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CPU preemption control: avoidance in reservation operations

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Eladash 2022-09-14 19:45:11 +03:00 committed by Ivan
parent 3cebea1801
commit b6d3fa8c66
1 changed files with 17 additions and 0 deletions
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17
rpcs3/Emu/CPU/CPUThread.cpp
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@ -898,6 +898,23 @@ bool cpu_thread::check_state() noexcept
if (state0 & cpu_flag::yield && cpu_flag::wait - state0)
{
if (auto spu = try_get<spu_thread>())
{
if (spu->raddr && spu->rtime == vm::reservation_acquire(spu->raddr) && spu->getllar_spin_count < 10)
{
// Reservation operation is a critical section (but this may result in false positives)
continue;
}
}
else if (auto ppu = try_get<ppu_thread>())
{
if (ppu->raddr && ppu->rtime == vm::reservation_acquire(ppu->raddr))
{
// Same
continue;
}
}
// Short sleep when yield flag is present alone (makes no sense when other methods which can stop thread execution have been done)
// Pass a mask of a single bit which is often unused to avoid notifications
s_dummy_atomic.wait(0, 1u << 30, atomic_wait_timeout{80'000});