tegrakernel/kernel/kernel-4.9/tools/testing/selftests/ftrace/test.d/functions

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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
}