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hle: kernel: Rewrite scheduler implementation based on Mesopshere.

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This commit is contained in:
bunnei 2020-12-02 18:08:35 -08:00
parent c10a37e5b6
commit 9e29e36a78
26 changed files with 1217 additions and 1225 deletions
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4
src/core/CMakeLists.txt
View file

@ -154,6 +154,8 @@ add_library(core STATIC
hle/kernel/hle_ipc.h
hle/kernel/k_affinity_mask.h
hle/kernel/k_priority_queue.h
hle/kernel/k_scheduler.cpp
hle/kernel/k_scheduler.h
hle/kernel/k_scheduler_lock.h
hle/kernel/kernel.cpp
hle/kernel/kernel.h
@ -189,8 +191,6 @@ add_library(core STATIC
hle/kernel/readable_event.h
hle/kernel/resource_limit.cpp
hle/kernel/resource_limit.h
hle/kernel/scheduler.cpp
hle/kernel/scheduler.h
hle/kernel/server_port.cpp
hle/kernel/server_port.h
hle/kernel/server_session.cpp

2
src/core/arm/dynarmic/arm_dynarmic_64.cpp
View file

@ -15,8 +15,8 @@
#include "core/core.h"
#include "core/core_timing.h"
#include "core/hardware_properties.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/svc.h"
#include "core/memory.h"
#include "core/settings.h"

28
src/core/core.cpp
View file

@ -27,10 +27,10 @@
#include "core/file_sys/vfs_real.h"
#include "core/hardware_interrupt_manager.h"
#include "core/hle/kernel/client_port.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/physical_core.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/service/am/applets/applets.h"
#include "core/hle/service/apm/controller.h"
@ -508,14 +508,6 @@ std::size_t System::CurrentCoreIndex() const {
return core;
}
Kernel::Scheduler& System::CurrentScheduler() {
return impl->kernel.CurrentScheduler();
}
const Kernel::Scheduler& System::CurrentScheduler() const {
return impl->kernel.CurrentScheduler();
}
Kernel::PhysicalCore& System::CurrentPhysicalCore() {
return impl->kernel.CurrentPhysicalCore();
}
@ -524,22 +516,14 @@ const Kernel::PhysicalCore& System::CurrentPhysicalCore() const {
return impl->kernel.CurrentPhysicalCore();
}
Kernel::Scheduler& System::Scheduler(std::size_t core_index) {
return impl->kernel.Scheduler(core_index);
}
const Kernel::Scheduler& System::Scheduler(std::size_t core_index) const {
return impl->kernel.Scheduler(core_index);
/// Gets the global scheduler
Kernel::GlobalSchedulerContext& System::GlobalSchedulerContext() {
return impl->kernel.GlobalSchedulerContext();
}
/// Gets the global scheduler
Kernel::GlobalScheduler& System::GlobalScheduler() {
return impl->kernel.GlobalScheduler();
}
/// Gets the global scheduler
const Kernel::GlobalScheduler& System::GlobalScheduler() const {
return impl->kernel.GlobalScheduler();
const Kernel::GlobalSchedulerContext& System::GlobalSchedulerContext() const {
return impl->kernel.GlobalSchedulerContext();
}
Kernel::Process* System::CurrentProcess() {

22
src/core/core.h
View file

@ -26,11 +26,11 @@ class VfsFilesystem;
} // namespace FileSys
namespace Kernel {
class GlobalScheduler;
class GlobalSchedulerContext;
class KernelCore;
class PhysicalCore;
class Process;
class Scheduler;
class KScheduler;
} // namespace Kernel
namespace Loader {
@ -213,12 +213,6 @@ public:
/// Gets the index of the currently running CPU core
[[nodiscard]] std::size_t CurrentCoreIndex() const;
/// Gets the scheduler for the CPU core that is currently running
[[nodiscard]] Kernel::Scheduler& CurrentScheduler();
/// Gets the scheduler for the CPU core that is currently running
[[nodiscard]] const Kernel::Scheduler& CurrentScheduler() const;
/// Gets the physical core for the CPU core that is currently running
[[nodiscard]] Kernel::PhysicalCore& CurrentPhysicalCore();
@ -261,17 +255,11 @@ public:
/// Gets an immutable reference to the renderer.
[[nodiscard]] const VideoCore::RendererBase& Renderer() const;
/// Gets the scheduler for the CPU core with the specified index
[[nodiscard]] Kernel::Scheduler& Scheduler(std::size_t core_index);
/// Gets the scheduler for the CPU core with the specified index
[[nodiscard]] const Kernel::Scheduler& Scheduler(std::size_t core_index) const;
/// Gets the global scheduler
[[nodiscard]] Kernel::GlobalSchedulerContext& GlobalSchedulerContext();
/// Gets the global scheduler
[[nodiscard]] Kernel::GlobalScheduler& GlobalScheduler();
/// Gets the global scheduler
[[nodiscard]] const Kernel::GlobalScheduler& GlobalScheduler() const;
[[nodiscard]] const Kernel::GlobalSchedulerContext& GlobalSchedulerContext() const;
/// Gets the manager for the guest device memory
[[nodiscard]] Core::DeviceMemory& DeviceMemory();

55
src/core/cpu_manager.cpp
View file

@ -10,9 +10,9 @@
#include "core/core.h"
#include "core/core_timing.h"
#include "core/cpu_manager.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/physical_core.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "video_core/gpu.h"
@ -109,11 +109,8 @@ void* CpuManager::GetStartFuncParamater() {
void CpuManager::MultiCoreRunGuestThread() {
auto& kernel = system.Kernel();
{
auto& sched = kernel.CurrentScheduler();
sched.OnThreadStart();
}
auto* thread = kernel.CurrentScheduler().GetCurrentThread();
kernel.CurrentScheduler()->OnThreadStart();
auto* thread = kernel.CurrentScheduler()->GetCurrentThread();
auto& host_context = thread->GetHostContext();
host_context->SetRewindPoint(GuestRewindFunction, this);
MultiCoreRunGuestLoop();
@ -130,8 +127,8 @@ void CpuManager::MultiCoreRunGuestLoop() {
physical_core = &kernel.CurrentPhysicalCore();
}
system.ExitDynarmicProfile();
auto& scheduler = kernel.CurrentScheduler();
scheduler.TryDoContextSwitch();
physical_core->ArmInterface().ClearExclusiveState();
kernel.CurrentScheduler()->RescheduleCurrentCore();
}
}
@ -140,25 +137,21 @@ void CpuManager::MultiCoreRunIdleThread() {
while (true) {
auto& physical_core = kernel.CurrentPhysicalCore();
physical_core.Idle();
auto& scheduler = kernel.CurrentScheduler();
scheduler.TryDoContextSwitch();
kernel.CurrentScheduler()->RescheduleCurrentCore();
}
}
void CpuManager::MultiCoreRunSuspendThread() {
auto& kernel = system.Kernel();
{
auto& sched = kernel.CurrentScheduler();
sched.OnThreadStart();
}
kernel.CurrentScheduler()->OnThreadStart();
while (true) {
auto core = kernel.GetCurrentHostThreadID();
auto& scheduler = kernel.CurrentScheduler();
auto& scheduler = *kernel.CurrentScheduler();
Kernel::Thread* current_thread = scheduler.GetCurrentThread();
Common::Fiber::YieldTo(current_thread->GetHostContext(), core_data[core].host_context);
ASSERT(scheduler.ContextSwitchPending());
ASSERT(core == kernel.GetCurrentHostThreadID());
scheduler.TryDoContextSwitch();
scheduler.RescheduleCurrentCore();
}
}
@ -206,11 +199,8 @@ void CpuManager::MultiCorePause(bool paused) {
void CpuManager::SingleCoreRunGuestThread() {
auto& kernel = system.Kernel();
{
auto& sched = kernel.CurrentScheduler();
sched.OnThreadStart();
}
auto* thread = kernel.CurrentScheduler().GetCurrentThread();
kernel.CurrentScheduler()->OnThreadStart();
auto* thread = kernel.CurrentScheduler()->GetCurrentThread();
auto& host_context = thread->GetHostContext();
host_context->SetRewindPoint(GuestRewindFunction, this);
SingleCoreRunGuestLoop();
@ -218,7 +208,7 @@ void CpuManager::SingleCoreRunGuestThread() {
void CpuManager::SingleCoreRunGuestLoop() {
auto& kernel = system.Kernel();
auto* thread = kernel.CurrentScheduler().GetCurrentThread();
auto* thread = kernel.CurrentScheduler()->GetCurrentThread();
while (true) {
auto* physical_core = &kernel.CurrentPhysicalCore();
system.EnterDynarmicProfile();
@ -230,9 +220,10 @@ void CpuManager::SingleCoreRunGuestLoop() {
thread->SetPhantomMode(true);
system.CoreTiming().Advance();
thread->SetPhantomMode(false);
physical_core->ArmInterface().ClearExclusiveState();
PreemptSingleCore();
auto& scheduler = kernel.Scheduler(current_core);
scheduler.TryDoContextSwitch();
scheduler.RescheduleCurrentCore();
}
}
@ -244,24 +235,21 @@ void CpuManager::SingleCoreRunIdleThread() {
system.CoreTiming().AddTicks(1000U);
idle_count++;
auto& scheduler = physical_core.Scheduler();
scheduler.TryDoContextSwitch();
scheduler.RescheduleCurrentCore();
}
}
void CpuManager::SingleCoreRunSuspendThread() {
auto& kernel = system.Kernel();
{
auto& sched = kernel.CurrentScheduler();
sched.OnThreadStart();
}
kernel.CurrentScheduler()->OnThreadStart();
while (true) {
auto core = kernel.GetCurrentHostThreadID();
auto& scheduler = kernel.CurrentScheduler();
auto& scheduler = *kernel.CurrentScheduler();
Kernel::Thread* current_thread = scheduler.GetCurrentThread();
Common::Fiber::YieldTo(current_thread->GetHostContext(), core_data[0].host_context);
ASSERT(scheduler.ContextSwitchPending());
ASSERT(core == kernel.GetCurrentHostThreadID());
scheduler.TryDoContextSwitch();
scheduler.RescheduleCurrentCore();
}
}
@ -280,12 +268,12 @@ void CpuManager::PreemptSingleCore(bool from_running_enviroment) {
}
current_core.store((current_core + 1) % Core::Hardware::NUM_CPU_CORES);
system.CoreTiming().ResetTicks();
scheduler.Unload();
scheduler.Unload(scheduler.GetCurrentThread());
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();
current_scheduler.Reload(scheduler.GetCurrentThread());
auto* currrent_thread2 = current_scheduler.GetCurrentThread();
if (!currrent_thread2->IsIdleThread()) {
idle_count = 0;
@ -369,8 +357,7 @@ void CpuManager::RunThread(std::size_t core) {
return;
}
auto& scheduler = system.Kernel().CurrentScheduler();
Kernel::Thread* current_thread = scheduler.GetCurrentThread();
auto current_thread = system.Kernel().CurrentScheduler()->GetCurrentThread();
data.is_running = true;
Common::Fiber::YieldTo(data.host_context, current_thread->GetHostContext());
data.is_running = false;

6
src/core/hle/kernel/address_arbiter.cpp
View file

@ -12,8 +12,8 @@
#include "core/hle/kernel/address_arbiter.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/kernel/time_manager.h"
#include "core/hle/result.h"
@ -153,7 +153,7 @@ ResultCode AddressArbiter::WaitForAddressIfLessThan(VAddr address, s32 value, s6
bool should_decrement) {
auto& memory = system.Memory();
auto& kernel = system.Kernel();
Thread* current_thread = system.CurrentScheduler().GetCurrentThread();
Thread* current_thread = kernel.CurrentScheduler()->GetCurrentThread();
Handle event_handle = InvalidHandle;
{
@ -223,7 +223,7 @@ ResultCode AddressArbiter::WaitForAddressIfLessThan(VAddr address, s32 value, s6
ResultCode AddressArbiter::WaitForAddressIfEqual(VAddr address, s32 value, s64 timeout) {
auto& memory = system.Memory();
auto& kernel = system.Kernel();
Thread* current_thread = system.CurrentScheduler().GetCurrentThread();
Thread* current_thread = kernel.CurrentScheduler()->GetCurrentThread();
Handle event_handle = InvalidHandle;
{

4
src/core/hle/kernel/handle_table.cpp
View file

@ -8,9 +8,9 @@
#include "core/core.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
@ -105,7 +105,7 @@ bool HandleTable::IsValid(Handle handle) const {
std::shared_ptr<Object> HandleTable::GetGeneric(Handle handle) const {
if (handle == CurrentThread) {
return SharedFrom(kernel.CurrentScheduler().GetCurrentThread());
return SharedFrom(kernel.CurrentScheduler()->GetCurrentThread());
} else if (handle == CurrentProcess) {
return SharedFrom(kernel.CurrentProcess());
}

2
src/core/hle/kernel/hle_ipc.cpp
View file

@ -17,11 +17,11 @@
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/hle_ipc.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/readable_event.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/server_session.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/kernel/time_manager.h"

