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Kernel: Prune uninteresting kernel frames from profiling samples

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Start capturing the sample stacks at the EIP/EBP of the pre-empted
thread instead of capturing EBP in the sampling function itself.
This commit is contained in:
Andreas Kling 2021-01-17 10:53:18 +01:00
parent bf0719092f
commit 647cfcb641
3 changed files with 12 additions and 5 deletions
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2
Kernel/Scheduler.cpp
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@ -495,7 +495,7 @@ void Scheduler::timer_tick(const RegisterState& regs)
if (current_thread->process().is_profiling()) {
ASSERT(current_thread->process().perf_events());
auto& perf_events = *current_thread->process().perf_events();
[[maybe_unused]] auto rc = perf_events.append(PERF_EVENT_SAMPLE, 0, 0);
[[maybe_unused]] auto rc = perf_events.append_with_eip_and_ebp(regs.eip, regs.ebp, PERF_EVENT_SAMPLE, 0, 0);
}
if (current_thread->tick((regs.cs & 3) == 0))