From: Paolo Bonzini <pbonzini@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>,
Jing Zhang <jingzhangos@google.com>, KVM <kvm@vger.kernel.org>,
KVMARM <kvmarm@lists.cs.columbia.edu>,
LinuxMIPS <linux-mips@vger.kernel.org>,
KVMPPC <kvm-ppc@vger.kernel.org>,
LinuxS390 <linux-s390@vger.kernel.org>,
Linuxkselftest <linux-kselftest@vger.kernel.org>,
Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Will Deacon <will@kernel.org>,
Huacai Chen <chenhuacai@kernel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Paul Mackerras <paulus@ozlabs.org>,
Janosch Frank <frankja@linux.ibm.com>,
David Hildenbrand <david@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Jim Mattson <jmattson@google.com>,
Peter Shier <pshier@google.com>, Oliver Upton <oupton@google.com>,
David Rientjes <rientjes@google.com>,
Emanuele Giuseppe Esposito <eesposit@redhat.com>,
David Matlack <dmatlack@google.com>,
Ricardo Koller <ricarkol@google.com>,
Krish Sadhukhan <krish.sadhukhan@oracle.com>
Subject: Re: [PATCH v7 1/4] KVM: stats: Separate generic stats from architecture specific ones
Date: Fri, 11 Jun 2021 14:14:09 +0200 [thread overview]
Message-ID: <8dd7259c-d0f6-6816-178f-ab0f0b486955@redhat.com> (raw)
In-Reply-To: <050e9d8e-278d-278c-13f7-ea0b39d13fbe@de.ibm.com>
On 11/06/21 14:08, Christian Borntraeger wrote:
>>
>> I always interpreted it as "number of times the KVM page table
>> management code needed other CPUs to learn about new page tables".
>> Whether the broadcast is done in software or hardware shouldn't
>> matter; either way I suppose there is still some traffic on the bus
>> involved.
>
>
> My point is that KVM page table management on s390x completely
> piggy-backs on the qemu address space page table management from common
> code for the last level.
> And due to the way we handle page tables we also do not teach "other
> CPUs". We always teach the whole system with things like IPTE.
But that just means that you'll have fewer KVM-exclusive and thus nicer
numbers than x86 or ARM. :) It still makes sense to count
gmap_flush_tlb calls.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>,
Jing Zhang <jingzhangos@google.com>, KVM <kvm@vger.kernel.org>,
KVMARM <kvmarm@lists.cs.columbia.edu>,
LinuxMIPS <linux-mips@vger.kernel.org>,
KVMPPC <kvm-ppc@vger.kernel.org>,
LinuxS390 <linux-s390@vger.kernel.org>,
Linuxkselftest <linux-kselftest@vger.kernel.org>,
Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Will Deacon <will@kernel.org>,
Huacai Chen <chenhuacai@kernel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Paul Mackerras <paulus@ozlabs.org>,
Janosch Frank <frankja@linux.ibm.com>,
David Hildenbrand <david@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Jim Mattson <jmattson@google.com>,
Peter Shier <pshier@google.com>, Oliver Upton <oupton@google.com>,
David Rientjes <rientjes@google.com>,
Emanuele Giuseppe Esposito <eesposit@redhat.com>,
David Matlack <dmatlack@google.com>,
Ricardo Koller <ricarkol@google.com>,
Krish Sadhukhan <krish.sadhukhan@oracle.com>
Subject: Re: [PATCH v7 1/4] KVM: stats: Separate generic stats from architecture specific ones
Date: Fri, 11 Jun 2021 14:14:09 +0200 [thread overview]
Message-ID: <8dd7259c-d0f6-6816-178f-ab0f0b486955@redhat.com> (raw)
In-Reply-To: <050e9d8e-278d-278c-13f7-ea0b39d13fbe@de.ibm.com>
On 11/06/21 14:08, Christian Borntraeger wrote:
>>
>> I always interpreted it as "number of times the KVM page table
>> management code needed other CPUs to learn about new page tables".
