From d72d904a5367ad4ca3f2c9a2ce8c3a68f0b28bf0 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 1 Nov 2005 08:35:42 +0100 Subject: [BLOCK] Update read/write block io statistics at completion time Right now we do it at queueing time, which works alright for reads (since they are usually sync), but not for async writes since we can queue io a lot faster than we can complete it. This makes the vmstat output look extremely bursty. Signed-off-by: Jens Axboe --- drivers/block/ll_rw_blk.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) (limited to 'drivers') diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c index 0af73512b9a..1b272883aad 100644 --- a/drivers/block/ll_rw_blk.c +++ b/drivers/block/ll_rw_blk.c @@ -2387,16 +2387,12 @@ static void drive_stat_acct(struct request *rq, int nr_sectors, int new_io) if (!blk_fs_request(rq) || !rq->rq_disk) return; - if (rw == READ) { - __disk_stat_add(rq->rq_disk, read_sectors, nr_sectors); - if (!new_io) + if (!new_io) { + if (rw == READ) __disk_stat_inc(rq->rq_disk, read_merges); - } else if (rw == WRITE) { - __disk_stat_add(rq->rq_disk, write_sectors, nr_sectors); - if (!new_io) + else __disk_stat_inc(rq->rq_disk, write_merges); - } - if (new_io) { + } else { disk_round_stats(rq->rq_disk); rq->rq_disk->in_flight++; } @@ -3048,6 +3044,13 @@ static int __end_that_request_first(struct request *req, int uptodate, (unsigned long long)req->sector); } + if (blk_fs_request(req) && req->rq_disk) { + if (rq_data_dir(req) == READ) + __disk_stat_add(req->rq_disk, read_sectors, nr_bytes >> 9); + else + __disk_stat_add(req->rq_disk, write_sectors, nr_bytes >> 9); + } + total_bytes = bio_nbytes = 0; while ((bio = req->bio) != NULL) { int nbytes; -- cgit v1.2.3 From a362357b6cd62643d4dda3b152639303d78473da Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 1 Nov 2005 09:26:16 +0100 Subject: [BLOCK] Unify the seperate read/write io stat fields into arrays Instead of having ->read_sectors and ->write_sectors, combine the two into ->sectors[2] and similar for the other fields. This saves a branch several places in the io path, since we don't have to care for what the actual io direction is. On my x86-64 box, that's 200 bytes less text in just the core (not counting the various drivers). Signed-off-by: Jens Axboe --- drivers/block/genhd.c | 29 ++++++++++++++--------------- drivers/block/ll_rw_blk.c | 40 ++++++++++++---------------------------- drivers/md/linear.c | 10 +++------- drivers/md/md.c | 4 ++-- drivers/md/multipath.c | 10 +++------- drivers/md/raid0.c | 10 +++------- drivers/md/raid1.c | 12 ++++-------- drivers/md/raid10.c | 12 ++++-------- drivers/md/raid5.c | 10 +++------- drivers/md/raid6main.c | 12 ++++-------- 10 files changed, 52 insertions(+), 97 deletions(-) (limited to 'drivers') diff --git a/drivers/block/genhd.c b/drivers/block/genhd.c index 486ce1fdeb8..54aec4a1ae1 100644 --- a/drivers/block/genhd.c +++ b/drivers/block/genhd.c @@ -391,13 +391,12 @@ static ssize_t disk_stats_read(struct gendisk * disk, char *page) "%8u %8u %8llu %8u " "%8u %8u %8u" "\n", - disk_stat_read(disk, reads), disk_stat_read(disk, read_merges), - (unsigned long long)disk_stat_read(disk, read_sectors), - jiffies_to_msecs(disk_stat_read(disk, read_ticks)), - disk_stat_read(disk, writes), - disk_stat_read(disk, write_merges), - (unsigned long long)disk_stat_read(disk, write_sectors), - jiffies_to_msecs(disk_stat_read(disk, write_ticks)), + disk_stat_read(disk, ios[0]), disk_stat_read(disk, merges[0]), + (unsigned long long)disk_stat_read(disk, sectors[0]), + jiffies_to_msecs(disk_stat_read(disk, ticks[0])), + disk_stat_read(disk, ios[1]), disk_stat_read(disk, merges[1]), + (unsigned long long)disk_stat_read(disk, sectors[1]), + jiffies_to_msecs(disk_stat_read(disk, ticks[1])), disk->in_flight, jiffies_to_msecs(disk_stat_read(disk, io_ticks)), jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); @@ -583,12 +582,12 @@ static int diskstats_show(struct seq_file *s, void *v) preempt_enable(); seq_printf(s, "%4d %4d %s %u %u %llu %u %u %u %llu %u %u %u %u\n", gp->major, n + gp->first_minor, disk_name(gp, n, buf), - disk_stat_read(gp, reads), disk_stat_read(gp, read_merges), - (unsigned long long)disk_stat_read(gp, read_sectors), - jiffies_to_msecs(disk_stat_read(gp, read_ticks)), - disk_stat_read(gp, writes), disk_stat_read(gp, write_merges), - (unsigned long long)disk_stat_read(gp, write_sectors), - jiffies_to_msecs(disk_stat_read(gp, write_ticks)), + disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), + (unsigned long long)disk_stat_read(gp, sectors[0]), + jiffies_to_msecs(disk_stat_read(gp, ticks[0])), + disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), + (unsigned long long)disk_stat_read(gp, sectors[1]), + jiffies_to_msecs(disk_stat_read(gp, ticks[1])), gp->in_flight, jiffies_to_msecs(disk_stat_read(gp, io_ticks)), jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); @@ -601,8 +600,8 @@ static int diskstats_show(struct seq_file *s, void *v) seq_printf(s, "%4d %4d %s %u %u %u %u\n", gp->major, n + gp->first_minor + 1, disk_name(gp, n + 1, buf), - hd->reads, hd->read_sectors, - hd->writes, hd->write_sectors); + hd->ios[0], hd->sectors[0], + hd->ios[1], hd->sectors[1]); } return 0; diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c index 1b272883aad..2747741677f 100644 --- a/drivers/block/ll_rw_blk.c +++ b/drivers/block/ll_rw_blk.c @@ -2388,10 +2388,7 @@ static void drive_stat_acct(struct request *rq, int nr_sectors, int new_io) return; if (!new_io) { - if (rw == READ) - __disk_stat_inc(rq->rq_disk, read_merges); - else - __disk_stat_inc(rq->rq_disk, write_merges); + __disk_stat_inc(rq->rq_disk, merges[rw]); } else { disk_round_stats(rq->rq_disk); rq->rq_disk->in_flight++; @@ -2787,17 +2784,11 @@ static inline void blk_partition_remap(struct bio *bio) if (bdev != bdev->bd_contains) { struct hd_struct *p = bdev->bd_part; + const int rw = bio_data_dir(bio); + + p->sectors[rw] += bio_sectors(bio); + p->ios[rw]++; - switch (bio_data_dir(bio)) { - case READ: - p->read_sectors += bio_sectors(bio); - p->reads++; - break; - case WRITE: - p->write_sectors += bio_sectors(bio); - p->writes++; - break; - } bio->bi_sector += p->start_sect; bio->bi_bdev = bdev->bd_contains; } @@ -3045,10 +3036,9 @@ static int __end_that_request_first(struct request *req, int uptodate, } if (blk_fs_request(req) && req->rq_disk) { - if (rq_data_dir(req) == READ) - __disk_stat_add(req->rq_disk, read_sectors, nr_bytes >> 9); - else - __disk_stat_add(req->rq_disk, write_sectors, nr_bytes >> 9); + const int rw = rq_data_dir(req); + + __disk_stat_add(req->rq_disk, sectors[rw], nr_bytes >> 9); } total_bytes = bio_nbytes = 0; @@ -3179,16 +3169,10 @@ void end_that_request_last(struct request *req) if (disk && blk_fs_request(req)) { unsigned long duration = jiffies - req->start_time; - switch (rq_data_dir(req)) { - case WRITE: - __disk_stat_inc(disk, writes); - __disk_stat_add(disk, write_ticks, duration); - break; - case READ: - __disk_stat_inc(disk, reads); - __disk_stat_add(disk, read_ticks, duration); - break; - } + const int rw = rq_data_dir(req); + + __disk_stat_inc(disk, ios[rw]); + __disk_stat_add(disk, ticks[rw], duration); disk_round_stats(disk); disk->in_flight--; } diff --git a/drivers/md/linear.c b/drivers/md/linear.c index bb279fad2fd..946efef3a8f 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -271,6 +271,7 @@ static int linear_stop (mddev_t *mddev) static int linear_make_request (request_queue_t *q, struct bio *bio) { + const int rw = bio_data_dir(bio); mddev_t *mddev = q->queuedata; dev_info_t *tmp_dev; sector_t block; @@ -280,13 +281,8 @@ static int linear_make_request (request_queue_t *q, struct bio *bio) return 0; } - if (bio_data_dir(bio)==WRITE) { - disk_stat_inc(mddev->gendisk, writes); - disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio)); - } else { - disk_stat_inc(mddev->gendisk, reads); - disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bio)); - } + disk_stat_inc(mddev->gendisk, ios[rw]); + disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); tmp_dev = which_dev(mddev, bio->bi_sector); block = bio->bi_sector >> 1; diff --git a/drivers/md/md.c b/drivers/md/md.c index 2a8a5696bf8..9ecf51ee596 