873
src/core/hle/kernel/k_scheduler.cpp Normal file
View file

@ -0,0 +1,873 @@
// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
// This file references various implementation details from Atmosphere, an open-source firmware for
// the Nintendo Switch. Copyright 2018-2020 Atmosphere-NX.
#include <algorithm>
#include <mutex>
#include <set>
#include <unordered_set>
#include <utility>
#include "common/assert.h"
#include "common/bit_util.h"
#include "common/fiber.h"
#include "common/logging/log.h"
#include "core/arm/arm_interface.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/cpu_manager.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/physical_core.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/kernel/time_manager.h"
namespace Kernel {
static void IncrementScheduledCount(Kernel::Thread* thread) {
if (auto process = thread->GetOwnerProcess(); process) {
process->IncrementScheduledCount();
}
}
GlobalSchedulerContext::GlobalSchedulerContext(KernelCore& kernel)
: kernel{kernel}, scheduler_lock{kernel} {}
GlobalSchedulerContext::~GlobalSchedulerContext() = default;
/*static*/ void KScheduler::RescheduleCores(KernelCore& kernel, u64 cores_pending_reschedule,
Core::EmuThreadHandle global_thread) {
u32 current_core = global_thread.host_handle;
bool must_context_switch = global_thread.guest_handle != InvalidHandle &&
(current_core < Core::Hardware::NUM_CPU_CORES);
while (cores_pending_reschedule != 0) {
u32 core = Common::CountTrailingZeroes64(cores_pending_reschedule);
ASSERT(core < Core::Hardware::NUM_CPU_CORES);
if (!must_context_switch || core != current_core) {
auto& phys_core = kernel.PhysicalCore(core);
phys_core.Interrupt();
} else {
must_context_switch = true;
}
cores_pending_reschedule &= ~(1ULL << core);
}
if (must_context_switch) {
auto core_scheduler = kernel.CurrentScheduler();
kernel.ExitSVCProfile();
core_scheduler->RescheduleCurrentCore();
kernel.EnterSVCProfile();
}
}
u64 KScheduler::UpdateHighestPriorityThread(Thread* highest_thread) {
std::scoped_lock lock{guard};
if (Thread* prev_highest_thread = this->state.highest_priority_thread;
prev_highest_thread != highest_thread) {
if (prev_highest_thread != nullptr) {
IncrementScheduledCount(prev_highest_thread);
prev_highest_thread->SetLastScheduledTick(system.CoreTiming().GetCPUTicks());
}
if (this->state.should_count_idle) {
if (highest_thread != nullptr) {
// if (Process* process = highest_thread->GetOwnerProcess(); process != nullptr) {
// process->SetRunningThread(this->core_id, highest_thread,
// this->state.idle_count);
//}
} else {
this->state.idle_count++;
}
}
this->state.highest_priority_thread = highest_thread;
this->state.needs_scheduling = true;
return (1ULL << this->core_id);
} else {
return 0;
}
}
/*static*/ u64 KScheduler::UpdateHighestPriorityThreadsImpl(KernelCore& kernel) {
ASSERT(kernel.GlobalSchedulerContext().IsLocked());
/* Clear that we need to update. */
ClearSchedulerUpdateNeeded(kernel);
u64 cores_needing_scheduling = 0, idle_cores = 0;
Thread* top_threads[Core::Hardware::NUM_CPU_CORES];
auto& priority_queue = GetPriorityQueue(kernel);
/* We want to go over all cores, finding the highest priority thread and determining if
* scheduling is needed for that core. */
for (size_t core_id = 0; core_id < Core::Hardware::NUM_CPU_CORES; core_id++) {
Thread* top_thread = priority_queue.GetScheduledFront((s32)core_id);
if (top_thread != nullptr) {
///* If the thread has no waiters, we need to check if the process has a thread pinned.
///*/
// if (top_thread->GetNumKernelWaiters() == 0) {
// if (Process* parent = top_thread->GetOwnerProcess(); parent != nullptr) {
// if (Thread* pinned = parent->GetPinnedThread(core_id);
// pinned != nullptr && pinned != top_thread) {
// /* We prefer our parent's pinned thread if possible. However, we also
// don't
// * want to schedule un-runnable threads. */
// if (pinned->GetRawState() == Thread::ThreadState_Runnable) {
// top_thread = pinned;
// } else {
// top_thread = nullptr;
// }
// }
// }
//}
} else {
idle_cores |= (1ULL << core_id);
}
top_threads[core_id] = top_thread;
cores_needing_scheduling |=
kernel.Scheduler(core_id).UpdateHighestPriorityThread(top_threads[core_id]);
}
/* Idle cores are bad. We're going to try to migrate threads to each idle core in turn. */
while (idle_cores != 0) {
u32 core_id = Common::CountTrailingZeroes64(idle_cores);
if (Thread* suggested = priority_queue.GetSuggestedFront(core_id); suggested != nullptr) {
s32 migration_candidates[Core::Hardware::NUM_CPU_CORES];
size_t num_candidates = 0;
/* While we have a suggested thread, try to migrate it! */
while (suggested != nullptr) {
/* Check if the suggested thread is the top thread on its core. */
const s32 suggested_core = suggested->GetActiveCore();
if (Thread* top_thread =
(suggested_core >= 0) ? top_threads[suggested_core] : nullptr;
top_thread != suggested) {
/* Make sure we're not dealing with threads too high priority for migration. */
if (top_thread != nullptr &&
top_thread->GetPriority() < HighestCoreMigrationAllowedPriority) {
break;
}
/* The suggested thread isn't bound to its core, so we can migrate it! */
suggested->SetActiveCore(core_id);
priority_queue.ChangeCore(suggested_core, suggested);
top_threads[core_id] = suggested;
cores_needing_scheduling |=
kernel.Scheduler(core_id).UpdateHighestPriorityThread(top_threads[core_id]);
break;
}
/* Note this core as a candidate for migration. */
ASSERT(num_candidates < Core::Hardware::NUM_CPU_CORES);
migration_candidates[num_candidates++] = suggested_core;
suggested = priority_queue.GetSuggestedNext(core_id, suggested);
}
/* If suggested is nullptr, we failed to migrate a specific thread. So let's try all our
* candidate cores' top threads. */
if (suggested == nullptr) {
for (size_t i = 0; i < num_candidates; i++) {
/* Check if there's some other thread that can run on the candidate core. */
const s32 candidate_core = migration_candidates[i];
suggested = top_threads[candidate_core];
if (Thread* next_on_candidate_core =
priority_queue.GetScheduledNext(candidate_core, suggested);
next_on_candidate_core != nullptr) {
/* The candidate core can run some other thread! We'll migrate its current
* top thread to us. */
top_threads[candidate_core] = next_on_candidate_core;
cores_needing_scheduling |=
kernel.Scheduler(candidate_core)
.UpdateHighestPriorityThread(top_threads[candidate_core]);
/* Perform the migration. */
suggested->SetActiveCore(core_id);
priority_queue.ChangeCore(candidate_core, suggested);
top_threads[core_id] = suggested;
cores_needing_scheduling |=
kernel.Scheduler(core_id).UpdateHighestPriorityThread(
top_threads[core_id]);
break;
}
}
}
}
idle_cores &= ~(1ULL << core_id);
}
return cores_needing_scheduling;
}
void GlobalSchedulerContext::AddThread(std::shared_ptr<Thread> thread) {
std::scoped_lock lock{global_list_guard};
thread_list.push_back(std::move(thread));
}
void GlobalSchedulerContext::RemoveThread(std::shared_ptr<Thread> thread) {
std::scoped_lock lock{global_list_guard};
thread_list.erase(std::remove(thread_list.begin(), thread_list.end(), thread),
thread_list.end());
}
void GlobalSchedulerContext::PreemptThreads() {
// The priority levels at which the global scheduler preempts threads every 10 ms. They are
// ordered from Core 0 to Core 3.
std::array<u32, Core::Hardware::NUM_CPU_CORES> preemption_priorities = {59, 59, 59, 63};
ASSERT(IsLocked());
for (u32 core_id = 0; core_id < Core::Hardware::NUM_CPU_CORES; core_id++) {
const u32 priority = preemption_priorities[core_id];
kernel.Scheduler(core_id).RotateScheduledQueue(core_id, priority);
}
}
bool GlobalSchedulerContext::IsLocked() const {
return scheduler_lock.IsLockedByCurrentThread();
}
/*static*/ void KScheduler::OnThreadStateChanged(KernelCore& kernel, Thread* thread,
u32 old_state) {
ASSERT(kernel.GlobalSchedulerContext().IsLocked());
/* Check if the state has changed, because if it hasn't there's nothing to do. */
const auto cur_state = thread->scheduling_state;
if (cur_state == old_state) {
return;
}
/* Update the priority queues. */
if (old_state == static_cast<u32>(ThreadSchedStatus::Runnable)) {
/* If we were previously runnable, then we're not runnable now, and we should remove. */
GetPriorityQueue(kernel).Remove(thread);
IncrementScheduledCount(thread);
SetSchedulerUpdateNeeded(kernel);
} else if (cur_state == static_cast<u32>(ThreadSchedStatus::Runnable)) {
/* If we're now runnable, then we weren't previously, and we should add. */
GetPriorityQueue(kernel).PushBack(thread);
IncrementScheduledCount(thread);
SetSchedulerUpdateNeeded(kernel);
}
}
/*static*/ void KScheduler::OnThreadPriorityChanged(KernelCore& kernel, Thread* thread,
Thread* current_thread, u32 old_priority) {
ASSERT(kernel.GlobalSchedulerContext().IsLocked());
/* If the thread is runnable, we want to change its priority in the queue. */
if (thread->scheduling_state == static_cast<u32>(ThreadSchedStatus::Runnable)) {
GetPriorityQueue(kernel).ChangePriority(
old_priority, thread == kernel.CurrentScheduler()->GetCurrentThread(), thread);
IncrementScheduledCount(thread);
SetSchedulerUpdateNeeded(kernel);
}
}
/*static*/ void KScheduler::OnThreadAffinityMaskChanged(KernelCore& kernel, Thread* thread,
const KAffinityMask& old_affinity,
s32 old_core) {
ASSERT(kernel.GlobalSchedulerContext().IsLocked());
/* If the thread is runnable, we want to change its affinity in the queue. */
if (thread->scheduling_state == static_cast<u32>(ThreadSchedStatus::Runnable)) {
GetPriorityQueue(kernel).ChangeAffinityMask(old_core, old_affinity, thread);
IncrementScheduledCount(thread);
SetSchedulerUpdateNeeded(kernel);
}
}
void KScheduler::RotateScheduledQueue(s32 core_id, s32 priority) {
ASSERT(system.GlobalSchedulerContext().IsLocked());
/* Get a reference to the priority queue. */
auto& kernel = system.Kernel();
auto& priority_queue = GetPriorityQueue(kernel);
/* Rotate the front of the queue to the end. */
Thread* top_thread = priority_queue.GetScheduledFront(core_id, priority);
Thread* next_thread = nullptr;
if (top_thread != nullptr) {
next_thread = priority_queue.MoveToScheduledBack(top_thread);
if (next_thread != top_thread) {
IncrementScheduledCount(top_thread);
IncrementScheduledCount(next_thread);
}
}
/* While we have a suggested thread, try to migrate it! */
{
Thread* suggested = priority_queue.GetSuggestedFront(core_id, priority);
while (suggested != nullptr) {
/* Check if the suggested thread is the top thread on its core. */
const s32 suggested_core = suggested->GetActiveCore();
if (Thread* top_on_suggested_core =
(suggested_core >= 0) ? priority_queue.GetScheduledFront(suggested_core)
: nullptr;
top_on_suggested_core != suggested) {
/* If the next thread is a new thread that has been waiting longer than our
* suggestion, we prefer it to our suggestion. */
if (top_thread != next_thread && next_thread != nullptr &&
next_thread->GetLastScheduledTick() < suggested->GetLastScheduledTick()) {
suggested = nullptr;
break;
}
/* If we're allowed to do a migration, do one. */
/* NOTE: Unlike migrations in UpdateHighestPriorityThread, this moves the suggestion
* to the front of the queue. */
if (top_on_suggested_core == nullptr ||
top_on_suggested_core->GetPriority() >= HighestCoreMigrationAllowedPriority) {
suggested->SetActiveCore(core_id);
priority_queue.ChangeCore(suggested_core, suggested, true);
IncrementScheduledCount(suggested);
break;
}
}
/* Get the next suggestion. */
suggested = priority_queue.GetSamePriorityNext(core_id, suggested);
}
}
/* Now that we might have migrated a thread with the same priority, check if we can do better.
*/
{
Thread* best_thread = priority_queue.GetScheduledFront(core_id);
if (best_thread == GetCurrentThread()) {
best_thread = priority_queue.GetScheduledNext(core_id, best_thread);
}
/* If the best thread we can choose has a priority the same or worse than ours, try to
* migrate a higher priority thread. */
if (best_thread != nullptr && best_thread->GetPriority() >= static_cast<u32>(priority)) {
Thread* suggested = priority_queue.GetSuggestedFront(core_id);
while (suggested != nullptr) {
/* If the suggestion's priority is the same as ours, don't bother. */
if (suggested->GetPriority() >= best_thread->GetPriority()) {
break;
}
/* Check if the suggested thread is the top thread on its core. */
const s32 suggested_core = suggested->GetActiveCore();
if (Thread* top_on_suggested_core =
(suggested_core >= 0) ? priority_queue.GetScheduledFront(suggested_core)
: nullptr;
top_on_suggested_core != suggested) {
/* If we're allowed to do a migration, do one. */
/* NOTE: Unlike migrations in UpdateHighestPriorityThread, this moves the
* suggestion to the front of the queue. */
if (top_on_suggested_core == nullptr ||
top_on_suggested_core->GetPriority() >=
HighestCoreMigrationAllowedPriority) {
suggested->SetActiveCore(core_id);
priority_queue.ChangeCore(suggested_core, suggested, true);
IncrementScheduledCount(suggested);
break;
}
}
/* Get the next suggestion. */
suggested = priority_queue.GetSuggestedNext(core_id, suggested);
}
}
}
/* After a rotation, we need a scheduler update. */
SetSchedulerUpdateNeeded(kernel);
}
/*static*/ bool KScheduler::CanSchedule(KernelCore& kernel) {
return kernel.CurrentScheduler()->GetCurrentThread()->GetDisableDispatchCount() <= 1;
}
/*static*/ bool KScheduler::IsSchedulerUpdateNeeded(const KernelCore& kernel) {
return kernel.GlobalSchedulerContext().scheduler_update_needed.load(std::memory_order_acquire);
}
/*static*/ void KScheduler::SetSchedulerUpdateNeeded(KernelCore& kernel) {
kernel.GlobalSchedulerContext().scheduler_update_needed.store(true, std::memory_order_release);
}
/*static*/ void KScheduler::ClearSchedulerUpdateNeeded(KernelCore& kernel) {
kernel.GlobalSchedulerContext().scheduler_update_needed.store(false, std::memory_order_release);
}
/*static*/ void KScheduler::DisableScheduling(KernelCore& kernel) {
