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Use per-thread scheduler condvars and clean up AS filters 

Per-thread condvars previously caused issues due to an audren bug, now
that's fixed they have a clear performance benefit.
This commit is contained in:
◱ PixelyIon 2021-02-10 10:41:09 +00:00 committed by ◱ Mark
parent 2bbf526419
commit 7e7a792dc5
7 changed files with 19 additions and 19 deletions
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4
.idea/scopes/SkylineKotlin.xml
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@ -1,3 +1,3 @@
<component name="DependencyValidationManager">
<scope name="SkylineKotlin" pattern="file[Skyline.app]:src/main/java//*.kt" />
</component>
<scope name="SkylineKotlin" pattern="file[skyline.app]:src/main/java//*.kt" />
</component>

4
.idea/scopes/SkylineLibraries.xml
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@ -1,3 +1,3 @@
<component name="DependencyValidationManager">
<scope name="SkylineLibraries" pattern="file[app]:libraries//*" />
</component>
<scope name="SkylineLibraries" pattern="file[skyline.app]:libraries//*" />
</component>

4
.idea/scopes/SkylineNative.xml
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@ -1,3 +1,3 @@
<component name="DependencyValidationManager">
<scope name="SkylineNative" pattern="file[Skyline.app]:src/main/cpp//*.cpp||file[Skyline.app]:src/main/cpp//*.h||file[Skyline.app]:src/main/cpp//*.S" />
</component>
<scope name="SkylineNative" pattern="file[skyline.app]:src/main/cpp//*.cpp||file[skyline.app]:src/main/cpp//*.h||file[skyline.app]:src/main/cpp//*.S" />
</component>

4
.idea/scopes/SkylineXml.xml
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@ -1,3 +1,3 @@
<component name="DependencyValidationManager">
<scope name="SkylineXml" pattern="file[app]:src/main/res/layout/*||file[app]:src/main/res/menu/*||file[app]:src/main/res/values/*||file[app]:src/main/res/values-night/*||file[app]:src/main/res/xml/*" />
</component>
<scope name="SkylineXml" pattern="file[skyline.app]:src/main/res/layout/*||file[app]:src/main/res/menu/*||file[skyline.app]:src/main/res/values/*||file[skyline.app]:src/main/res/values-night/*||file[skyline.app]:src/main/res/xml/*" />
</component>

19
app/src/main/cpp/skyline/kernel/scheduler.cpp
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@ -113,7 +113,7 @@ namespace skyline::kernel {
core.queue.push_front(thread);
}
if (thread != state.thread)
core.frontCondition.notify_all(); // We only want to trigger the conditional variable if the current thread isn't inserting itself
thread->wakeCondition.notify_one(); // We only want to trigger the conditional variable if the current thread isn't inserting itself
} else {
core.queue.insert(nextThread, thread);
}
@ -126,7 +126,7 @@ namespace skyline::kernel {
std::unique_lock lock(core->mutex);
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 (!core->frontCondition.wait_for(lock, loadBalanceThreshold, [&]() { return !core->queue.empty() && core->queue.front() == thread; })) {
while (!thread->wakeCondition.wait_for(lock, loadBalanceThreshold, [&]() { return !core->queue.empty() && core->queue.front() == thread; })) {
lock.unlock();
LoadBalance(state.thread);
if (thread->coreId == core->id) {
@ -139,7 +139,7 @@ namespace skyline::kernel {
loadBalanceThreshold *= 2; // We double the duration required for future load balancing for this invocation to minimize pointless load balancing
}
} else {
core->frontCondition.wait(lock, [&]() { return !core->queue.empty() && core->queue.front() == thread; });
thread->wakeCondition.wait(lock, [&]() { return !core->queue.empty() && core->queue.front() == thread; });
}
if (thread->priority == core->preemptionPriority) {
@ -156,7 +156,7 @@ namespace skyline::kernel {
auto *core{&cores.at(thread->coreId)};
std::unique_lock lock(core->mutex);
if (core->frontCondition.wait_for(lock, timeout, [&]() { return !core->queue.empty() && core->queue.front() == thread; })) {
if (thread->wakeCondition.wait_for(lock, timeout, [&]() { 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);
@ -182,8 +182,9 @@ 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());
if (core.queue.front() != thread)
core.frontCondition.notify_all(); // If we aren't at the front of the queue, only then should we wake the thread at the front up
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);
}
@ -267,7 +268,7 @@ namespace skyline::kernel {
if (thread->coreId == constant::ParkedCoreId) {
std::unique_lock lock(parkedMutex);
parkedQueue.insert(std::upper_bound(parkedQueue.begin(), parkedQueue.end(), thread->priority.load(), type::KThread::IsHigherPriority), thread);
parkedFrontCondition.wait(lock, [&]() { return parkedQueue.front() == thread && thread->coreId != constant::ParkedCoreId; });
thread->wakeCondition.wait(lock, [&]() { return parkedQueue.front() == thread && thread->coreId != constant::ParkedCoreId; });
}
InsertThread(thread);
@ -288,7 +289,7 @@ namespace skyline::kernel {
if (parkedThread->priority < thread->priority || (parkedThread->priority == thread->priority && (!nextThread || parkedThread->timesliceStart < nextThread->timesliceStart))) {
parkedThread->coreId = thread->coreId;
parkedLock.unlock();
parkedFrontCondition.notify_all();
parkedThread->wakeCondition.notify_one();
}
}
}
@ -307,7 +308,7 @@ namespace skyline::kernel {
thread->averageTimeslice = (thread->averageTimeslice / 4) + (3 * (util::GetTimeTicks() - thread->timesliceStart / 4));
if (it != core.queue.end())
core.frontCondition.notify_all(); // We need to wake the thread at the front of the queue, if we were at the front previously
(*it)->wakeCondition.notify_one(); // We need to wake the thread at the front of the queue, if we were at the front previously
}
}
}

2
app/src/main/cpp/skyline/kernel/scheduler.h
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@ -47,7 +47,6 @@ namespace skyline {
u8 id;
u8 preemptionPriority; //!< The priority at which this core becomes preemptive as opposed to cooperative
std::mutex mutex; //!< Synchronizes all operations on the queue
std::condition_variable frontCondition; //!< A conditional variable which is signalled when the front of the parked queue has changed
std::list<std::shared_ptr<type::KThread>> queue; //!< A queue of threads which are running or to be run on this core
CoreContext(u8 id, u8 preemptionPriority);
@ -56,7 +55,6 @@ namespace skyline {
std::array<CoreContext, constant::CoreCount> cores{CoreContext(0, 59), CoreContext(1, 59), CoreContext(2, 59), CoreContext(3, 63)};
std::mutex parkedMutex; //!< Synchronizes all operations on the queue of parked threads
std::condition_variable parkedFrontCondition; //!< A conditional variable which is signalled when the front of the parked queue has changed
std::list<std::shared_ptr<type::KThread>> parkedQueue; //!< A queue of threads which are parked and waiting on core migration
public:

1
app/src/main/cpp/skyline/kernel/types/KThread.h
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@ -41,6 +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::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