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Support Priority & Affinity Mask Changes

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◱ PixelyIon 2020-12-11 01:06:00 +05:30 committed by ◱ Mark
parent f41bcd1e22
commit 7ba7cd2394
7 changed files with 106 additions and 41 deletions
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74
app/src/main/cpp/skyline/kernel/scheduler.cpp
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@ -24,6 +24,7 @@ namespace skyline::kernel {
Scheduler::CoreContext &Scheduler::LoadBalance() {
auto &thread{state.thread};
std::lock_guard migrationLock(thread->coreMigrationMutex);
auto *currentCore{&cores.at(thread->coreId)};
if (!currentCore->queue.empty() && thread->affinityMask.count() != 1) {
@ -37,7 +38,7 @@ namespace skyline::kernel {
u64 timeslice{};
if (!candidateCore.queue.empty()) {
std::shared_lock lock(candidateCore.mutex);
std::shared_lock coreLock(candidateCore.mutex);
auto threadIterator{candidateCore.queue.cbegin()};
if (threadIterator != candidateCore.queue.cend()) {
@ -60,21 +61,21 @@ namespace skyline::kernel {
}
if (optimalCore != currentCore) {
std::unique_lock lock(currentCore->mutex);
std::unique_lock coreLock(currentCore->mutex);
currentCore->queue.erase(std::remove(currentCore->queue.begin(), currentCore->queue.end(), thread), currentCore->queue.end());
currentCore->mutateCondition.notify_all();
thread->coreId = optimalCore->id;
state.logger->Debug("Load Balancing for #{}: C{} -> C{}", thread->id, currentCore->id, optimalCore->id);
state.logger->Debug("Load Balancing: C{} -> C{}", currentCore->id, optimalCore->id);
} else {
state.logger->Debug("Load Balancing for #{}: C{} (Late)", thread->id, currentCore->id);
state.logger->Debug("Load Balancing: C{} (Late)", currentCore->id);
}
return *optimalCore;
}
state.logger->Debug("Load Balancing for #{}: C{} (Early)", thread->id, currentCore->id);
state.logger->Debug("Load Balancing: C{} (Early)", currentCore->id);
return *currentCore;
}
@ -97,12 +98,14 @@ namespace skyline::kernel {
std::unique_lock lock(core.mutex);
auto nextThread{std::find_if(core.queue.begin(), core.queue.end(), [&](const std::shared_ptr<type::KThread> &it) { return it->priority > thread->priority; })};
if (nextThread == core.queue.begin() && nextThread != core.queue.end()) {
// If the inserted thread has a higher priority than the currently running thread (and the queue isn't empty)
core.queue.front()->SendSignal(YieldSignal);
core.queue.insert(std::next(core.queue.begin()), thread);
} else {
core.queue.insert(nextThread, thread);
core.mutateCondition.notify_all(); // We only want to trigger the conditional variable if the current thread isn't going to be scheduled next
}
thread->needsReorder = true; // We need to reorder the thread from back to align it with other threads of it's priority and ensure strict ordering amongst priorities
}
void Scheduler::WaitSchedule() {
@ -147,18 +150,71 @@ namespace skyline::kernel {
thread->averageTimeslice = (thread->averageTimeslice / 4) + (3 * (util::GetTimeTicks() - thread->timesliceStart / 4)); // 0.25 * old timeslice duration + 0.75 * current timeslice duration
core.queue.pop_front();
core.queue.push_back(thread);
if (!thread->needsReorder) {