>> Whether the broadcast is done in software or hardware shouldn't
>> matter; either way I suppose there is still some traffic on the bus
>> involved.
>
>
> My point is that KVM page table management on s390x completely
> piggy-backs on the qemu address space page table management from common
> code for the last level.
> And due to the way we handle page tables we also do not teach "other
> CPUs". We always teach the whole system with things like IPTE.
But that just means that you'll have fewer KVM-exclusive and thus nicer
numbers than x86 or ARM. :) It still makes sense to count
gmap_flush_tlb calls.
Paolo
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>,
Jing Zhang <jingzhangos@google.com>, KVM <kvm@vger.kernel.org>,
KVMARM <kvmarm@lists.cs.columbia.edu>,
LinuxMIPS <linux-mips@vger.kernel.org>,
KVMPPC <kvm-ppc@vger.kernel.org>,
LinuxS390 <linux-s390@vger.kernel.org>,
Linuxkselftest <linux-kselftest@vger.kernel.org>,
Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Will Deacon <will@kernel.org>,
Huacai Chen <chenhuacai@kernel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Paul Mackerras <paulus@ozlabs.org>,
Janosch Frank <frankja@linux.ibm.com>,
David Hildenbrand <david@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Jim Mattson <jmattson@google.com>,
Peter Shier <pshier@google.com>, Oliver Upton <oupton@google.com>,
David Rientjes <rientjes@google.com>,
Emanuele Giuseppe Esposito <eesposit@redhat.com>,
David Matlack <dmatlack@google.com>,
Ricardo Koller <ricarkol@google.com>,
Krish Sadhukhan <krish.sadhukhan@oracle.com>
Subject: Re: [PATCH v7 1/4] KVM: stats: Separate generic stats from architecture specific ones
Date: Fri, 11 Jun 2021 12:14:09 +0000 [thread overview]
Message-ID: <8dd7259c-d0f6-6816-178f-ab0f0b486955@redhat.com> (raw)
In-Reply-To: <050e9d8e-278d-278c-13f7-ea0b39d13fbe@de.ibm.com>
On 11/06/21 14:08, Christian Borntraeger wrote:
>>
>> I always interpreted it as "number of times the KVM page table
>> management code needed other CPUs to learn about new page tables".
>> Whether the broadcast is done in software or hardware shouldn't
>> matter; either way I suppose there is still some traffic on the bus
>> involved.
>
>
> My point is that KVM page table management on s390x completely
> piggy-backs on the qemu address space page table management from common
> code for the last level.
> And due to the way we handle page tables we also do not teach "other
> CPUs". We always teach the whole system with things like IPTE.
But that just means that you'll have fewer KVM-exclusive and thus nicer
numbers than x86 or ARM. :) It still makes sense to count
gmap_flush_tlb calls.
Paolo
next prev parent reply other threads:[~2021-06-11 12:14 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-03 21:14 [PATCH v7 0/4] KVM statistics data fd-based binary interface Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-03 21:14 ` [PATCH v7 1/4] KVM: stats: Separate generic stats from architecture specific ones Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-07 19:22 ` Krish Sadhukhan
2021-06-07 19:22 ` Krish Sadhukhan
2021-06-07 19:22 ` Krish Sadhukhan