if (auto* scheduler = kernel.CurrentScheduler(); scheduler) {
ASSERT(scheduler->GetCurrentThread()->GetDisableDispatchCount() >= 0);
scheduler->GetCurrentThread()->DisableDispatch();
}
}
/*static*/ void KScheduler::EnableScheduling(KernelCore& kernel, u64 cores_needing_scheduling,
Core::EmuThreadHandle global_thread) {
if (auto* scheduler = kernel.CurrentScheduler(); scheduler) {
scheduler->GetCurrentThread()->EnableDispatch();
}
RescheduleCores(kernel, cores_needing_scheduling, global_thread);
}
/*static*/ u64 KScheduler::UpdateHighestPriorityThreads(KernelCore& kernel) {
if (IsSchedulerUpdateNeeded(kernel)) {
return UpdateHighestPriorityThreadsImpl(kernel);
} else {
return 0;
}
}
/*static*/ KSchedulerPriorityQueue& KScheduler::GetPriorityQueue(KernelCore& kernel) {
return kernel.GlobalSchedulerContext().priority_queue;
}
void KScheduler::YieldWithoutCoreMigration() {
auto& kernel = system.Kernel();
/* Validate preconditions. */
ASSERT(CanSchedule(kernel));
ASSERT(kernel.CurrentProcess() != nullptr);
/* Get the current thread and process. */
Thread& cur_thread = *GetCurrentThread();
Process& cur_process = *kernel.CurrentProcess();
/* If the thread's yield count matches, there's nothing for us to do. */
if (cur_thread.GetYieldScheduleCount() == cur_process.GetScheduledCount()) {
return;
}
/* Get a reference to the priority queue. */
auto& priority_queue = GetPriorityQueue(kernel);
/* Perform the yield. */
{
SchedulerLock lock(kernel);
const auto cur_state = cur_thread.scheduling_state;
if (cur_state == static_cast<u32>(ThreadSchedStatus::Runnable)) {
/* Put the current thread at the back of the queue. */
Thread* next_thread = priority_queue.MoveToScheduledBack(std::addressof(cur_thread));
IncrementScheduledCount(std::addressof(cur_thread));
/* If the next thread is different, we have an update to perform. */
if (next_thread != std::addressof(cur_thread)) {
SetSchedulerUpdateNeeded(kernel);
} else {
/* Otherwise, set the thread's yield count so that we won't waste work until the
* process is scheduled again. */
cur_thread.SetYieldScheduleCount(cur_process.GetScheduledCount());
}
}
}
}
void KScheduler::YieldWithCoreMigration() {
auto& kernel = system.Kernel();
/* Validate preconditions. */
ASSERT(CanSchedule(kernel));
ASSERT(kernel.CurrentProcess() != nullptr);
/* Get the current thread and process. */
Thread& cur_thread = *GetCurrentThread();
Process& cur_process = *kernel.CurrentProcess();
/* If the thread's yield count matches, there's nothing for us to do. */
if (cur_thread.GetYieldScheduleCount() == cur_process.GetScheduledCount()) {
return;
}
/* Get a reference to the priority queue. */
auto& priority_queue = GetPriorityQueue(kernel);
/* Perform the yield. */
{
SchedulerLock lock(kernel);
const auto cur_state = cur_thread.scheduling_state;
if (cur_state == static_cast<u32>(ThreadSchedStatus::Runnable)) {
/* Get the current active core. */
const s32 core_id = cur_thread.GetActiveCore();
/* Put the current thread at the back of the queue. */
Thread* next_thread = priority_queue.MoveToScheduledBack(std::addressof(cur_thread));
IncrementScheduledCount(std::addressof(cur_thread));
/* While we have a suggested thread, try to migrate it! */
bool recheck = false;
Thread* suggested = priority_queue.GetSuggestedFront(core_id);
while (suggested != nullptr) {
/* Check if the suggested thread is the thread running on its core. */
const s32 suggested_core = suggested->GetActiveCore();
if (Thread* running_on_suggested_core =
(suggested_core >= 0)
? kernel.Scheduler(suggested_core).state.highest_priority_thread
: nullptr;
running_on_suggested_core != suggested) {
/* If the current thread's priority is higher than our suggestion's we prefer
* the next thread to the suggestion. */
/* We also prefer the next thread when the current thread's priority is equal to
* the suggestions, but the next thread has been waiting longer. */
if ((suggested->GetPriority() > cur_thread.GetPriority()) ||
(suggested->GetPriority() == cur_thread.GetPriority() &&
next_thread != std::addressof(cur_thread) &&
next_thread->GetLastScheduledTick() < suggested->GetLastScheduledTick())) {
suggested = nullptr;
break;
}
/* If we're allowed to do a migration, do one. */
/* NOTE: Unlike migrations in UpdateHighestPriorityThread, this moves the
* suggestion to the front of the queue. */
if (running_on_suggested_core == nullptr ||
running_on_suggested_core->GetPriority() >=
HighestCoreMigrationAllowedPriority) {
suggested->SetActiveCore(core_id);
priority_queue.ChangeCore(suggested_core, suggested, true);
IncrementScheduledCount(suggested);
break;
} else {
/* We couldn't perform a migration, but we should check again on a future
* yield. */
recheck = true;
}
}
/* Get the next suggestion. */
suggested = priority_queue.GetSuggestedNext(core_id, suggested);
}
/* If we still have a suggestion or the next thread is different, we have an update to
* perform. */
if (suggested != nullptr || next_thread != std::addressof(cur_thread)) {
SetSchedulerUpdateNeeded(kernel);
} else if (!recheck) {
/* Otherwise if we don't need to re-check, set the thread's yield count so that we
* won't waste work until the process is scheduled again. */
cur_thread.SetYieldScheduleCount(cur_process.GetScheduledCount());
}
}
}
}
void KScheduler::YieldToAnyThread() {
auto& kernel = system.Kernel();
/* Validate preconditions. */
ASSERT(CanSchedule(kernel));
ASSERT(kernel.CurrentProcess() != nullptr);
/* Get the current thread and process. */
Thread& cur_thread = *GetCurrentThread();
Process& cur_process = *kernel.CurrentProcess();
/* If the thread's yield count matches, there's nothing for us to do. */
if (cur_thread.GetYieldScheduleCount() == cur_process.GetScheduledCount()) {
return;
}
/* Get a reference to the priority queue. */
auto& priority_queue = GetPriorityQueue(kernel);
/* Perform the yield. */
{
SchedulerLock lock(kernel);
const auto cur_state = cur_thread.scheduling_state;
if (cur_state == static_cast<u32>(ThreadSchedStatus::Runnable)) {
/* Get the current active core. */
const s32 core_id = cur_thread.GetActiveCore();
/* Migrate the current thread to core -1. */
cur_thread.SetActiveCore(-1);
priority_queue.ChangeCore(core_id, std::addressof(cur_thread));
IncrementScheduledCount(std::addressof(cur_thread));
/* If there's nothing scheduled, we can try to perform a migration. */
if (priority_queue.GetScheduledFront(core_id) == nullptr) {
/* While we have a suggested thread, try to migrate it! */
Thread* suggested = priority_queue.GetSuggestedFront(core_id);
while (suggested != nullptr) {
/* Check if the suggested thread is the top thread on its core. */
const s32 suggested_core = suggested->GetActiveCore();
if (Thread* top_on_suggested_core =
(suggested_core >= 0) ? priority_queue.GetScheduledFront(suggested_core)
: nullptr;
top_on_suggested_core != suggested) {
/* If we're allowed to do a migration, do one. */
if (top_on_suggested_core == nullptr ||
top_on_suggested_core->GetPriority() >=
HighestCoreMigrationAllowedPriority) {
suggested->SetActiveCore(core_id);
priority_queue.ChangeCore(suggested_core, suggested);
IncrementScheduledCount(suggested);
}
/* Regardless of whether we migrated, we had a candidate, so we're done. */
break;
}
/* Get the next suggestion. */
suggested = priority_queue.GetSuggestedNext(core_id, suggested);
}
/* If the suggestion is different from the current thread, we need to perform an
* update. */
if (suggested != std::addressof(cur_thread)) {
SetSchedulerUpdateNeeded(kernel);
} else {
/* Otherwise, set the thread's yield count so that we won't waste work until the
* process is scheduled again. */
cur_thread.SetYieldScheduleCount(cur_process.GetScheduledCount());
}
} else {
/* Otherwise, we have an update to perform. */
SetSchedulerUpdateNeeded(kernel);
}
}
}
}
void GlobalSchedulerContext::Lock() {
scheduler_lock.Lock();
}
void GlobalSchedulerContext::Unlock() {
scheduler_lock.Unlock();
}
KScheduler::KScheduler(Core::System& system, std::size_t core_id)
: system(system), core_id(core_id) {
switch_fiber = std::make_shared<Common::Fiber>(std::function<void(void*)>(OnSwitch), this);
this->state.needs_scheduling = true;
this->state.interrupt_task_thread_runnable = false;
this->state.should_count_idle = false;
this->state.idle_count = 0;
this->state.idle_thread_stack = nullptr;
this->state.highest_priority_thread = nullptr;
}
KScheduler::~KScheduler() = default;
Thread* KScheduler::GetCurrentThread() const {
if (current_thread) {
return current_thread;
}
return idle_thread;
}
u64 KScheduler::GetLastContextSwitchTicks() const {
return last_context_switch_time;
}
void KScheduler::RescheduleCurrentCore() {
ASSERT(GetCurrentThread()->GetDisableDispatchCount() == 1);
auto& phys_core = system.Kernel().PhysicalCore(core_id);
if (phys_core.IsInterrupted()) {
phys_core.ClearInterrupt();
}
guard.lock();
if (this->state.needs_scheduling) {
Schedule();
} else {
guard.unlock();
}
}
void KScheduler::OnThreadStart() {
SwitchContextStep2();
}
void KScheduler::Unload(Thread* thread) {
if (thread) {
thread->SetIsRunning(false);
if (thread->IsContinuousOnSVC() && !thread->IsHLEThread()) {
system.ArmInterface(core_id).ExceptionalExit();
thread->SetContinuousOnSVC(false);
}
if (!thread->IsHLEThread() && !thread->HasExited()) {
Core::ARM_Interface& 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 KScheduler::Reload(Thread* thread) {
if (thread) {
ASSERT_MSG(thread->GetSchedulingStatus() == ThreadSchedStatus::Runnable,
"Thread must be runnable.");
// Cancel any outstanding wakeup events for this thread
thread->SetIsRunning(true);
thread->SetWasRunning(false);
auto* const thread_owner_process = thread->GetOwnerProcess();
if (thread_owner_process != nullptr) {
system.Kernel().MakeCurrentProcess(thread_owner_process);
}
if (!thread->IsHLEThread()) {
Core::ARM_Interface& 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 KScheduler::SwitchContextStep2() {
// Load context of new thread
Reload(current_thread);
RescheduleCurrentCore();
}
void KScheduler::ScheduleImpl() {
Thread* previous_thread = current_thread;
current_thread = state.highest_priority_thread;
this->state.needs_scheduling = false;
if (current_thread == previous_thread) {
guard.unlock();
return;
}
Process* const previous_process = system.Kernel().CurrentProcess();
UpdateLastContextSwitchTime(previous_thread, previous_process);
// Save context for previous thread
Unload(previous_thread);
std::shared_ptr<Common::Fiber>* old_context;
if (previous_thread != nullptr) {
old_context = &previous_thread->GetHostContext();
} else {
old_context = &idle_thread->GetHostContext();
}
guard.unlock();
Common::Fiber::YieldTo(*old_context, switch_fiber);
/// When a thread wakes up, the scheduler may have changed to other in another core.
auto& next_scheduler = *system.Kernel().CurrentScheduler();
next_scheduler.SwitchContextStep2();
}
void KScheduler::OnSwitch(void* this_scheduler) {
KScheduler* sched = static_cast<KScheduler*>(this_scheduler);
sched->SwitchToCurrent();
}
void KScheduler::SwitchToCurrent() {
while (true) {
{
std::scoped_lock lock{guard};
current_thread = state.highest_priority_thread;
this->state.needs_scheduling = false;
}
const auto is_switch_pending = [this] {
std::scoped_lock lock{guard};
return !!this->state.needs_scheduling;
};
do {
if (current_thread != nullptr && !current_thread->IsHLEThread()) {
current_thread->context_guard.lock();
if (!current_thread->IsRunnable()) {
current_thread->context_guard.unlock();
break;
}
if (static_cast<u32>(current_thread->GetProcessorID()) != core_id) {
current_thread->context_guard.unlock();
break;
}
}
std::shared_ptr<Common::Fiber>* next_context;
if (current_thread != nullptr) {
next_context = &current_thread->GetHostContext();
} else {
next_context = &idle_thread->GetHostContext();
}
Common::Fiber::YieldTo(switch_fiber, *next_context);
} while (!is_switch_pending());
}
}
void KScheduler::UpdateLastContextSwitchTime(Thread* thread, Process* process) {
const u64 prev_switch_ticks = last_context_switch_time;
const u64 most_recent_switch_ticks = system.CoreTiming().GetCPUTicks();
const u64 update_ticks = most_recent_switch_ticks - prev_switch_ticks;
if (thread != nullptr) {
thread->UpdateCPUTimeTicks(update_ticks);
}
if (process != nullptr) {
process->UpdateCPUTimeTicks(update_ticks);
}
last_context_switch_time = most_recent_switch_ticks;
}
void KScheduler::Initialize() {
std::string name = "Idle Thread Id:" + std::to_string(core_id);
std::function<void(void*)> init_func = Core::CpuManager::GetIdleThreadStartFunc();
void* init_func_parameter = system.GetCpuManager().GetStartFuncParamater();
ThreadType type = static_cast<ThreadType>(THREADTYPE_KERNEL | THREADTYPE_HLE | THREADTYPE_IDLE);
auto thread_res = Thread::Create(system, type, name, 0, 64, 0, static_cast<u32>(core_id), 0,
nullptr, std::move(init_func), init_func_parameter);
idle_thread = thread_res.Unwrap().get();
{
KScopedSchedulerLock lock{system.Kernel()};
idle_thread->SetStatus(ThreadStatus::Ready);
}
}
SchedulerLock::SchedulerLock(KernelCore& kernel) : kernel{kernel} {
kernel.GlobalSchedulerContext().Lock();
}
SchedulerLock::~SchedulerLock() {
kernel.GlobalSchedulerContext().Unlock();
}
SchedulerLockAndSleep::SchedulerLockAndSleep(KernelCore& kernel, Handle& event_handle,
Thread* time_task, s64 nanoseconds)
: SchedulerLock{kernel}, event_handle{event_handle}, time_task{time_task}, nanoseconds{
nanoseconds} {
event_handle = InvalidHandle;
}
SchedulerLockAndSleep::~SchedulerLockAndSleep() {
if (sleep_cancelled) {
return;
}
auto& time_manager = kernel.TimeManager();
time_manager.ScheduleTimeEvent(event_handle, time_task, nanoseconds);
}
void SchedulerLockAndSleep::Release() {
if (sleep_cancelled) {
return;
}
auto& time_manager = kernel.TimeManager();
time_manager.ScheduleTimeEvent(event_handle, time_task, nanoseconds);
sleep_cancelled = true;
}
} // namespace Kernel

