Chapter 4 - DSpace at Waseda University
Chapter 4 - DSpace at Waseda University
Chapter 4 - DSpace at Waseda University
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5.5.1.2 Result of SL<br />
67<br />
<strong>Chapter</strong> 5<br />
In SL, it reads the l<strong>at</strong>ency_start_end value, which is the loc<strong>at</strong>ion inform<strong>at</strong>ion saved in DL,<br />
and its event log in same time. After th<strong>at</strong>, it separ<strong>at</strong>es d<strong>at</strong>a of l<strong>at</strong>ency from whole event log.<br />
Figure 5.10: Result of Separ<strong>at</strong>ion Layer<br />
Figure 5.10 shows the result of SL. It separ<strong>at</strong>es every event occurred from<br />
smp_apic_timer_interrupt_entry to smp_apic_timer_interrupt_exit, which shows entry and<br />
exit of HRTimer interrupt.<br />
5.5.1.3 Result of AL<br />
AL is the last layer of KAS and it finds st<strong>at</strong>istics inform<strong>at</strong>ion about every delay occurred in<br />
HRTimer. St<strong>at</strong>istic inform<strong>at</strong>ion is outputted in every period and it is possible to trace l<strong>at</strong>ency<br />
by using the st<strong>at</strong>istic inform<strong>at</strong>ion.