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