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+What:           /sys/kernel/profile
+Date:           September 2008
+Contact:        Dave Hansen <dave@linux.vnet.ibm.com>
+Description:
+                /sys/kernel/profile is the runtime equivalent
+                of the boot-time profile= option.
+
+                You can get the same effect running:
+
+                        echo 2 > /sys/kernel/profile
+
+                as you would by issuing profile=2 on the boot
+                command line.