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LV2: Improve sys_timer_usleep by using CPU usermode waiting

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* Linux: set timerslack to minimum value
- Linux delays the wakeup of threads to save power, this feature isn't needed for this application

* Utils: Add detection for waitpkg and monitorx extensions
- These instructions are used for user mode wait instructions

* lv2: Use user mode wait instructions instead of yielding when appropriate
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Whatcookie 2023-08-05 04:49:30 -04:00 • committed by GitHub
parent aee97e414f
commit d4cf12bc17
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4 changed files with 101 additions and 1 deletions
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35
rpcs3/util/sysinfo.cpp
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@ -298,7 +298,7 @@ bool utils::has_fma4()
bool utils::has_fast_vperm2b()
{
#if defined(ARCH_X64)
static const bool g_value = has_avx512() && (get_cpuid(7, 0)[2] & 0x2) == 0x2 && get_cpuid(0, 0)[0] >= 0x7 && (get_cpuid(0x80000001, 0)[2] & 0x20) == 0x20;
static const bool g_value = has_avx512() && (get_cpuid(7, 0)[2] & 0x2) == 0x2 && get_cpuid(0, 0)[0] >= 0x7 && (get_cpuid(0x80000001, 0)[2] & 0x40) == 0x40;
return g_value;
#else
return false;
@ -325,6 +325,39 @@ bool utils::has_fsrm()
#endif
}
bool utils::has_waitx()
{
#if defined(ARCH_X64)
static const bool g_value = get_cpuid(0, 0)[0] >= 0x7 && (get_cpuid(0x80000001, 0)[2] & 0x20000000) == 0x20000000;
return g_value;
#else
return false;
#endif
}
bool utils::has_waitpkg()
{
#if defined(ARCH_X64)
static const bool g_value = get_cpuid(0, 0)[0] >= 0x7 && (get_cpuid(7, 0)[2] & 0x20) == 0x20;
return g_value;
#else
return false;
#endif
}
// User mode waits may be unfriendly to low thread CPUs
// Filter out systems with less than 8 threads for linux and less than 12 threads for other platforms
bool utils::has_appropriate_um_wait()
{
#ifdef __linux__
static const bool g_value = (has_waitx() || has_waitpkg()) && (get_thread_count() >= 8) && get_tsc_freq();
return g_value;
#else
static const bool g_value = (has_waitx() || has_waitpkg()) && (get_thread_count() >= 12) && get_tsc_freq();
return g_value;
#endif
}
u32 utils::get_rep_movsb_threshold()
{
static const u32 g_value = []()