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tracing: Add function probe triggers to enable/disable events
Add triggers to function tracer that lets an event get enabled or disabled when a function is called: format is: <function>:enable_event:<system>:<event>[:<count>] <function>:disable_event:<system>:<event>[:<count>] echo 'schedule:enable_event:sched:sched_switch' > /debug/tracing/set_ftrace_filter Every time schedule is called, it will enable the sched_switch event. echo 'schedule:disable_event:sched:sched_switch:2' > /debug/tracing/set_ftrace_filter The first two times schedule is called while the sched_switch event is enabled, it will disable it. It will not count for a time that the event is already disabled (or enabled for enable_event). [ fixed return without mutex_unlock() - thanks to Dan Carpenter and smatch ] Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Steven Rostedt (Red Hat)
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Mar 15, 2013
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