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -3466,8 +3466,8 @@ static int is_mddev_idle(mddev_t *mddev) idle = 1; ITERATE_RDEV(mddev,rdev,tmp) { struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; - curr_events = disk_stat_read(disk, read_sectors) + - disk_stat_read(disk, write_sectors) - + curr_events = disk_stat_read(disk, sectors[0]) + + disk_stat_read(disk, sectors[1]) - atomic_read(&disk->sync_io); /* Allow some slack between valud of curr_events and last_events, * as there are some uninteresting races. diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index 1151c3ed300..c06f4474192 100644 --- a/drivers/md/multipath.c +++ b/drivers/md/multipath.c @@ -168,6 +168,7 @@ static int multipath_make_request (request_queue_t *q, struct bio * bio) multipath_conf_t *conf = mddev_to_conf(mddev); struct multipath_bh * mp_bh; struct multipath_info *multipath; + const int rw = bio_data_dir(bio); if (unlikely(bio_barrier(bio))) { bio_endio(bio, bio->bi_size, -EOPNOTSUPP); @@ -179,13 +180,8 @@ static int multipath_make_request (request_queue_t *q, struct bio * bio) mp_bh->master_bio = bio; mp_bh->mddev = mddev; - if (bio_data_dir(bio)==WRITE) { - disk_stat_inc(mddev->gendisk, writes); - disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio)); - } else { - disk_stat_inc(mddev->gendisk, reads); - disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bio)); - } + disk_stat_inc(mddev->gendisk, ios[rw]); + disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); mp_bh->path = multipath_map(conf); if (mp_bh->path < 0) { diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index f6757259ce7..fece3277c2a 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -403,19 +403,15 @@ static int raid0_make_request (request_queue_t *q, struct bio *bio) mdk_rdev_t *tmp_dev; unsigned long chunk; sector_t block, rsect; + const int rw = bio_data_dir(bio); if (unlikely(bio_barrier(bio))) { bio_endio(bio, bio->bi_size, -EOPNOTSUPP); return 0; } - if (bio_data_dir(bio)==WRITE) { - disk_stat_inc(mddev->gendisk, writes); - disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio)); - } else { - disk_stat_inc(mddev->gendisk, reads); - disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bio)); - } + disk_stat_inc(mddev->gendisk, ios[rw]); + disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); chunk_size = mddev->chunk_size >> 10; chunk_sects = mddev->chunk_size >> 9; diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 0e1f148dd41..e16f473bcf4 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -647,6 +647,7 @@ static int make_request(request_queue_t *q, struct bio * bio) unsigned long flags; struct bio_list bl; struct page **behind_pages = NULL; + const int rw = bio_data_dir(bio); if (unlikely(bio_barrier(bio))) { bio_endio(bio, bio->bi_size, -EOPNOTSUPP); @@ -665,13 +666,8 @@ static int make_request(request_queue_t *q, struct bio * bio) conf->nr_pending++; spin_unlock_irq(&conf->resync_lock); - if (bio_data_dir(bio)==WRITE) { - disk_stat_inc(mddev->gendisk, writes); - disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio)); - } else { - disk_stat_inc(mddev->gendisk, reads); - disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bio)); - } + disk_stat_inc(mddev->gendisk, ios[rw]); + disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); /* * make_request() can abort the operation when READA is being @@ -686,7 +682,7 @@ static int make_request(request_queue_t *q, struct bio * bio) r1_bio->mddev = mddev; r1_bio->sector = bio->bi_sector; - if (bio_data_dir(bio) == READ) { + if (rw == READ) { /* * read balancing logic: */ diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 28dd028415e..bbe40e9cf92 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -668,6 +668,7 @@ static int make_request(request_queue_t *q, struct bio * bio) struct bio *read_bio; int i; int chunk_sects = conf->chunk_mask + 1; + const int rw = bio_data_dir(bio); if (unlikely(bio_barrier(bio))) { bio_endio(bio, bio->bi_size, -EOPNOTSUPP); @@ -718,13 +719,8 @@ static int make_request(request_queue_t *q, struct bio * bio) conf->nr_pending++; spin_unlock_irq(&conf->resync_lock); - if (bio_data_dir(bio)==WRITE) { - disk_stat_inc(mddev->gendisk, writes); - disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio)); - } else { - disk_stat_inc(mddev->gendisk, reads); - disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bio)); - } + disk_stat_inc(mddev->gendisk, ios[rw]); + disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); @@ -734,7 +730,7 @@ static int make_request(request_queue_t *q, struct bio * bio) r10_bio->mddev = mddev; r10_bio->sector = bio->bi_sector; - if (bio_data_dir(bio) == READ) { + if (rw == READ) { /* * read balancing logic: */ diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 4683ca24c04..6497295ebfb 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -1462,6 +1462,7 @@ static int make_request (request_queue_t *q, struct bio * bi) sector_t new_sector; sector_t logical_sector, last_sector; struct stripe_head *sh; + const int rw = bio_data_dir(bi); if (unlikely(bio_barrier(bi))) { bio_endio(bi, bi->bi_size, -EOPNOTSUPP); @@ -1470,13 +1471,8 @@ static int make_request (request_queue_t *q, struct bio * bi) md_write_start(mddev, bi); - if (bio_data_dir(bi)==WRITE) { - disk_stat_inc(mddev->gendisk, writes); - disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bi)); - } else { - disk_stat_inc(mddev->gendisk, reads); - disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bi)); - } + disk_stat_inc(mddev->gendisk, ios[rw]); + disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi)); logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); last_sector = bi->bi_sector + (bi->bi_size>>9); diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c index 267eb1430c8..6437a95ffc1 100644 --- a/drivers/md/raid6main.c +++ b/drivers/md/raid6main.c @@ -1621,6 +1621,7 @@ static int make_request (request_queue_t *q, struct bio * bi) sector_t new_sector; sector_t logical_sector, last_sector; struct stripe_head *sh; + const int rw = bio_data_dir(bi); if (unlikely(bio_barrier(bi))) { bio_endio(bi, bi->bi_size, -EOPNOTSUPP); @@ -1629,13 +1630,8 @@ static int make_request (request_queue_t *q, struct bio * bi) md_write_start(mddev, bi); - if (bio_data_dir(bi)==WRITE) { - disk_stat_inc(mddev->gendisk, writes); - disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bi)); - } else { - disk_stat_inc(mddev->gendisk, reads); - disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bi)); - } + disk_stat_inc(mddev->gendisk, ios[rw]); + disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi)); logical_sector = bi->bi_sector & ~((sector_t)STRIPE_SECTORS-1); last_sector = bi->bi_sector + (bi->bi_size>>9); @@ -1682,7 +1678,7 @@ static int make_request (request_queue_t *q, struct bio * bi) if (--bi->bi_phys_segments == 0) { int bytes = bi->bi_size; - if ( bio_data_dir(bi) == WRITE ) + if (rw == WRITE ) md_write_end(mddev); bi->bi_size = 0; bi->bi_end_io(bi, bytes, 0); -- cgit v1.2.3 From 496456c24f1f4280d50b81aa5bf439ab440b3d7e Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 1 Nov 2005 09:54:23 +0100 Subject: [BLOCK] aoe: update for combined io statistics Signed-off-by: Jens Axboe --- drivers/block/aoe/aoecmd.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) (limited to 'drivers') diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index 5c9c7c1a3d4..326ca3876b6 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -468,16 +468,11 @@ aoecmd_ata_rsp(struct sk_buff *skb) unsigned long duration = jiffies - buf->start_time; unsigned long n_sect = buf->bio->bi_size >> 9; struct gendisk *disk = d->gd; + const int rw = bio_data_dir(buf->bio); - if (bio_data_dir(buf->bio) == WRITE) { - disk_stat_inc(disk, writes); - disk_stat_add(disk, write_ticks, duration); - disk_stat_add(disk, write_sectors, n_sect); - } else { - disk_stat_inc(disk, reads); - disk_stat_add(disk, read_ticks, duration); - disk_stat_add(disk, read_sectors, n_sect); - } + disk_stat_inc(disk, ios[rw]); + disk_stat_add(disk, ticks[rw], duration); + disk_stat_add(disk, sectors[rw], n_sect); disk_stat_add(disk, io_ticks, duration); n = (buf->flags & BUFFL_FAIL) ? -EIO : 0; bio_endio(buf->bio, buf->bio->bi_size, n); -- cgit v1.2.3