Documentation/trace/power.txt

   1 The power tracer collects detailed information about C-state and P-state
   2 transitions, instead of just looking at the high-level "average"
   3 information.
   4
   5 There is a helper script found in scrips/tracing/power.pl in the kernel
   6 sources which can be used to parse this information and create a
   7 Scalable Vector Graphics (SVG) picture from the trace data.
   8
   9 To use this tracer:
  10
  11         echo 0 > /sys/kernel/debug/tracing/tracing_enabled
  12         echo power > /sys/kernel/debug/tracing/current_tracer
  13         echo 1 > /sys/kernel/debug/tracing/tracing_enabled
  14         sleep 1
  15         echo 0 > /sys/kernel/debug/tracing/tracing_enabled
  16         cat /sys/kernel/debug/tracing/trace | \
  17                 perl scripts/tracing/power.pl > out.sv