From 4c76ff503fbf3fb4b95b186ed96834192421f1f4 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sat, 12 Jun 2021 14:49:07 -0600
Subject: [PATCH] measure backend process callback duration in ALSA backend

---
 libs/backends/alsa/alsa_audiobackend.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libs/backends/alsa/alsa_audiobackend.cc b/libs/backends/alsa/alsa_audiobackend.cc
index 407c7f716a..e5987d99b2 100644
--- a/libs/backends/alsa/alsa_audiobackend.cc
+++ b/libs/backends/alsa/alsa_audiobackend.cc
@@ -1961,11 +1961,13 @@ AlsaAudioBackend::main_process_thread ()
 				/* call engine process callback */
 				_last_process_start = g_get_monotonic_time ();
 				dsp_stats[PreProcess].update();
+				dsp_stats[ProcessCallback].start();
 				if (engine.process_callback (_samples_per_period)) {
 					_pcmi->pcm_stop ();
 					_active = false;
 					return 0;
 				}
+				dsp_stats[ProcessCallback].update();
 				dsp_stats[PostProcess].start ();
 
 				/* only used when adding/removing MIDI device/system ports */