core.queue.push_back(thread);
} else if (core.queue.size() > 1 && core.queue.back()->priority > thread->priority) {
// If 'needsReorder' is set, the core queue isn't empty nor has only one member and the thread at the back of the queue has a lower priority than the current one
// We can attempt to reorder this thread, this is done by doing a priority-aware insert with the search starting at the "folding point"
// The folding point is where a thread has a lower priority than the one succeeding it in the queue, this is where a new "sequence" starts from highest to lowest priorities
u8 lastPriority{core.queue.front()->priority};
auto foldingPoint{std::find_if(std::next(core.queue.begin()), core.queue.end(), [&](const std::shared_ptr<type::KThread> &it) {
return lastPriority > it->priority ? true : lastPriority = it->priority, false;
})};
core.queue.insert(std::find_if(foldingPoint, core.queue.end(), [&](const std::shared_ptr<type::KThread> &it) { return it->priority > thread->priority; }), thread);
thread->needsReorder = false;
} else {
core.queue.push_back(thread);
thread->needsReorder = false;
}
core.mutateCondition.notify_all();
if (cooperative && thread->isPreempted) {
// If a preemptive thread did a cooperative yield then we need to disarm the preemptive timer
struct itimerspec spec{};
timer_settime(*thread->preemptionTimer, 0, &spec, nullptr);
}
thread->isPreempted = false;
}
}
void Scheduler::UpdatePriority(const std::shared_ptr<type::KThread>& thread) {
std::lock_guard migrationLock(thread->coreMigrationMutex);
auto *core{&cores.at(thread->coreId)};
std::unique_lock coreLock(core->mutex);
auto currentIt{std::find(core->queue.begin(), core->queue.end(), thread)};
if (currentIt == core->queue.end() || currentIt == core->queue.begin())
// If the thread isn't in the queue then the new priority will be handled automatically on insertion
return;
if (currentIt == core->queue.begin()) {
// Alternatively, if it's currently running then we'd just want to update after it rotates
thread->needsReorder = true;
return;
}
if (cooperative && thread->isPreempted) {
// If a preemptive thread did a cooperative yield then we need to disarm the preemptive timer
auto targetIt{std::find_if(core->queue.begin(), core->queue.end(), [&](const std::shared_ptr<type::KThread> &it) { return it->priority > thread->priority; })};
if (currentIt == targetIt)
// If this thread's position isn't affected by the priority change then we have nothing to do
return;
core->queue.erase(currentIt);
if (thread->isPreempted && thread->priority != core->preemptionPriority) {
struct itimerspec spec{};
timer_settime(*thread->preemptionTimer, 0, &spec, nullptr);
thread->isPreempted = false;
}
thread->isPreempted = false;
targetIt = std::find_if(core->queue.begin(), core->queue.end(), [&](const std::shared_ptr<type::KThread> &it) { return it->priority > thread->priority; }); // Iterator invalidation
if (targetIt == core->queue.begin() && targetIt != core->queue.end()) {
core->queue.front()->SendSignal(YieldSignal);
core->queue.insert(std::next(core->queue.begin()), thread);
} else {
core->queue.insert(targetIt, thread);
core->mutateCondition.notify_all();
}
thread->needsReorder = true;
}
void Scheduler::RemoveThread() {

