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kern: avoid constexpr init for many objects (avoids unnecessary memory clear) (#1668)

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SciresM 2021-10-23 15:25:20 -07:00 • committed by GitHub
parent 20716cb3de
commit 36e4914be8
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77 changed files with 489 additions and 339 deletions
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73
mesosphere/kernel/source/kern_kernel_instantiations.cpp
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@ -19,7 +19,7 @@ namespace ams::kern {
/* Declare kernel data members in kernel TU. */
constinit Kernel::State Kernel::s_state = Kernel::State::Invalid;
constinit KResourceLimit Kernel::s_system_resource_limit;
constinit KResourceLimit Kernel::s_system_resource_limit{util::ConstantInitialize};
KMemoryManager Kernel::s_memory_manager;
constinit KSupervisorPageTable Kernel::s_supervisor_page_table;
constinit KUnsafeMemory Kernel::s_unsafe_memory;
@ -33,8 +33,8 @@ namespace ams::kern {
constinit KMemoryBlockSlabHeap Kernel::s_app_memory_block_heap;
constinit KMemoryBlockSlabHeap Kernel::s_sys_memory_block_heap;
constinit KBlockInfoSlabHeap Kernel::s_block_info_heap;
constinit KPageTableManager Kernel::s_app_page_table_manager;
constinit KPageTableManager Kernel::s_sys_page_table_manager;
constinit KPageTableManager Kernel::s_app_page_table_manager{util::ConstantInitialize};
constinit KPageTableManager Kernel::s_sys_page_table_manager{util::ConstantInitialize};
constinit KMemoryBlockSlabManager Kernel::s_app_memory_block_manager;
constinit KMemoryBlockSlabManager Kernel::s_sys_memory_block_manager;
constinit KBlockInfoManager Kernel::s_app_block_info_manager;
@ -42,11 +42,70 @@ namespace ams::kern {
namespace {
constinit std::array<KThread, cpu::NumCores> g_main_threads;
constinit std::array<KThread, cpu::NumCores> g_idle_threads;
template<size_t N> requires (N > 0)
union KThreadArray {
struct RecursiveHolder {
KThread m_thread;
KThreadArray<N - 1> m_next;
consteval RecursiveHolder() : m_thread{util::ConstantInitialize}, m_next() { /* ... */ }
} m_holder;
KThread m_arr[N];
consteval KThreadArray() : m_holder() { /* ... */ }
};
template<>
union KThreadArray<1>{
struct RecursiveHolder {
KThread m_thread;
consteval RecursiveHolder() : m_thread{util::ConstantInitialize} { /* ... */ }
} m_holder;
KThread m_arr[1];
consteval KThreadArray() : m_holder() { /* ... */ }
};
template<size_t Ix>
consteval bool IsKThreadArrayValid(const KThreadArray<Ix> &v, const KThread *thread) {
if (std::addressof(v.m_holder.m_thread) != thread) {
return false;
}
if constexpr (Ix == 1) {
return true;
} else {
return IsKThreadArrayValid(v.m_holder.m_next, thread + 1);
}
}
template<size_t N>
consteval bool IsKThreadArrayValid() {
const KThreadArray<N> v{};
if (!IsKThreadArrayValid(v, v.m_arr)) {
return false;
}
if constexpr (N == 1) {
return true;
} else {
return IsKThreadArrayValid<N - 1>();
}
}
static_assert(IsKThreadArrayValid<cpu::NumCores>());
constinit KThreadArray<cpu::NumCores> g_main_threads;
constinit KThreadArray<cpu::NumCores> g_idle_threads;
static_assert(sizeof(g_main_threads) == cpu::NumCores * sizeof(KThread));
static_assert(sizeof(g_main_threads.m_holder) == sizeof(g_main_threads.m_arr));
}
KThread &Kernel::GetMainThread(s32 core_id) { return g_main_threads[core_id]; }
KThread &Kernel::GetIdleThread(s32 core_id) { return g_idle_threads[core_id]; }
KThread &Kernel::GetMainThread(s32 core_id) { return g_main_threads.m_arr[core_id]; }
KThread &Kernel::GetIdleThread(s32 core_id) { return g_idle_threads.m_arr[core_id]; }
}