285
src/core/hle/kernel/scheduler.h → src/core/hle/kernel/k_scheduler.h
View file

@ -1,7 +1,10 @@
// Copyright 2018 yuzu emulator team
// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
// This file references various implementation details from Atmosphere, an open-source firmware for
// the Nintendo Switch. Copyright 2018-2020 Atmosphere-NX.
#pragma once
#include <atomic>
@ -11,8 +14,12 @@
#include "common/common_types.h"
#include "common/multi_level_queue.h"
#include "common/scope_exit.h"
#include "common/spin_lock.h"
#include "core/core_timing.h"
#include "core/hardware_properties.h"
#include "core/hle/kernel/k_priority_queue.h"
#include "core/hle/kernel/k_scheduler_lock.h"
#include "core/hle/kernel/thread.h"
namespace Common {
@ -30,10 +37,16 @@ class KernelCore;
class Process;
class SchedulerLock;
class GlobalScheduler final {
using KSchedulerPriorityQueue =
KPriorityQueue<Thread, Core::Hardware::NUM_CPU_CORES, THREADPRIO_LOWEST, THREADPRIO_HIGHEST>;
static constexpr s32 HighestCoreMigrationAllowedPriority = 2;
class GlobalSchedulerContext final {
friend class KScheduler;
public:
explicit GlobalScheduler(KernelCore& kernel);
~GlobalScheduler();
explicit GlobalSchedulerContext(KernelCore& kernel);
~GlobalSchedulerContext();
/// Adds a new thread to the scheduler
void AddThread(std::shared_ptr<Thread> thread);
@ -46,60 +59,6 @@ public:
return thread_list;
}
/// Notify the scheduler a thread's status has changed.
void AdjustSchedulingOnStatus(Thread* thread, u32 old_flags);
/// Notify the scheduler a thread's priority has changed.
void AdjustSchedulingOnPriority(Thread* thread, u32 old_priority);
/// Notify the scheduler a thread's core and/or affinity mask has changed.
void AdjustSchedulingOnAffinity(Thread* thread, u64 old_affinity_mask, s32 old_core);
/**
* Takes care of selecting the new scheduled threads in three steps:
*
* 1. First a thread is selected from the top of the priority queue. If no thread
* is obtained then we move to step two, else we are done.
*
* 2. Second we try to get a suggested thread that's not assigned to any core or
* that is not the top thread in that core.
*
* 3. Third is no suggested thread is found, we do a second pass and pick a running
* thread in another core and swap it with its current thread.
*
* returns the cores needing scheduling.
*/
u32 SelectThreads();
bool HaveReadyThreads(std::size_t core_id) const {
return !scheduled_queue[core_id].empty();
}
/**
* Takes a thread and moves it to the back of the it's priority list.
*
* @note This operation can be redundant and no scheduling is changed if marked as so.
*/
bool YieldThread(Thread* thread);
/**
* Takes a thread and moves it to the back of the it's priority list.
* Afterwards, tries to pick a suggested thread from the suggested queue that has worse time or
* a better priority than the next thread in the core.
*
* @note This operation can be redundant and no scheduling is changed if marked as so.
*/
bool YieldThreadAndBalanceLoad(Thread* thread);
/**
* Takes a thread and moves it out of the scheduling queue.
* and into the suggested queue. If no thread can be scheduled afterwards in that core,
* a suggested thread is obtained instead.
*
* @note This operation can be redundant and no scheduling is changed if marked as so.
*/
bool YieldThreadAndWaitForLoadBalancing(Thread* thread);
/**
* Rotates the scheduling queues of threads at a preemption priority and then does
* some core rebalancing. Preemption priorities can be found in the array
@ -113,15 +72,7 @@ public:
return Core::Hardware::NUM_CPU_CORES;
}
void SetReselectionPending() {
is_reselection_pending.store(true, std::memory_order_release);
}
bool IsReselectionPending() const {
return is_reselection_pending.load(std::memory_order_acquire);
}
void Shutdown();
bool IsLocked() const;
private:
friend class SchedulerLock;
@ -133,109 +84,50 @@ private:
/// and reschedules current core if needed.
void Unlock();
void EnableInterruptAndSchedule(u32 cores_pending_reschedule,
Core::EmuThreadHandle global_thread);
using LockType = KAbstractSchedulerLock<KScheduler>;
/**
* Add a thread to the suggested queue of a cpu core. Suggested threads may be
* picked if no thread is scheduled to run on the core.
*/
void Suggest(u32 priority, std::size_t core, Thread* thread);
KernelCore& kernel;
/**
* Remove a thread to the suggested queue of a cpu core. Suggested threads may be
* picked if no thread is scheduled to run on the core.
*/
void Unsuggest(u32 priority, std::size_t core, Thread* thread);
/**
* Add a thread to the scheduling queue of a cpu core. The thread is added at the
* back the queue in its priority level.
*/
void Schedule(u32 priority, std::size_t core, Thread* thread);
/**
* Add a thread to the scheduling queue of a cpu core. The thread is added at the
* front the queue in its priority level.
*/
void SchedulePrepend(u32 priority, std::size_t core, Thread* thread);
/// Reschedule an already scheduled thread based on a new priority
void Reschedule(u32 priority, std::size_t core, Thread* thread);
/// Unschedules a thread.
void Unschedule(u32 priority, std::size_t core, Thread* thread);
/**
* Transfers a thread into an specific core. If the destination_core is -1
* it will be unscheduled from its source code and added into its suggested
* queue.
*/
void TransferToCore(u32 priority, s32 destination_core, Thread* thread);
bool AskForReselectionOrMarkRedundant(Thread* current_thread, const Thread* winner);
static constexpr u32 min_regular_priority = 2;
std::array<Common::MultiLevelQueue<Thread*, THREADPRIO_COUNT>, Core::Hardware::NUM_CPU_CORES>
scheduled_queue;
std::array<Common::MultiLevelQueue<Thread*, THREADPRIO_COUNT>, Core::Hardware::NUM_CPU_CORES>
suggested_queue;
std::atomic<bool> is_reselection_pending{false};
// The priority levels at which the global scheduler preempts threads every 10 ms. They are
// ordered from Core 0 to Core 3.
std::array<u32, Core::Hardware::NUM_CPU_CORES> preemption_priorities = {59, 59, 59, 62};
/// Scheduler lock mechanisms.
bool is_locked{};
std::mutex inner_lock;
std::atomic<s64> scope_lock{};
Core::EmuThreadHandle current_owner{Core::EmuThreadHandle::InvalidHandle()};
Common::SpinLock global_list_guard{};
std::atomic_bool scheduler_update_needed{};
KSchedulerPriorityQueue priority_queue;
LockType scheduler_lock;
/// Lists all thread ids that aren't deleted/etc.
std::vector<std::shared_ptr<Thread>> thread_list;
KernelCore& kernel;
Common::SpinLock global_list_guard{};
};
class Scheduler final {
class KScheduler final {
public:
explicit Scheduler(Core::System& system, std::size_t core_id);
~Scheduler();
/// Returns whether there are any threads that are ready to run.
bool HaveReadyThreads() const;
explicit KScheduler(Core::System& system, std::size_t core_id);
~KScheduler();
/// Reschedules to the next available thread (call after current thread is suspended)
void TryDoContextSwitch();
void RescheduleCurrentCore();
/// Reschedules cores pending reschedule, to be called on EnableScheduling.
static void RescheduleCores(KernelCore& kernel, u64 cores_pending_reschedule,
Core::EmuThreadHandle global_thread);
/// The next two are for SingleCore Only.
/// Unload current thread before preempting core.
void Unload(Thread* thread);
void Unload();
/// Reload current thread after core preemption.
void Reload(Thread* thread);
void Reload();
/// Gets the current running thread
Thread* GetCurrentThread() const;
/// Gets the currently selected thread from the top of the multilevel queue
Thread* GetSelectedThread() const;
/// Gets the timestamp for the last context switch in ticks.
u64 GetLastContextSwitchTicks() const;
bool ContextSwitchPending() const {
return is_context_switch_pending;
return this->state.needs_scheduling;
}
void Initialize();
/// Shutdowns the scheduler.
void Shutdown();
void OnThreadStart();
std::shared_ptr<Common::Fiber>& ControlContext() {
@ -246,11 +138,90 @@ public:
return switch_fiber;
}
std::size_t CurrentCoreId() const {
return core_id;
}
u64 UpdateHighestPriorityThread(Thread* highest_thread);
/**
* Takes a thread and moves it to the back of the it's priority list.
*
* @note This operation can be redundant and no scheduling is changed if marked as so.
*/
void YieldWithoutCoreMigration();
/**
* Takes a thread and moves it to the back of the it's priority list.
* Afterwards, tries to pick a suggested thread from the suggested queue that has worse time or
* a better priority than the next thread in the core.
*
* @note This operation can be redundant and no scheduling is changed if marked as so.
*/
void YieldWithCoreMigration();
/**
* Takes a thread and moves it out of the scheduling queue.
* and into the suggested queue. If no thread can be scheduled afterwards in that core,
* a suggested thread is obtained instead.
*
* @note This operation can be redundant and no scheduling is changed if marked as so.
*/
void YieldToAnyThread();
/// Notify the scheduler a thread's status has changed.
static void OnThreadStateChanged(KernelCore& kernel, Thread* thread, u32 old_state);
/// Notify the scheduler a thread's priority has changed.
static void OnThreadPriorityChanged(KernelCore& kernel, Thread* thread, Thread* current_thread,
u32 old_priority);
/// Notify the scheduler a thread's core and/or affinity mask has changed.
static void OnThreadAffinityMaskChanged(KernelCore& kernel, Thread* thread,
const KAffinityMask& old_affinity, s32 old_core);
private:
friend class GlobalScheduler;
/**
* Takes care of selecting the new scheduled threads in three steps:
*
* 1. First a thread is selected from the top of the priority queue. If no thread
* is obtained then we move to step two, else we are done.
*
* 2. Second we try to get a suggested thread that's not assigned to any core or
* that is not the top thread in that core.
*
* 3. Third is no suggested thread is found, we do a second pass and pick a running
* thread in another core and swap it with its current thread.
*
* returns the cores needing scheduling.
*/
static u64 UpdateHighestPriorityThreadsImpl(KernelCore& kernel);
void RotateScheduledQueue(s32 core_id, s32 priority);
public:
static bool CanSchedule(KernelCore& kernel);
static bool IsSchedulerUpdateNeeded(const KernelCore& kernel);
static void SetSchedulerUpdateNeeded(KernelCore& kernel);
static void ClearSchedulerUpdateNeeded(KernelCore& kernel);
static void DisableScheduling(KernelCore& kernel);
static void EnableScheduling(KernelCore& kernel, u64 cores_needing_scheduling,
Core::EmuThreadHandle global_thread);
static u64 UpdateHighestPriorityThreads(KernelCore& kernel);
private:
friend class GlobalSchedulerContext;
static KSchedulerPriorityQueue& GetPriorityQueue(KernelCore& kernel);
void Schedule() {
ASSERT(GetCurrentThread()->GetDisableDispatchCount() == 1);
this->ScheduleImpl();
}
/// Switches the CPU's active thread context to that of the specified thread
void SwitchContext();
void ScheduleImpl();
void SwitchThread(Thread* next_thread);
/// When a thread wakes up, it must run this through it's new scheduler
void SwitchContextStep2();
@ -271,22 +242,28 @@ private:
static void OnSwitch(void* this_scheduler);
void SwitchToCurrent();
std::shared_ptr<Thread> current_thread = nullptr;
std::shared_ptr<Thread> selected_thread = nullptr;
std::shared_ptr<Thread> current_thread_prev = nullptr;
std::shared_ptr<Thread> selected_thread_set = nullptr;
std::shared_ptr<Thread> idle_thread = nullptr;
private:
Thread* current_thread{};
Thread* idle_thread{};
std::shared_ptr<Common::Fiber> switch_fiber = nullptr;
std::shared_ptr<Common::Fiber> switch_fiber{};
struct SchedulingState {
std::atomic<bool> needs_scheduling;
bool interrupt_task_thread_runnable{};
bool should_count_idle{};
u64 idle_count{};
Thread* highest_priority_thread{};
void* idle_thread_stack{};
};
SchedulingState state;
Core::System& system;
u64 last_context_switch_time = 0;
u64 idle_selection_count = 0;
u64 last_context_switch_time{};
const std::size_t core_id;
Common::SpinLock guard{};
bool is_context_switch_pending = false;
};
class SchedulerLock {

