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lv2: sys_timer_usleep improvements for linux

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-The minimum quantum on linux appears to be 50 microseconds by default, not 100
-Do not wait for the last quantum to avoid sleeping too long
This commit is contained in:
Malcolm Jestadt 2019-06-18 18:37:44 -04:00 • committed by Ani
parent 9ce7b8a401
commit 31afd046b0
1 changed files with 8 additions and 2 deletions
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10
rpcs3/Emu/Cell/lv2/sys_timer.cpp
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@ -294,7 +294,8 @@ error_code sys_timer_usleep(ppu_thread& ppu, u64 sleep_time)
if (sleep_time) if (sleep_time)
{ {
#ifdef __linux__ #ifdef __linux__
constexpr u32 host_min_quantum = 100; // TODO: Confirm whether Apple or any BSD can benefit from this as well
constexpr u32 host_min_quantum = 50;
#else #else
// Host scheduler quantum for windows (worst case) // Host scheduler quantum for windows (worst case)
// NOTE: On ps3 this function has very high accuracy // NOTE: On ps3 this function has very high accuracy
@ -317,8 +318,13 @@ error_code sys_timer_usleep(ppu_thread& ppu, u64 sleep_time)
if (remaining > host_min_quantum) if (remaining > host_min_quantum)
{ {
// Wait on multiple of min quantum for large durations #ifdef __linux__
// Do not wait for the last quantum to avoid loss of accuracy
thread_ctrl::wait_for(remaining - ((remaining % host_min_quantum) + host_min_quantum));
#else
// Wait on multiple of min quantum for large durations to avoid overloading low thread cpus
thread_ctrl::wait_for(remaining - (remaining % host_min_quantum)); thread_ctrl::wait_for(remaining - (remaining % host_min_quantum));
#endif
} }
else else
{ {