linux/Documentation/ABI/testing/sysfs-profiling

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