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Re: [Xen-devel] Questions about OProfile

To: "W. Michael Petullo" <mike@xxxxxxxx>
Subject: Re: [Xen-devel] Questions about OProfile
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Mon, 11 Apr 2011 10:22:16 -0400
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Anil Madhavapeddy <anil@xxxxxxxxxx>
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On Wed, Apr 06, 2011 at 11:31:31AM -0500, W. Michael Petullo wrote:
> >>>> 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
> Thanks, Anil. I was able to get your patch to work. If anyone is
> interested in what I did, please see:
>       https://bugzilla.redhat.com/show_bug.cgi?id=693596#c2
> An a related note, would there be any interest in cleaning up this patch
> and moving it to 2.6.38 as a part of Google Summer of Code?

There would be interest in getting it cleaned up for 2.6.38.

I don't think it could be done under GSOC - it looks like it would
just take a week for it to be done.

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