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| author | Arjan van de Ven <arjan@linux.intel.com> | 2009-09-17 16:11:28 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-19 11:42:12 +0200 |
| commit | 6161352142d5fed4cd753b32e5ccde66e705b14e (patch) | |
| tree | d64d0e3e6c44440181ddb5d1bc6884067fee0749 /Documentation | |
| parent | fd39e055c4fefa4553efc9030f9903afdc6ee323 (diff) | |
| download | lwn-6161352142d5fed4cd753b32e5ccde66e705b14e.tar.gz lwn-6161352142d5fed4cd753b32e5ccde66e705b14e.zip | |
tracing, perf: Convert the power tracer into an event tracer
This patch converts the existing power tracer into an event tracer,
so that power events (C states and frequency changes) can be
tracked via "perf".
This also removes the perl script that was used to demo the tracer;
its functionality is being replaced entirely with timechart.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20090912130542.6d314860@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/trace/power.txt | 17 |
1 files changed, 0 insertions, 17 deletions
diff --git a/Documentation/trace/power.txt b/Documentation/trace/power.txt deleted file mode 100644 index cd805e16dc27..000000000000 --- a/Documentation/trace/power.txt +++ /dev/null @@ -1,17 +0,0 @@ -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 |