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kernel: fix single-core preemption points
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parent
21945ae127
commit
da07e13e07
6 changed files with 27 additions and 39 deletions
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@ -144,39 +144,25 @@ void CpuManager::SingleCoreRunIdleThread() {
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}
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void CpuManager::PreemptSingleCore(bool from_running_environment) {
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{
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auto& kernel = system.Kernel();
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auto& scheduler = kernel.Scheduler(current_core);
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auto& kernel = system.Kernel();
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Kernel::KThread* current_thread = scheduler.GetSchedulerCurrentThread();
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if (idle_count >= 4 || from_running_environment) {
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if (!from_running_environment) {
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system.CoreTiming().Idle();
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idle_count = 0;
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}
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kernel.SetIsPhantomModeForSingleCore(true);
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system.CoreTiming().Advance();
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kernel.SetIsPhantomModeForSingleCore(false);
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if (idle_count >= 4 || from_running_environment) {
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if (!from_running_environment) {
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system.CoreTiming().Idle();
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idle_count = 0;
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}
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current_core.store((current_core + 1) % Core::Hardware::NUM_CPU_CORES);
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system.CoreTiming().ResetTicks();
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scheduler.Unload(scheduler.GetSchedulerCurrentThread());
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auto& next_scheduler = kernel.Scheduler(current_core);
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// Disable dispatch. We're about to preempt this thread.
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Kernel::KScopedDisableDispatch dd{kernel};
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Common::Fiber::YieldTo(current_thread->GetHostContext(), *next_scheduler.GetSwitchFiber());
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kernel.SetIsPhantomModeForSingleCore(true);
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system.CoreTiming().Advance();
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kernel.SetIsPhantomModeForSingleCore(false);
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}
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current_core.store((current_core + 1) % Core::Hardware::NUM_CPU_CORES);
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system.CoreTiming().ResetTicks();
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kernel.Scheduler(current_core).PreemptSingleCore();
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// We've now been scheduled again, and we may have exchanged schedulers.
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// Reload the scheduler in case it's different.
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{
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auto& scheduler = system.Kernel().Scheduler(current_core);
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scheduler.Reload(scheduler.GetSchedulerCurrentThread());
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if (!scheduler.IsIdle()) {
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idle_count = 0;
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}
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if (!kernel.Scheduler(current_core).IsIdle()) {
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idle_count = 0;
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}
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}
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@ -5,7 +5,6 @@
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#include <array>
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#include <atomic>
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#include <csetjmp>
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#include <functional>
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#include <memory>
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#include <thread>
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@ -103,7 +103,20 @@ void KScheduler::ScheduleOnInterrupt() {
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GetCurrentThread(kernel).EnableDispatch();
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}
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void KScheduler::PreemptSingleCore() {
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GetCurrentThread(kernel).DisableDispatch();
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auto* thread = GetCurrentThreadPointer(kernel);
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auto& previous_scheduler = kernel.Scheduler(thread->GetCurrentCore());
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previous_scheduler.Unload(thread);
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Common::Fiber::YieldTo(thread->GetHostContext(), *m_switch_fiber);
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GetCurrentThread(kernel).EnableDispatch();
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}
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void KScheduler::RescheduleCurrentCore() {
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ASSERT(!kernel.IsPhantomModeForSingleCore());
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ASSERT(GetCurrentThread(kernel).GetDisableDispatchCount() == 1);
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GetCurrentThread(kernel).EnableDispatch();
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@ -49,6 +49,7 @@ public:
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void SetInterruptTaskRunnable();
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void RequestScheduleOnInterrupt();
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void PreemptSingleCore();
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u64 GetIdleCount() {
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return m_state.idle_count;
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@ -62,10 +63,6 @@ public:
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return m_current_thread.load() == m_idle_thread;
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}
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std::shared_ptr<Common::Fiber> GetSwitchFiber() {
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return m_switch_fiber;
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}
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KThread* GetPreviousThread() const {
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return m_state.prev_thread;
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}
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@ -1204,12 +1204,6 @@ KScopedDisableDispatch::~KScopedDisableDispatch() {
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return;
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}
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// Skip the reschedule if single-core.
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if (!Settings::values.use_multi_core.GetValue()) {
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GetCurrentThread(kernel).EnableDispatch();
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return;
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}
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if (GetCurrentThread(kernel).GetDisableDispatchCount() <= 1) {
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auto scheduler = kernel.CurrentScheduler();
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@ -110,7 +110,6 @@ void SetCurrentThread(KernelCore& kernel, KThread* thread);
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[[nodiscard]] KThread* GetCurrentThreadPointer(KernelCore& kernel);
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[[nodiscard]] KThread& GetCurrentThread(KernelCore& kernel);
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[[nodiscard]] s32 GetCurrentCoreId(KernelCore& kernel);
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size_t CaptureBacktrace(void** buffer, size_t max);
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class KThread final : public KAutoObjectWithSlabHeapAndContainer<KThread, KWorkerTask>,
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public boost::intrusive::list_base_hook<> {
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