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-rw-r--r--docs/tracing.txt13
1 files changed, 4 insertions, 9 deletions
diff --git a/docs/tracing.txt b/docs/tracing.txt
index c541133368..453cc4a63d 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -139,6 +139,10 @@ having a common prefix in a batch. For example, virtio-blk trace events could
be enabled using:
trace-event virtio_blk_* on
+If a line in the "-trace events=<file>" file begins with a '-', the trace event
+will be disabled instead of enabled. This is useful when a wildcard was used
+to enable an entire family of events but one noisy event needs to be disabled.
+
== Trace backends ==
The "tracetool" script automates tedious trace event code generation and also
@@ -185,15 +189,6 @@ records the char* pointer value instead of the string that is pointed to.
==== Monitor commands ====
-* info trace
- Display the contents of trace buffer. This command dumps the trace buffer
- with simple formatting. For full pretty-printing, use the simpletrace.py
- script on a binary trace file.
-
- The trace buffer is written into until full. The full trace buffer is
- flushed and emptied. This means the 'info trace' will display few or no
- entries if the buffer has just been flushed.
-
* trace-file on|off|flush|set <path>
Enable/disable/flush the trace file or set the trace file name.