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CPU_Manager: Unload/Reload threads on preemption on SingleCore

This commit is contained in:
Fernando Sahmkow 2020-03-10 11:50:33 -04:00
parent 8a78fc2580
commit a439cdf22e
4 changed files with 64 additions and 7 deletions

View file

@ -225,7 +225,7 @@ void CpuManager::SingleCoreRunGuestLoop() {
}
physical_core.ClearExclusive();
PreemptSingleCore();
auto& scheduler = physical_core.Scheduler();
auto& scheduler = kernel.Scheduler(current_core);
scheduler.TryDoContextSwitch();
}
}
@ -260,11 +260,15 @@ void CpuManager::SingleCoreRunSuspendThread() {
void CpuManager::PreemptSingleCore() {
preemption_count = 0;
std::size_t old_core = current_core;
current_core = (current_core + 1) % Core::Hardware::NUM_CPU_CORES;
current_core.store((current_core + 1) % Core::Hardware::NUM_CPU_CORES);
auto& scheduler = system.Kernel().Scheduler(old_core);
Kernel::Thread* current_thread = system.Kernel().Scheduler(old_core).GetCurrentThread();
Kernel::Thread* next_thread = system.Kernel().Scheduler(current_core).GetCurrentThread();
Common::Fiber::YieldTo(current_thread->GetHostContext(), next_thread->GetHostContext());
Kernel::Thread* current_thread = scheduler.GetCurrentThread();
scheduler.Unload();
auto& next_scheduler = system.Kernel().Scheduler(current_core);
Common::Fiber::YieldTo(current_thread->GetHostContext(), next_scheduler.ControlContext());
/// May have changed scheduler
auto& current_scheduler = system.Kernel().Scheduler(current_core);
current_scheduler.Reload();
}
void CpuManager::SingleCorePause(bool paused) {

View file

@ -5,6 +5,7 @@
#pragma once
#include <array>
#include <atomic>
#include <functional>
#include <memory>
#include <thread>
@ -45,7 +46,7 @@ public:
void* GetStartFuncParamater();
std::size_t CurrentCore() const {
return current_core;
return current_core.load();
}
private:
@ -88,7 +89,7 @@ private:
std::array<CoreData, Core::Hardware::NUM_CPU_CORES> core_data{};
bool is_multicore{};
std::size_t current_core{};
std::atomic<std::size_t> current_core{};
std::size_t preemption_count{};
static constexpr std::size_t max_cycle_runs = 5;

View file

@ -602,6 +602,48 @@ void Scheduler::OnThreadStart() {
SwitchContextStep2();
}
void Scheduler::Unload() {
Thread* thread = current_thread.get();
if (thread) {
thread->last_running_ticks = system.CoreTiming().GetCPUTicks();
thread->SetIsRunning(false);
if (!thread->IsHLEThread()) {
auto& cpu_core = system.ArmInterface(core_id);
cpu_core.SaveContext(thread->GetContext32());
cpu_core.SaveContext(thread->GetContext64());
// Save the TPIDR_EL0 system register in case it was modified.
thread->SetTPIDR_EL0(cpu_core.GetTPIDR_EL0());
cpu_core.ClearExclusiveState();
}
thread->context_guard.unlock();
}
}
void Scheduler::Reload() {
Thread* thread = current_thread.get();
if (thread) {
ASSERT_MSG(thread->GetSchedulingStatus() == ThreadSchedStatus::Runnable,
"Thread must be runnable.");
// Cancel any outstanding wakeup events for this thread
thread->SetIsRunning(true);
thread->last_running_ticks = system.CoreTiming().GetCPUTicks();
auto* const thread_owner_process = thread->GetOwnerProcess();
if (thread_owner_process != nullptr) {
system.Kernel().MakeCurrentProcess(thread_owner_process);
}
if (!thread->IsHLEThread()) {
auto& cpu_core = system.ArmInterface(core_id);
cpu_core.LoadContext(thread->GetContext32());
cpu_core.LoadContext(thread->GetContext64());
cpu_core.SetTlsAddress(thread->GetTLSAddress());
cpu_core.SetTPIDR_EL0(thread->GetTPIDR_EL0());
cpu_core.ClearExclusiveState();
}
}
}
void Scheduler::SwitchContextStep2() {
Thread* previous_thread = current_thread_prev.get();
Thread* new_thread = selected_thread.get();

View file

@ -210,6 +210,12 @@ public:
/// Reschedules to the next available thread (call after current thread is suspended)
void TryDoContextSwitch();
/// The next two are for SingleCore Only.
/// Unload current thread before preempting core.
void Unload();
/// Reload current thread after core preemption.
void Reload();
/// Gets the current running thread
Thread* GetCurrentThread() const;
@ -230,6 +236,10 @@ public:
void OnThreadStart();
std::shared_ptr<Common::Fiber> ControlContext() {
return switch_fiber;
}
private:
friend class GlobalScheduler;