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| author | Ingo Molnar <mingo@elte.hu> | 2009-06-11 17:55:42 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-11 17:55:42 +0200 |
| commit | 940010c5a314a7bd9b498593bc6ba1718ac5aec5 (patch) | |
| tree | d141e08ced08c40c6a8e3ab2cdecde5ff14e560f /Documentation/trace/power.txt | |
| parent | 8dc8e5e8bc0ce00b0f656bf972f67cd8a72759e5 (diff) | |
| parent | 991ec02cdca33b03a132a0cacfe6f0aa0be9aa8d (diff) | |
| download | kernel-crypto-940010c5a314a7bd9b498593bc6ba1718ac5aec5.tar.gz kernel-crypto-940010c5a314a7bd9b498593bc6ba1718ac5aec5.tar.xz kernel-crypto-940010c5a314a7bd9b498593bc6ba1718ac5aec5.zip | |
Merge branch 'linus' into perfcounters/core
Conflicts:
arch/x86/kernel/irqinit.c
arch/x86/kernel/irqinit_64.c
arch/x86/kernel/traps.c
arch/x86/mm/fault.c
include/linux/sched.h
kernel/exit.c
Diffstat (limited to 'Documentation/trace/power.txt')
| -rw-r--r-- | Documentation/trace/power.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/trace/power.txt b/Documentation/trace/power.txt new file mode 100644 index 00000000000..cd805e16dc2 --- /dev/null +++ b/Documentation/trace/power.txt @@ -0,0 +1,17 @@ +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 |