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| author | Arjan van de Ven <arjan@infradead.org> | 2008-11-23 19:49:58 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-26 02:29:32 -0500 |
| commit | f3f47a6768a29448866da4422b6f6bee485c947f (patch) | |
| tree | ba4bf1b79cbd13412871eec50250294d7140fd09 /arch/x86/kernel/aperture_64.c | |
| parent | 509dceef6470442d8c7b8a43ec34125205840b3c (diff) | |
tracing: add "power-tracer": C/P state tracer to help power optimization
Impact: new "power-tracer" ftrace plugin
This patch adds a C/P-state ftrace plugin that will generate
detailed statistics about the C/P-states that are being used,
so that we can look at detailed decisions that the C/P-state
code is making, rather than the too high level "average"
that we have today.
An example way of using this is:
mount -t debugfs none /sys/kernel/debug
echo cstate > /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/trace/cstate.pl > out.svg
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/aperture_64.c')
0 files changed, 0 insertions, 0 deletions