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perf: limit high-resolution sleep busy-waiting

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nmzik
2026-08-07 17:44:55 +02:00
parent 7907a50817
commit 216c580d13
3 changed files with 16 additions and 24 deletions
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src/common/threads.cpp
+6 -2
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@@ -28,7 +28,8 @@
#ifdef KYTY_WIN_CS
#include <windows.h> // IWYU pragma: keep
// IWYU pragma: no_include <winbase.h>
constexpr DWORD KYTY_CS_SPIN_COUNT = 4000;
constexpr DWORD KYTY_CS_SPIN_COUNT = 4000;
constexpr uint64_t KYTY_SLEEP_SPIN_LIMIT_100NS = 500; // 50 us
#ifndef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
#define CREATE_WAITABLE_TIMER_HIGH_RESOLUTION 0x00000002
@@ -39,7 +40,10 @@ static void SleepHighResolution100ns(uint64_t units_100ns) {
return;
}
if (units_100ns <= 10000) {
// Keep spinning only where a kernel transition is
// likely to cost more than the requested delay; ordinary millisecond sleeps use the
// per-thread high-resolution waitable timer below.
if (units_100ns <= KYTY_SLEEP_SPIN_LIMIT_100NS) {
LARGE_INTEGER frequency {};
LARGE_INTEGER start {};
if (QueryPerformanceFrequency(&frequency) != 0 && QueryPerformanceCounter(&start) != 0 &&