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kern/util: use custom atomics wrapper to substantially improve codegen

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This commit is contained in:
Michael Scire
2021-10-19 15:24:15 -07:00
parent 52332e8d75
commit d74f364107
26 changed files with 688 additions and 260 deletions
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10
libraries/libmesosphere/source/kern_k_scheduler.cpp
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@@ -246,9 +246,9 @@ namespace ams::kern {
if (cur_process != nullptr) {
/* NOTE: Combining this into AMS_LIKELY(!... && ...) triggers an internal compiler error: Segmentation fault in GCC 9.2.0. */
if (AMS_LIKELY(!cur_thread->IsTerminationRequested()) && AMS_LIKELY(cur_thread->GetActiveCore() == m_core_id)) {
m_state.prev_thread = cur_thread;
m_state.prev_thread.Store<std::memory_order_relaxed>(cur_thread);
} else {
m_state.prev_thread = nullptr;
m_state.prev_thread.Store<std::memory_order_relaxed>(nullptr);
}
}
@@ -270,13 +270,9 @@ namespace ams::kern {
void KScheduler::ClearPreviousThread(KThread *thread) {
MESOSPHERE_ASSERT(IsSchedulerLockedByCurrentThread());
for (size_t i = 0; i < cpu::NumCores; ++i) {
/* Get an atomic reference to the core scheduler's previous thread. */
std::atomic_ref<KThread *> prev_thread(Kernel::GetScheduler(static_cast<s32>(i)).m_state.prev_thread);
static_assert(std::atomic_ref<KThread *>::is_always_lock_free);
/* Atomically clear the previous thread if it's our target. */
KThread *compare = thread;
prev_thread.compare_exchange_strong(compare, nullptr);
Kernel::GetScheduler(static_cast<s32>(i)).m_state.prev_thread.CompareExchangeStrong(compare, nullptr);
}
}