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md: use generic io stats accounting functions to simplify io stat accounting

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Use generic io stats accounting help functions (generic_{start,end}_io_acct)
to simplify io stat accounting.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Gu Zheng 2014-11-24 11:05:26 +08:00 committed by Jens Axboe
parent 244808543e
commit 18c0b223cf
2 changed files with 4 additions and 15 deletions
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13
drivers/md/dm.c
View file

@ -602,13 +602,10 @@ static void end_io_acct(struct dm_io *io)
struct mapped_device *md = io->md;
struct bio *bio = io->bio;
unsigned long duration = jiffies - io->start_time;
int pending, cpu;
int pending;
int rw = bio_data_dir(bio);
cpu = part_stat_lock();
part_round_stats(cpu, &dm_disk(md)->part0);
part_stat_add(cpu, &dm_disk(md)->part0, ticks[rw], duration);
part_stat_unlock();
generic_end_io_acct(rw, &dm_disk(md)->part0, io->start_time);
if (unlikely(dm_stats_used(&md->stats)))
dm_stats_account_io(&md->stats, bio->bi_rw, bio->bi_iter.bi_sector,
@ -1648,16 +1645,12 @@ static void _dm_request(struct request_queue *q, struct bio *bio)
{
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
int cpu;
int srcu_idx;
struct dm_table *map;
map = dm_get_live_table(md, &srcu_idx);
cpu = part_stat_lock();
part_stat_inc(cpu, &dm_disk(md)->part0, ios[rw]);
part_stat_add(cpu, &dm_disk(md)->part0, sectors[rw], bio_sectors(bio));
part_stat_unlock();
generic_start_io_acct(rw, bio_sectors(bio), &dm_disk(md)->part0);
/* if we're suspended, we have to queue this io for later */
if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) {

6
drivers/md/md.c
View file

@ -247,7 +247,6 @@ static void md_make_request(struct request_queue *q, struct bio *bio)
{
const int rw = bio_data_dir(bio);
struct mddev *mddev = q->queuedata;
int cpu;
unsigned int sectors;
if (mddev == NULL || mddev->pers == NULL
@ -284,10 +283,7 @@ static void md_make_request(struct request_queue *q, struct bio *bio)
sectors = bio_sectors(bio);
mddev->pers->make_request(mddev, bio);
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
part_stat_unlock();
generic_start_io_acct(rw, sectors, &mddev->gendisk->part0);
if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
wake_up(&mddev->sb_wait);