linux-kernel - Re: dm: fix parameter to blk_delay

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Date:	Fri, 15 Jul 2016 09:59:05 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Tahsin Erdogan <tahsin@...gle.com>
Cc:	Alasdair Kergon <agk@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	dm-devel@...hat.com, Shaohua Li <shli@...nel.org>,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: dm: fix parameter to blk_delay_queue()

On Fri, Jul 15 2016 at  9:27am -0400,
Tahsin Erdogan <tahsin@...gle.com> wrote:

> Second parameter to blk_delay_queue() must be in msec units not jiffies.
> 
> Signed-off-by: Tahsin Erdogan <tahsin@...gle.com>

This needs to be rebased against linux-next (or linux-dm.git's
'for-next') because the code in question has been moved out to dm-rq.c

But I'll gladly take care of it.

Your change seems fine, and in fact my intent was always to have it be
10 msec, see commit: d548b34b062b60

Curious that the initial "HZ / 10" (from Jens' commit 7eaceaccab) wasn't
expressed in terms of msecs either.

Anyway, thanks for the fix!

Mike

> ---
>  drivers/md/dm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index 1b2f96205361..17c63265a205 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -2175,7 +2175,7 @@ static void dm_request_fn(struct request_queue *q)
>  		     md_in_flight(md) && rq->bio && rq->bio->bi_vcnt == 1 &&
>  		     md->last_rq_pos == pos && md->last_rq_rw == rq_data_dir(rq)) ||
>  		    (ti->type->busy && ti->type->busy(ti))) {
> -			blk_delay_queue(q, HZ / 100);
> +			blk_delay_queue(q, 10);
>  			return;
>  		}
>  
> -- 
> 2.8.0.rc3.226.g39d4020
>