From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Ostrovsky Subject: Re: Perf support Date: Sat, 16 Mar 2013 20:48:06 -0700 (PDT) Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============6604306326990981143==" Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: john.l.nelson@gmail.com Cc: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org --===============6604306326990981143== Content-Type: multipart/alternative; boundary="__13634920867752053abhmt105.oracle.com" --__13634920867752053abhmt105.oracle.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline ----- john.l.nelson@gmail.com wrote:=20 >=20 >I am a member of the PAPI team ( http://icl.cs.utk.edu/papi/ ). We are int= erested in supporting performance counters in xen. It would appear from a f= ew threads in 2012 that xen should support counter access using perf (which= is what our tool uses). However, I have not been able to successfully get = any results in Dom0 or DomU. I am getting the error in dmesg:=20 >=20 > Performance Events: unsupported p6 CPU model 42 no PMU driver,=20 > software events only.=20 >=20 > Does this necessarily mean that this CPU will not support PMU at all? Are= there any other specific steps I need to take other than including vpmu fl= ag to enable virtual PMU support?=20 HVM guests should support perf with HW counters but this won't work on PV g= uests (including dom0) at this time.=20 -boris=20 --__13634920867752053abhmt105.oracle.com Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline <= div style=3D'font-family: Times New Roman; font-size: 12pt; color: #000000'= >
----- john.l.nelson@gmail.com wrote:
>

>I am a member of the PAPI team (http://icl.cs.utk.edu/papi/). We are interested in supporting performance counters in xen. It would a= ppear from a few threads in 2012 that xen should support counter access usi= ng perf (which is what our tool uses). However, I have not been able to suc= cessfully get any results in Dom0 or DomU. I am getting the error in dmesg:=

>=20
> Performance Events: unsupported p6 C= PU model 42 no PMU driver,
> software events only.
>
> Does this necessarily mean that this CPU wil= l not support PMU at all? Are there any other specific steps I need to take= other than including vpmu flag to enable virtual PMU support?

H= VM guests should support perf with HW counters but this won't work on PV gu= ests (including dom0) at this time.

-boris

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