Chapter 4 - DSpace at Waseda University

5.5.1.2 Result of SL
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Chapter 5
In SL, it reads the latency_start_end value, which is the location information saved in DL,
and its event log in same time. After that, it separates data of latency from whole event log.
Figure 5.10: Result of Separation Layer
Figure 5.10 shows the result of SL. It separates every event occurred from
smp_apic_timer_interrupt_entry to smp_apic_timer_interrupt_exit, which shows entry and
exit of HRTimer interrupt.
5.5.1.3 Result of AL
AL is the last layer of KAS and it finds statistics information about every delay occurred in
HRTimer. Statistic information is outputted in every period and it is possible to trace latency
by using the statistic information.