Re: Questions about OProfile

["W. Michael Petullo" <mike@flyn.org>]

>>>> First, what is the status of Xenoprof? The latest patch is against 0.9.5,
>>>> but OProfile 0.9.6 is about 16 months old. Is Xenoprof actively
>>>> maintained?

>>> There is a crufty pv_ops patch that I forward ported to 2.6.32 in this tree:
>>> 
>>> https://github.com/avsm/linux-2.6.32-xen-oprofile

>> So, is it true that I need to 1) use this patch or 2) use a non-PV
>> Ops Dom0? I thought 2.6.32 was already non-PV Ops.
 
> I don't understand the question. The above tree is a pv_ops kernel,
> with additional patches applied so it can be a full Xen dom0 (including
> netback, etc).  I'm only sporadically updating it as I need to, so you
> probably just want the oprofile patch [1] if you want to apply it to
> some other kernel.
> 
> https://github.com/avsm/linux-2.6.32-xen-oprofile/commit/4df4780e638d14249b7aa4005511218a9183c324

I ported Anil's patch to Linux 2.6.38. The result is available at:

	http://www.flyn.org/patches/linux-2.6.38-xen-passive-oprofile/linux-2.6.38-xen-passive-oprofile.patch.gz

With this patch applied to Linux 2.6.38 (along with various orthagonal Xen
patches), I can perform passive profiling on an unprivileged Xen domain.

-- 
Mike

:wq