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authorLi Zefan <lizf@cn.fujitsu.com>2009-07-01 10:47:05 +0800
committerIngo Molnar <mingo@elte.hu>2009-07-01 15:44:24 +0200
commit020e5f85cb087a40572c8b8b2dd06292a14fa212 (patch)
treed1bd09885693dd9d5e9db995cb0f7f58aa0e1bb8 /Documentation/trace/events.txt
parentc5cb5a2d8d7dc872cf1504091ad0e59fe5ff7cb5 (diff)
downloadlinux-2.6.38-lt-ux500-020e5f85cb087a40572c8b8b2dd06292a14fa212.tar.gz
tracing/events: Add trace_event boot option
We already have ftrace= boot option, and this adds a similar boot option for trace events, so allow trace events to be enabled at boot, for boot debugging purpose. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A4ACE29.3010407@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/trace/events.txt')
-rw-r--r--Documentation/trace/events.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
index f157d7594ea..2bcc8d4dea2 100644
--- 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
=======================================