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Kernel: Include the current instruction pointer in profile samples
We were missing the innermost instruction pointer when sampling. This makes the instruction-level profile info a lot cooler! :^)
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c106451daf
commit
b7ff3b5ad1
4 changed files with 7 additions and 6 deletions
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@ -66,11 +66,12 @@ KResult PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2)
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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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//copy_from_user(&ebp, (FlatPtr*)current->get_register_dump_from_stack().ebp);
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FlatPtr eip;
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copy_from_user(&eip, (FlatPtr*)&Thread::current->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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backtrace = Thread::current->raw_backtrace(ebp);
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backtrace = Thread::current->raw_backtrace(ebp, eip);
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}
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event.stack_size = min(sizeof(event.stack) / sizeof(FlatPtr), static_cast<size_t>(backtrace.size()));
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memcpy(event.stack, backtrace.data(), event.stack_size * sizeof(FlatPtr));
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@ -603,7 +603,7 @@ void Scheduler::timer_tick(const RegisterState& regs)
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if (Process::current->is_profiling()) {
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SmapDisabler disabler;
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auto backtrace = Thread::current->raw_backtrace(regs.ebp);
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auto backtrace = Thread::current->raw_backtrace(regs.ebp, regs.eip);
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auto& sample = Profiling::next_sample_slot();
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sample.pid = Process::current->pid();
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sample.tid = Thread::current->tid();
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@ -846,13 +846,13 @@ String Thread::backtrace_impl() const
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return builder.to_string();
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}
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Vector<FlatPtr> Thread::raw_backtrace(FlatPtr ebp) const
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Vector<FlatPtr> Thread::raw_backtrace(FlatPtr ebp, FlatPtr eip) const
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{
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InterruptDisabler disabler;
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auto& process = const_cast<Process&>(this->process());
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ProcessPagingScope paging_scope(process);
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Vector<FlatPtr, Profiling::max_stack_frame_count> backtrace;
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backtrace.append(ebp);
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backtrace.append(eip);
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for (FlatPtr* stack_ptr = (FlatPtr*)ebp; process.validate_read_from_kernel(VirtualAddress(stack_ptr), sizeof(FlatPtr) * 2) && MM.can_read_without_faulting(process, VirtualAddress(stack_ptr), sizeof(FlatPtr) * 2); stack_ptr = (FlatPtr*)*stack_ptr) {
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FlatPtr retaddr = stack_ptr[1];
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backtrace.append(retaddr);
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@ -97,7 +97,7 @@ public:
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const Process& process() const { return m_process; }
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String backtrace(ProcessInspectionHandle&) const;
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Vector<FlatPtr> raw_backtrace(FlatPtr ebp) const;
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Vector<FlatPtr> raw_backtrace(FlatPtr ebp, FlatPtr eip) const;
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const String& name() const { return m_name; }
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void set_name(const StringView& s) { m_name = s; }
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