Re: Virtualization of the CPU Performance Monitoring Unit

[Lin Ming <mlin@ss.pku.edu.cn>]

On Tue, 2012-04-10 at 10:52 +0100, Ian Campbell wrote:
> On Sun, 2012-04-08 at 07:58 +0100, Lin Ming wrote:
> > On Sat, Apr 7, 2012 at 2:36 AM, Konrad Rzeszutek Wilk
> > <konrad.wilk@oracle.com> wrote:
> > > On Fri, Apr 06, 2012 at 11:43:00AM -0500, Wei Huang wrote:
> > >> On 04/06/2012 10:41 AM, Lin Ming wrote:
> > >> >Hi list,
> > >> >
> > >> >Is anybody working on virtualization of the CPU Performance Monitoring Unit?
> > >> >
> > >> >There are 2 PMU related projects listed on GSoC 2012 page.
> > >> >http://wiki.xen.org/wiki/Archived/GSoC_2012_Ideas
> > >> >
> > >> >- Virtualization of the CPU Performance Monitoring Unit
> > >> >- Perf support for Xen
> > >> >
> > >> >I'm interested on these 2 projects.
> > >> Hi Lin,
> > >>
> > >> 1. I don't think Xen was accepted as an organization for 2012 GSOC.
> > >> See
> > >> http://lists.xen.org/archives/html/xen-devel/2012-03/msg02080.html.
> > >> 2. The PMU project description in the wiki is vague. I know HVM
> > >> guests support virtualized PMU. Please check vpmu.c files in /hvm,
> > >> /svm, and /vmx directories. You better ask mentors for details
> > >> (maybe this is XCP specific?).
> > >
> > > This is dom0 related. So being able to use perf to instrument
> > > the hypervisor (and the guests from dom0).
> > 
> > For guests instrument:
> > 
> > How about use perf on guests(domU) directly?
> 
> I guess that would be a subset of the dom0 support? e.g. the ability for
> a PV guest to run perf on itself.

Yes.

> 
> Ian.
> 
>