59
src/core/hle/kernel/kernel.cpp
View file

@ -27,6 +27,7 @@
#include "core/hle/kernel/client_port.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/memory/memory_layout.h"
#include "core/hle/kernel/memory/memory_manager.h"
@ -34,7 +35,6 @@
#include "core/hle/kernel/physical_core.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/shared_memory.h"
#include "core/hle/kernel/synchronization.h"
#include "core/hle/kernel/thread.h"
@ -49,17 +49,18 @@ namespace Kernel {
struct KernelCore::Impl {
explicit Impl(Core::System& system, KernelCore& kernel)
: global_scheduler{kernel}, synchronization{system}, time_manager{system},
global_handle_table{kernel}, system{system} {}
: synchronization{system}, time_manager{system}, global_handle_table{kernel}, system{
system} {}
void SetMulticore(bool is_multicore) {
this->is_multicore = is_multicore;
}
void Initialize(KernelCore& kernel) {
Shutdown();
RegisterHostThread();
global_scheduler_context = std::make_unique<Kernel::GlobalSchedulerContext>(kernel);
InitializePhysicalCores();
InitializeSystemResourceLimit(kernel);
InitializeMemoryLayout();
@ -86,29 +87,20 @@ struct KernelCore::Impl {
}
}
for (std::size_t i = 0; i < cores.size(); i++) {
cores[i].Shutdown();
schedulers[i].reset();
}
cores.clear();
process_list.clear();
current_process = nullptr;
system_resource_limit = nullptr;
global_handle_table.Clear();
preemption_event = nullptr;
global_scheduler.Shutdown();
named_ports.clear();
for (auto& core : cores) {
core.Shutdown();
}
cores.clear();
exclusive_monitor.reset();
num_host_threads = 0;
@ -121,7 +113,7 @@ struct KernelCore::Impl {
exclusive_monitor =
Core::MakeExclusiveMonitor(system.Memory(), Core::Hardware::NUM_CPU_CORES);
for (std::size_t i = 0; i < Core::Hardware::NUM_CPU_CORES; i++) {
schedulers[i] = std::make_unique<Kernel::Scheduler>(system, i);
schedulers[i] = std::make_unique<Kernel::KScheduler>(system, i);
cores.emplace_back(i, system, *schedulers[i], interrupts);
}
}
@ -155,7 +147,7 @@ struct KernelCore::Impl {
"PreemptionCallback", [this, &kernel](std::uintptr_t, std::chrono::nanoseconds) {
{
SchedulerLock lock(kernel);
global_scheduler.PreemptThreads();
global_scheduler_context->PreemptThreads();
}
const auto time_interval = std::chrono::nanoseconds{
Core::Timing::msToCycles(std::chrono::milliseconds(10))};
@ -245,7 +237,7 @@ struct KernelCore::Impl {
if (result.host_handle >= Core::Hardware::NUM_CPU_CORES) {
return result;
}
const Kernel::Scheduler& sched = cores[result.host_handle].Scheduler();
const Kernel::KScheduler& sched = cores[result.host_handle].Scheduler();
const Kernel::Thread* current = sched.GetCurrentThread();
if (current != nullptr && !current->IsPhantomMode()) {
result.guest_handle = current->GetGlobalHandle();
@ -314,7 +306,7 @@ struct KernelCore::Impl {
// Lists all processes that exist in the current session.
std::vector<std::shared_ptr<Process>> process_list;
Process* current_process = nullptr;
Kernel::GlobalScheduler global_scheduler;
std::unique_ptr<Kernel::GlobalSchedulerContext> global_scheduler_context;
Kernel::Synchronization synchronization;
Kernel::TimeManager time_manager;
@ -355,7 +347,7 @@ struct KernelCore::Impl {
std::array<std::shared_ptr<Thread>, Core::Hardware::NUM_CPU_CORES> suspend_threads{};
std::array<Core::CPUInterruptHandler, Core::Hardware::NUM_CPU_CORES> interrupts{};
std::array<std::unique_ptr<Kernel::Scheduler>, Core::Hardware::NUM_CPU_CORES> schedulers{};
std::array<std::unique_ptr<Kernel::KScheduler>, Core::Hardware::NUM_CPU_CORES> schedulers{};
bool is_multicore{};
std::thread::id single_core_thread_id{};
@ -415,19 +407,19 @@ const std::vector<std::shared_ptr<Process>>& KernelCore::GetProcessList() const
return impl->process_list;
}
Kernel::GlobalScheduler& KernelCore::GlobalScheduler() {
return impl->global_scheduler;
Kernel::GlobalSchedulerContext& KernelCore::GlobalSchedulerContext() {
return *impl->global_scheduler_context;
}
const Kernel::GlobalScheduler& KernelCore::GlobalScheduler() const {
return impl->global_scheduler;
const Kernel::GlobalSchedulerContext& KernelCore::GlobalSchedulerContext() const {
return *impl->global_scheduler_context;
}
Kernel::Scheduler& KernelCore::Scheduler(std::size_t id) {
Kernel::KScheduler& KernelCore::Scheduler(std::size_t id) {
return *impl->schedulers[id];
}
const Kernel::Scheduler& KernelCore::Scheduler(std::size_t id) const {
const Kernel::KScheduler& KernelCore::Scheduler(std::size_t id) const {
return *impl->schedulers[id];
}
@ -451,16 +443,13 @@ const Kernel::PhysicalCore& KernelCore::CurrentPhysicalCore() const {
return impl->cores[core_id];
}
Kernel::Scheduler& KernelCore::CurrentScheduler() {
Kernel::KScheduler* KernelCore::CurrentScheduler() {
u32 core_id = impl->GetCurrentHostThreadID();
ASSERT(core_id < Core::Hardware::NUM_CPU_CORES);
return *impl->schedulers[core_id];
}
const Kernel::Scheduler& KernelCore::CurrentScheduler() const {
u32 core_id = impl->GetCurrentHostThreadID();
ASSERT(core_id < Core::Hardware::NUM_CPU_CORES);
return *impl->schedulers[core_id];
if (core_id >= Core::Hardware::NUM_CPU_CORES) {
// This is expected when called from not a guest thread
return {};
}
return impl->schedulers[core_id].get();
}
std::array<Core::CPUInterruptHandler, Core::Hardware::NUM_CPU_CORES>& KernelCore::Interrupts() {

17
src/core/hle/kernel/kernel.h
View file

@ -35,12 +35,12 @@ class SlabHeap;
class AddressArbiter;
class ClientPort;
class GlobalScheduler;
class GlobalSchedulerContext;
class HandleTable;
class PhysicalCore;
class Process;
class ResourceLimit;
class Scheduler;
class KScheduler;
class SharedMemory;
class Synchronization;
class Thread;
@ -102,16 +102,16 @@ public:
const std::vector<std::shared_ptr<Process>>& GetProcessList() const;
/// Gets the sole instance of the global scheduler
Kernel::GlobalScheduler& GlobalScheduler();
Kernel::GlobalSchedulerContext& GlobalSchedulerContext();
/// Gets the sole instance of the global scheduler
const Kernel::GlobalScheduler& GlobalScheduler() const;
const Kernel::GlobalSchedulerContext& GlobalSchedulerContext() const;
/// Gets the sole instance of the Scheduler assoviated with cpu core 'id'
Kernel::Scheduler& Scheduler(std::size_t id);
Kernel::KScheduler& Scheduler(std::size_t id);
/// Gets the sole instance of the Scheduler assoviated with cpu core 'id'
const Kernel::Scheduler& Scheduler(std::size_t id) const;
const Kernel::KScheduler& Scheduler(std::size_t id) const;
/// Gets the an instance of the respective physical CPU core.
Kernel::PhysicalCore& PhysicalCore(std::size_t id);
@ -120,10 +120,7 @@ public:
const Kernel::PhysicalCore& PhysicalCore(std::size_t id) const;
/// Gets the sole instance of the Scheduler at the current running core.
Kernel::Scheduler& CurrentScheduler();
/// Gets the sole instance of the Scheduler at the current running core.
const Kernel::Scheduler& CurrentScheduler() const;
Kernel::KScheduler* CurrentScheduler();
/// Gets the an instance of the current physical CPU core.
Kernel::PhysicalCore& CurrentPhysicalCore();

6
src/core/hle/kernel/mutex.cpp
View file

@ -11,11 +11,11 @@
#include "core/core.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/mutex.h"
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/result.h"
#include "core/memory.h"
@ -73,7 +73,7 @@ ResultCode Mutex::TryAcquire(VAddr address, Handle holding_thread_handle,
auto& kernel = system.Kernel();
std::shared_ptr<Thread> current_thread =
SharedFrom(kernel.CurrentScheduler().GetCurrentThread());
SharedFrom(kernel.CurrentScheduler()->GetCurrentThread());
{
SchedulerLock lock(kernel);
// The mutex address must be 4-byte aligned
@ -156,7 +156,7 @@ ResultCode Mutex::Release(VAddr address) {
SchedulerLock lock(kernel);
std::shared_ptr<Thread> current_thread =
SharedFrom(kernel.CurrentScheduler().GetCurrentThread());
SharedFrom(kernel.CurrentScheduler()->GetCurrentThread());
auto [result, new_owner] = Unlock(current_thread, address);

9
src/core/hle/kernel/physical_core.cpp
View file

@ -7,14 +7,14 @@
#include "core/arm/dynarmic/arm_dynarmic_32.h"
#include "core/arm/dynarmic/arm_dynarmic_64.h"
#include "core/core.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/physical_core.h"
#include "core/hle/kernel/scheduler.h"
namespace Kernel {
PhysicalCore::PhysicalCore(std::size_t core_index, Core::System& system,
Kernel::Scheduler& scheduler, Core::CPUInterrupts& interrupts)
Kernel::KScheduler& scheduler, Core::CPUInterrupts& interrupts)
: core_index{core_index}, system{system}, scheduler{scheduler},
interrupts{interrupts}, guard{std::make_unique<Common::SpinLock>()} {}
@ -37,17 +37,12 @@ void PhysicalCore::Initialize([[maybe_unused]] bool is_64_bit) {
void PhysicalCore::Run() {
arm_interface->Run();
arm_interface->ClearExclusiveState();
}
void PhysicalCore::Idle() {
interrupts[core_index].AwaitInterrupt();
}
void PhysicalCore::Shutdown() {
scheduler.Shutdown();
}
bool PhysicalCore::IsInterrupted() const {
return interrupts[core_index].IsInterrupted();
}

13
src/core/hle/kernel/physical_core.h
View file

@ -15,7 +15,7 @@ class SpinLock;
}
namespace Kernel {
class Scheduler;
class KScheduler;
} // namespace Kernel
namespace Core {
@ -28,7 +28,7 @@ namespace Kernel {
class PhysicalCore {
public:
PhysicalCore(std::size_t core_index, Core::System& system, Kernel::Scheduler& scheduler,
PhysicalCore(std::size_t core_index, Core::System& system, Kernel::KScheduler& scheduler,
Core::CPUInterrupts& interrupts);
~PhysicalCore();
@ -55,9 +55,6 @@ public:
/// Check if this core is interrupted
bool IsInterrupted() const;
// Shutdown this physical core.
void Shutdown();
bool IsInitialized() const {
return arm_interface != nullptr;
}
@ -82,18 +79,18 @@ public:
return core_index;
}
Kernel::Scheduler& Scheduler() {
Kernel::KScheduler& Scheduler() {
return scheduler;
}
const Kernel::Scheduler& Scheduler() const {
const Kernel::KScheduler& Scheduler() const {
return scheduler;
}
private:
const std::size_t core_index;
Core::System& system;
Kernel::Scheduler& scheduler;
Kernel::KScheduler& scheduler;
Core::CPUInterrupts& interrupts;
std::unique_ptr<Common::SpinLock> guard;
std::unique_ptr<Core::ARM_Interface> arm_interface;

6
src/core/hle/kernel/process.cpp
View file

@ -15,13 +15,13 @@
#include "core/file_sys/program_metadata.h"
#include "core/hle/kernel/code_set.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/memory/memory_block_manager.h"
#include "core/hle/kernel/memory/page_table.h"
#include "core/hle/kernel/memory/slab_heap.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/lock.h"
#include "core/memory.h"
@ -314,7 +314,7 @@ void Process::PrepareForTermination() {
if (thread->GetOwnerProcess() != this)
continue;
if (thread.get() == system.CurrentScheduler().GetCurrentThread())
if (thread.get() == kernel.CurrentScheduler()->GetCurrentThread())
continue;
// TODO(Subv): When are the other running/ready threads terminated?
@ -325,7 +325,7 @@ void Process::PrepareForTermination() {
}
};
stop_threads(system.GlobalScheduler().GetThreadList());
stop_threads(system.GlobalSchedulerContext().GetThreadList());
FreeTLSRegion(tls_region_address);
tls_region_address = 0;

2
src/core/hle/kernel/readable_event.cpp
View file

@ -6,10 +6,10 @@
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/readable_event.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {

