56c4995174
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <srostedt@redhat.com> LKML-Reference: <1239479479-2603-4-git-send-email-tytso@mit.edu> Signed-off-by: Ingo Molnar <mingo@elte.hu>
18 lines
673 B
Text
18 lines
673 B
Text
The power tracer collects detailed information about C-state and P-state
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transitions, instead of just looking at the high-level "average"
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information.
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There is a helper script found in scrips/tracing/power.pl in the kernel
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sources which can be used to parse this information and create a
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Scalable Vector Graphics (SVG) picture from the trace data.
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To use this tracer:
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echo 0 > /sys/kernel/debug/tracing/tracing_enabled
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echo power > /sys/kernel/debug/tracing/current_tracer
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echo 1 > /sys/kernel/debug/tracing/tracing_enabled
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sleep 1
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echo 0 > /sys/kernel/debug/tracing/tracing_enabled
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cat /sys/kernel/debug/tracing/trace | \
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perl scripts/tracing/power.pl > out.sv
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