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CPU preemption control: try to minimize sleep time gaps between setups

This commit is contained in:
Eladash 2022-09-13 22:16:16 +03:00 committed by Ivan
parent 9c5108c1ca
commit 9d1ec0b319
1 changed files with 5 additions and 2 deletions
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7
rpcs3/Emu/CPU/CPUThread.cpp
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@ -642,6 +642,8 @@ void cpu_thread::cpu_wait(bs_t<cpu_flag> old)
thread_ctrl::wait_on(state, old);
}
static atomic_t<u32> s_dummy_atomic = 0;
bool cpu_thread::check_state() noexcept
{
bool cpu_sleep_called = false;
@ -782,7 +784,7 @@ bool cpu_thread::check_state() noexcept
if (cpu_flag::wait - state0)
{
// Yield itself
state.wait(state1, atomic_wait_timeout{20'000});
s_dummy_atomic.wait(0, 1u << 30, atomic_wait_timeout{80'000});
}
if (const u128 bits = s_cpu_bits)
@ -896,7 +898,8 @@ bool cpu_thread::check_state() noexcept
if (state0 & cpu_flag::yield && cpu_flag::wait - state0)
{
// Short sleep when yield flag is present alone (makes no sense when other methods which can stop thread execution have been done)
state.wait(state1, atomic_wait_timeout{20'000});
// 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});
}
}
}