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clear_trace() { # reset trace output
echo > trace
}
disable_tracing() { # stop trace recording
echo 0 > tracing_on
}
enable_tracing() { # start trace recording
echo 1 > tracing_on
}
reset_tracer() { # reset the current tracer
echo nop > current_tracer
}
reset_trigger() { # reset all current setting triggers
grep -v ^# events/*/*/trigger |
while read line; do
cmd=`echo $line | cut -f2- -d: | cut -f1 -d" "`
echo "!$cmd" > `echo $line | cut -f1 -d:`
done
}
reset_events_filter() { # reset all current setting filters
grep -v ^none events/*/*/filter |
while read line; do
echo 0 > `echo $line | cut -f1 -d:`
done
}
reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
echo > set_ftrace_filter
grep -v '^#' set_ftrace_filter | while read t; do
tr=`echo $t | cut -d: -f2`
if [ "$tr" == "" ]; then
continue
fi
if [ $tr == "enable_event" -o $tr == "disable_event" ]; then
tr=`echo $t | cut -d: -f1-4`
limit=`echo $t | cut -d: -f5`
else
tr=`echo $t | cut -d: -f1-2`
limit=`echo $t | cut -d: -f3`
fi
if [ "$limit" != "unlimited" ]; then
tr="$tr:$limit"
fi
echo "!$tr" > set_ftrace_filter
done
}
disable_events() {
echo 0 > events/enable
}
initialize_ftrace() { # Reset ftrace to initial-state
# As the initial state, ftrace will be set to nop tracer,
# no events, no triggers, no filters, no function filters,
# no probes, and tracing on.
disable_tracing
reset_tracer
reset_trigger
reset_events_filter
disable_events
echo > set_event_pid # event tracer is always on
[ -f set_ftrace_filter ] && echo | tee set_ftrace_*
[ -f set_graph_function ] && echo | tee set_graph_*
[ -f stack_trace_filter ] && echo > stack_trace_filter
[ -f kprobe_events ] && echo > kprobe_events
[ -f uprobe_events ] && echo > uprobe_events
enable_tracing
}
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