re: [PATCH v1 1/6] fs/proc/task_mmu: indicate PM_FILE for PMD-mapped file THP

[Lance Yang]

On Fri, Jun 7, 2024 at 8:24 PM David Hildenbrand <david@xxxxxxxxxx> wrote:
>
> Looks like we never taught pagemap_pmd_range() about the existence of
> PMD-mapped file THPs. Seems to date back to the times when we first added
> support for non-anon THPs in the form of shmem THP.
>
> Fixes: 800d8c63b2e9 ("shmem: add huge pages support")
> Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>

LGTM. Feel free to add:
Reviewed-by: Lance Yang <ioworker0@xxxxxxxxx>

Thanks,
Lance

> ---
>  fs/proc/task_mmu.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 5aceb3db7565e..08465b904ced5 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -1522,6 +1522,8 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
>                 }
>  #endif
>
> +               if (page && !PageAnon(page))
> +                       flags |= PM_FILE;
>                 if (page && !migration && page_mapcount(page) == 1)
>                         flags |= PM_MMAP_EXCLUSIVE;
>
> --
> 2.45.2
>
>