request to add trace off and trace on with events
From: Steven Rostedt
Date: Mon Apr 19 2010 - 16:04:26 EST
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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