mirror of
https://github.com/justinian/jsix.git
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a03804b09d
Added profiler.h which defines classes and macros for defining profiler objects. Also added gdb command j6prof for printing profile data. Added the syscall_profiles profiler class and auto wrapping of syscalls with profile objects. Other changes in this commit: - Made the gdb command `j6threads` argument for specifying a CPU optional. Without an argument, it loops through all CPUs. - Switched to -mcmodel=kernel for kernel code, which makes `call` instructions easier to follow when debugging / looking at disassembly.
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
#pragma once
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/// \file profiler.h
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/// The kernel profiling interface
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#include <stdint.h>
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#include <util/hash.h>
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inline uint64_t rdtsc() {
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uint32_t high, low;
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asm ( "rdtsc" : "=a" (low), "=d" (high) );
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return (static_cast<uint64_t>(high) << 32) | low;
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}
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template<typename PC, size_t ID>
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class profiler
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{
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using class_t = PC;
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static constexpr size_t id = ID;
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public:
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profiler(char const * const function = __builtin_FUNCTION()) : m_start(rdtsc()) {
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static_assert(id < class_t::count, "profiler out of bounds");
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class_t::call_counts[id]++;
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class_t::function_names[id] = function;
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}
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~profiler() {
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uint64_t stop = rdtsc();
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class_t::call_durations[id] += (stop - m_start);
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}
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private:
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uint64_t m_start;
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};
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template<typename T>
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struct profile_class
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{
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static volatile char const * function_names[];
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static volatile uint64_t call_counts[];
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static volatile uint64_t call_durations[];
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};
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#define DECLARE_PROFILE_CLASS(name, size) \
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struct name : public profile_class<name> { static constexpr size_t count = size; };
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#define DEFINE_PROFILE_CLASS(name) \
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template<> volatile char const * profile_class<name>::function_names[name::count] = {0}; \
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template<> volatile uint64_t profile_class<name>::call_counts[name::count] = {0}; \
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template<> volatile uint64_t profile_class<name>::call_durations[name::count] = {0};
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