5
app/src/main/cpp/skyline/kernel/scheduler.h
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@ -91,6 +91,11 @@ namespace skyline {
*/
void Rotate(bool cooperative = true);
/**
* @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 Removes the calling thread from it's resident core queue
*/

37
app/src/main/cpp/skyline/kernel/svc.cpp
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@ -309,7 +309,7 @@ namespace skyline::kernel::svc {
KHandle handle{state.ctx->gpr.w1};
try {
auto thread{state.process->GetHandle<type::KThread>(handle)};
auto priority{thread->priority};
u8 priority{thread->priority};
state.logger->Debug("svcGetThreadPriority: Retrieving thread #{}'s priority: {}", thread->id, priority);
state.ctx->gpr.w1 = priority;
@ -331,7 +331,8 @@ namespace skyline::kernel::svc {
try {
auto thread{state.process->GetHandle<type::KThread>(handle)};
state.logger->Debug("svcSetThreadPriority: Setting thread priority to {}", thread->id, priority);
thread->UpdatePriority(static_cast<u8>(priority));
thread->priority = priority;
state.scheduler->UpdatePriority(thread);
state.ctx->gpr.w0 = Result{};
} catch (const std::out_of_range &) {
state.logger->Warn("svcSetThreadPriority: 'handle' invalid: 0x{:X}", handle);
@ -358,18 +359,18 @@ namespace skyline::kernel::svc {
void SetThreadCoreMask(const DeviceState &state) {
KHandle handle{state.ctx->gpr.w0};
i32 coreId{static_cast<i32>(state.ctx->gpr.w1)};
i32 idealCore{static_cast<i32>(state.ctx->gpr.w1)};
CoreMask affinityMask{state.ctx->gpr.x2};
try {
auto thread{state.process->GetHandle<type::KThread>(handle)};
if (coreId == IdealCoreUseProcessValue) {
coreId = state.process->npdm.meta.idealCore;
affinityMask.reset().set(coreId);
} else if (coreId == IdealCoreNoUpdate) {
coreId = thread->idealCore;
} else if (coreId == IdealCoreDontCare) {
coreId = __builtin_ctzll(affinityMask.to_ullong()); // The first enabled core in the affinity mask
if (idealCore == IdealCoreUseProcessValue) {
idealCore = state.process->npdm.meta.idealCore;
affinityMask.reset().set(idealCore);
} else if (idealCore == IdealCoreNoUpdate) {
idealCore = thread->idealCore;
} else if (idealCore == IdealCoreDontCare) {
idealCore = __builtin_ctzll(affinityMask.to_ullong()); // The first enabled core in the affinity mask
}
auto processMask{state.process->npdm.threadInfo.coreMask};
@ -379,17 +380,25 @@ namespace skyline::kernel::svc {
return;
}
if (affinityMask.none() || !affinityMask.test(coreId)) {
state.logger->Warn("svcSetThreadCoreMask: 'affinityMask' invalid: {} (Ideal Core: {})", affinityMask, coreId);
if (affinityMask.none() || !affinityMask.test(idealCore)) {
state.logger->Warn("svcSetThreadCoreMask: 'affinityMask' invalid: {} (Ideal Core: {})", affinityMask, idealCore);
state.ctx->gpr.w0 = result::InvalidCombination;
return;
}
state.logger->Debug("svcSetThreadCoreMask: Setting thread #{}'s Ideal Core ({}) + Affinity Mask ({})", thread->id, coreId, affinityMask);
state.logger->Debug("svcSetThreadCoreMask: Setting thread #{}'s Ideal Core ({}) + Affinity Mask ({})", thread->id, idealCore, affinityMask);
thread->idealCore = coreId;
thread->idealCore = idealCore;
thread->affinityMask = affinityMask;
if (!affinityMask.test(thread->coreId)) {
state.logger->Debug("svcSetThreadCoreMask: Migrating to Ideal Core C{} -> C{}", thread->coreId, idealCore);
state.scheduler->RemoveThread();
thread->coreId = idealCore;
state.scheduler->InsertThread(false);
}
state.ctx->gpr.w0 = Result{};
} catch (const std::out_of_range &) {
state.logger->Warn("svcSetThreadCoreMask: 'handle' invalid: 0x{:X}", handle);

8
app/src/main/cpp/skyline/kernel/types/KProcess.cpp
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@ -6,9 +6,9 @@
#include "KProcess.h"
namespace skyline::kernel::type {
KProcess::WaitStatus::WaitStatus(i8 priority, KHandle handle) : priority(priority), handle(handle) {}
KProcess::WaitStatus::WaitStatus(u8 priority, KHandle handle) : priority(priority), handle(handle) {}
KProcess::WaitStatus::WaitStatus(i8 priority, KHandle handle, u32 *mutex) : priority(priority), handle(handle), mutex(mutex) {}
KProcess::WaitStatus::WaitStatus(u8 priority, KHandle handle, u32 *mutex) : priority(priority), handle(handle), mutex(mutex) {}
KProcess::TlsPage::TlsPage(const std::shared_ptr<KPrivateMemory> &memory) : memory(memory) {}
@ -74,7 +74,7 @@ namespace skyline::kernel::type {
return tlsPage->ReserveSlot();
}
std::shared_ptr<KThread> KProcess::CreateThread(void *entry, u64 argument, void *stackTop, i8 priority, i8 idealCore) {
std::shared_ptr<KThread> KProcess::CreateThread(void *entry, u64 argument, void *stackTop, std::optional<u8> priority, std::optional<u8> idealCore) {
std::lock_guard guard(threadMutex);
if (disableThreadCreation)
return nullptr;
@ -84,7 +84,7 @@ namespace skyline::kernel::type {
throw exception("Failed to create guard page for thread stack at 0x{:X}", mainThreadStack->ptr);
stackTop = mainThreadStack->ptr + mainThreadStack->size;
}
auto thread{NewHandle<KThread>(this, threads.size(), entry, argument, stackTop, (priority == -1) ? state.process->npdm.meta.mainThreadPriority : priority, (idealCore == -1) ? state.process->npdm.meta.idealCore : idealCore).item};
auto thread{NewHandle<KThread>(this, threads.size(), entry, argument, stackTop, priority ? *priority : state.process->npdm.meta.mainThreadPriority, idealCore ? *idealCore : state.process->npdm.meta.idealCore).item};
threads.push_back(thread);
return thread;
}

