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CPU: improve cpu_thread::suspend_all (TSX) 

Try to make more clever busy-waiting on cpu_flag::pause.
This commit is contained in:
Nekotekina 2020-10-29 19:29:35 +03:00
parent 95dbcf2fd7
commit d5667a859a
1 changed files with 25 additions and 21 deletions
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46
rpcs3/Emu/CPU/CPUThread.cpp
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@ -592,15 +592,11 @@ bool cpu_thread::check_state() noexcept
{
bool store = false;
// Easy way obtain suspend counter
if (flags & cpu_flag::pause && !(flags & cpu_flag::wait))
{
// Save value before state is saved and cpu_flag::wait is observed
susp_ctr = g_suspend_counter;
}
else
{
susp_ctr = -1;
}
if (flags & cpu_flag::temp) [[unlikely]]
{
@ -710,18 +706,38 @@ bool cpu_thread::check_state() noexcept
// If only cpu_flag::pause was set, wait on suspend counter instead
if (state0 & cpu_flag::pause)
{
if (state0 & cpu_flag::wait)
{
// Otherwise, value must be reliable because cpu_flag::wait hasn't been observed yet
susp_ctr = -1;
}
// Hard way
if (susp_ctr == umax)
if (susp_ctr == umax) [[unlikely]]
{
g_fxo->get<cpu_counter>()->cpu_suspend_lock.lock_unlock();
continue;
}
// Wait for current suspend_all operation
while (busy_wait(), g_suspend_counter == susp_ctr)
for (u64 i = 0;; i++)
{
g_suspend_counter.wait(susp_ctr);
if (i < 20)
{
busy_wait(300);
}
else
{
g_suspend_counter.wait(susp_ctr);
}
if (!(state & cpu_flag::pause))
{
break;
}
}
susp_ctr = -1;
}
}
}
@ -808,9 +824,6 @@ bool cpu_thread::suspend_work::push(cpu_thread* _this, bool cancel_if_not_suspen
// Can't allow pre-set wait bit (it'd be a problem)
verify(HERE), !_this || !(_this->state & cpu_flag::wait);
// Value must be reliable because cpu_flag::wait hasn't been observed only (but not if pause is set)
const u64 susp_ctr = g_suspend_counter;
// cpu_counter object
const auto ctr = g_fxo->get<cpu_counter>();
@ -881,8 +894,6 @@ bool cpu_thread::suspend_work::push(cpu_thread* _this, bool cancel_if_not_suspen
// Check only CPUs which haven't acknowledged their waiting state yet
for_all_cpu<true>([&](cpu_thread* cpu, u64 index)
{
verify(HERE), cpu->state & cpu_flag::pause;
if (cpu->state & cpu_flag::wait)
{
ctr->cpu_copy_bits[index / 64] &= ~(1ull << (index % 64));
@ -951,14 +962,7 @@ bool cpu_thread::suspend_work::push(cpu_thread* _this, bool cancel_if_not_suspen
else
{
// Seems safe to set pause on self because wait flag hasn't been observed yet
_this->state += cpu_flag::pause + cpu_flag::wait;
// Subscribe for notification broadcast
while (busy_wait(), g_suspend_counter == susp_ctr)
{
g_suspend_counter.wait(susp_ctr);
}
_this->state += cpu_flag::pause + cpu_flag::temp;
_this->check_state();
return true;
}