From: Avi Kivity <avi@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Joerg Roedel <joro@8bytes.org>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: [PATCH v1 0/5] KVM in-guest performance monitoring
Date: Thu, 12 May 2011 12:53:56 +0300 [thread overview]
Message-ID: <4DCBAE34.2000203@redhat.com> (raw)
In-Reply-To: <4DCBACC7.8080000@siemens.com>
On 05/12/2011 12:47 PM, Jan Kiszka wrote:
> >
> > Anyway, I thought about a paravirt-approach instead of implementing a
> > real PMU... But there are certainly good reasons for both.
>
> Paravirt is taking away the pressure from CPU vendors to do their virt
> extensions properly - and doesn't help with unmodifiable OSes.
Yes. In the case of the PMU things are less clear, since they are very
model specific. In the case of Linux, you have to lie to the guest and
present a model number that it doesn't recognize, otherwise it prefers
the model-specific PMU to the architectural PMU.
I though of adding a kvm cpuid bit that says "prefer the architectural
pmu" to work around this issue.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-05-12 9:54 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-11 15:55 [PATCH v1 0/5] KVM in-guest performance monitoring Avi Kivity
2011-05-11 15:55 ` [PATCH v1 1/5] perf: add context parameter to perf_event overflow handler Avi Kivity
2011-06-03 14:41 ` Peter Zijlstra
2011-06-05 8:07 ` Avi Kivity
2011-05-11 15:55 ` [PATCH v1 2/5] x86, perf: add constraints for architectural PMU v1 Avi Kivity
2011-05-11 15:55 ` [PATCH v1 3/5] perf: export perf_event_refresh() to modules Avi Kivity
2011-05-11 15:55 ` [PATCH v1 4/5] KVM: Expose kvm_lapic_local_deliver() Avi Kivity
2011-05-11 15:55 ` [PATCH v1 5/5] KVM: Expose a version 1 architectural PMU to guests Avi Kivity
2011-05-17 19:41 ` Ingo Molnar
2011-05-18 9:03 ` Avi Kivity
2011-05-18 11:07 ` Ingo Molnar
2011-05-18 11:29 ` Peter Zijlstra
2011-05-18 11:57 ` Ingo Molnar
2011-05-18 11:32 ` Peter Zijlstra
2011-05-18 11:37 ` Avi Kivity
2011-05-18 12:35 ` Peter Zijlstra
2011-05-18 12:49 ` Avi Kivity
2011-06-03 14:41 ` Peter Zijlstra
2011-06-05 8:12 ` Avi Kivity
2011-06-03 14:41 ` Peter Zijlstra
2011-06-05 8:12 ` Avi Kivity
2011-05-12 9:33 ` [PATCH v1 0/5] KVM in-guest performance monitoring Joerg Roedel
2011-05-12 9:47 ` Jan Kiszka
2011-05-12 9:53 ` Avi Kivity [this message]
2011-05-12 13:11 ` Joerg Roedel
2011-05-12 13:23 ` Jan Kiszka
2011-05-12 13:43 ` Joerg Roedel
2011-05-12 13:31 ` Avi Kivity
2011-05-12 14:24 ` Joerg Roedel
2011-05-12 14:37 ` Avi Kivity
2011-05-12 14:45 ` Avi Kivity
2011-05-13 12:34 ` Joerg Roedel
2011-05-12 9:51 ` Avi Kivity
2011-05-12 13:06 ` Joerg Roedel
2011-05-12 13:38 ` Avi Kivity
2011-05-12 14:29 ` Joerg Roedel
2011-05-17 9:52 ` Avi Kivity
2011-06-01 9:45 ` Avi Kivity
2011-06-01 10:26 ` Peter Zijlstra
2011-06-01 11:26 ` Avi Kivity
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