Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6

[linux-block.git] / Documentation / trace / events.txt

diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
index f157d7594ea7c2bdf991b25f84b5580acec505e3..2bcc8d4dea29ff0cf77a9caf3e77838fe0534cd7 100644 (file)
--- a/Documentation/trace/events.txt
+++ b/Documentation/trace/events.txt
@@ -83,6 +83,15 @@ When reading one of these enable files, there are four results:
  X - there is a mixture of events enabled and disabled
  ? - this file does not affect any event
 
+2.3 Boot option
+---------------
+
+In order to facilitate early boot debugging, use boot option:
+
+       trace_event=[event-list]
+
+The format of this boot option is the same as described in section 2.1.
+
 3. Defining an event-enabled tracepoint
 =======================================