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Support Core Migration for Running External Thread 

We did not support migration of threads which were running in a non-cooperative manner, this was partially due to the dependence on per-core conditional variables rather than per-thread which made this harder to do programmatically. This has been fixed by moving to per-thread cvars and therefore the limitation can be removed, this feature is used by Unity games.
This commit is contained in:
PixelyIon 2021-02-18 19:43:29 +05:30 committed by ◱ Mark
parent 198f32de51
commit 20bdda6a63
5 changed files with 91 additions and 47 deletions
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2
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@ -171,7 +171,7 @@
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113
app/src/main/cpp/skyline/kernel/scheduler.cpp
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@ -61,8 +61,9 @@ namespace skyline::kernel {
if (optimalCore != currentCore) {
if (!alwaysInsert && thread == state.thread)
RemoveThread();
else if (!alwaysInsert && thread != state.thread) [[unlikely]]
throw exception("Migrating an external thread (T{}) without 'alwaysInsert' isn't supported", thread->id);
else if (!alwaysInsert && thread != state.thread)
[[unlikely]]
throw exception("Migrating an external thread (T{}) without 'alwaysInsert' isn't supported", thread->id);
thread->coreId = optimalCore->id;
InsertThread(thread);
state.logger->Debug("Load Balancing T{}: C{} -> C{}", thread->id, currentCore->id, optimalCore->id);
@ -121,12 +122,26 @@ namespace skyline::kernel {
void Scheduler::WaitSchedule(bool loadBalance) {
auto &thread{state.thread};
auto *core{&cores.at(thread->coreId)};
CoreContext *core{&cores.at(thread->coreId)};
std::unique_lock lock(core->mutex);
auto wakeFunction{[&]() {
if (!thread->affinityMask.test(thread->coreId)) [[unlikely]] {
lock.unlock();
RemoveThread();
thread->coreId = thread->idealCore;
InsertThread(thread);
core = &cores.at(thread->coreId);
lock = std::unique_lock(core->mutex);
}
return !core->queue.empty() && core->queue.front() == thread;
}};
if (loadBalance && thread->affinityMask.count() > 1) {
std::chrono::milliseconds loadBalanceThreshold{PreemptiveTimeslice * 2}; //!< The amount of time that needs to pass unscheduled for a thread to attempt load balancing
while (!thread->wakeCondition.wait_for(lock, loadBalanceThreshold, [&]() { return !core->queue.empty() && core->queue.front() == thread; })) {
while (!thread->wakeCondition.wait_for(lock, loadBalanceThreshold, wakeFunction)) {
lock.unlock();
LoadBalance(state.thread);
if (thread->coreId == core->id) {
@ -139,7 +154,7 @@ namespace skyline::kernel {
loadBalanceThreshold *= 2; // We double the duration required for future load balancing for this invocation to minimize pointless load balancing
}
} else {
thread->wakeCondition.wait(lock, [&]() { return !core->queue.empty() && core->queue.front() == thread; });
thread->wakeCondition.wait(lock, wakeFunction);
}
if (thread->priority == core->preemptionPriority) {
@ -156,7 +171,19 @@ namespace skyline::kernel {
auto *core{&cores.at(thread->coreId)};
std::unique_lock lock(core->mutex);
if (thread->wakeCondition.wait_for(lock, timeout, [&]() { return !core->queue.empty() && core->queue.front() == thread; })) {
if (thread->wakeCondition.wait_for(lock, timeout, [&]() {
if (!thread->affinityMask.test(thread->coreId)) [[unlikely]] {
lock.unlock();
RemoveThread();
thread->coreId = thread->idealCore;
InsertThread(thread);
core = &cores.at(thread->coreId);
lock = std::unique_lock(core->mutex);
}
return !core->queue.empty() && core->queue.front() == thread;
})) {
if (thread->priority == core->preemptionPriority) {
struct itimerspec spec{.it_value = {.tv_nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(PreemptiveTimeslice).count()}};
timer_settime(thread->preemptionTimer, 0, &spec, nullptr);
@ -182,11 +209,12 @@ namespace skyline::kernel {
// Splice the linked element from the beginning of the queue to where it's priority is present
core.queue.splice(std::upper_bound(core.queue.begin(), core.queue.end(), thread->priority.load(), type::KThread::IsHigherPriority), core.queue, core.queue.begin());
auto& front{core.queue.front()};
auto &front{core.queue.front()};
if (front != thread)
front->wakeCondition.notify_one(); // If we aren't at the front of the queue, only then should we wake the thread at the front up
} else if (!thread->forceYield) { [[unlikely]]
throw exception("T{} called Rotate while not being in C{}'s queue", thread->id, thread->coreId);
} else if (!thread->forceYield) {
[[unlikely]]
throw exception("T{} called Rotate while not being in C{}'s queue", thread->id, thread->coreId);
}
thread->averageTimeslice = (thread->averageTimeslice / 4) + (3 * (util::GetTimeTicks() - thread->timesliceStart / 4));
@ -202,6 +230,34 @@ namespace skyline::kernel {
thread->forceYield = false;
}
void Scheduler::RemoveThread() {
auto &thread{state.thread};
auto &core{cores.at(thread->coreId)};
{
std::unique_lock lock(core.mutex);
auto it{std::find(core.queue.begin(), core.queue.end(), thread)};
if (it != core.queue.end()) {
it = core.queue.erase(it);
if (it == core.queue.begin()) {
// We need to update the averageTimeslice accordingly, if we've been unscheduled by this
if (thread->timesliceStart)
thread->averageTimeslice = (thread->averageTimeslice / 4) + (3 * (util::GetTimeTicks() - thread->timesliceStart / 4));
if (it != core.queue.end())
(*it)->wakeCondition.notify_one(); // We need to wake the thread at the front of the queue, if we were at the front previously
}
}
}
if (thread->isPreempted) {
struct itimerspec spec{};
timer_settime(thread->preemptionTimer, 0, &spec, nullptr);
thread->isPreempted = false;
}
YieldPending = false;
}
void Scheduler::UpdatePriority(const std::shared_ptr<type::KThread> &thread) {
std::lock_guard migrationLock(thread->coreMigrationMutex);
auto *core{&cores.at(thread->coreId)};
@ -254,6 +310,15 @@ namespace skyline::kernel {
}
}
void Scheduler::UpdateCore(const std::shared_ptr<type::KThread> &thread) {
auto *core{&cores.at(thread->coreId)};
std::unique_lock coreLock(core->mutex);
if (core->queue.front() == thread)
thread->SendSignal(YieldSignal);
else
thread->wakeCondition.notify_one();
}
void Scheduler::ParkThread() {
auto &thread{state.thread};
std::lock_guard migrationLock(thread->coreMigrationMutex);
@ -293,32 +358,4 @@ namespace skyline::kernel {
}
}
}
void Scheduler::RemoveThread() {
auto &thread{state.thread};
auto &core{cores.at(thread->coreId)};
{
std::unique_lock lock(core.mutex);
auto it{std::find(core.queue.begin(), core.queue.end(), thread)};
if (it != core.queue.end()) {
it = core.queue.erase(it);
if (it == core.queue.begin()) {
// We need to update the averageTimeslice accordingly, if we've been unscheduled by this
if (thread->timesliceStart)
thread->averageTimeslice = (thread->averageTimeslice / 4) + (3 * (util::GetTimeTicks() - thread->timesliceStart / 4));
if (it != core.queue.end())
(*it)->wakeCondition.notify_one(); // We need to wake the thread at the front of the queue, if we were at the front previously
}
}
}
if (thread->isPreempted) {
struct itimerspec spec{};
timer_settime(thread->preemptionTimer, 0, &spec, nullptr);
thread->isPreempted = false;
}
YieldPending = false;
}
}

