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Re: [RFC PATCH 0/7] Add support for monitoring guest TLB operations

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On 17/08/2016 19:01, Punit Agrawal wrote:
>> Can you explain what this is used for?  In other words, why would this
>> be used instead of just running perf in the guest?
> 
> As TLB maintenance operations are synchronised in hardware, they can
> impact performance beyond the guest. The operations generate traffic on
> the interconnect and depending on the implementation, they can also
> affect the remote TLB's translation bandwidth.
> 
> These patches are useful on systems where the host and guest are
> controlled by different users - the guest could be running arbitrary
> software. 
> 
> Having the ability to monitor the usage of guest TLB invalidations in
> the host can be useful to diagnose performance issues on such systems.

Are there hardware performance counters for these operations?

Paolo

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[RFC PATCH 0/7] Add support for monitoring guest TLB operations Punit Agrawal <punit.agrawal@arm.com> - 2016-08-16 12:50 +0200
  [RFC PATCH 2/7] KVM: Track the pid of the VM process Punit Agrawal <punit.agrawal@arm.com> - 2016-08-16 12:50 +0200
  [RFC PATCH 1/7] perf/trace: Add notification for perf trace events Punit Agrawal <punit.agrawal@arm.com> - 2016-08-16 12:50 +0200
  [RFC PATCH 6/7] arm64: KVM: Handle trappable TLB instructions Punit Agrawal <punit.agrawal@arm.com> - 2016-08-16 12:50 +0200
    Re: [RFC PATCH 6/7] arm64: KVM: Handle trappable TLB instructions Will Deacon <will.deacon@arm.com> - 2016-08-19 17:20 +0200
      Re: [RFC PATCH 6/7] arm64: KVM: Handle trappable TLB instructions Punit Agrawal <punit.agrawal@arm.com> - 2016-08-24 12:50 +0200
  [RFC PATCH 3/7] KVM: arm/arm64: Register perf trace event notifier Punit Agrawal <punit.agrawal@arm.com> - 2016-08-16 12:50 +0200
  Re: [RFC PATCH 0/7] Add support for monitoring guest TLB operations Paolo Bonzini <pbonzini@redhat.com> - 2016-08-17 18:00 +0200
    Re: [RFC PATCH 0/7] Add support for monitoring guest TLB operations Punit Agrawal <punit.agrawal@arm.com> - 2016-08-17 19:10 +0200
      Re: [RFC PATCH 0/7] Add support for monitoring guest TLB operations Paolo Bonzini <pbonzini@redhat.com> - 2016-08-17 19:10 +0200
        Re: [RFC PATCH 0/7] Add support for monitoring guest TLB operations Punit Agrawal <punit.agrawal@arm.com> - 2016-08-17 19:30 +0200
          Re: [RFC PATCH 0/7] Add support for monitoring guest TLB operations Paolo Bonzini <pbonzini@redhat.com> - 2016-08-18 09:10 +0200

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