From: Paolo Bonzini <pbonzini@redhat.com>
To: Andi Kleen <andi@firstfloor.org>, Eric Northup <digitaleric@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
gleb@kernel.org, Stephane Eranian <eranian@google.com>,
KVM <kvm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 4/4] kvm: Implement PEBS virtualization
Date: Thu, 19 Jun 2014 16:39:57 +0200 [thread overview]
Message-ID: <53A2F63D.6010704@redhat.com> (raw)
In-Reply-To: <20140602195711.GQ25366@two.firstfloor.org>
Il 02/06/2014 21:57, Andi Kleen ha scritto:
> > It would be a bigger concern if we expected virtual PMU migration to
> > work, but I think it would be nice to update kvm_pmu_cpuid_update() to
> > notice the presence/absence of the new CPUID bits, and then store that
> > into per-VM kvm_pmu->pebs_allowed rather than relying only on the
> > per-host perf_pebs_virtualization().
>
> I hope at some point it can work. There shouldn't be any problems
> with migrating to the same CPU model, in many cases (same event
> and same PEBS format) it'll likely even work between models or
> gracefully degrade.
The code is there in both kernel and QEMU, it's just very little tested.
Paolo
next prev parent reply other threads:[~2014-06-19 14:40 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-30 1:12 Implement PEBS virtualization for Silvermont Andi Kleen
2014-05-30 1:12 ` [PATCH 1/4] perf: Add PEBS virtualization enable " Andi Kleen
2014-05-30 1:12 ` [PATCH 2/4] perf: Allow guest PEBS for KVM owned counters Andi Kleen
2014-05-30 7:31 ` Peter Zijlstra
2014-05-30 16:03 ` Andi Kleen
2014-05-30 16:17 ` Peter Zijlstra
2014-05-30 1:12 ` [PATCH 3/4] perf: Handle guest PEBS events with a fake event Andi Kleen
2014-05-30 7:34 ` Peter Zijlstra
2014-05-30 16:29 ` Andi Kleen
2014-05-30 1:12 ` [PATCH 4/4] kvm: Implement PEBS virtualization Andi Kleen
2014-05-30 8:21 ` Gleb Natapov
2014-05-30 16:24 ` Andi Kleen
2014-06-02 16:45 ` Gleb Natapov
2014-06-02 16:52 ` Andi Kleen
2014-06-02 19:09 ` Marcelo Tosatti
2014-06-02 19:05 ` Eric Northup
2014-06-02 19:57 ` Andi Kleen
2014-06-19 14:39 ` Paolo Bonzini [this message]
2014-06-10 18:04 ` Marcelo Tosatti
2014-06-10 19:22 ` Andi Kleen
2014-06-10 21:06 ` Marcelo Tosatti
2014-06-19 14:42 ` Paolo Bonzini
2014-06-19 17:33 ` Andi Kleen
2014-06-19 20:33 ` Paolo Bonzini
2014-06-22 13:57 ` Avi Kivity
2014-06-22 19:02 ` Andi Kleen
2014-06-24 16:45 ` Marcelo Tosatti
2014-06-25 7:04 ` Avi Kivity
2014-05-30 7:39 ` Implement PEBS virtualization for Silvermont Peter Zijlstra
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