Merge pull request #683 from bunnei/thread-priority
Thread priority and scheduler improvements
This commit is contained in:
bunnei
commit
6f1143885b
9 changed files with 147 additions and 41 deletions
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@ -40,6 +40,18 @@ struct ThreadQueueList {
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return -1;
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}
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T get_first() {
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Queue *cur = first;
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while (cur != nullptr) {
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if (!cur->data.empty()) {
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return cur->data.front();
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}
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cur = cur->next_nonempty;
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}
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return T();
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}
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T pop_first() {
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Queue *cur = first;
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while (cur != nullptr) {
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@ -79,6 +91,12 @@ struct ThreadQueueList {
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cur->data.push_back(thread_id);
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}
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void move(const T& thread_id, Priority old_priority, Priority new_priority) {
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remove(old_priority, thread_id);
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prepare(new_priority);
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push_back(new_priority, thread_id);
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}
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void remove(Priority priority, const T& thread_id) {
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Queue *cur = &queues[priority];
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boost::remove_erase(cur->data, thread_id);
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@ -46,6 +46,13 @@ template<ResultCode func(u32*, u32, u32, u32, u32, u32)> void Wrap(){
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FuncReturn(retval);
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}
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template<ResultCode func(u32*, s32, u32, u32, u32, s32)> void Wrap() {
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u32 param_1 = 0;
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u32 retval = func(¶m_1, PARAM(0), PARAM(1), PARAM(2), PARAM(3), PARAM(4)).raw;
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Core::g_app_core->SetReg(1, param_1);
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FuncReturn(retval);
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}
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template<ResultCode func(s32*, u32*, s32, bool, s64)> void Wrap() {
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s32 param_1 = 0;
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s32 retval = func(¶m_1, (Handle*)Memory::GetPointer(PARAM(1)), (s32)PARAM(2),
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@ -46,14 +46,12 @@ ResultCode AddressArbiter::ArbitrateAddress(ArbitrationType type, VAddr address,
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case ArbitrationType::WaitIfLessThan:
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if ((s32)Memory::Read32(address) <= value) {
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Kernel::WaitCurrentThread_ArbitrateAddress(address);
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HLE::Reschedule(__func__);
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}
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break;
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case ArbitrationType::WaitIfLessThanWithTimeout:
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if ((s32)Memory::Read32(address) <= value) {
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Kernel::WaitCurrentThread_ArbitrateAddress(address);
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GetCurrentThread()->WakeAfterDelay(nanoseconds);
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HLE::Reschedule(__func__);
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}
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break;
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case ArbitrationType::DecrementAndWaitIfLessThan:
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@ -62,7 +60,6 @@ ResultCode AddressArbiter::ArbitrateAddress(ArbitrationType type, VAddr address,
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Memory::Write32(address, memory_value);
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if (memory_value <= value) {
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Kernel::WaitCurrentThread_ArbitrateAddress(address);
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HLE::Reschedule(__func__);
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}
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break;
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}
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@ -73,7 +70,6 @@ ResultCode AddressArbiter::ArbitrateAddress(ArbitrationType type, VAddr address,
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if (memory_value <= value) {
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Kernel::WaitCurrentThread_ArbitrateAddress(address);
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GetCurrentThread()->WakeAfterDelay(nanoseconds);
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HLE::Reschedule(__func__);
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}
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break;
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}
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@ -154,7 +154,7 @@ void Shutdown() {
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*/
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bool LoadExec(u32 entry_point) {
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// 0x30 is the typical main thread priority I've seen used so far
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g_main_thread = Kernel::SetupMainThread(Kernel::DEFAULT_STACK_SIZE, entry_point, 0x30);
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g_main_thread = Kernel::SetupMainThread(Kernel::DEFAULT_STACK_SIZE, entry_point, THREADPRIO_DEFAULT);
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return true;
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}
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@ -56,7 +56,15 @@ SharedPtr<Mutex> Mutex::Create(bool initial_locked, std::string name) {
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}
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bool Mutex::ShouldWait() {
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return lock_count > 0 && holding_thread != GetCurrentThread();;
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auto thread = GetCurrentThread();
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bool wait = lock_count > 0 && holding_thread != thread;
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// If the holding thread of the mutex is lower priority than this thread, that thread should
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// temporarily inherit this thread's priority
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if (wait && thread->current_priority < holding_thread->current_priority)
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holding_thread->BoostPriority(thread->current_priority);
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return wait;
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}
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void Mutex::Acquire() {
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@ -140,6 +140,28 @@ void ArbitrateAllThreads(u32 address) {
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}
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}
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/// Boost low priority threads (temporarily) that have been starved
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static void PriorityBoostStarvedThreads() {
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u64 current_ticks = CoreTiming::GetTicks();
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for (auto& thread : thread_list) {
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// TODO(bunnei): Threads that have been waiting to be scheduled for `boost_ticks` (or
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// longer) will have their priority temporarily adjusted to 1 higher than the highest
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// priority thread to prevent thread starvation. This general behavior has been verified
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// on hardware. However, this is almost certainly not perfect, and the real CTR OS scheduler
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// should probably be reversed to verify this.
