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authorArjan van de Ven <arjan@linux.intel.com>2009-09-17 10:11:28 -0400
committerIngo Molnar <mingo@elte.hu>2009-09-19 05:42:12 -0400
commit6161352142d5fed4cd753b32e5ccde66e705b14e (patch)
treed64d0e3e6c44440181ddb5d1bc6884067fee0749 /Documentation/trace
parentfd39e055c4fefa4553efc9030f9903afdc6ee323 (diff)
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/trace')
-rw-r--r--Documentation/trace/power.txt17
1 files changed, 0 insertions, 17 deletions
diff --git a/Documentation/trace/power.txt b/Documentation/trace/power.txt
deleted file mode 100644
index cd805e16dc2..00000000000
--- a/Documentation/trace/power.txt
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@@ -1,17 +0,0 @@
1The power tracer collects detailed information about C-state and P-state
2transitions, instead of just looking at the high-level "average"
3information.
4
5There is a helper script found in scrips/tracing/power.pl in the kernel
6sources which can be used to parse this information and create a
7Scalable Vector Graphics (SVG) picture from the trace data.
8
9To 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