26 Nov, 2008

1 commit

• f3f47a676   tracing: add "power-tracer": C/P state tracer to help power optimization ... Browse Code »

  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
  Signed-off-by: Ingo Molnar

  Arjan van de Ven

  2008-11-26 15:29:32 +0800