Re: [Xen-devel] Virtualization of the CPU Performance Monitoring Unit

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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@xxxxxxxxxx> 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.

Ian.



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