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[Qemu-devel] [RFC PATCH] Update documentation for LTTng ust tracing
From: |
Mohamad Gebai |
Subject: |
[Qemu-devel] [RFC PATCH] Update documentation for LTTng ust tracing |
Date: |
Mon, 14 Oct 2013 13:03:50 -0400 |
Signed-off-by: Mohamad Gebai <address@hidden>
---
docs/tracing.txt | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/docs/tracing.txt b/docs/tracing.txt
index bfc261b..cbb3aaf 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -214,6 +214,37 @@ The "ust" backend uses the LTTng Userspace Tracer library.
There are no
monitor commands built into QEMU, instead UST utilities should be used to list,
enable/disable, and dump traces.
+Package lttng-tools is required for userspace tracing. After running Qemu,
LTTng
+should be able to list all available events:
+
+ lttng list -u
+
+Create tracing session:
+
+ lttng create mysession
+
+Enable events:
+
+ lttng enable-event EVENTS -u
+
+Where "EVENTS" is either a comma-separated list of events, or "-a" to enable
+all tracepoint events. Start and stop tracing as needed:
+
+ lttng start
+ lttng stop
+
+View the trace:
+
+ lttng view
+
+Destroy tracing session:
+
+ lttng destroy
+
+Babeltrace can be used at any later time to view the trace:
+
+ babeltrace $HOME/lttng-traces/mysession-<date>-<time>
+
=== SystemTap ===
The "dtrace" backend uses DTrace sdt probes but has only been tested with
--
1.7.10.4
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