| Theodore Ts'o | 56c4995 | 2009-04-11 15:51:19 -0400 | [diff] [blame] | 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 |