This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] Questions about OProfile

To: Anil Madhavapeddy <anil@xxxxxxxxxx>
Subject: Re: [Xen-devel] Questions about OProfile
From: "W. Michael Petullo" <mike@xxxxxxxx>
Date: Tue, 5 Apr 2011 16:45:39 -0500
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Tue, 05 Apr 2011 14:47:04 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <CEE47386-BE4D-4683-8C60-0153124C683F@xxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <20110405170310.GA2801@xxxxxxxxx> <CEE47386-BE4D-4683-8C60-0153124C683F@xxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.21 (2010-09-15)
>> 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.

> It's not suitable for upstreaming, but passive profiling of domains 
> works fine for me using this kernel.  Ian Pratt suggested dropping 
> active profiling in order to simplify the patch: does anyone actually 
> use active profiling?

I am especially interested in passive profiling because I wish to profile
experimental kernels. Developing on top of Xen is a big win for this type
of work precisely because of tools like gdbsx and passive profiling. With
this capability, there is no need to spend time adding debugging or
profiling features into a new kernel.

> Jeremy also pointed out the new perf framework in Linux to me at the
> hackathon, but I haven't had a chance to look at how it works:
> https://perf.wiki.kernel.org/index.php/Main_Page



Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>