rt-tests: hwlatdetect: Improve message if max latency is below threshold

Improve message if max latency is below threshold.

If the maximum latency is below the threshold for reporting, 0us is output.
This is confusing, and not accurate, so print the message "Below threshold"
instead.

Suggested-by: Jiri Kastner <jkastner@redhat.com>
Signed-off-by: John Kacur <jkacur@redhat.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/src/hwlatdetect/hwlatdetect.py b/src/hwlatdetect/hwlatdetect.py
index d9ef027..4a01434 100755
--- a/src/hwlatdetect/hwlatdetect.py
+++ b/src/hwlatdetect/hwlatdetect.py
@@ -568,9 +568,15 @@ if __name__ == '__main__':
 
     info("test finished")
 
-    exceeding = detect.get("count")
-    info("Max Latency: %dus" % detect.get("max"))
+    max_latency = detect.get("max")
+    if max_latency == 0:
+        info("Max Latency: Below threshold")
+    else:
+        info("Max Latency: %dus" % max_latency)
+
     info("Samples recorded: %d" % len(detect.samples))
+
+    exceeding = detect.get("count")
     info("Samples exceeding threshold: %d" % exceeding)
 
     if detect.have_msr: