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Kernel: Only use the TSC when it is invariant

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Markus Pfeifenberger 2022-10-06 16:35:13 +02:00 • committed by Andrew Kaster
parent cf48200e7b
commit 0cfcac7900
1 changed files with 1 additions and 2 deletions
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3
Kernel/Scheduler.cpp
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@ -381,8 +381,7 @@ UNMAP_AFTER_INIT void Scheduler::initialize()
VERIFY(Processor::is_initialized()); // sanity check VERIFY(Processor::is_initialized()); // sanity check
// Figure out a good scheduling time source // Figure out a good scheduling time source
if (Processor::current().has_feature(CPUFeature::TSC)) { if (Processor::current().has_feature(CPUFeature::TSC) && Processor::current().has_feature(CPUFeature::CONSTANT_TSC)) {
// TODO: only use if TSC is running at a constant frequency?
current_time = current_time_tsc; current_time = current_time_tsc;
} else { } else {
// TODO: Using HPET is rather slow, can we use any other time source that may be faster? // TODO: Using HPET is rather slow, can we use any other time source that may be faster?