The x86 kernel supports tracing most MSR (Model Specific Register) accesses.
  To see the definition of the MSRs on Intel systems please see the SDM
  at http://www.intel.com/sdm (Volume 3)
  
  Available trace points:
  
  /sys/kernel/debug/tracing/events/msr/
  
  Trace MSR reads
  
  read_msr
  
  msr: MSR number
  val: Value written
  failed: 1 if the access failed, otherwise 0
  
  
  Trace MSR writes
  
  write_msr
  
  msr: MSR number
  val: Value written
  failed: 1 if the access failed, otherwise 0
  
  
  Trace RDPMC in kernel
  
  rdpmc
  
  The trace data can be post processed with the postprocess/decode_msr.py script
  
  cat /sys/kernel/debug/tracing/trace | decode_msr.py /usr/src/linux/include/asm/msr-index.h
  
  to add symbolic MSR names.