Add options to have fio latency profile a device
This adds three new options:
- latency_target. This defines a specific latency target, in usec.
- latency_window. This defines the period over which fio samples.
- latency_percentile. This defines the percentage of IOs that must
meet the criteria specified by latency_target/latency_window.
With these options set, fio will run the described workload and
vary the queue depth between 1 and iodepth= to find the best
performing spot that meets the criteria specified by the three
options.
A sample job file is also added to demonstrate how to use this.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/ioengine.h b/ioengine.h
index 31662eb..6dd2aa4 100644
--- a/ioengine.h
+++ b/ioengine.h
@@ -188,7 +188,6 @@
/*
* io unit handling
*/
-#define queue_full(td) io_u_qempty(&(td)->io_u_freelist)
extern struct io_u *__get_io_u(struct thread_data *);
extern struct io_u *get_io_u(struct thread_data *);
extern void put_io_u(struct thread_data *, struct io_u *);
@@ -204,6 +203,7 @@
extern void io_u_fill_buffer(struct thread_data *td, struct io_u *, unsigned int, unsigned int);
void io_u_mark_complete(struct thread_data *, unsigned int);
void io_u_mark_submit(struct thread_data *, unsigned int);
+int queue_full(struct thread_data *);
int do_io_u_sync(struct thread_data *, struct io_u *);
int do_io_u_trim(struct thread_data *, struct io_u *);