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Kernel: Prune uninteresting kernel frames from profiling samples
Start capturing the sample stacks at the EIP/EBP of the pre-empted thread instead of capturing EBP in the sampling function itself.
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parent
bf0719092f
commit
647cfcb641
3 changed files with 12 additions and 5 deletions
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@ -39,6 +39,16 @@ PerformanceEventBuffer::PerformanceEventBuffer()
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}
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KResult PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2)
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{
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FlatPtr ebp;
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asm volatile("movl %%ebp, %%eax"
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: "=a"(ebp));
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auto current_thread = Thread::current();
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auto eip = current_thread->get_register_dump_from_stack().eip;
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return append_with_eip_and_ebp(eip, ebp, type, arg1, arg2);
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}
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KResult PerformanceEventBuffer::append_with_eip_and_ebp(u32 eip, u32 ebp, int type, FlatPtr arg1, FlatPtr arg2)
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{
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if (count() >= capacity())
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return KResult(-ENOBUFS);
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@ -60,11 +70,7 @@ KResult PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2)
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return KResult(-EINVAL);
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}
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FlatPtr ebp;
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asm volatile("movl %%ebp, %%eax"
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: "=a"(ebp));
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auto current_thread = Thread::current();
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auto eip = current_thread->get_register_dump_from_stack().eip;
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Vector<FlatPtr> backtrace;
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{
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SmapDisabler disabler;
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