stats: Add hint information to per priority level stats

Modify the json and standard per-priority output stats to display the
hint value together with the priority class and level.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Niklas Cassel <niklas.cassel@wdc.com>
Link: https://lore.kernel.org/r/20230721110510.44772-7-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

stat.c

@@ -597,10 +597,11 @@ static void show_ddir_status(struct group_run_stats *rs, struct thread_stat *ts,
  continue;
 
  snprintf(buf, sizeof(buf),
- "%s prio %u/%u",
+ "%s prio %u/%u/%u",
  clat_type,
  ioprio_class(ts->clat_prio[ddir][i].ioprio),
- ioprio(ts->clat_prio[ddir][i].ioprio));
+ ioprio(ts->clat_prio[ddir][i].ioprio),
+ ioprio_hint(ts->clat_prio[ddir][i].ioprio));
  display_lat(buf, min, max, mean, dev, out);
  }
  }
@@ -640,10 +641,11 @@ static void show_ddir_status(struct group_run_stats *rs, struct thread_stat *ts,
  continue;
 
  snprintf(prio_name, sizeof(prio_name),
- "%s prio %u/%u (%.2f%% of IOs)",
+ "%s prio %u/%u/%u (%.2f%% of IOs)",
  clat_type,
  ioprio_class(ts->clat_prio[ddir][i].ioprio),
  ioprio(ts->clat_prio[ddir][i].ioprio),
+ ioprio_hint(ts->clat_prio[ddir][i].ioprio),
  100. * (double) prio_samples / (double) samples);
  show_clat_percentiles(ts->clat_prio[ddir][i].io_u_plat,
  prio_samples, ts->percentile_list,
@@ -1533,6 +1535,8 @@ static void add_ddir_status_json(struct thread_stat *ts,
  ioprio_class(ts->clat_prio[ddir][i].ioprio));
  json_object_add_value_int(obj, "prio",
  ioprio(ts->clat_prio[ddir][i].ioprio));
+ json_object_add_value_int(obj, "priohint",
+ ioprio_hint(ts->clat_prio[ddir][i].ioprio));
 
  tmp_object = add_ddir_lat_json(ts,
  ts->clat_percentiles | ts->lat_percentiles,