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Date: Sat, 11 Apr 2009 15:51:19 -0400 From: Theodore Ts'o <tytso@....edu> To: Linux Kernel Developers List <linux-kernel@...r.kernel.org> Cc: Theodore Ts'o <tytso@....edu>, Frederic Weisbecker <fweisbec@...il.com>, Steven Rostedt <srostedt@...hat.com> Subject: [PATCH, RFC 3/3] tracing: Add documentation for the power tracer Signed-off-by: "Theodore Ts'o" <tytso@....edu> Cc: Frederic Weisbecker <fweisbec@...il.com> Cc: Steven Rostedt <srostedt@...hat.com> --- Documentation/power.txt | 19 +++++++++++++++++++ 1 files changed, 19 insertions(+), 0 deletions(-) create mode 100644 Documentation/power.txt diff --git a/Documentation/power.txt b/Documentation/power.txt new file mode 100644 index 0000000..16f95c9 --- /dev/null +++ b/Documentation/power.txt @@ -0,0 +1,19 @@ +The power trace 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 + + -- 1.5.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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