Re: [RFC PATCH 1/7] Fix khugepaged's request size in collapse_file()

[Song Liu]

On Tue, Sep 1, 2020 at 9:28 AM David Howells <dhowells@xxxxxxxxxx> wrote:
>
> collapse_file() in khugepaged passes PAGE_SIZE as the number of pages to be
> read ahead to page_cache_sync_readahead().  It seems this was expressed as a
> number of bytes rather than a number of pages.
>
> Fix it to use the number of pages to the end of the window instead.
>
> Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS")
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
> cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> cc: Song Liu <songliubraving@xxxxxx>

Thanks for the fix!

Acked-by: Song Liu <songliubraving@xxxxxx>

> ---
>
>  mm/khugepaged.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index 6d199c353281..f2d243077b74 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -1706,7 +1706,7 @@ static void collapse_file(struct mm_struct *mm,
>                                 xas_unlock_irq(&xas);
>                                 page_cache_sync_readahead(mapping, &file->f_ra,
>                                                           file, index,
> -                                                         PAGE_SIZE);
> +                                                         end - index);
>                                 /* drain pagevecs to help isolate_lru_page() */
>                                 lru_add_drain();
>                                 page = find_lock_page(mapping, index);
>
>
>