sysfs-profiling

 1What:		/sys/kernel/profiling
 2Date:		September 2008
 3Contact:	Dave Hansen <dave@linux.vnet.ibm.com>
 4Description:
 5		/sys/kernel/profiling 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/profiling
11
12		as you would by issuing profile=2 on the boot
13		command line.