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SPU Add ability to specify percentage of busy waiting

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Eladash 2022-08-20 10:29:02 +03:00 • committed by Ivan
parent ddba30988b
commit bf63a18c5f
3 changed files with 27 additions and 7 deletions
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29
rpcs3/Emu/Cell/SPUThread.cpp
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@ -3437,8 +3437,24 @@ bool spu_thread::process_mfc_cmd()
// 2. Increase the chance of change detection: if GETLLAR has been called again new data is probably wanted
if (!g_cfg.core.spu_accurate_getllar || (rtime == vm::reservation_acquire(addr) && cmp_rdata(rdata, data)))
{
// Validation that it is indeed GETLLAR busy-waiting (large time window is intentional)
if ((g_cfg.core.spu_reservation_busy_waiting && !g_use_rtm) || last_getllar != pc || perf0.get() - last_gtsc >= 50'000)
if ([&]() -> bool
{
// Validation that it is indeed GETLLAR spinning (large time window is intentional)
if (last_getllar != pc || perf0.get() - last_gtsc >= 50'000)
{
// Seemingly not
getllar_busy_waiting_switch = umax;
return true;
}
if (getllar_busy_waiting_switch == umax)
{
// Evalute its value (shift-right to ensure its randomness with different CPUs)
getllar_busy_waiting_switch = !g_use_rtm && ((perf0.get() >> 8) % 100 < g_cfg.core.spu_reservation_busy_waiting_percentage);
}
return !!getllar_busy_waiting_switch;
}())
{
if (g_cfg.core.mfc_debug)
{
@ -3451,7 +3467,7 @@ bool spu_thread::process_mfc_cmd()
last_getllar = pc;
last_gtsc = perf0.get();
if (g_cfg.core.spu_reservation_busy_waiting)
if (getllar_busy_waiting_switch == true)
{
busy_wait();
}
@ -3578,6 +3594,7 @@ bool spu_thread::process_mfc_cmd()
mov_rdata(_ref<spu_rdata_t>(ch_mfc_cmd.lsa & 0x3ff80), rdata);
last_getllar = pc;
last_gtsc = perf0.get();
getllar_busy_waiting_switch = umax;
ch_atomic_stat.set_value(MFC_GETLLAR_SUCCESS);
@ -4250,6 +4267,8 @@ s64 spu_thread::get_ch_value(u32 ch)
}
}
const bool reservation_busy_waiting = !g_use_rtm && ((utils::get_tsc() >> 8) % 100) < g_cfg.core.spu_reservation_busy_waiting_percentage;
for (; !events.count; events = get_events(mask1 & ~SPU_EVENT_LR, true, true))
{
const auto old = +state;
@ -4275,10 +4294,10 @@ s64 spu_thread::get_ch_value(u32 ch)
continue;
}
if (raddr)
if (raddr && (mask1 & ~SPU_EVENT_TM) == SPU_EVENT_LR)
{
// Don't busy-wait with TSX - memory is sensitive
if (g_use_rtm || !g_cfg.core.spu_reservation_busy_waiting)
if (!reservation_busy_waiting)
{
atomic_wait_engine::set_one_time_use_wait_callback(mask1 != SPU_EVENT_LR ? nullptr : +[](u64) -> bool
{