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

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 11:05:25 +08:00 committed by Jens Axboe
parent aae4933da9
commit 244808543e
1 changed files with 4 additions and 18 deletions
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22
drivers/block/drbd/drbd_req.c
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@ -36,29 +36,15 @@ static bool drbd_may_do_local_read(struct drbd_device *device, sector_t sector,
/* Update disk stats at start of I/O request */
static void _drbd_start_io_acct(struct drbd_device *device, struct drbd_request *req)
{
const int rw = bio_data_dir(req->master_bio);
int cpu;
cpu = part_stat_lock();
part_round_stats(cpu, &device->vdisk->part0);
part_stat_inc(cpu, &device->vdisk->part0, ios[rw]);
part_stat_add(cpu, &device->vdisk->part0, sectors[rw], req->i.size >> 9);
(void) cpu; /* The macro invocations above want the cpu argument, I do not like
the compiler warning about cpu only assigned but never used... */
part_inc_in_flight(&device->vdisk->part0, rw);
part_stat_unlock();
generic_start_io_acct(bio_data_dir(req->master_bio), req->i.size >> 9,
&device->vdisk->part0);
}
/* Update disk stats when completing request upwards */
static void _drbd_end_io_acct(struct drbd_device *device, struct drbd_request *req)
{
int rw = bio_data_dir(req->master_bio);
unsigned long duration = jiffies - req->start_jif;
int cpu;
cpu = part_stat_lock();
part_stat_add(cpu, &device->vdisk->part0, ticks[rw], duration);
part_round_stats(cpu, &device->vdisk->part0);
part_dec_in_flight(&device->vdisk->part0, rw);
part_stat_unlock();
generic_end_io_acct(bio_data_dir(req->master_bio),
&device->vdisk->part0, req->start_jif);
}
static struct drbd_request *drbd_req_new(struct drbd_device *device,