16
app/src/main/cpp/skyline/kernel/scheduler.h
View File

@ -103,11 +103,22 @@ namespace skyline {
*/
void Rotate(bool cooperative = true);
/**
* @brief Removes the calling thread from it's resident core queue
*/
void RemoveThread();
/**
* @brief Updates the placement of the supplied thread in it's resident core's queue according to it's new priority
*/
void UpdatePriority(const std::shared_ptr<type::KThread>& thread);
/**
* @brief Updates the core that the supplied thread is resident to according to it's new affinity mask and ideal core
* @note This supports changing the core of a thread which is currently running
*/
void UpdateCore(const std::shared_ptr<type::KThread>& thread);
/**
* @brief Parks the calling thread after removing it from it's resident core's queue and inserts it on the core it's been awoken on
* @note This will not handle waiting for the thread to be scheduled, this should be followed with a call to WaitSchedule/TimedWaitSchedule
@ -119,11 +130,6 @@ namespace skyline {
* @note We will only wake a thread if it is determined to be a better pick than the thread which would be run on this core next
*/
void WakeParkedThread();
/**
* @brief Removes the calling thread from it's resident core queue
*/
void RemoveThread();
};
/**

5
app/src/main/cpp/skyline/kernel/svc.cpp
View File

@ -412,10 +412,11 @@ namespace skyline::kernel::svc {
state.logger->Debug("svcSetThreadCoreMask: Setting thread #{}'s Ideal Core ({}) + Affinity Mask ({})", thread->id, idealCore, affinityMask);
std::lock_guard guard(thread->coreMigrationMutex);
thread->idealCore = idealCore;
thread->affinityMask = affinityMask;
if (!affinityMask.test(thread->coreId)) {
if (!affinityMask.test(thread->coreId) && thread->coreId != constant::ParkedCoreId) {
state.logger->Debug("svcSetThreadCoreMask: Migrating thread #{} to Ideal Core C{} -> C{}", thread->id, thread->coreId, idealCore);
if (thread == state.thread) {
@ -425,7 +426,7 @@ namespace skyline::kernel::svc {
} else if (!thread->running) {
thread->coreId = idealCore;
} else {
throw exception("svcSetThreadCoreMask: Migrating a running thread due to a new core mask is not supported");
state.scheduler->UpdateCore(thread);
}
}

2
app/src/main/cpp/skyline/kernel/types/KThread.h
View File

@ -41,7 +41,7 @@ namespace skyline {
u64 entryArgument;
void *stackTop;
std::condition_variable_any wakeCondition; //!< A conditional variable which is signalled to wake the current thread while it's sleeping
std::condition_variable wakeCondition; //!< A conditional variable which is signalled to wake the current thread while it's sleeping
std::atomic<u8> basePriority; //!< The priority of the thread for the scheduler without any priority-inheritance
std::atomic<u8> priority; //!< The priority of the thread for the scheduler
i8 idealCore; //!< The ideal CPU core for this thread to run on