KVM: LAPIC: Loosen filter for adaptive tuning of lapic_timer_advance_ns (a0f0037e) · Commits · 戴 / test

arch/x86/kvm/lapic.c

+7 −6

Original line number	Diff line number	Diff line
		@@ -66,9 +66,10 @@
		#define X2APIC_BROADCAST 0xFFFFFFFFul

		static bool lapic_timer_advance_dynamic __read_mostly;
		#define LAPIC_TIMER_ADVANCE_ADJUST_MIN 100
		#define LAPIC_TIMER_ADVANCE_ADJUST_MAX 5000
		#define LAPIC_TIMER_ADVANCE_ADJUST_INIT 1000
		#define LAPIC_TIMER_ADVANCE_ADJUST_MIN 100 /* clock cycles */
		#define LAPIC_TIMER_ADVANCE_ADJUST_MAX 10000 /* clock cycles */
		#define LAPIC_TIMER_ADVANCE_NS_INIT 1000
		#define LAPIC_TIMER_ADVANCE_NS_MAX 5000
		/* step-by-step approximation to mitigate fluctuation */
		#define LAPIC_TIMER_ADVANCE_ADJUST_STEP 8

		@@ -1504,8 +1505,8 @@ static inline void adjust_lapic_timer_advance(struct kvm_vcpu *vcpu,
		timer_advance_ns += ns/LAPIC_TIMER_ADVANCE_ADJUST_STEP;
		}

		if (unlikely(timer_advance_ns > LAPIC_TIMER_ADVANCE_ADJUST_MAX))
		timer_advance_ns = LAPIC_TIMER_ADVANCE_ADJUST_INIT;
		if (unlikely(timer_advance_ns > LAPIC_TIMER_ADVANCE_NS_MAX))
		timer_advance_ns = LAPIC_TIMER_ADVANCE_NS_INIT;
		apic->lapic_timer.timer_advance_ns = timer_advance_ns;
		}

		@@ -2302,7 +2303,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu, int timer_advance_ns)
		HRTIMER_MODE_ABS_HARD);
		apic->lapic_timer.timer.function = apic_timer_fn;
		if (timer_advance_ns == -1) {
		apic->lapic_timer.timer_advance_ns = LAPIC_TIMER_ADVANCE_ADJUST_INIT;
		apic->lapic_timer.timer_advance_ns = LAPIC_TIMER_ADVANCE_NS_INIT;
		lapic_timer_advance_dynamic = true;
		} else {
		apic->lapic_timer.timer_advance_ns = timer_advance_ns;