Re: [RFC] Unify KVM kernel-space and user-space code into a single project

Joerg Roedel
2010-03-24T16:23:43Z

On Wed, Mar 24, 2010 at 05:03:42PM +0100, Peter Zijlstra wrote:
> On Wed, 2010-03-24 at 16:01 +0100, Joerg Roedel wrote:
>
> > What I meant was: perf-kernel puts the guest-name into every sample and
> > perf-userspace accesses /sys/kvm/guest_name/fs/ later to resolve the
> > symbols. I leave the question of how the guest-fs is exposed to the host
> > out of this discussion. We should discuss this seperatly.
>
> I'd much prefer a pid like suggested later, keeps the samples smaller.
>
> But that said, we need guest kernel events like mmap and context
> switches too, otherwise we simply can't make sense of guest userspace
> addresses, we need to know the guest address space layout.

With the filesystem approach all we need is the pid of the guest
process. Then we can access proc/<pid>/maps of the guest and read out the
address space layout, no?

Joerg