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

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arch/x86/kvm/lapic.c

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