centos man page for function::cpu_clock_ns

FUNCTION::CPU_CLOCK_(3stap)					Timestamp Functions				       FUNCTION::CPU_CLOCK_(3stap)

NAME
       function::cpu_clock_ns - Number of nanoseconds on the given cpu's clock

SYNOPSIS
	   cpu_clock_ns:long(cpu:long)

ARGUMENTS
       cpu
	   Which processor's clock to read

DESCRIPTION
       This function returns the number of nanoseconds on the given cpu's clock. This is always monotonic comparing on the same cpu, but may have
       some drift between cpus (within about a jiffy).

SystemTap Tapset Reference					     June 2014					       FUNCTION::CPU_CLOCK_(3stap)