From a5f7c793e30115c77a1d0c4f66f5dd407b4e3ed6 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sun, 13 Jun 2021 10:28:23 -0600
Subject: [PATCH] add a new "Run Loop" timing stats for ALSA and JACK backends

---
 libs/ardour/ardour/audio_backend.h      | 9 +++++----
 libs/backends/alsa/alsa_audiobackend.cc | 2 ++
 libs/backends/jack/jack_audiobackend.cc | 1 +
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/libs/ardour/ardour/audio_backend.h b/libs/ardour/ardour/audio_backend.h
index 551a70a31f..1f9498400d 100644
--- a/libs/ardour/ardour/audio_backend.h
+++ b/libs/ardour/ardour/audio_backend.h
@@ -851,11 +851,12 @@ public:
 
 	enum TimingTypes {
 		DeviceWait = 0,
-		PreProcess = 1,
-		ProcessCallback = 2,
-		PostProcess = 3,
+		PreProcess,
+		ProcessCallback,
+		PostProcess,
+		RunLoop,
 		/* end */
-		NTT = 4
+		NTT
 	};
 
 	PBD::TimingStats dsp_stats[NTT];
diff --git a/libs/backends/alsa/alsa_audiobackend.cc b/libs/backends/alsa/alsa_audiobackend.cc
index e5987d99b2..a7090371e3 100644
--- a/libs/backends/alsa/alsa_audiobackend.cc
+++ b/libs/backends/alsa/alsa_audiobackend.cc
@@ -1855,6 +1855,7 @@ AlsaAudioBackend::main_process_thread ()
 			dsp_stats[DeviceWait].start();
 			nr = _pcmi->pcm_wait ();
 			dsp_stats[DeviceWait].update();
+			dsp_stats[RunLoop].start ();
 
 			/* update DLL */
 			dsp_stats[PreProcess].start();
@@ -2021,6 +2022,7 @@ AlsaAudioBackend::main_process_thread ()
 				++last_n_periods;
 
 				dsp_stats[PostProcess].update ();
+				dsp_stats[RunLoop].update ();
 			}
 
 			if (xrun && (_pcmi->capt_xrun () > 0 || _pcmi->play_xrun () > 0)) {
diff --git a/libs/backends/jack/jack_audiobackend.cc b/libs/backends/jack/jack_audiobackend.cc
index 3d6bc2b150..0bc79e5549 100644
--- a/libs/backends/jack/jack_audiobackend.cc
+++ b/libs/backends/jack/jack_audiobackend.cc
@@ -977,6 +977,7 @@ JACKAudioBackend::process_thread ()
         AudioEngine::thread_init_callback (this);
 
         while (1) {
+                TimerRAII ltr (dsp_stats[RunLoop]);
                 GET_PRIVATE_JACK_POINTER_RET(_priv_jack,0);
 
                 dsp_stats[AudioBackend::DeviceWait].start ();