On Fri 23-12-22 03:16:41, Kemeng Shi wrote:
> bfqd->bfq_wr_max_softrt_rate is assigned with 7000 in bfq_init_queue and
> never changed. So we can remove bfqd->bfq_wr_max_softrt_rate > 0 check
> which is always true.
>
> Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
I would just leave these checks for documentation purposes and for possible
experiments (e.g. disabling this logic by setting bfq_wr_max_softrt_rate to
0). Alternatively, we could just define a constant for this and
then we can remove all the checks, that would be a clean solution as well.
Honza
> ---
> block/bfq-iosched.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
> index 91bc68fba72d..00cdd42ac02a 100644
> --- a/block/bfq-iosched.c
> +++ b/block/bfq-iosched.c
> @@ -1788,8 +1788,7 @@ static void bfq_bfqq_handle_idle_busy_switch(struct bfq_data *bfqd,
> * to control its weight explicitly)
> */
> in_burst = bfq_bfqq_in_large_burst(bfqq);
> - soft_rt = bfqd->bfq_wr_max_softrt_rate > 0 &&
> - !BFQQ_TOTALLY_SEEKY(bfqq) &&
> + soft_rt = !BFQQ_TOTALLY_SEEKY(bfqq) &&
> !in_burst &&
> time_is_before_jiffies(bfqq->soft_rt_next_start) &&
> bfqq->dispatched == 0 &&
> @@ -4284,8 +4283,7 @@ void bfq_bfqq_expire(struct bfq_data *bfqd,
> if (bfqd->low_latency && bfqq->wr_coeff == 1)
> bfqq->last_wr_start_finish = jiffies;
>
> - if (bfqd->low_latency && bfqd->bfq_wr_max_softrt_rate > 0 &&
> - RB_EMPTY_ROOT(&bfqq->sort_list)) {
> + if (bfqd->low_latency && RB_EMPTY_ROOT(&bfqq->sort_list)) {
> /*
> * If we get here, and there are no outstanding
> * requests, then the request pattern is isochronous
> --
> 2.30.0
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
