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   1 What:           /sys/kernel/profile
   2 Date:           September 2008
   3 Contact:        Dave Hansen <dave@linux.vnet.ibm.com>
   4 Description:
   5                 /sys/kernel/profile is the runtime equivalent
   6                 of the boot-time profile= option.
   7
   8                 You can get the same effect running:
   9
  10                         echo 2 > /sys/kernel/profile
  11
  12                 as you would by issuing profile=2 on the boot
  13                 command line.