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-rw-r--r--docs/tracing.txt9
1 files changed, 8 insertions, 1 deletions
diff --git a/docs/tracing.txt b/docs/tracing.txt
index 95ca16c05d..ea29f2c222 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -132,12 +132,19 @@ This functionality is also provided through monitor commands:
means disabled.
* trace-event NAME on|off
- Enable/disable a given trace event.
+ Enable/disable a given trace event or a group of events having common prefix
+ through wildcard.
The "-trace events=<file>" command line argument can be used to enable the
events listed in <file> from the very beginning of the program. This file must
contain one event name per line.
+A basic wildcard matching is supported in both the monitor command "trace
+-event" and the events list file. That means you can enable/disable the events
+having a common prefix in a batch. For example, virtio-blk trace events could
+be enabled using:
+ trace-event virtio_blk_* on
+
== Trace backends ==
The "tracetool" script automates tedious trace event code generation and also