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Improve core timing accuracy (#5257)

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* Improve core timing accuracy

* remove wrong global_ticks, use biggest ticks over all cores for GetGlobalTicks

* merge max slice length change
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Ben 2020-05-12 22:48:30 +02:00 • committed by GitHub
parent d11d600b61
commit 57aa18f52e
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 62 additions and 28 deletions
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27
src/core/core.cpp
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@ -148,7 +148,11 @@ System::ResultStatus System::RunLoop(bool tight_loop) {
for (auto& cpu_core : cpu_cores) {
if (cpu_core->GetTimer().GetTicks() < global_ticks) {
s64 delay = global_ticks - cpu_core->GetTimer().GetTicks();
cpu_core->GetTimer().Advance(delay);
kernel->SetRunningCPU(cpu_core.get());
cpu_core->GetTimer().Advance();
cpu_core->PrepareReschedule();
kernel->GetThreadManager(cpu_core->GetID()).Reschedule();
cpu_core->GetTimer().SetNextSlice(delay);
if (max_delay < delay) {
max_delay = delay;
current_core_to_execute = cpu_core.get();
@ -156,10 +160,14 @@ System::ResultStatus System::RunLoop(bool tight_loop) {
}
}
if (max_delay > 0) {
// jit sometimes overshoot by a few ticks which might lead to a minimal desync in the cores.
// This small difference shouldn't make it necessary to sync the cores and would only cost
// performance. Thus we don't sync delays below min_delay
static constexpr s64 min_delay = 100;
if (max_delay > min_delay) {
LOG_TRACE(Core_ARM11, "Core {} running (delayed) for {} ticks",
current_core_to_execute->GetID(),
current_core_to_execute->GetTimer().GetDowncount());
current_core_to_execute->GetID(),
current_core_to_execute->GetTimer().GetDowncount());
if (running_core != current_core_to_execute) {
running_core = current_core_to_execute;
kernel->SetRunningCPU(running_core);
@ -181,12 +189,15 @@ System::ResultStatus System::RunLoop(bool tight_loop) {
// TODO: Make special check for idle since we can easily revert the time of idle cores
s64 max_slice = Timing::MAX_SLICE_LENGTH;
for (const auto& cpu_core : cpu_cores) {
kernel->SetRunningCPU(cpu_core.get());
cpu_core->GetTimer().Advance();
cpu_core->PrepareReschedule();
kernel->GetThreadManager(cpu_core->GetID()).Reschedule();
max_slice = std::min(max_slice, cpu_core->GetTimer().GetMaxSliceLength());
}
for (auto& cpu_core : cpu_cores) {
cpu_core->GetTimer().Advance(max_slice);
}
for (auto& cpu_core : cpu_cores) {
cpu_core->GetTimer().SetNextSlice(max_slice);
auto start_ticks = cpu_core->GetTimer().GetTicks();
LOG_TRACE(Core_ARM11, "Core {} running for {} ticks", cpu_core->GetID(),
cpu_core->GetTimer().GetDowncount());
running_core = cpu_core.get();
@ -204,8 +215,8 @@ System::ResultStatus System::RunLoop(bool tight_loop) {
cpu_core->Step();
}
}
max_slice = cpu_core->GetTimer().GetTicks() - start_ticks;
}
timing->AddToGlobalTicks(max_slice);
}
if (GDBStub::IsServerEnabled()) {