Re: OProfile patch for Linux 3.2

[Konrad Rzeszutek Wilk <konrad@darnok.org>]

On Tue, Jan 31, 2012 at 07:28:12PM -0600, W. Michael Petullo wrote:
> >> I have ported Anil's passive profile-capable OProfile patch to Linux
> >> 3.2. I have be able to hobble this patch along to new kernel versions, but
> >> it is in need of additional work if it is to be submitted upstream. Please
> >> see:
> >> 
> >> http://www.flyn.org/patches/linux-xen-passive-oprofile/linux-3.2-xen-passive-oprofile.patch.gz
> >> 
> >> With this patch applied to Linux 3.2, I can perform passive
> >> profiling of an unprivileged Xen domain.
> 
> > What version of oprofile did you use?
> 
> Fedora's oprofile-0.9.6-21.fc16.x86_64.

So I took a spin at this - it applies nicely and cleanly to 3.2, and
was wondering how you profile passive domains?

I do something like this:

opcontrol --vmlinux=/mnt/lab/vmlinux-dom0 --xen=/mnt/lab/xen-syms --passive-domains=3,2 --callgraph=10 --passive-images=/mnt/lab/10gb/tiny-vmlinux  -p=cpu 
opcontrol --start-daemon

opcontrol --start
/mnt/lab/10gb/create_csv.sh 1
opcontrol --stop

The little create_csv.sh makes the two domains talk to each other
(netperf) and I want to get a feel for what it is happening.

But what I get is exclusivly to domain0 and to xen. Nothing about
the guests?

Are you doing something speciail to profile the passive domains?

Thanks.