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const u64 boost_timeout = 2000000; // Boost threads that have been ready for > this long
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u64 delta = current_ticks - thread->last_running_ticks;
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if (thread->status == THREADSTATUS_READY && delta > boost_timeout && !thread->idle) {
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const s32 priority = std::max(ready_queue.get_first()->current_priority - 1, 0);
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thread->BoostPriority(priority);
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}
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}
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}
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/**
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* Switches the CPU's active thread context to that of the specified thread
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* @param new_thread The thread to switch to
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@ -151,6 +173,7 @@ static void SwitchContext(Thread* new_thread) {
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// Save context for previous thread
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if (previous_thread) {
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previous_thread->last_running_ticks = CoreTiming::GetTicks();
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Core::g_app_core->SaveContext(previous_thread->context);
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if (previous_thread->status == THREADSTATUS_RUNNING) {
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@ -168,6 +191,9 @@ static void SwitchContext(Thread* new_thread) {
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ready_queue.remove(new_thread->current_priority, new_thread);
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new_thread->status = THREADSTATUS_RUNNING;
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// Restores thread to its nominal priority if it has been temporarily changed
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new_thread->current_priority = new_thread->nominal_priority;
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Core::g_app_core->LoadContext(new_thread->context);
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} else {
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current_thread = nullptr;
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@ -364,7 +390,8 @@ ResultVal<SharedPtr<Thread>> Thread::Create(std::string name, VAddr entry_point,
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thread->status = THREADSTATUS_DORMANT;
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thread->entry_point = entry_point;
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thread->stack_top = stack_top;
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thread->initial_priority = thread->current_priority = priority;
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thread->nominal_priority = thread->current_priority = priority;
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thread->last_running_ticks = CoreTiming::GetTicks();
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thread->processor_id = processor_id;
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thread->wait_set_output = false;
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thread->wait_all = false;
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@ -400,17 +427,15 @@ static void ClampPriority(const Thread* thread, s32* priority) {
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void Thread::SetPriority(s32 priority) {
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ClampPriority(this, &priority);
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if (current_priority == priority) {
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return;
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}
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if (status == THREADSTATUS_READY) {
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// If thread was ready, adjust queues
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ready_queue.remove(current_priority, this);
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ready_queue.prepare(priority);
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ready_queue.push_back(priority, this);
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if (status == THREADSTATUS_READY)
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ready_queue.move(this, current_priority, priority);
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nominal_priority = current_priority = priority;
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}
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void Thread::BoostPriority(s32 priority) {
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ready_queue.move(this, current_priority, priority);
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current_priority = priority;
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}
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@ -440,6 +465,9 @@ SharedPtr<Thread> SetupMainThread(u32 stack_size, u32 entry_point, s32 priority)
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void Reschedule() {
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Thread* prev = GetCurrentThread();
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PriorityBoostStarvedThreads();
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Thread* next = PopNextReadyThread();
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HLE::g_reschedule = false;
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@ -17,17 +17,19 @@
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/result.h"
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enum ThreadPriority {
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enum ThreadPriority : s32{
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THREADPRIO_HIGHEST = 0, ///< Highest thread priority
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THREADPRIO_DEFAULT = 16, ///< Default thread priority for userland apps
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THREADPRIO_LOW = 31, ///< Low range of thread priority for userland apps
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THREADPRIO_LOWEST = 63, ///< Thread priority max checked by svcCreateThread
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THREADPRIO_USERLAND_MAX = 24, ///< Highest thread priority for userland apps
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THREADPRIO_DEFAULT = 48, ///< Default thread priority for userland apps
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THREADPRIO_LOWEST = 63, ///< Lowest thread priority
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};
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enum ThreadProcessorId {
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THREADPROCESSORID_0 = 0xFFFFFFFE, ///< Enables core appcode
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THREADPROCESSORID_1 = 0xFFFFFFFD, ///< Enables core syscore
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THREADPROCESSORID_ALL = 0xFFFFFFFC, ///< Enables both cores
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enum ThreadProcessorId : s32 {
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THREADPROCESSORID_DEFAULT = -2, ///< Run thread on default core specified by exheader
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THREADPROCESSORID_ALL = -1, ///< Run thread on either core
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THREADPROCESSORID_0 = 0, ///< Run thread on core 0 (AppCore)
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THREADPROCESSORID_1 = 1, ///< Run thread on core 1 (SysCore)
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THREADPROCESSORID_MAX = 2, ///< Processor ID must be less than this
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};
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enum ThreadStatus {
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@ -87,6 +89,12 @@ public:
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*/
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void SetPriority(s32 priority);
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/**
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* Temporarily boosts the thread's priority until the next time it is scheduled
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* @param priority The new priority
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*/
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void BoostPriority(s32 priority);
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/**
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* Gets the thread's thread ID
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* @return The thread's ID
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@ -135,8 +143,10 @@ public:
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u32 entry_point;
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u32 stack_top;
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s32 initial_priority;
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s32 current_priority;
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s32 nominal_priority; ///< Nominal thread priority, as set by the emulated application
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s32 current_priority; ///< Current thread priority, can be temporarily changed
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u64 last_running_ticks; ///< CPU tick when thread was last running
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s32 processor_id;
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@ -32,7 +32,8 @@ static Kernel::SharedPtr<Kernel::SharedMemory> shared_font_mem = nullptr;
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static Kernel::SharedPtr<Kernel::Mutex> lock = nullptr;
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static Kernel::SharedPtr<Kernel::Event> notification_event = nullptr; ///< APT notification event
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static Kernel::SharedPtr<Kernel::Event> pause_event = nullptr; ///< APT pause event
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static Kernel::SharedPtr<Kernel::Event> start_event = nullptr; ///< APT start event
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static std::vector<u8> shared_font;
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static u32 cpu_percent = 0; ///< CPU time available to the running application
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@ -44,11 +45,11 @@ void Initialize(Service::Interface* self) {
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cmd_buff[2] = 0x04000000; // According to 3dbrew, this value should be 0x04000000
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cmd_buff[3] = Kernel::g_handle_table.Create(notification_event).MoveFrom();
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cmd_buff[4] = Kernel::g_handle_table.Create(pause_event).MoveFrom();
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cmd_buff[4] = Kernel::g_handle_table.Create(start_event).MoveFrom();
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// TODO(bunnei): Check if these events are cleared/signaled every time Initialize is called.
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// TODO(bunnei): Check if these events are cleared every time Initialize is called.
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notification_event->Clear();
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pause_event->Signal(); // Fire start event
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start_event->Clear();
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ASSERT_MSG((nullptr != lock), "Cannot initialize without lock");
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lock->Release();
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@ -81,7 +82,7 @@ void NotifyToWait(Service::Interface* self) {
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u32* cmd_buff = Kernel::GetCommandBuffer();
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u32 app_id = cmd_buff[1];
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// TODO(Subv): Verify this, it seems to get SWKBD and Home Menu further.
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pause_event->Signal();
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start_event->Signal();
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cmd_buff[1] = RESULT_SUCCESS.raw; // No error
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LOG_WARNING(Service_APT, "(STUBBED) app_id=%u", app_id);
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@ -312,7 +313,7 @@ void Init() {
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// TODO(bunnei): Check if these are created in Initialize or on APT process startup.
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notification_event = Kernel::Event::Create(RESETTYPE_ONESHOT, "APT_U:Notification");
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pause_event = Kernel::Event::Create(RESETTYPE_ONESHOT, "APT_U:Pause");
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start_event = Kernel::Event::Create(RESETTYPE_ONESHOT, "APT_U:Start");
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}
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void Shutdown() {
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@ -283,8 +283,13 @@ static ResultCode ArbitrateAddress(Handle handle, u32 address, u32 type, u32 val
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if (arbiter == nullptr)
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return ERR_INVALID_HANDLE;
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return arbiter->ArbitrateAddress(static_cast<Kernel::ArbitrationType>(type),
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auto res = arbiter->ArbitrateAddress(static_cast<Kernel::ArbitrationType>(type),
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address, value, nanoseconds);
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if (res == RESULT_SUCCESS)
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HLE::Reschedule(__func__);
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return res;
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}
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/// Used to output a message on a debug hardware unit - does nothing on a retail unit
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@ -312,7 +317,7 @@ static ResultCode GetResourceLimitCurrentValues(s64* values, Handle resource_lim
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}
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/// Creates a new thread
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static ResultCode CreateThread(u32* out_handle, u32 priority, u32 entry_point, u32 arg, u32 stack_top, u32 processor_id) {
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static ResultCode CreateThread(Handle* out_handle, s32 priority, u32 entry_point, u32 arg, u32 stack_top, s32 processor_id) {
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using Kernel::Thread;
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std::string name;
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@ -323,6 +328,27 @@ static ResultCode CreateThread(u32* out_handle, u32 priority, u32 entry_point, u
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name = Common::StringFromFormat("unknown-%08x", entry_point);
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}
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// TODO(bunnei): Implement resource limits to return an error code instead of the below assert.
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// The error code should be: Description::NotAuthorized, Module::OS, Summary::WrongArgument,
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// Level::Permanent
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ASSERT_MSG(priority >= THREADPRIO_USERLAND_MAX, "Unexpected thread priority!");
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if (priority > THREADPRIO_LOWEST) {
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return ResultCode(ErrorDescription::OutOfRange, ErrorModule::OS,
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ErrorSummary::InvalidArgument, ErrorLevel::Usage);
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}
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switch (processor_id) {
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case THREADPROCESSORID_DEFAULT:
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case THREADPROCESSORID_0:
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case THREADPROCESSORID_1:
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break;
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default:
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// TODO(bunnei): Implement support for other processor IDs
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ASSERT_MSG(false, "Unsupported thread processor ID: %d", processor_id);
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break;
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}
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CASCADE_RESULT(SharedPtr<Thread> thread, Kernel::Thread::Create(
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name, entry_point, priority, arg, processor_id, stack_top));
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CASCADE_RESULT(*out_handle, Kernel::g_handle_table.Create(std::move(thread)));
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@ -331,10 +357,7 @@ static ResultCode CreateThread(u32* out_handle, u32 priority, u32 entry_point, u
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"threadpriority=0x%08X, processorid=0x%08X : created handle=0x%08X", entry_point,
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name.c_str(), arg, stack_top, priority, processor_id, *out_handle);
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if (THREADPROCESSORID_1 == processor_id) {
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LOG_WARNING(Kernel_SVC,
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"thread designated for system CPU core (UNIMPLEMENTED) will be run with app core scheduling");
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}
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HLE::Reschedule(__func__);
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return RESULT_SUCCESS;
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}
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@ -374,8 +397,11 @@ static ResultCode CreateMutex(Handle* out_handle, u32 initial_locked) {
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SharedPtr<Mutex> mutex = Mutex::Create(initial_locked != 0);
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CASCADE_RESULT(*out_handle, Kernel::g_handle_table.Create(std::move(mutex)));
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HLE::Reschedule(__func__);
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LOG_TRACE(Kernel_SVC, "called initial_locked=%s : created handle=0x%08X",
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initial_locked ? "true" : "false", *out_handle);
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return RESULT_SUCCESS;
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}
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@ -390,6 +416,9 @@ static ResultCode ReleaseMutex(Handle handle) {
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return ERR_INVALID_HANDLE;
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mutex->Release();
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HLE::Reschedule(__func__);
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return RESULT_SUCCESS;
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}
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@ -428,6 +457,9 @@ static ResultCode ReleaseSemaphore(s32* count, Handle handle, s32 release_count)
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return ERR_INVALID_HANDLE;
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CASCADE_RESULT(*count, semaphore->Release(release_count));
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HLE::Reschedule(__func__);
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return RESULT_SUCCESS;
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}
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@ -520,6 +552,9 @@ static ResultCode SetTimer(Handle handle, s64 initial, s64 interval) {
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return ERR_INVALID_HANDLE;
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timer->Set(initial, interval);
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HLE::Reschedule(__func__);
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return RESULT_SUCCESS;
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}
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@ -534,6 +569,9 @@ static ResultCode CancelTimer(Handle handle) {
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return ERR_INVALID_HANDLE;
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timer->Cancel();
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HLE::Reschedule(__func__);
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return RESULT_SUCCESS;
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}
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