From: Gleb Natapov <gleb@redhat.com>
To: "Binh Q. Pham" <binhpham@cs.rutgers.edu>
Cc: kvm@vger.kernel.org
Subject: Re: Performance counters in kvm?
Date: Wed, 13 Nov 2013 19:54:09 +0200 [thread overview]
Message-ID: <20131113175409.GA2088@redhat.com> (raw)
In-Reply-To: <5283AE31.1000303@cs.rutgers.edu>
On Wed, Nov 13, 2013 at 11:52:01AM -0500, Binh Q. Pham wrote:
> Hi all,
>
> I just started using kvm and want to use linux 'perf' tool inside
> the virtual machine to get some information about the hardware
> performance counters. I noticed in kvm source, there is pmu.c and
> pmu-stubs.c, so I assume they provide support for PMU. However, when
> I ran 'perf stat' in the VM, all hardware events are not supported.
> Sample screen shot:
>
> perf stat /bin/ls
> Performance counter stats for '/bin/ls':
> <not supported> cycles
> <not supported> stalled-cycles-frontend
> ....
>
> Could someone clarify for me if I can use 'perf' in VM with the
> current kvm state?
>
You need to specify host cpu type to QEMU: -cpu host.
--
Gleb.
next prev parent reply other threads:[~2013-11-13 17:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-13 16:52 Performance counters in kvm? Binh Q. Pham
2013-11-13 17:54 ` Gleb Natapov [this message]
2013-11-14 3:22 ` Binh Q. Pham
2013-11-14 7:16 ` Gleb Natapov
2013-11-14 16:17 ` Binh Q. Pham
2013-11-14 16:46 ` Gleb Natapov
2013-11-14 17:04 ` Binh Q. Pham
2013-11-14 17:21 ` Gleb Natapov
2013-11-14 20:31 ` Binh Q. Pham
2013-11-14 21:08 ` Gleb Natapov
2013-12-09 18:59 ` Binh Q. Pham
2013-12-10 10:59 ` Gleb Natapov
2013-12-10 14:17 ` Binh Q. Pham
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