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authorDivyesh Shah <dpshah@google.com>2010-04-01 15:01:41 -0700
committerJens Axboe <jens.axboe@oracle.com>2010-04-02 08:44:37 +0200
commit9195291e5f05e01d67f9a09c756b8aca8f009089 (patch)
treee46a151fe39be2bc23d0683bedb2cbefe916fb5b /include/linux/blkdev.h
parent303a3acb2362f16c7e7f4c53b40c2f4b396dc8d5 (diff)
blkio: Increment the blkio cgroup stats for real now
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>
Diffstat (limited to 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h20
1 files changed, 19 insertions, 1 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 6690e8bae7b..f3fff8bf85e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -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) \