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[Xen-devel] Questions about OProfile

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Questions about OProfile
From: "W. Michael Petullo" <mike@xxxxxxxx>
Date: Tue, 5 Apr 2011 12:03:10 -0500
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The Xenoprof page, http://xenoprof.sourceforge.net/, asks that
OProfile-related questions be sent to the xen-devel mailing list.

I am interested in passive domain profiling using OProfile. I have
downloaded the 0.9.5 patch, modified it so it applies against 0.9.6 and
built OProfile for Fedora [1]. I have not yet had success performing
passive profiling of a DomU. I am using "Tutorial: Profiling in Xen"
by J. Renato Santos and have some questions.

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

Second, should I expect Xenoprof to work with Linux 2.6.38 and Xen 4.1? I
have observed the following:

        No Xen: works fine.

        Xen Dom0: receive "error: no sample files found: profile
        specification too strict."

        Xen Dom0, module option timer=1: profiling Dom0 works fine but
        I don't see any statistics from DomU; I also see
        "/usr/bin/opcontrol: line 1430: /dev/oprofile/passive_domains:
        Permission denied" In fact, /dev/oprofile/passive_domains does
        not exist. Has the kernel dropped support for the passive
        profiling of domains?

[1] https://bugzilla.redhat.com/show_bug.cgi?id=693596



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