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Kernel+Profiler: Track lost time between profiler timer ticks

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We can lose profiling timer events for a few reasons, for example
disabled interrupts or system slowness. This accounts for lost
time between CPU samples by adding a field lost_samples to each
profiling event which tracks how many samples were lost immediately
preceding the event.
This commit is contained in:
Gunnar Beutner 2021-05-13 22:14:07 +02:00 • committed by Andreas Kling
commit c41f13f10b
Notes: sideshowbarker 2024-07-18 18:11:50 +09:00
8 changed files with 30 additions and 11 deletions
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2
Userland/DevTools/Profiler/TimelineTrack.cpp
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@ -78,7 +78,7 @@ void TimelineTrack::paint_event(GUI::PaintEvent& event)
}
auto& histogram = event.in_kernel ? kernel_histogram : usermode_histogram;
histogram.insert(clamp_timestamp(event.timestamp), 1);
histogram.insert(clamp_timestamp(event.timestamp), 1 + event.lost_samples);
}
decltype(kernel_histogram.at(0)) max_value = 0;