On Sat, Jun 24 2006, Fengguang Wu wrote:
> Introduce deadline_kick_page() to
> - find the request containing the page
> - remove its BIO_RW_AHEAD flag
> - reschedule if it was of type READA
>
> Signed-off-by: Wu Fengguang <[email protected]>
> ---
>
>
> block/deadline-iosched.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
> 1 files changed, 43 insertions(+), 2 deletions(-)
>
> --- linux-2.6.17-rc6-mm2.orig/block/deadline-iosched.c
> +++ linux-2.6.17-rc6-mm2/block/deadline-iosched.c
> @@ -317,6 +317,44 @@ deadline_add_request(struct request_queu
> }
>
> /*
> + * We have a pending read on @page,
> + * find the corresponding request of type READA,
> + * promote it to READ, and reschedule it.
> + */
> +static int
> +deadline_kick_page(struct request_queue *q, struct page *page)
> +{
> + struct deadline_data *dd = q->elevator->elevator_data;
> + struct deadline_rq *drq;
> + struct request *rq;
> + struct list_head *pos;
> + struct bio_vec *bvec;
> + struct bio *bio;
> + int i;
> +
> + list_for_each(pos, &dd->fifo_list[READ]) {
> + drq = list_entry_fifo(pos);
> + rq = drq->request;
> + if (rq->flags & (1 << BIO_RW_AHEAD)) {
> + rq_for_each_bio(bio, rq) {
> + bio_for_each_segment(bvec, bio, i) {
> + if (page == bvec->bv_page)
> + goto found;
> + }
> + }
> + }
> + }
Uh that's horrible!
Before we go into further details, I'd like to see some numbers on where
this makes a difference.
--
Jens Axboe
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