819
src/core/hle/kernel/scheduler.cpp
View file

@ -1,819 +0,0 @@
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
//
// SelectThreads, Yield functions originally by TuxSH.
// licensed under GPLv2 or later under exception provided by the author.
#include <algorithm>
#include <mutex>
#include <set>
#include <unordered_set>
#include <utility>
#include "common/assert.h"
#include "common/bit_util.h"
#include "common/fiber.h"
#include "common/logging/log.h"
#include "core/arm/arm_interface.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/cpu_manager.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/physical_core.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/time_manager.h"
namespace Kernel {
GlobalScheduler::GlobalScheduler(KernelCore& kernel) : kernel{kernel} {}
GlobalScheduler::~GlobalScheduler() = default;
void GlobalScheduler::AddThread(std::shared_ptr<Thread> thread) {
std::scoped_lock lock{global_list_guard};
thread_list.push_back(std::move(thread));
}
void GlobalScheduler::RemoveThread(std::shared_ptr<Thread> thread) {
std::scoped_lock lock{global_list_guard};
thread_list.erase(std::remove(thread_list.begin(), thread_list.end(), thread),
thread_list.end());
}
u32 GlobalScheduler::SelectThreads() {
ASSERT(is_locked);
const auto update_thread = [](Thread* thread, Scheduler& sched) {
std::scoped_lock lock{sched.guard};
if (thread != sched.selected_thread_set.get()) {
if (thread == nullptr) {
++sched.idle_selection_count;
}
sched.selected_thread_set = SharedFrom(thread);
}
const bool reschedule_pending =
sched.is_context_switch_pending || (sched.selected_thread_set != sched.current_thread);
sched.is_context_switch_pending = reschedule_pending;
std::atomic_thread_fence(std::memory_order_seq_cst);
return reschedule_pending;
};
if (!is_reselection_pending.load()) {
return 0;
}
std::array<Thread*, Core::Hardware::NUM_CPU_CORES> top_threads{};
u32 idle_cores{};
// Step 1: Get top thread in schedule queue.
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
Thread* top_thread =
scheduled_queue[core].empty() ? nullptr : scheduled_queue[core].front();
if (top_thread != nullptr) {
// TODO(Blinkhawk): Implement Thread Pinning
} else {
idle_cores |= (1U << core);
}
top_threads[core] = top_thread;
}
while (idle_cores != 0) {
u32 core_id = Common::CountTrailingZeroes32(idle_cores);
if (!suggested_queue[core_id].empty()) {
std::array<s32, Core::Hardware::NUM_CPU_CORES> migration_candidates{};
std::size_t num_candidates = 0;
auto iter = suggested_queue[core_id].begin();
Thread* suggested = nullptr;
// Step 2: Try selecting a suggested thread.
while (iter != suggested_queue[core_id].end()) {
suggested = *iter;
iter++;
s32 suggested_core_id = suggested->GetProcessorID();
Thread* top_thread =
suggested_core_id >= 0 ? top_threads[suggested_core_id] : nullptr;
if (top_thread != suggested) {
if (top_thread != nullptr &&
top_thread->GetPriority() < THREADPRIO_MAX_CORE_MIGRATION) {
suggested = nullptr;
break;
// There's a too high thread to do core migration, cancel
}
TransferToCore(suggested->GetPriority(), static_cast<s32>(core_id), suggested);
break;
}
suggested = nullptr;
migration_candidates[num_candidates++] = suggested_core_id;
}
// Step 3: Select a suggested thread from another core
if (suggested == nullptr) {
for (std::size_t i = 0; i < num_candidates; i++) {
s32 candidate_core = migration_candidates[i];
suggested = top_threads[candidate_core];
auto it = scheduled_queue[candidate_core].begin();
it++;
Thread* next = it != scheduled_queue[candidate_core].end() ? *it : nullptr;
if (next != nullptr) {
TransferToCore(suggested->GetPriority(), static_cast<s32>(core_id),
suggested);
top_threads[candidate_core] = next;
break;
} else {
suggested = nullptr;
}
}
}
top_threads[core_id] = suggested;
}
idle_cores &= ~(1U << core_id);
}
u32 cores_needing_context_switch{};
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
Scheduler& sched = kernel.Scheduler(core);
ASSERT(top_threads[core] == nullptr ||
static_cast<u32>(top_threads[core]->GetProcessorID()) == core);
if (update_thread(top_threads[core], sched)) {
cores_needing_context_switch |= (1U << core);
}
}
return cores_needing_context_switch;
}
bool GlobalScheduler::YieldThread(Thread* yielding_thread) {
ASSERT(is_locked);
// Note: caller should use critical section, etc.
if (!yielding_thread->IsRunnable()) {
// Normally this case shouldn't happen except for SetThreadActivity.
is_reselection_pending.store(true, std::memory_order_release);
return false;
}
const u32 core_id = static_cast<u32>(yielding_thread->GetProcessorID());
const u32 priority = yielding_thread->GetPriority();
// Yield the thread
Reschedule(priority, core_id, yielding_thread);
const Thread* const winner = scheduled_queue[core_id].front();
if (kernel.GetCurrentHostThreadID() != core_id) {
is_reselection_pending.store(true, std::memory_order_release);
}
return AskForReselectionOrMarkRedundant(yielding_thread, winner);
}
bool GlobalScheduler::YieldThreadAndBalanceLoad(Thread* yielding_thread) {
ASSERT(is_locked);
// Note: caller should check if !thread.IsSchedulerOperationRedundant and use critical section,
// etc.
if (!yielding_thread->IsRunnable()) {
// Normally this case shouldn't happen except for SetThreadActivity.
is_reselection_pending.store(true, std::memory_order_release);
return false;
}
const u32 core_id = static_cast<u32>(yielding_thread->GetProcessorID());
const u32 priority = yielding_thread->GetPriority();
// Yield the thread
Reschedule(priority, core_id, yielding_thread);
std::array<Thread*, Core::Hardware::NUM_CPU_CORES> current_threads;
for (std::size_t i = 0; i < current_threads.size(); i++) {
current_threads[i] = scheduled_queue[i].empty() ? nullptr : scheduled_queue[i].front();
}
Thread* next_thread = scheduled_queue[core_id].front(priority);
Thread* winner = nullptr;
for (auto& thread : suggested_queue[core_id]) {
const s32 source_core = thread->GetProcessorID();
if (source_core >= 0) {
if (current_threads[source_core] != nullptr) {
if (thread == current_threads[source_core] ||
current_threads[source_core]->GetPriority() < min_regular_priority) {
continue;
}
}
}
if (next_thread->GetLastRunningTicks() >= thread->GetLastRunningTicks() ||
next_thread->GetPriority() < thread->GetPriority()) {
if (thread->GetPriority() <= priority) {
winner = thread;
break;
}
}
}
if (winner != nullptr) {
if (winner != yielding_thread) {
TransferToCore(winner->GetPriority(), s32(core_id), winner);
}
} else {
winner = next_thread;
}
if (kernel.GetCurrentHostThreadID() != core_id) {
is_reselection_pending.store(true, std::memory_order_release);
}
return AskForReselectionOrMarkRedundant(yielding_thread, winner);
}
bool GlobalScheduler::YieldThreadAndWaitForLoadBalancing(Thread* yielding_thread) {
ASSERT(is_locked);
// Note: caller should check if !thread.IsSchedulerOperationRedundant and use critical section,
// etc.
if (!yielding_thread->IsRunnable()) {
// Normally this case shouldn't happen except for SetThreadActivity.
is_reselection_pending.store(true, std::memory_order_release);
return false;
}
Thread* winner = nullptr;
const u32 core_id = static_cast<u32>(yielding_thread->GetProcessorID());
// Remove the thread from its scheduled mlq, put it on the corresponding "suggested" one instead
TransferToCore(yielding_thread->GetPriority(), -1, yielding_thread);
// If the core is idle, perform load balancing, excluding the threads that have just used this
// function...
if (scheduled_queue[core_id].empty()) {
// Here, "current_threads" is calculated after the ""yield"", unlike yield -1
std::array<Thread*, Core::Hardware::NUM_CPU_CORES> current_threads;
for (std::size_t i = 0; i < current_threads.size(); i++) {
current_threads[i] = scheduled_queue[i].empty() ? nullptr : scheduled_queue[i].front();
}
for (auto& thread : suggested_queue[core_id]) {
const s32 source_core = thread->GetProcessorID();
if (source_core < 0 || thread == current_threads[source_core]) {
continue;
}
if (current_threads[source_core] == nullptr ||
current_threads[source_core]->GetPriority() >= min_regular_priority) {
winner = thread;
}
break;
}
if (winner != nullptr) {
if (winner != yielding_thread) {
TransferToCore(winner->GetPriority(), static_cast<s32>(core_id), winner);
}
} else {
winner = yielding_thread;
}
} else {
winner = scheduled_queue[core_id].front();
}
if (kernel.GetCurrentHostThreadID() != core_id) {
is_reselection_pending.store(true, std::memory_order_release);
}
return AskForReselectionOrMarkRedundant(yielding_thread, winner);
}
void GlobalScheduler::PreemptThreads() {
ASSERT(is_locked);
for (std::size_t core_id = 0; core_id < Core::Hardware::NUM_CPU_CORES; core_id++) {
const u32 priority = preemption_priorities[core_id];
if (scheduled_queue[core_id].size(priority) > 0) {
if (scheduled_queue[core_id].size(priority) > 1) {
scheduled_queue[core_id].front(priority)->IncrementYieldCount();
}
scheduled_queue[core_id].yield(priority);
if (scheduled_queue[core_id].size(priority) > 1) {
scheduled_queue[core_id].front(priority)->IncrementYieldCount();
}
}
Thread* current_thread =
scheduled_queue[core_id].empty() ? nullptr : scheduled_queue[core_id].front();
Thread* winner = nullptr;
for (auto& thread : suggested_queue[core_id]) {
const s32 source_core = thread->GetProcessorID();
if (thread->GetPriority() != priority) {
continue;
}
if (source_core >= 0) {
Thread* next_thread = scheduled_queue[source_core].empty()
? nullptr
: scheduled_queue[source_core].front();
if (next_thread != nullptr && next_thread->GetPriority() < 2) {
break;
}
if (next_thread == thread) {
continue;
}
}
if (current_thread != nullptr &&
current_thread->GetLastRunningTicks() >= thread->GetLastRunningTicks()) {
winner = thread;
break;
}
}
if (winner != nullptr) {
TransferToCore(winner->GetPriority(), s32(core_id), winner);
current_thread =
winner->GetPriority() <= current_thread->GetPriority() ? winner : current_thread;
}
if (current_thread != nullptr && current_thread->GetPriority() > priority) {
for (auto& thread : suggested_queue[core_id]) {
const s32 source_core = thread->GetProcessorID();
if (thread->GetPriority() < priority) {
continue;
}
if (source_core >= 0) {
Thread* next_thread = scheduled_queue[source_core].empty()
? nullptr
: scheduled_queue[source_core].front();
if (next_thread != nullptr && next_thread->GetPriority() < 2) {
break;
}
if (next_thread == thread) {
continue;
}
}
if (current_thread != nullptr &&
current_thread->GetLastRunningTicks() >= thread->GetLastRunningTicks()) {
winner = thread;
break;
}
}
if (winner != nullptr) {
TransferToCore(winner->GetPriority(), s32(core_id), winner);
current_thread = winner;
}
}
is_reselection_pending.store(true, std::memory_order_release);
}
}
void GlobalScheduler::EnableInterruptAndSchedule(u32 cores_pending_reschedule,
Core::EmuThreadHandle global_thread) {
u32 current_core = global_thread.host_handle;
bool must_context_switch = global_thread.guest_handle != InvalidHandle &&
(current_core < Core::Hardware::NUM_CPU_CORES);
while (cores_pending_reschedule != 0) {
u32 core = Common::CountTrailingZeroes32(cores_pending_reschedule);
ASSERT(core < Core::Hardware::NUM_CPU_CORES);
if (!must_context_switch || core != current_core) {
auto& phys_core = kernel.PhysicalCore(core);
phys_core.Interrupt();
} else {
must_context_switch = true;
}
cores_pending_reschedule &= ~(1U << core);
}
if (must_context_switch) {
auto& core_scheduler = kernel.CurrentScheduler();
kernel.ExitSVCProfile();
core_scheduler.TryDoContextSwitch();
kernel.EnterSVCProfile();
}
}
void GlobalScheduler::Suggest(u32 priority, std::size_t core, Thread* thread) {
ASSERT(is_locked);
suggested_queue[core].add(thread, priority);
}
void GlobalScheduler::Unsuggest(u32 priority, std::size_t core, Thread* thread) {
ASSERT(is_locked);
suggested_queue[core].remove(thread, priority);
}
void GlobalScheduler::Schedule(u32 priority, std::size_t core, Thread* thread) {
ASSERT(is_locked);
ASSERT_MSG(thread->GetProcessorID() == s32(core), "Thread must be assigned to this core.");
scheduled_queue[core].add(thread, priority);
}
void GlobalScheduler::SchedulePrepend(u32 priority, std::size_t core, Thread* thread) {
ASSERT(is_locked);
ASSERT_MSG(thread->GetProcessorID() == s32(core), "Thread must be assigned to this core.");
scheduled_queue[core].add(thread, priority, false);
}
void GlobalScheduler::Reschedule(u32 priority, std::size_t core, Thread* thread) {
ASSERT(is_locked);
scheduled_queue[core].remove(thread, priority);
scheduled_queue[core].add(thread, priority);
}
void GlobalScheduler::Unschedule(u32 priority, std::size_t core, Thread* thread) {
ASSERT(is_locked);
scheduled_queue[core].remove(thread, priority);
}
void GlobalScheduler::TransferToCore(u32 priority, s32 destination_core, Thread* thread) {
ASSERT(is_locked);
const bool schedulable = thread->GetPriority() < THREADPRIO_COUNT;
const s32 source_core = thread->GetProcessorID();
if (source_core == destination_core || !schedulable) {
return;
}
thread->SetProcessorID(destination_core);
if (source_core >= 0) {
Unschedule(priority, static_cast<u32>(source_core), thread);
}
if (destination_core >= 0) {
Unsuggest(priority, static_cast<u32>(destination_core), thread);
Schedule(priority, static_cast<u32>(destination_core), thread);
}
if (source_core >= 0) {
Suggest(priority, static_cast<u32>(source_core), thread);
}
}
bool GlobalScheduler::AskForReselectionOrMarkRedundant(Thread* current_thread,
const Thread* winner) {
if (current_thread == winner) {
current_thread->IncrementYieldCount();
return true;
} else {
is_reselection_pending.store(true, std::memory_order_release);
return false;
}
}
void GlobalScheduler::AdjustSchedulingOnStatus(Thread* thread, u32 old_flags) {
if (old_flags == thread->scheduling_state) {
return;
}
ASSERT(is_locked);
if (old_flags == static_cast<u32>(ThreadSchedStatus::Runnable)) {
// In this case the thread was running, now it's pausing/exitting
if (thread->processor_id >= 0) {
Unschedule(thread->current_priority, static_cast<u32>(thread->processor_id), thread);
}
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
if (core != static_cast<u32>(thread->processor_id) &&
thread->affinity_mask.GetAffinity(core)) {
Unsuggest(thread->current_priority, core, thread);
}
}
} else if (thread->scheduling_state == static_cast<u32>(ThreadSchedStatus::Runnable)) {
// The thread is now set to running from being stopped
if (thread->processor_id >= 0) {
Schedule(thread->current_priority, static_cast<u32>(thread->processor_id), thread);
}
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
if (core != static_cast<u32>(thread->processor_id) &&
thread->affinity_mask.GetAffinity(core)) {
Suggest(thread->current_priority, core, thread);
}
}
}
SetReselectionPending();
}
void GlobalScheduler::AdjustSchedulingOnPriority(Thread* thread, u32 old_priority) {
if (thread->scheduling_state != static_cast<u32>(ThreadSchedStatus::Runnable)) {
return;
}
ASSERT(is_locked);
if (thread->processor_id >= 0) {
Unschedule(old_priority, static_cast<u32>(thread->processor_id), thread);
}
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
if (core != static_cast<u32>(thread->processor_id) &&
thread->affinity_mask.GetAffinity(core)) {
Unsuggest(old_priority, core, thread);
}
}
if (thread->processor_id >= 0) {
if (thread == kernel.CurrentScheduler().GetCurrentThread()) {
SchedulePrepend(thread->current_priority, static_cast<u32>(thread->processor_id),
thread);
} else {
Schedule(thread->current_priority, static_cast<u32>(thread->processor_id), thread);
}
}
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
if (core != static_cast<u32>(thread->processor_id) &&
thread->affinity_mask.GetAffinity(core)) {
Suggest(thread->current_priority, core, thread);
}
}
thread->IncrementYieldCount();
SetReselectionPending();
}
void GlobalScheduler::AdjustSchedulingOnAffinity(Thread* thread, u64 old_affinity_mask,
s32 old_core) {
if (thread->scheduling_state != static_cast<u32>(ThreadSchedStatus::Runnable) ||
thread->current_priority >= THREADPRIO_COUNT) {
return;
}
ASSERT(is_locked);
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
if (((old_affinity_mask >> core) & 1) != 0) {
if (core == static_cast<u32>(old_core)) {
Unschedule(thread->current_priority, core, thread);
} else {
Unsuggest(thread->current_priority, core, thread);
}
}
}
for (u32 core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
if (thread->affinity_mask.GetAffinity(core)) {
if (core == static_cast<u32>(thread->processor_id)) {
Schedule(thread->current_priority, core, thread);
} else {
Suggest(thread->current_priority, core, thread);
}
}
}
thread->IncrementYieldCount();
SetReselectionPending();
}
void GlobalScheduler::Shutdown() {
for (std::size_t core = 0; core < Core::Hardware::NUM_CPU_CORES; core++) {
scheduled_queue[core].clear();
suggested_queue[core].clear();
}
thread_list.clear();
}
void GlobalScheduler::Lock() {
Core::EmuThreadHandle current_thread = kernel.GetCurrentEmuThreadID();
ASSERT(!current_thread.IsInvalid());
if (current_thread == current_owner) {
++scope_lock;
} else {
inner_lock.lock();
is_locked = true;
current_owner = current_thread;
ASSERT(current_owner != Core::EmuThreadHandle::InvalidHandle());
scope_lock = 1;
}
}
void GlobalScheduler::Unlock() {
if (--scope_lock != 0) {
ASSERT(scope_lock > 0);
return;
}
u32 cores_pending_reschedule = SelectThreads();
Core::EmuThreadHandle leaving_thread = current_owner;
current_owner = Core::EmuThreadHandle::InvalidHandle();
scope_lock = 1;
is_locked = false;
inner_lock.unlock();
EnableInterruptAndSchedule(cores_pending_reschedule, leaving_thread);
}
Scheduler::Scheduler(Core::System& system, std::size_t core_id) : system(system), core_id(core_id) {
switch_fiber = std::make_shared<Common::Fiber>(std::function<void(void*)>(OnSwitch), this);
}
Scheduler::~Scheduler() = default;
bool Scheduler::HaveReadyThreads() const {
return system.GlobalScheduler().HaveReadyThreads(core_id);
}
Thread* Scheduler::GetCurrentThread() const {
if (current_thread) {
return current_thread.get();
}
return idle_thread.get();
}
Thread* Scheduler::GetSelectedThread() const {
return selected_thread.get();
}
u64 Scheduler::GetLastContextSwitchTicks() const {
return last_context_switch_time;
}
void Scheduler::TryDoContextSwitch() {
auto& phys_core = system.Kernel().CurrentPhysicalCore();
if (phys_core.IsInterrupted()) {
phys_core.ClearInterrupt();
}
guard.lock();
if (is_context_switch_pending) {
SwitchContext();
} else {
guard.unlock();
}
}
void Scheduler::OnThreadStart() {
SwitchContextStep2();
}
void Scheduler::Unload(Thread* thread) {
if (thread) {
thread->last_running_ticks = system.CoreTiming().GetCPUTicks();
thread->SetIsRunning(false);
if (thread->IsContinuousOnSVC() && !thread->IsHLEThread()) {
system.ArmInterface(core_id).ExceptionalExit();
thread->SetContinuousOnSVC(false);
}
if (!thread->IsHLEThread() && !thread->HasExited()) {
Core::ARM_Interface& 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::Unload() {
Unload(current_thread.get());
}
void Scheduler::Reload(Thread* thread) {
if (thread) {
ASSERT_MSG(thread->GetSchedulingStatus() == ThreadSchedStatus::Runnable,
"Thread must be runnable.");
// Cancel any outstanding wakeup events for this thread
thread->SetIsRunning(true);
thread->SetWasRunning(false);
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()) {
Core::ARM_Interface& 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::Reload() {
Reload(current_thread.get());
}
void Scheduler::SwitchContextStep2() {
// Load context of new thread
Reload(selected_thread.get());
TryDoContextSwitch();
}
void Scheduler::SwitchContext() {
current_thread_prev = current_thread;
selected_thread = selected_thread_set;
Thread* previous_thread = current_thread_prev.get();
Thread* new_thread = selected_thread.get();
current_thread = selected_thread;
is_context_switch_pending = false;
if (new_thread == previous_thread) {
guard.unlock();
return;
}
Process* const previous_process = system.Kernel().CurrentProcess();
UpdateLastContextSwitchTime(previous_thread, previous_process);
// Save context for previous thread
Unload(previous_thread);
std::shared_ptr<Common::Fiber>* old_context;
if (previous_thread != nullptr) {
old_context = &previous_thread->GetHostContext();
} else {
old_context = &idle_thread->GetHostContext();
}
guard.unlock();
Common::Fiber::YieldTo(*old_context, switch_fiber);
/// When a thread wakes up, the scheduler may have changed to other in another core.
auto& next_scheduler = system.Kernel().CurrentScheduler();
next_scheduler.SwitchContextStep2();
}
void Scheduler::OnSwitch(void* this_scheduler) {
Scheduler* sched = static_cast<Scheduler*>(this_scheduler);
sched->SwitchToCurrent();
}
void Scheduler::SwitchToCurrent() {
while (true) {
{
std::scoped_lock lock{guard};
selected_thread = selected_thread_set;
current_thread = selected_thread;
is_context_switch_pending = false;
}
const auto is_switch_pending = [this] {
std::scoped_lock lock{guard};
return is_context_switch_pending;
};
do {
if (current_thread != nullptr && !current_thread->IsHLEThread()) {
current_thread->context_guard.lock();
if (!current_thread->IsRunnable()) {
current_thread->context_guard.unlock();
break;
}
if (static_cast<u32>(current_thread->GetProcessorID()) != core_id) {
current_thread->context_guard.unlock();
break;
}
}
std::shared_ptr<Common::Fiber>* next_context;
if (current_thread != nullptr) {
next_context = &current_thread->GetHostContext();
} else {
next_context = &idle_thread->GetHostContext();
}
Common::Fiber::YieldTo(switch_fiber, *next_context);
} while (!is_switch_pending());
}
}
void Scheduler::UpdateLastContextSwitchTime(Thread* thread, Process* process) {
const u64 prev_switch_ticks = last_context_switch_time;
const u64 most_recent_switch_ticks = system.CoreTiming().GetCPUTicks();
const u64 update_ticks = most_recent_switch_ticks - prev_switch_ticks;
if (thread != nullptr) {
thread->UpdateCPUTimeTicks(update_ticks);
}
if (process != nullptr) {
process->UpdateCPUTimeTicks(update_ticks);
}
last_context_switch_time = most_recent_switch_ticks;
}
void Scheduler::Initialize() {
std::string name = "Idle Thread Id:" + std::to_string(core_id);
std::function<void(void*)> init_func = Core::CpuManager::GetIdleThreadStartFunc();
void* init_func_parameter = system.GetCpuManager().GetStartFuncParamater();
ThreadType type = static_cast<ThreadType>(THREADTYPE_KERNEL | THREADTYPE_HLE | THREADTYPE_IDLE);
auto thread_res = Thread::Create(system, type, name, 0, 64, 0, static_cast<u32>(core_id), 0,
nullptr, std::move(init_func), init_func_parameter);
idle_thread = std::move(thread_res).Unwrap();
}
void Scheduler::Shutdown() {
current_thread = nullptr;
selected_thread = nullptr;
}
SchedulerLock::SchedulerLock(KernelCore& kernel) : kernel{kernel} {
kernel.GlobalScheduler().Lock();
}
SchedulerLock::~SchedulerLock() {
kernel.GlobalScheduler().Unlock();
}
SchedulerLockAndSleep::SchedulerLockAndSleep(KernelCore& kernel, Handle& event_handle,
Thread* time_task, s64 nanoseconds)
: SchedulerLock{kernel}, event_handle{event_handle}, time_task{time_task}, nanoseconds{
nanoseconds} {
event_handle = InvalidHandle;
}
SchedulerLockAndSleep::~SchedulerLockAndSleep() {
if (sleep_cancelled) {
return;
}
auto& time_manager = kernel.TimeManager();
time_manager.ScheduleTimeEvent(event_handle, time_task, nanoseconds);
}
void SchedulerLockAndSleep::Release() {
if (sleep_cancelled) {
return;
}
auto& time_manager = kernel.TimeManager();
time_manager.ScheduleTimeEvent(event_handle, time_task, nanoseconds);
sleep_cancelled = true;
}
} // namespace Kernel

