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/client.c b/client.c
index 1557240..7975ce6 100644
--- a/client.c
+++ b/client.c
@@ -796,6 +796,11 @@
dst->first_error = le32_to_cpu(src->first_error);
dst->kb_base = le32_to_cpu(src->kb_base);
dst->unit_base = le32_to_cpu(src->unit_base);
+
+ dst->latency_depth = le32_to_cpu(src->latency_depth);
+ dst->latency_target = le64_to_cpu(src->latency_target);
+ dst->latency_window = le64_to_cpu(src->latency_window);
+ dst->latency_percentile.u.f = fio_uint64_to_double(le64_to_cpu(src->latency_percentile.u.i));
}
static void convert_gs(struct group_run_stats *dst, struct group_run_stats *src)