2021-06-11 6:57 ` Christian Borntraeger
2021-06-11 6:57 ` Christian Borntraeger
2021-06-11 6:57 ` Christian Borntraeger
2021-06-11 10:51 ` Paolo Bonzini
2021-06-11 10:51 ` Paolo Bonzini
2021-06-11 10:51 ` Paolo Bonzini
2021-06-11 12:00 ` Christian Borntraeger
2021-06-11 12:00 ` Christian Borntraeger
2021-06-11 12:00 ` Christian Borntraeger
2021-06-11 12:03 ` Paolo Bonzini
2021-06-11 12:03 ` Paolo Bonzini
2021-06-11 12:03 ` Paolo Bonzini
2021-06-11 12:08 ` Christian Borntraeger
2021-06-11 12:08 ` Christian Borntraeger
2021-06-11 12:08 ` Christian Borntraeger
2021-06-11 12:14 ` Paolo Bonzini [this message]
2021-06-11 12:14 ` Paolo Bonzini
2021-06-11 12:14 ` Paolo Bonzini
2021-06-03 21:14 ` [PATCH v7 2/4] KVM: stats: Add fd-based API to read binary stats data Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-07 19:22 ` Krish Sadhukhan
2021-06-07 19:22 ` Krish Sadhukhan
2021-06-07 19:22 ` Krish Sadhukhan
2021-06-07 22:10 ` Jing Zhang
2021-06-07 22:10 ` Jing Zhang
2021-06-07 22:10 ` Jing Zhang
2021-06-10 16:23 ` Paolo Bonzini
2021-06-10 16:23 ` Paolo Bonzini
2021-06-10 16:23 ` Paolo Bonzini
2021-06-10 17:26 ` Jing Zhang
2021-06-10 17:26 ` Jing Zhang
2021-06-10 17:26 ` Jing Zhang
2021-06-10 22:47 ` Jing Zhang
2021-06-10 22:47 ` Jing Zhang
2021-06-10 22:47 ` Jing Zhang
2021-06-11 10:32 ` Paolo Bonzini
2021-06-11 10:32 ` Paolo Bonzini
2021-06-11 10:32 ` Paolo Bonzini
2021-06-10 16:42 ` Paolo Bonzini
2021-06-10 16:42 ` Paolo Bonzini
2021-06-10 16:42 ` Paolo Bonzini
2021-06-10 17:27 ` Jing Zhang
2021-06-10 17:27 ` Jing Zhang
2021-06-10 17:27 ` Jing Zhang
2021-06-13 15:19 ` Fuad Tabba
2021-06-13 15:19 ` Fuad Tabba
2021-06-13 15:19 ` Fuad Tabba
2021-06-13 16:42 ` Jing Zhang
2021-06-13 16:42 ` Jing Zhang
2021-06-13 16:42 ` Jing Zhang
2021-06-03 21:14 ` [PATCH v7 3/4] KVM: stats: Add documentation for statistics data binary interface Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-07 19:22 ` Krish Sadhukhan
2021-06-07 19:22 ` Krish Sadhukhan
2021-06-07 19:22 ` Krish Sadhukhan
2021-06-07 22:09 ` Jing Zhang
2021-06-07 22:09 ` Jing Zhang
2021-06-07 22:09 ` Jing Zhang
2021-06-14 7:56 ` Fuad Tabba
2021-06-14 7:56 ` Fuad Tabba
2021-06-14 7:56 ` Fuad Tabba
2021-06-14 13:19 ` Jing Zhang
2021-06-14 13:19 ` Jing Zhang
2021-06-14 13:19 ` Jing Zhang
2021-06-03 21:14 ` [PATCH v7 4/4] KVM: selftests: Add selftest for KVM " Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-03 21:14 ` Jing Zhang
2021-06-07 19:23 ` Krish Sadhukhan
2021-06-07 19:23 ` Krish Sadhukhan
2021-06-07 19:23 ` Krish Sadhukhan
2021-06-07 22:12 ` Jing Zhang
2021-06-07 22:12 ` Jing Zhang
2021-06-07 22:12 ` Jing Zhang
2021-06-10 16:46 ` [PATCH v7 0/4] KVM statistics data fd-based " Paolo Bonzini
2021-06-10 16:46 ` Paolo Bonzini
2021-06-10 16:46 ` Paolo Bonzini
2021-06-10 17:30 ` Jing Zhang
2021-06-10 17:30 ` Jing Zhang
2021-06-10 17:30 ` Jing Zhang
2021-06-11 6:57 ` Christian Borntraeger
2021-06-11 6:57 ` Christian Borntraeger
2021-06-11 6:57 ` Christian Borntraeger
2021-06-11 11:02 ` Paolo Bonzini
2021-06-11 11:02 ` Paolo Bonzini
2021-06-11 11:02 ` Paolo Bonzini
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