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Subject: Re: [PATCH 05/16] bcache: use bio_{start,end}_io_acct
To:     Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>
Cc:     Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
        Minchan Kim <minchan@kernel.org>,
        Nitin Gupta <ngupta@vflare.org>, dm-devel@redhat.com,
        linux-block@vger.kernel.org, drbd-dev@lists.linbit.com,
        linux-bcache@vger.kernel.org, linux-nvdimm@lists.01.org,
        linux-kernel@vger.kernel.org
References: <20200525113014.345997-1-hch@lst.de>
 <20200525113014.345997-6-hch@lst.de>
From:   Coly Li <colyli@suse.de>
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Message-ID: <85828157-ac53-57e8-1a27-068478ab5f5c@suse.de>
Date:   Mon, 25 May 2020 21:03:39 +0800
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Precedence: bulk

On 2020/5/25 19:30, Christoph Hellwig wrote:
> Switch bcache to use the nicer bio accounting helpers, and call the
> routines where we also sample the start time to give coherent accounting
> results.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Acked-by: Coly Li <colyli@suse.de>


Coly Li

> ---
>  drivers/md/bcache/request.c | 18 ++++--------------
>  1 file changed, 4 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
> index 77d1a26975174..22b483527176b 100644
> --- a/drivers/md/bcache/request.c
> +++ b/drivers/md/bcache/request.c
> @@ -668,9 +668,7 @@ static void backing_request_endio(struct bio *bio)
>  static void bio_complete(struct search *s)
>  {
>  	if (s->orig_bio) {
> -		generic_end_io_acct(s->d->disk->queue, bio_op(s->orig_bio),
> -				    &s->d->disk->part0, s->start_time);
> -
> +		bio_end_io_acct(s->orig_bio, s->start_time);
>  		trace_bcache_request_end(s->d, s->orig_bio);
>  		s->orig_bio->bi_status = s->iop.status;
>  		bio_endio(s->orig_bio);
> @@ -730,7 +728,7 @@ static inline struct search *search_alloc(struct bio *bio,
>  	s->recoverable		= 1;
>  	s->write		= op_is_write(bio_op(bio));
>  	s->read_dirty_data	= 0;
> -	s->start_time		= jiffies;
> +	s->start_time		= bio_start_io_acct(bio);
>  
>  	s->iop.c		= d->c;
>  	s->iop.bio		= NULL;
> @@ -1082,8 +1080,7 @@ static void detached_dev_end_io(struct bio *bio)
>  	bio->bi_end_io = ddip->bi_end_io;
>  	bio->bi_private = ddip->bi_private;
>  
> -	generic_end_io_acct(ddip->d->disk->queue, bio_op(bio),
> -			    &ddip->d->disk->part0, ddip->start_time);
> +	bio_end_io_acct(bio, ddip->start_time);
>  
>  	if (bio->bi_status) {
>  		struct cached_dev *dc = container_of(ddip->d,
> @@ -1108,7 +1105,7 @@ static void detached_dev_do_request(struct bcache_device *d, struct bio *bio)
>  	 */
>  	ddip = kzalloc(sizeof(struct detached_dev_io_private), GFP_NOIO);
>  	ddip->d = d;
> -	ddip->start_time = jiffies;
> +	ddip->start_time = bio_start_io_acct(bio);
>  	ddip->bi_end_io = bio->bi_end_io;
>  	ddip->bi_private = bio->bi_private;
>  	bio->bi_end_io = detached_dev_end_io;
> @@ -1190,11 +1187,6 @@ blk_qc_t cached_dev_make_request(struct request_queue *q, struct bio *bio)
>  		}
>  	}
>  
> -	generic_start_io_acct(q,
> -			      bio_op(bio),
> -			      bio_sectors(bio),
> -			      &d->disk->part0);
> -
>  	bio_set_dev(bio, dc->bdev);
>  	bio->bi_iter.bi_sector += dc->sb.data_offset;
>  
> @@ -1311,8 +1303,6 @@ blk_qc_t flash_dev_make_request(struct request_queue *q, struct bio *bio)
>  		return BLK_QC_T_NONE;
>  	}
>  
> -	generic_start_io_acct(q, bio_op(bio), bio_sectors(bio), &d->disk->part0);
> -
>  	s = search_alloc(bio, d);
>  	cl = &s->cl;
>  	bio = &s->bio.bio;
>