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| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-07-01 04:47:05 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-07-01 15:44:24 +0200 |
| commit | 020e5f85cb087a40572c8b8b2dd06292a14fa212 (patch) | |
| tree | d1bd09885693dd9d5e9db995cb0f7f58aa0e1bb8 /Documentation/trace/events.txt | |
| parent | kprobes: Clean up insn_pages by using list instead of hlist (diff) | |
| download | linux-020e5f85cb087a40572c8b8b2dd06292a14fa212.tar.xz linux-020e5f85cb087a40572c8b8b2dd06292a14fa212.zip | |
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.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt index f157d7594ea7..2bcc8d4dea29 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 ======================================= |