Subject: request to add trace off and trace on with events
From: Steven Rostedt <rostedt@goodmis.org>
Reply-To: rostedt@goodmis.org
To: Tom Zanussi <tzanussi@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, Frederic Weisbecker <fweisbec@gmail.com>,
       Thomas Gleixner <tglx@linutronix.de>,
       Chase Douglas <chase.douglas@canonical.com>,
       LKML <linux-kernel@vger.kernel.org>
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Organization: Kihon Technologies Inc.
Date: Mon, 19 Apr 2010 16:04:04 -0400
Message-ID: <1271707444.10448.12.camel@gandalf.stny.rr.com>
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Hi Tom,

Could you add a way to do a call to tracing_on() or tracing_off() via
the filters. I would like to do something like:


echo 'if (pid == 1234) traceoff' > events/sched/sched_wakeup/filter

Where, if the sched_wakeup event is hit with pid == 1234 it will turn
tracing off.

I would also like to do just:

echo 'traceoff' > events/sched/sched_wakeup/filter

to disable tracing every time the event is hit.

Perhaps you can just add a call back where the kernel could register
something to be called if a command is used in the filter.

register_event_command("traceoff", trace_off_cb);

where the trace_off_cb is a function that is called by the event if the
traceoff command is hit. This would allow other commands to be added
later.

Would something like this be doable, I was looking at the code, and it
certain looks feasible, but it would take me longer to implement it than
it would you :-)

Thanks,

-- Steve


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