linux-kernel - Re: [tip:tracing/core] tracing: Document the event tracing system

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Message-ID: <20090412094044.GA6942@lenovo>
Date:	Sun, 12 Apr 2009 13:40:44 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, tglx@...utronix.de, tytso@....edu,
	mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:tracing/core] tracing: Document the event tracing system

[Theodore Ts'o - Sun, Apr 12, 2009 at 09:27:58AM +0000]
| Commit-ID:  1542263998a2d143596972b2776c59c9247578a7
| Gitweb:     http://git.kernel.org/tip/1542263998a2d143596972b2776c59c9247578a7
| Author:     Theodore Ts'o <tytso@....edu>
| AuthorDate: Sat, 11 Apr 2009 15:51:18 -0400
| Committer:  Ingo Molnar <mingo@...e.hu>
| CommitDate: Sun, 12 Apr 2009 11:23:48 +0200
| 
| tracing: Document the event tracing system
| 
| Signed-off-by: "Theodore Ts'o" <tytso@....edu>
| Cc: Theodore Ts'o <tytso@....edu>
| Cc: Steven Rostedt <rostedt@...dmis.org>
| LKML-Reference: <1239479479-2603-3-git-send-email-tytso@....edu>
| Signed-off-by: Ingo Molnar <mingo@...e.hu>
| 
| 
| ---
|  Documentation/trace/events.txt |  132 ++++++++++++++++++++++++++++++++++++++++
|  1 files changed, 132 insertions(+), 0 deletions(-)
| 
...
| +The events which are available for tracing can be found in the file
| +/sys/kernel/debug/tracing/available_events.
| +
| +To enable a particular event, such as 'sched_wakeup', simply echo it to
| +/sys/debug/tracing/set_event.  For example:
| +
| +	# echo sched_wakeup > /sys/kernel/debug/tracing/set_event
| +
| +To disable an event, echo the event name to the set_event file prefixed
| +with an exclamation point:
| +
| +	# echo '!sched_wakeup' >> /sys/kernel//debug/tracing/set_event
					    ^^^
Since it's just being added and easy to fix (later maybe via trivial tree),
I suppose here is quite a small misprint :)

| +
| +To disable events, echo an empty line to the set_event file:
| +
| +	# echo > /sys/kernel/debug/tracing/set_event
| +
...

        Cyrill
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