2
src/core/hle/kernel/server_session.cpp
View file

@ -14,9 +14,9 @@
#include "core/hle/kernel/client_session.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/hle_ipc.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/server_session.h"
#include "core/hle/kernel/session.h"
#include "core/hle/kernel/thread.h"

57
src/core/hle/kernel/svc.cpp
View file

@ -24,6 +24,7 @@
#include "core/hle/kernel/client_session.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/memory/memory_block.h"
#include "core/hle/kernel/memory/page_table.h"
@ -32,7 +33,6 @@
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/readable_event.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/shared_memory.h"
#include "core/hle/kernel/svc.h"
#include "core/hle/kernel/svc_types.h"
@ -332,7 +332,8 @@ static ResultCode ConnectToNamedPort32(Core::System& system, Handle* out_handle,
/// Makes a blocking IPC call to an OS service.
static ResultCode SendSyncRequest(Core::System& system, Handle handle) {
const auto& handle_table = system.Kernel().CurrentProcess()->GetHandleTable();
auto& kernel = system.Kernel();
const auto& handle_table = kernel.CurrentProcess()->GetHandleTable();
std::shared_ptr<ClientSession> session = handle_table.Get<ClientSession>(handle);
if (!session) {
LOG_ERROR(Kernel_SVC, "called with invalid handle=0x{:08X}", handle);
@ -341,9 +342,9 @@ static ResultCode SendSyncRequest(Core::System& system, Handle handle) {
LOG_TRACE(Kernel_SVC, "called handle=0x{:08X}({})", handle, session->GetName());
auto thread = system.CurrentScheduler().GetCurrentThread();
auto thread = kernel.CurrentScheduler()->GetCurrentThread();
{
SchedulerLock lock(system.Kernel());
SchedulerLock lock(kernel);
thread->InvalidateHLECallback();
thread->SetStatus(ThreadStatus::WaitIPC);
session->SendSyncRequest(SharedFrom(thread), system.Memory(), system.CoreTiming());
@ -352,12 +353,12 @@ static ResultCode SendSyncRequest(Core::System& system, Handle handle) {
if (thread->HasHLECallback()) {
Handle event_handle = thread->GetHLETimeEvent();
if (event_handle != InvalidHandle) {
auto& time_manager = system.Kernel().TimeManager();
auto& time_manager = kernel.TimeManager();
time_manager.UnscheduleTimeEvent(event_handle);
}
{
SchedulerLock lock(system.Kernel());
SchedulerLock lock(kernel);
auto* sync_object = thread->GetHLESyncObject();
sync_object->RemoveWaitingThread(SharedFrom(thread));
}
@ -665,7 +666,7 @@ static void Break(Core::System& system, u32 reason, u64 info1, u64 info2) {
handle_debug_buffer(info1, info2);
auto* const current_thread = system.CurrentScheduler().GetCurrentThread();
auto* const current_thread = system.Kernel().CurrentScheduler()->GetCurrentThread();
const auto thread_processor_id = current_thread->GetProcessorID();
system.ArmInterface(static_cast<std::size_t>(thread_processor_id)).LogBacktrace();
}
@ -917,7 +918,7 @@ static ResultCode GetInfo(Core::System& system, u64* result, u64 info_id, u64 ha
}
const auto& core_timing = system.CoreTiming();
const auto& scheduler = system.CurrentScheduler();
const auto& scheduler = *system.Kernel().CurrentScheduler();
const auto* const current_thread = scheduler.GetCurrentThread();
const bool same_thread = current_thread == thread.get();
@ -1085,7 +1086,7 @@ static ResultCode SetThreadActivity(Core::System& system, Handle handle, u32 act
return ERR_INVALID_HANDLE;
}
if (thread.get() == system.CurrentScheduler().GetCurrentThread()) {
if (thread.get() == system.Kernel().CurrentScheduler()->GetCurrentThread()) {
LOG_ERROR(Kernel_SVC, "The thread handle specified is the current running thread");
return ERR_BUSY;
}
@ -1118,7 +1119,7 @@ static ResultCode GetThreadContext(Core::System& system, VAddr thread_context, H
return ERR_INVALID_HANDLE;
}
if (thread.get() == system.CurrentScheduler().GetCurrentThread()) {
if (thread.get() == system.Kernel().CurrentScheduler()->GetCurrentThread()) {
LOG_ERROR(Kernel_SVC, "The thread handle specified is the current running thread");
return ERR_BUSY;
}
@ -1475,7 +1476,7 @@ static void ExitProcess(Core::System& system) {
current_process->PrepareForTermination();
// Kill the current thread
system.CurrentScheduler().GetCurrentThread()->Stop();
system.Kernel().CurrentScheduler()->GetCurrentThread()->Stop();
}
static void ExitProcess32(Core::System& system) {
@ -1576,8 +1577,8 @@ static ResultCode StartThread32(Core::System& system, Handle thread_handle) {
static void ExitThread(Core::System& system) {
LOG_DEBUG(Kernel_SVC, "called, pc=0x{:08X}", system.CurrentArmInterface().GetPC());
auto* const current_thread = system.CurrentScheduler().GetCurrentThread();
system.GlobalScheduler().RemoveThread(SharedFrom(current_thread));
auto* const current_thread = system.Kernel().CurrentScheduler()->GetCurrentThread();
system.GlobalSchedulerContext().RemoveThread(SharedFrom(current_thread));
current_thread->Stop();
}
@ -1590,37 +1591,31 @@ static void SleepThread(Core::System& system, s64 nanoseconds) {
LOG_DEBUG(Kernel_SVC, "called nanoseconds={}", nanoseconds);
enum class SleepType : s64 {
YieldWithoutLoadBalancing = 0,
YieldWithLoadBalancing = -1,
YieldWithoutCoreMigration = 0,
YieldWithCoreMigration = -1,
YieldAndWaitForLoadBalancing = -2,
};
auto& scheduler = system.CurrentScheduler();
auto* const current_thread = scheduler.GetCurrentThread();
bool is_redundant = false;
auto& scheduler = *system.Kernel().CurrentScheduler();
if (nanoseconds <= 0) {
switch (static_cast<SleepType>(nanoseconds)) {
case SleepType::YieldWithoutLoadBalancing: {
auto pair = current_thread->YieldSimple();
is_redundant = pair.second;
case SleepType::YieldWithoutCoreMigration: {
scheduler.YieldWithoutCoreMigration();
break;
}
case SleepType::YieldWithLoadBalancing: {
auto pair = current_thread->YieldAndBalanceLoad();
is_redundant = pair.second;
case SleepType::YieldWithCoreMigration: {
scheduler.YieldWithCoreMigration();
break;
}
case SleepType::YieldAndWaitForLoadBalancing: {
auto pair = current_thread->YieldAndWaitForLoadBalancing();
is_redundant = pair.second;
scheduler.YieldToAnyThread();
break;
}
default:
UNREACHABLE_MSG("Unimplemented sleep yield type '{:016X}'!", nanoseconds);
}
} else {
current_thread->Sleep(nanoseconds);
scheduler.GetCurrentThread()->Sleep(nanoseconds);
}
}
@ -1656,8 +1651,8 @@ static ResultCode WaitProcessWideKeyAtomic(Core::System& system, VAddr mutex_add
ASSERT(condition_variable_addr == Common::AlignDown(condition_variable_addr, 4));
auto& kernel = system.Kernel();
Handle event_handle;
Thread* current_thread = system.CurrentScheduler().GetCurrentThread();
auto* const current_process = system.Kernel().CurrentProcess();
Thread* current_thread = kernel.CurrentScheduler()->GetCurrentThread();
auto* const current_process = kernel.CurrentProcess();
{
SchedulerLockAndSleep lock(kernel, event_handle, current_thread, nano_seconds);
const auto& handle_table = current_process->GetHandleTable();
@ -2627,7 +2622,7 @@ void Call(Core::System& system, u32 immediate) {
auto& kernel = system.Kernel();
kernel.EnterSVCProfile();
auto* thread = system.CurrentScheduler().GetCurrentThread();
auto* thread = kernel.CurrentScheduler()->GetCurrentThread();
thread->SetContinuousOnSVC(true);
const FunctionDef* info = system.CurrentProcess()->Is64BitProcess() ? GetSVCInfo64(immediate)

