[PATCH] IO completion time histograms

[fio.git] / io_u.c

diff --git a/io_u.c b/io_u.c
index c56ccc6c614b32737d829aa7b170513affce6bce..132d8970b36d811cace110d7a927820e4b3a5542 100644 (file)
--- a/io_u.c
+++ b/io_u.c
@@ -263,6 +263,40 @@ static void io_u_mark_depth(struct thread_data *td)
        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 @@ void io_completed(struct thread_data *td, struct io_u *io_u,
 
                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);