Re: [PATCH 4/4] md: cleanup accounting for issued sync IO

[Xiao Ni <xni@redhat.com>]

在 2025/4/12 下午3:32, Yu Kuai 写道:
> From: Yu Kuai <yukuai3@huawei.com>
>
> It's no longer used and can be removed, also remove the field
> 'gendisk->sync_io'.
>
> Signed-off-by: Yu Kuai <yukuai3@huawei.com>
> ---
>   drivers/md/md.h        | 11 -----------
>   drivers/md/raid1.c     |  3 ---
>   drivers/md/raid10.c    |  9 ---------
>   drivers/md/raid5.c     |  8 --------
>   include/linux/blkdev.h |  1 -
>   5 files changed, 32 deletions(-)
>
> diff --git a/drivers/md/md.h b/drivers/md/md.h
> index 95cf11c4abc6..6233ec9f10a3 100644
> --- a/drivers/md/md.h
> +++ b/drivers/md/md.h
> @@ -716,17 +716,6 @@ static inline int mddev_trylock(struct mddev *mddev)
>   }
>   extern void mddev_unlock(struct mddev *mddev);
>   
> -static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors)
> -{
> -	if (blk_queue_io_stat(bdev->bd_disk->queue))
> -		atomic_add(nr_sectors, &bdev->bd_disk->sync_io);
> -}
> -
> -static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors)
> -{
> -	md_sync_acct(bio->bi_bdev, nr_sectors);
> -}
> -
>   struct md_personality
>   {
>   	struct md_submodule_head head;
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index de9bccbe7337..657d481525be 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -2382,7 +2382,6 @@ static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio)
>   
>   		wbio->bi_end_io = end_sync_write;
>   		atomic_inc(&r1_bio->remaining);
> -		md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio));
>   
>   		submit_bio_noacct(wbio);
>   	}
> @@ -3055,7 +3054,6 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
>   			bio = r1_bio->bios[i];
>   			if (bio->bi_end_io == end_sync_read) {
>   				read_targets--;
> -				md_sync_acct_bio(bio, nr_sectors);
>   				if (read_targets == 1)
>   					bio->bi_opf &= ~MD_FAILFAST;
>   				submit_bio_noacct(bio);
> @@ -3064,7 +3062,6 @@ static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr,
>   	} else {
>   		atomic_set(&r1_bio->remaining, 1);
>   		bio = r1_bio->bios[r1_bio->read_disk];
> -		md_sync_acct_bio(bio, nr_sectors);
>   		if (read_targets == 1)
>   			bio->bi_opf &= ~MD_FAILFAST;
>   		submit_bio_noacct(bio);
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index ba32bac975b8..dce06bf65016 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -2426,7 +2426,6 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
>   
>   		atomic_inc(&conf->mirrors[d].rdev->nr_pending);
>   		atomic_inc(&r10_bio->remaining);
> -		md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(tbio));
>   
>   		if (test_bit(FailFast, &conf->mirrors[d].rdev->flags))
>   			tbio->bi_opf |= MD_FAILFAST;
> @@ -2448,8 +2447,6 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
>   			bio_copy_data(tbio, fbio);
>   		d = r10_bio->devs[i].devnum;
>   		atomic_inc(&r10_bio->remaining);
> -		md_sync_acct(conf->mirrors[d].replacement->bdev,
> -			     bio_sectors(tbio));
>   		submit_bio_noacct(tbio);
>   	}
>   
> @@ -2583,13 +2580,10 @@ static void recovery_request_write(struct mddev *mddev, struct r10bio *r10_bio)
>   	d = r10_bio->devs[1].devnum;
>   	if (wbio->bi_end_io) {
>   		atomic_inc(&conf->mirrors[d].rdev->nr_pending);
> -		md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(wbio));
>   		submit_bio_noacct(wbio);
>   	}
>   	if (wbio2) {
>   		atomic_inc(&conf->mirrors[d].replacement->nr_pending);
> -		md_sync_acct(conf->mirrors[d].replacement->bdev,
> -			     bio_sectors(wbio2));
>   		submit_bio_noacct(wbio2);
>   	}
>   }
> @@ -3757,7 +3751,6 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
>   		r10_bio->sectors = nr_sectors;
>   
>   		if (bio->bi_end_io == end_sync_read) {
> -			md_sync_acct_bio(bio, nr_sectors);
>   			bio->bi_status = 0;
>   			submit_bio_noacct(bio);
>   		}
> @@ -4880,7 +4873,6 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
>   	r10_bio->sectors = nr_sectors;
>   
>   	/* Now submit the read */
> -	md_sync_acct_bio(read_bio, r10_bio->sectors);
>   	atomic_inc(&r10_bio->remaining);
>   	read_bio->bi_next = NULL;
>   	submit_bio_noacct(read_bio);
> @@ -4940,7 +4932,6 @@ static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio)
>   			continue;
>   
>   		atomic_inc(&rdev->nr_pending);
> -		md_sync_acct_bio(b, r10_bio->sectors);
>   		atomic_inc(&r10_bio->remaining);
>   		b->bi_next = NULL;
>   		submit_bio_noacct(b);
> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
> index 6389383166c0..ca5b0e8ba707 100644
> --- a/drivers/md/raid5.c
> +++ b/drivers/md/raid5.c
> @@ -1240,10 +1240,6 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
>   		}
>   
>   		if (rdev) {
> -			if (s->syncing || s->expanding || s->expanded
> -			    || s->replacing)
> -				md_sync_acct(rdev->bdev, RAID5_STRIPE_SECTORS(conf));
> -
>   			set_bit(STRIPE_IO_STARTED, &sh->state);
>   
>   			bio_init(bi, rdev->bdev, &dev->vec, 1, op | op_flags);
> @@ -1300,10 +1296,6 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
>   				submit_bio_noacct(bi);
>   		}
>   		if (rrdev) {
> -			if (s->syncing || s->expanding || s->expanded
> -			    || s->replacing)
> -				md_sync_acct(rrdev->bdev, RAID5_STRIPE_SECTORS(conf));
> -
>   			set_bit(STRIPE_IO_STARTED, &sh->state);
>   
>   			bio_init(rbi, rrdev->bdev, &dev->rvec, 1, op | op_flags);
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index e39c45bc0a97..f3a625b00734 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -182,7 +182,6 @@ struct gendisk {
>   	struct list_head slave_bdevs;
>   #endif
>   	struct timer_rand_state *random;
> -	atomic_t sync_io;		/* RAID */
>   	struct disk_events *ev;
>   
>   #ifdef CONFIG_BLK_DEV_ZONED


Looks good to me.

Acked-by: Xiao Ni <xni@redhat.com>