8
app/src/main/cpp/skyline/kernel/types/KProcess.h
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@ -29,13 +29,13 @@ namespace skyline {
private:
struct WaitStatus {
std::atomic_bool flag{false};
i8 priority;
u8 priority;
KHandle handle;
u32 *mutex{};
WaitStatus(i8 priority, KHandle handle);
WaitStatus(u8 priority, KHandle handle);
WaitStatus(i8 priority, KHandle handle, u32 *mutex);
WaitStatus(u8 priority, KHandle handle, u32 *mutex);
};
std::unordered_map<u64, std::vector<std::shared_ptr<WaitStatus>>> mutexes; //!< A map from a mutex's address to a vector of Mutex objects for threads waiting on it
@ -105,7 +105,7 @@ namespace skyline {
* @return A shared pointer to a KThread initialized with the specified values or nullptr, if thread creation has been disabled
* @note The default values are for the main thread and will use values from the NPDM
*/
std::shared_ptr<KThread> CreateThread(void *entry, u64 argument = 0, void *stackTop = nullptr, i8 priority = -1, i8 idealCore = -1);
std::shared_ptr<KThread> CreateThread(void *entry, u64 argument = 0, void *stackTop = nullptr, std::optional<u8> priority = std::nullopt, std::optional<u8> idealCore = std::nullopt);
/**
* @brief The output for functions that return created kernel objects

7
app/src/main/cpp/skyline/kernel/types/KThread.cpp
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@ -10,9 +10,8 @@
#include "KThread.h"
namespace skyline::kernel::type {
KThread::KThread(const DeviceState &state, KHandle handle, KProcess *parent, size_t id, void *entry, u64 argument, void *stackTop, i8 priority, i8 idealCore) : handle(handle), parent(parent), id(id), entry(entry), entryArgument(argument), stackTop(stackTop), idealCore(idealCore), coreId(idealCore), KSyncObject(state, KType::KThread) {
KThread::KThread(const DeviceState &state, KHandle handle, KProcess *parent, size_t id, void *entry, u64 argument, void *stackTop, u8 priority, i8 idealCore) : handle(handle), parent(parent), id(id), entry(entry), entryArgument(argument), stackTop(stackTop), priority(priority), idealCore(idealCore), coreId(idealCore), KSyncObject(state, KType::KThread) {
affinityMask.set(coreId);
UpdatePriority(priority);
}
KThread::~KThread() {
@ -197,8 +196,4 @@ namespace skyline::kernel::type {
if (running)
pthread_kill(pthread, signal);
}
void KThread::UpdatePriority(i8 priority) {
this->priority = priority;
}
}

8
app/src/main/cpp/skyline/kernel/types/KThread.h
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@ -38,7 +38,7 @@ namespace skyline {
u64 entryArgument;
void *stackTop;
i8 priority;
std::atomic<u8> priority; //!< The priority of the thread for the scheduler
i8 idealCore; //!< The ideal CPU core for this thread to run on
i8 coreId; //!< The CPU core on which this thread is running
CoreMask affinityMask{}; //!< A mask of CPU cores this thread is allowed to run on
@ -46,8 +46,10 @@ namespace skyline {
u64 averageTimeslice{}; //!< A weighted average of the timeslice duration for this thread
std::optional<timer_t> preemptionTimer{}; //!< A kernel timer used for preemption interrupts
bool isPreempted{}; //!< If the preemption timer has been armed and will fire
bool needsReorder{}; //!< If the thread needs to reorder itself during scheduler rotation
std::mutex coreMigrationMutex; //!< Synchronizes operations which depend on which core the thread is running on
KThread(const DeviceState &state, KHandle handle, KProcess *parent, size_t id, void *entry, u64 argument, void *stackTop, i8 priority, i8 idealCore);
KThread(const DeviceState &state, KHandle handle, KProcess *parent, size_t id, void *entry, u64 argument, void *stackTop, u8 priority, i8 idealCore);
~KThread();
@ -67,8 +69,6 @@ namespace skyline {
* @brief Sends a host OS signal to the thread which is running this KThread
*/
void SendSignal(int signal);
void UpdatePriority(i8 priority);
};
}
}