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Scheduler: Add protections for Yield bombing

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In case of redundant yields, the scheduler will now idle the core for 
it's timeslice, in order to avoid continuously yielding the same thing 
over and over.
This commit is contained in:
Fernando Sahmkow
2019-09-10 10:23:43 -04:00
committed by FernandoS27
parent 82218c925a
commit 103f3a2fe5
5 changed files with 31 additions and 24 deletions
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13
src/core/hle/kernel/svc.cpp
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@ -1556,17 +1556,18 @@ static void SleepThread(Core::System& system, s64 nanoseconds) {
auto& scheduler = system.CurrentScheduler();
auto* const current_thread = scheduler.GetCurrentThread();
bool redundant = false;
if (nanoseconds <= 0) {
switch (static_cast<SleepType>(nanoseconds)) {
case SleepType::YieldWithoutLoadBalancing:
current_thread->YieldSimple();
redundant = current_thread->YieldSimple();
break;
case SleepType::YieldWithLoadBalancing:
current_thread->YieldAndBalanceLoad();
redundant = current_thread->YieldAndBalanceLoad();
break;
case SleepType::YieldAndWaitForLoadBalancing:
current_thread->YieldAndWaitForLoadBalancing();
redundant = current_thread->YieldAndWaitForLoadBalancing();
break;
default:
UNREACHABLE_MSG("Unimplemented sleep yield type '{:016X}'!", nanoseconds);
@ -1575,7 +1576,11 @@ static void SleepThread(Core::System& system, s64 nanoseconds) {
current_thread->Sleep(nanoseconds);
}
system.PrepareReschedule(current_thread->GetProcessorID());
if (redundant) {
system.CoreTiming().Idle();
} else {
system.PrepareReschedule(current_thread->GetProcessorID());
}
}
/// Wait process wide key atomic