sysperfana/perfinvestigator/com.nokia.carbide.cpp.pi.doc.user/html/reference/methods/cpu_timer.htm
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<h3>CPU Timer</h3>
<p> If available, free CPU timers can be
used to calculate time spent within activities whose performance
Related references is required. For example, in OMAP1510/ARM925T
architecture, there are three freely usable CPU timers that can
count with frequencies up to the CPU main clock frequency, therefore
accurately recording temporal activities.
The disadvantage in using CPU timers in performance measurements
is that in most cases the timers have already been employed
by other activities. Through investigation of those activities it
is still possible to use the CPU timers in harmony with them, but with certain limitations.</p>
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