Re: [PATCHi v2] mm: put_and_wait_on_page_locked() while page is migrated

[Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>]

On Mon, Nov 26, 2018 at 11:27 AM Hugh Dickins <hughd@xxxxxxxxxx> wrote:
>
> +enum behavior {
> +       EXCLUSIVE,      /* Hold ref to page and take the bit when woken, like
> +                        * __lock_page() waiting on then setting PG_locked.
> +                        */
> +       SHARED,         /* Hold ref to page and check the bit when woken, like
> +                        * wait_on_page_writeback() waiting on PG_writeback.
> +                        */
> +       DROP,           /* Drop ref to page before wait, no check when woken,
> +                        * like put_and_wait_on_page_locked() on PG_locked.
> +                        */
> +};

Ack, thanks.

                Linus