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timer_resolution: Set current process to High QoS

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Ensures that this process is treated as a high performance process by the Windows scheduler.
This commit is contained in:
Morph 2023-03-03 20:54:15 -05:00
parent 3453beb1e0
commit 026eaddbee
1 changed files with 22 additions and 0 deletions
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22
src/common/windows/timer_resolution.cpp
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@ -18,6 +18,15 @@ NTSYSAPI LONG NTAPI NtSetTimerResolution(ULONG DesiredResolution, BOOLEAN SetRes
NTSYSAPI LONG NTAPI NtDelayExecution(BOOLEAN Alertable, PLARGE_INTEGER DelayInterval);
}
// Defines for compatibility with older Windows 10 SDKs.
#ifndef PROCESS_POWER_THROTTLING_EXECUTION_SPEED
#define PROCESS_POWER_THROTTLING_EXECUTION_SPEED 0x1
#endif
#ifndef PROCESS_POWER_THROTTLING_IGNORE_TIMER_RESOLUTION
#define PROCESS_POWER_THROTTLING_IGNORE_TIMER_RESOLUTION 0x4
#endif
namespace Common::Windows {
namespace {
@ -51,6 +60,18 @@ TimerResolution GetTimerResolution() {
};
}
void SetHighQoS() {
// https://learn.microsoft.com/en-us/windows/win32/procthread/quality-of-service
PROCESS_POWER_THROTTLING_STATE PowerThrottling{
.Version{PROCESS_POWER_THROTTLING_CURRENT_VERSION},
.ControlMask{PROCESS_POWER_THROTTLING_EXECUTION_SPEED |
PROCESS_POWER_THROTTLING_IGNORE_TIMER_RESOLUTION},
.StateMask{},
};
SetProcessInformation(GetCurrentProcess(), ProcessPowerThrottling, &PowerThrottling,
sizeof(PROCESS_POWER_THROTTLING_STATE));
}
} // Anonymous namespace
nanoseconds GetMinimumTimerResolution() {
@ -74,6 +95,7 @@ nanoseconds SetCurrentTimerResolution(nanoseconds timer_resolution) {
}
nanoseconds SetCurrentTimerResolutionToMaximum() {
SetHighQoS();
return SetCurrentTimerResolution(GetMaximumTimerResolution());
}