[PATCH] IO completion time histograms
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/io_u.c b/io_u.c
index c56ccc6..132d897 100644
--- a/io_u.c
+++ b/io_u.c
@@ -263,6 +263,40 @@
td->total_io_u++;
}
+static void io_u_mark_latency(struct thread_data *td, unsigned long msec)
+{
+ int index = 0;
+
+ switch (msec) {
+ default:
+ index++;
+ case 1024 ... 2047:
+ index++;
+ case 512 ... 1023:
+ index++;
+ case 256 ... 511:
+ index++;
+ case 128 ... 255:
+ index++;
+ case 64 ... 127:
+ index++;
+ case 32 ... 63:
+ index++;
+ case 16 ... 31:
+ index++;
+ case 8 ... 15:
+ index++;
+ case 4 ... 7:
+ index++;
+ case 2 ... 3:
+ index++;
+ case 0 ... 1:
+ break;
+ }
+
+ td->io_u_lat[index]++;
+}
+
struct io_u *__get_io_u(struct thread_data *td)
{
struct io_u *io_u = NULL;
@@ -367,6 +401,7 @@
add_clat_sample(td, idx, msec);
add_bw_sample(td, idx, &icd->time);
+ io_u_mark_latency(td, msec);
if ((td_rw(td) || td_write(td)) && idx == DDIR_WRITE)
log_io_piece(td, io_u);