4
src/core/hle/kernel/synchronization.cpp
View file

@ -5,8 +5,8 @@
#include "core/core.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/synchronization.h"
#include "core/hle/kernel/synchronization_object.h"
#include "core/hle/kernel/thread.h"
@ -37,7 +37,7 @@ void Synchronization::SignalObject(SynchronizationObject& obj) const {
std::pair<ResultCode, Handle> Synchronization::WaitFor(
std::vector<std::shared_ptr<SynchronizationObject>>& sync_objects, s64 nano_seconds) {
auto& kernel = system.Kernel();
auto* const thread = system.CurrentScheduler().GetCurrentThread();
auto* const thread = kernel.CurrentScheduler()->GetCurrentThread();
Handle event_handle = InvalidHandle;
{
SchedulerLockAndSleep lock(kernel, event_handle, thread, nano_seconds);

50
src/core/hle/kernel/thread.cpp
View file

@ -17,10 +17,10 @@
#include "core/hardware_properties.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/kernel/time_manager.h"
#include "core/hle/result.h"
@ -186,9 +186,11 @@ ResultVal<std::shared_ptr<Thread>> Thread::Create(Core::System& system, ThreadTy
thread->status = ThreadStatus::Dormant;
thread->entry_point = entry_point;
thread->stack_top = stack_top;
thread->disable_count = 1;
thread->tpidr_el0 = 0;
thread->nominal_priority = thread->current_priority = priority;
thread->last_running_ticks = 0;
thread->schedule_count = -1;
thread->last_scheduled_tick = 0;
thread->processor_id = processor_id;
thread->ideal_core = processor_id;
thread->affinity_mask.SetAffinity(processor_id, true);
@ -201,7 +203,7 @@ ResultVal<std::shared_ptr<Thread>> Thread::Create(Core::System& system, ThreadTy
thread->owner_process = owner_process;
thread->type = type_flags;
if ((type_flags & THREADTYPE_IDLE) == 0) {
auto& scheduler = kernel.GlobalScheduler();
auto& scheduler = kernel.GlobalSchedulerContext();
scheduler.AddThread(thread);
}
if (owner_process) {
@ -402,39 +404,12 @@ ResultCode Thread::Sleep(s64 nanoseconds) {
return RESULT_SUCCESS;
}
std::pair<ResultCode, bool> Thread::YieldSimple() {
bool is_redundant = false;
{
SchedulerLock lock(kernel);
is_redundant = kernel.GlobalScheduler().YieldThread(this);
}
return {RESULT_SUCCESS, is_redundant};
}
std::pair<ResultCode, bool> Thread::YieldAndBalanceLoad() {
bool is_redundant = false;
{
SchedulerLock lock(kernel);
is_redundant = kernel.GlobalScheduler().YieldThreadAndBalanceLoad(this);
}
return {RESULT_SUCCESS, is_redundant};
}
std::pair<ResultCode, bool> Thread::YieldAndWaitForLoadBalancing() {
bool is_redundant = false;
{
SchedulerLock lock(kernel);
is_redundant = kernel.GlobalScheduler().YieldThreadAndWaitForLoadBalancing(this);
}
return {RESULT_SUCCESS, is_redundant};
}
void Thread::AddSchedulingFlag(ThreadSchedFlags flag) {
const u32 old_state = scheduling_state;
pausing_state |= static_cast<u32>(flag);
const u32 base_scheduling = static_cast<u32>(GetSchedulingStatus());
scheduling_state = base_scheduling | pausing_state;
kernel.GlobalScheduler().AdjustSchedulingOnStatus(this, old_state);
KScheduler::OnThreadStateChanged(kernel, this, old_state);
}
void Thread::RemoveSchedulingFlag(ThreadSchedFlags flag) {
@ -442,19 +417,20 @@ void Thread::RemoveSchedulingFlag(ThreadSchedFlags flag) {
pausing_state &= ~static_cast<u32>(flag);
const u32 base_scheduling = static_cast<u32>(GetSchedulingStatus());
scheduling_state = base_scheduling | pausing_state;
kernel.GlobalScheduler().AdjustSchedulingOnStatus(this, old_state);
KScheduler::OnThreadStateChanged(kernel, this, old_state);
}
void Thread::SetSchedulingStatus(ThreadSchedStatus new_status) {
const u32 old_state = scheduling_state;
scheduling_state = (scheduling_state & static_cast<u32>(ThreadSchedMasks::HighMask)) |
static_cast<u32>(new_status);
kernel.GlobalScheduler().AdjustSchedulingOnStatus(this, old_state);
KScheduler::OnThreadStateChanged(kernel, this, old_state);
}
void Thread::SetCurrentPriority(u32 new_priority) {
const u32 old_priority = std::exchange(current_priority, new_priority);
kernel.GlobalScheduler().AdjustSchedulingOnPriority(this, old_priority);
KScheduler::OnThreadPriorityChanged(kernel, this, kernel.CurrentScheduler()->GetCurrentThread(),
old_priority);
}
ResultCode Thread::SetCoreAndAffinityMask(s32 new_core, u64 new_affinity_mask) {
@ -480,10 +456,10 @@ ResultCode Thread::SetCoreAndAffinityMask(s32 new_core, u64 new_affinity_mask) {
if (use_override) {
ideal_core_override = new_core;
} else {
const auto old_affinity_mask = affinity_mask.GetAffinityMask();
const auto old_affinity_mask = affinity_mask;
affinity_mask.SetAffinityMask(new_affinity_mask);
ideal_core = new_core;
if (old_affinity_mask != new_affinity_mask) {
if (old_affinity_mask.GetAffinityMask() != new_affinity_mask) {
const s32 old_core = processor_id;
if (processor_id >= 0 && !affinity_mask.GetAffinity(processor_id)) {
if (static_cast<s32>(ideal_core) < 0) {
@ -493,7 +469,7 @@ ResultCode Thread::SetCoreAndAffinityMask(s32 new_core, u64 new_affinity_mask) {
processor_id = ideal_core;
}
}
kernel.GlobalScheduler().AdjustSchedulingOnAffinity(this, old_affinity_mask, old_core);
KScheduler::OnThreadAffinityMaskChanged(kernel, this, old_affinity_mask, old_core);
}
}
return RESULT_SUCCESS;

107
src/core/hle/kernel/thread.h
View file

@ -28,10 +28,10 @@ class System;
namespace Kernel {
class GlobalScheduler;
class GlobalSchedulerContext;
class KernelCore;
class Process;
class Scheduler;
class KScheduler;
enum ThreadPriority : u32 {
THREADPRIO_HIGHEST = 0, ///< Highest thread priority
@ -346,8 +346,11 @@ public:
void SetStatus(ThreadStatus new_status);
u64 GetLastRunningTicks() const {
return last_running_ticks;
constexpr s64 GetLastScheduledTick() const {
return this->last_scheduled_tick;
}
constexpr void SetLastScheduledTick(s64 tick) {
this->last_scheduled_tick = tick;
}
u64 GetTotalCPUTimeTicks() const {
@ -362,10 +365,18 @@ public:
return processor_id;
}
s32 GetActiveCore() const {
return GetProcessorID();
}
void SetProcessorID(s32 new_core) {
processor_id = new_core;
}
void SetActiveCore(s32 new_core) {
processor_id = new_core;
}
Process* GetOwnerProcess() {
return owner_process;
}
@ -479,21 +490,11 @@ public:
/// Sleeps this thread for the given amount of nanoseconds.
ResultCode Sleep(s64 nanoseconds);
/// Yields this thread without rebalancing loads.
std::pair<ResultCode, bool> YieldSimple();
/// Yields this thread and does a load rebalancing.
std::pair<ResultCode, bool> YieldAndBalanceLoad();
/// Yields this thread and if the core is left idle, loads are rebalanced
std::pair<ResultCode, bool> YieldAndWaitForLoadBalancing();
void IncrementYieldCount() {
yield_count++;
constexpr s64 GetYieldScheduleCount() const {
return this->schedule_count;
}
u64 GetYieldCount() const {
return yield_count;
constexpr void SetYieldScheduleCount(s64 count) {
this->schedule_count = count;
}
ThreadSchedStatus GetSchedulingStatus() const {
@ -569,9 +570,62 @@ public:
return has_exited;
}
struct QueueEntry {
private:
Thread* prev;
Thread* next;
public:
constexpr QueueEntry() : prev(nullptr), next(nullptr) { /* ... */
}
constexpr void Initialize() {
this->prev = nullptr;
this->next = nullptr;
}
constexpr Thread* GetPrev() const {
return this->prev;
}
constexpr Thread* GetNext() const {
return this->next;
}
constexpr void SetPrev(Thread* t) {
this->prev = t;
}
constexpr void SetNext(Thread* t) {
this->next = t;
}
};
constexpr QueueEntry& GetPriorityQueueEntry(s32 core) {
return this->per_core_priority_queue_entry[core];
}
constexpr const QueueEntry& GetPriorityQueueEntry(s32 core) const {
return this->per_core_priority_queue_entry[core];
}
s32 GetDisableDispatchCount() const {
return disable_count;
}
void DisableDispatch() {
ASSERT(GetDisableDispatchCount() >= 0);
disable_count++;
}
void EnableDispatch() {
ASSERT(GetDisableDispatchCount() > 0);
disable_count--;
}
ThreadStatus status = ThreadStatus::Dormant;
u32 scheduling_state = 0;
private:
friend class GlobalScheduler;
friend class Scheduler;
friend class GlobalSchedulerContext;
friend class KScheduler;
friend class Process;
void SetSchedulingStatus(ThreadSchedStatus new_status);
void AddSchedulingFlag(ThreadSchedFlags flag);
@ -586,10 +640,9 @@ private:
u64 thread_id = 0;
ThreadStatus status = ThreadStatus::Dormant;
VAddr entry_point = 0;
VAddr stack_top = 0;
std::atomic_int disable_count = 0;
ThreadType type;
@ -603,9 +656,8 @@ private:
u32 current_priority = 0;
u64 total_cpu_time_ticks = 0; ///< Total CPU running ticks.
u64 last_running_ticks = 0; ///< CPU tick when thread was last running
u64 yield_count = 0; ///< Number of redundant yields carried by this thread.
///< a redundant yield is one where no scheduling is changed
s64 schedule_count{};
s64 last_scheduled_tick{};
s32 processor_id = 0;
@ -647,7 +699,9 @@ private:
Handle hle_time_event;
SynchronizationObject* hle_object;
Scheduler* scheduler = nullptr;
KScheduler* scheduler = nullptr;
QueueEntry per_core_priority_queue_entry[Core::Hardware::NUM_CPU_CORES]{};
u32 ideal_core{0xFFFFFFFF};
KAffinityMask affinity_mask{};
@ -655,7 +709,6 @@ private:
s32 ideal_core_override = -1;
u32 affinity_override_count = 0;
u32 scheduling_state = 0;
u32 pausing_state = 0;
bool is_running = false;
bool is_waiting_on_sync = false;

2
src/core/hle/kernel/time_manager.cpp
View file

@ -7,8 +7,8 @@
#include "core/core_timing.h"
#include "core/core_timing_util.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/kernel/time_manager.h"

2
src/core/hle/service/time/time.cpp
View file

@ -10,8 +10,8 @@
#include "core/hle/ipc_helpers.h"
#include "core/hle/kernel/client_port.h"
#include "core/hle/kernel/client_session.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/service/time/interface.h"
#include "core/hle/service/time/time.h"
#include "core/hle/service/time/time_sharedmemory.h"

6
src/yuzu/debugger/wait_tree.cpp
View file

@ -13,10 +13,10 @@
#include "core/arm/arm_interface.h"
#include "core/core.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/mutex.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/readable_event.h"
#include "core/hle/kernel/scheduler.h"
#include "core/hle/kernel/synchronization_object.h"
#include "core/hle/kernel/thread.h"
#include "core/memory.h"
@ -101,7 +101,7 @@ std::vector<std::unique_ptr<WaitTreeThread>> WaitTreeItem::MakeThreadItemList()
};
const auto& system = Core::System::GetInstance();
add_threads(system.GlobalScheduler().GetThreadList());
add_threads(system.GlobalSchedulerContext().GetThreadList());
return item_list;
}
@ -356,7 +356,7 @@ std::vector<std::unique_ptr<WaitTreeItem>> WaitTreeThread::GetChildren() const {
.arg(thread.GetPriority())
.arg(thread.GetNominalPriority())));
list.push_back(std::make_unique<WaitTreeText>(
tr("last running ticks = %1").arg(thread.GetLastRunningTicks())));
tr("last running ticks = %1").arg(thread.GetLastScheduledTick())));
const VAddr mutex_wait_address = thread.GetMutexWaitAddress();
if (mutex_wait_address != 0) {