Ftrace from Google

ftrace-cmd.txt

************function_graph******************
********************************************
echo 0 > /sys/kernel/debug/tracing/tracing_on
trace-cmd start -p function_graph -g ip_rcv
trace-cmd stop
cat /sys/kernel/debug/tracing/trace

********************************************
cat tracing_on 
echo 1 > tracing_on 
echo function > current_tracer 
echo nop > current_tracer 
cat trace
echo function > current_tracer 
cat trace
cat trace > /home/jagannath/Desktop/trace.txt
echo function > current_tracer 
echo 0 > tracing_on 
cat trace
echo nop > current_tracer 
echo 'Hello world!' > trace_marker
echo 'Hello world' > trace_marker
echo "Hello world" > trace_marker
echo 1 > tracing_on 
echo 'hello world!' > trace_marker