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blkio: Increment the blkio cgroup stats for real now

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We also add start_time_ns and io_start_time_ns fields to struct request
here to record the time when a request is created and when it is
dispatched to device. We use ns uints here as ms and jiffies are
not very useful for non-rotational media.

Signed-off-by: Divyesh Shah<dpshah@google.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Divyesh Shah
2010-04-01 15:01:41 -07:00
committed by Jens Axboe
parent 303a3acb23
commit 9195291e5f
5 changed files with 95 additions and 9 deletions
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20
include/linux/blkdev.h
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@@ -194,7 +194,10 @@ struct request {
struct gendisk *rq_disk;
unsigned long start_time;
#ifdef CONFIG_BLK_CGROUP
unsigned long long start_time_ns;
unsigned long long io_start_time_ns; /* when passed to hardware */
#endif
/* Number of scatter-gather DMA addr+len pairs after
* physical address coalescing is performed.
*/
@@ -1196,6 +1199,21 @@ static inline void put_dev_sector(Sector p)
struct work_struct;
int kblockd_schedule_work(struct request_queue *q, struct work_struct *work);
#ifdef CONFIG_BLK_CGROUP
static inline void set_start_time_ns(struct request *req)
{
req->start_time_ns = sched_clock();
}
static inline void set_io_start_time_ns(struct request *req)
{
req->io_start_time_ns = sched_clock();
}
#else
static inline void set_start_time_ns(struct request *req) {}
static inline void set_io_start_time_ns(struct request *req) {}
#endif
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \