Atmosphere/libraries/libmesosphere/source/kern_k_scheduler.cpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern {
namespace {
class KSchedulerInterruptTask : public KInterruptTask {
public:
constexpr KSchedulerInterruptTask() : KInterruptTask() { /* ... */ }
virtual KInterruptTask *OnInterrupt(s32 interrupt_id) override {
return GetDummyInterruptTask();
}
virtual void DoTask() override {
MESOSPHERE_PANIC("KSchedulerInterruptTask::DoTask was called!");
}
};
ALWAYS_INLINE void IncrementScheduledCount(KThread *thread) {
if (KProcess *parent = thread->GetOwnerProcess(); parent != nullptr) {
/* TODO: parent->IncrementScheduledCount(); */
}
}
KSchedulerInterruptTask g_scheduler_interrupt_task;
ALWAYS_INLINE auto *GetSchedulerInterruptTask() {
return std::addressof(g_scheduler_interrupt_task);
}
}
void KScheduler::Initialize(KThread *idle_thread) {
/* Set core ID and idle thread. */
this->core_id = GetCurrentCoreId();
this->idle_thread = idle_thread;
this->state.idle_thread_stack = this->idle_thread->GetStackTop();
/* Insert the main thread into the priority queue. */
{
KScopedSchedulerLock lk;
GetPriorityQueue().PushBack(GetCurrentThreadPointer());
SetSchedulerUpdateNeeded();
}
/* Bind interrupt handler. */
Kernel::GetInterruptManager().BindHandler(GetSchedulerInterruptTask(), KInterruptName_Scheduler, this->core_id, KInterruptController::PriorityLevel_Scheduler, false, false);
}
void KScheduler::Activate() {
MESOSPHERE_ASSERT(GetCurrentThread().GetDisableDispatchCount() == 1);
this->state.should_count_idle = false /* TODO: Retrieve from KSystemControl. */;
this->is_active = true;
RescheduleCurrentCore();
}
void KScheduler::RescheduleOtherCores(u64 cores_needing_scheduling) {
if (const u64 core_mask = cores_needing_scheduling & ~(1ul << this->core_id); core_mask != 0) {
cpu::DataSynchronizationBarrier();
Kernel::GetInterruptManager().SendInterProcessorInterrupt(KInterruptName_Scheduler, core_mask);
}
}
u64 KScheduler::UpdateHighestPriorityThread(KThread *highest_thread) {
if (KThread *prev_highest_thread = this->state.highest_priority_thread; AMS_LIKELY(prev_highest_thread != highest_thread)) {
if (AMS_LIKELY(prev_highest_thread != nullptr)) {
IncrementScheduledCount(prev_highest_thread);
prev_highest_thread->SetLastScheduledTick(KHardwareTimer::GetTick());
}
if (this->state.should_count_idle) {
if (AMS_LIKELY(highest_thread != nullptr)) {
/* TODO: Set parent process's idle count if it exists. */
} else {
this->state.idle_count++;
}
}
this->state.highest_priority_thread = highest_thread;
this->state.needs_scheduling = true;
return (1ul << this->core_id);
} else {
return 0;
}
}
u64 KScheduler::UpdateHighestPriorityThreadsImpl() {
MESOSPHERE_ASSERT(IsSchedulerLockedByCurrentThread());
/* Clear that we need to update. */
ClearSchedulerUpdateNeeded();
u64 cores_needing_scheduling = 0, idle_cores = 0;
KThread *top_threads[cpu::NumCores];
auto &priority_queue = GetPriorityQueue();
/* 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 < cpu::NumCores; core_id++) {
KThread *top_thread = priority_queue.GetScheduledFront(core_id);
if (top_thread != nullptr) {
/* If the thread has no waiters, we might prefer a suggestion from the owner process to it. */
if (top_thread->GetNumKernelWaiters() == 0) {
if (KProcess *parent = top_thread->GetOwnerProcess(); parent != nullptr) {
if (KThread *suggested = parent->GetSuggestedTopThread(core_id); suggested != nullptr && suggested != top_thread) {
/* We prefer our parent's suggestion whenever possible. However, we also don't want to schedule un-runnable threads. */
if (suggested->GetRawThreadState() == KThread::ThreadState_Runnable) {
top_thread = suggested;
} else {
top_thread = nullptr;
}
}
}
}
} else {
idle_cores |= (1ul << core_id);
}
top_threads[core_id] = top_thread;
cores_needing_scheduling |= Kernel::GetScheduler(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) {
s32 core_id = __builtin_ctzll(idle_cores);
if (KThread *suggested = priority_queue.GetSuggestedFront(core_id); suggested != nullptr) {
s32 migration_candidates[cpu::NumCores];
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 (KThread *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::GetScheduler(core_id).UpdateHighestPriorityThread(top_threads[core_id]);
break;
}
/* Note this core as a candidate for migration. */
MESOSPHERE_ASSERT(num_candidates < cpu::NumCores);
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 (KThread *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::GetScheduler(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::GetScheduler(core_id).UpdateHighestPriorityThread(top_threads[core_id]);
break;
}
}
}
}
idle_cores &= ~(1ul << core_id);
}
return cores_needing_scheduling;
}
void KScheduler::SetInterruptTaskThreadRunnable() {
MESOSPHERE_ASSERT(GetCurrentThread().GetDisableDispatchCount() == 1);
KThread *task_thread = Kernel::GetInterruptTaskManager().GetThread();
{
KScopedSchedulerLock sl;
if (AMS_LIKELY(task_thread->GetThreadState() == KThread::ThreadState_Waiting)) {
task_thread->SetState(KThread::ThreadState_Runnable);
}
}
}
void KScheduler::SwitchThread(KThread *next_thread) {
KProcess *cur_process = GetCurrentProcessPointer();
KThread *cur_thread = GetCurrentThreadPointer();
/* We never want to schedule a null thread, so use the idle thread if we don't have a next. */
if (next_thread == nullptr) {
next_thread = this->idle_thread;
}
/* If we're not actually switching thread, there's nothing to do. */
if (next_thread == cur_thread) {
return;
}
/* Next thread is now known not to be nullptr, and must not be dispatchable. */
MESOSPHERE_ASSERT(next_thread->GetDisableDispatchCount() == 1);
/* Update the CPU time tracking variables. */
const s64 prev_tick = this->last_context_switch_time;
const s64 cur_tick = KHardwareTimer::GetTick();
const s64 tick_diff = cur_tick - prev_tick;
cur_thread->AddCpuTime(tick_diff);
if (cur_process != nullptr) {
/* TODO: cur_process->AddCpuTime(tick_diff); */
}
this->last_context_switch_time = cur_tick;
/* Update our previous thread. */
if (cur_process != nullptr) {
/* NOTE: Combining this into AMS_LIKELY(!... && ...) triggers an internal compiler error: Segmentation fault in GCC 9.2.0. */
if (AMS_LIKELY(!cur_thread->IsTerminationRequested()) && AMS_LIKELY(cur_thread->GetActiveCore() == this->core_id)) {
this->prev_thread = cur_thread;
} else {
this->prev_thread = nullptr;
}
} else if (cur_thread == this->idle_thread) {
this->prev_thread = nullptr;
}
/* Switch the current process, if we're switching processes. */
if (KProcess *next_process = next_thread->GetOwnerProcess(); next_process != cur_process) {
/* TODO: KProcess::Switch */
}
/* Set the new Thread Local region. */
cpu::SwitchThreadLocalRegion(GetInteger(next_thread->GetThreadLocalRegionAddress()));
}
void KScheduler::OnThreadStateChanged(KThread *thread, KThread::ThreadState old_state) {
MESOSPHERE_ASSERT(IsSchedulerLockedByCurrentThread());
/* Check if the state has changed, because if it hasn't there's nothing to do. */
const KThread::ThreadState cur_state = thread->GetRawThreadState();
if (cur_state == old_state) {
return;
}
/* Update the priority queues. */
if (old_state == KThread::ThreadState_Runnable) {
/* If we were previously runnable, then we're not runnable now, and we should remove. */
GetPriorityQueue().Remove(thread);
IncrementScheduledCount(thread);
SetSchedulerUpdateNeeded();
} else if (cur_state == KThread::ThreadState_Runnable) {
/* If we're now runnable, then we weren't previously, and we should add. */
GetPriorityQueue().PushBack(thread);
IncrementScheduledCount(thread);
SetSchedulerUpdateNeeded();
}
}
void KScheduler::OnThreadPriorityChanged(KThread *thread, s32 old_priority) {
MESOSPHERE_ASSERT(IsSchedulerLockedByCurrentThread());
/* If the thread is runnable, we want to change its priority in the queue. */
if (thread->GetRawThreadState() == KThread::ThreadState_Runnable) {
GetPriorityQueue().ChangePriority(old_priority, thread == GetCurrentThreadPointer(), thread);
IncrementScheduledCount(thread);
SetSchedulerUpdateNeeded();
}
}
void KScheduler::OnThreadAffinityMaskChanged(KThread *thread, const KAffinityMask &old_affinity, s32 old_core) {
MESOSPHERE_ASSERT(IsSchedulerLockedByCurrentThread());
/* If the thread is runnable, we want to change its affinity in the queue. */
if (thread->GetRawThreadState() == KThread::ThreadState_Runnable) {
GetPriorityQueue().ChangeAffinityMask(old_core, old_affinity, thread);
IncrementScheduledCount(thread);
SetSchedulerUpdateNeeded();
}
}
}