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KVM: x86: Eliminate log spam from limited APIC timer periods

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SAP's vSMP MemoryONE continuously requests a local APIC timer period
less than 500 us, resulting in the following kernel log spam:

  kvm: vcpu 15: requested 70240 ns lapic timer period limited to 500000 ns
  kvm: vcpu 19: requested 52848 ns lapic timer period limited to 500000 ns
  kvm: vcpu 15: requested 70256 ns lapic timer period limited to 500000 ns
  kvm: vcpu 9: requested 70256 ns lapic timer period limited to 500000 ns
  kvm: vcpu 9: requested 70208 ns lapic timer period limited to 500000 ns
  kvm: vcpu 9: requested 387520 ns lapic timer period limited to 500000 ns
  kvm: vcpu 9: requested 70160 ns lapic timer period limited to 500000 ns
  kvm: vcpu 66: requested 205744 ns lapic timer period limited to 500000 ns
  kvm: vcpu 9: requested 70224 ns lapic timer period limited to 500000 ns
  kvm: vcpu 9: requested 70256 ns lapic timer period limited to 500000 ns
  limit_periodic_timer_frequency: 7569 callbacks suppressed
  ...

To eliminate this spam, change the pr_info_ratelimited() in
limit_periodic_timer_frequency() to pr_info_once().

Reported-by: James Houghton <jthoughton@google.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Message-ID: <20240724190640.2449291-1-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jim Mattson
2024-07-24 12:05:09 -07:00
committed by Paolo Bonzini
parent 332d2c1d71
commit 0005ca2076
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kvm/lapic.c
View File

@@ -1743,7 +1743,7 @@ static void limit_periodic_timer_frequency(struct kvm_lapic *apic)
s64 min_period = min_timer_period_us * 1000LL;
if (apic->lapic_timer.period < min_period) {
pr_info_ratelimited(
pr_info_once(
"vcpu %i: requested %lld ns "
"lapic timer period limited to %lld ns\n",
apic->vcpu->vcpu_id,