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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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1
Userland/DevTools/Profiler/Profile.cpp
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@ -228,6 +228,7 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
Event event;
event.timestamp = perf_event.get("timestamp").to_number<u64>();
event.lost_samples = perf_event.get("lost_samples").to_number<u32>();
event.type = perf_event.get("type").to_string();
event.pid = perf_event.get("pid").to_i32();
event.tid = perf_event.get("tid").to_i32();