Re: about xenoprof

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

On 04/15/2015 09:53 AM, George Dunlap wrote:
> On Tue, Apr 14, 2015 at 5:52 AM, 蒋雄伟(蒋冲) <xiongwei.jiang@alibaba-inc.com> wrote:
>> Hi, everyone:
>>
>>
>>
>> There is no patch for OProfile above 0.9.5 in website
>> http://xenoprof.sourceforge.net/ . why? Does it mean we don’t need the patch
>> for OProfile user level tools if we use 0.9.5 above ?
> I believe at some point the xenoprof patches were merged into
> oprofile; so things may Just Work.

I don't think they ever were. The hypervisor has oprofile support but 
oprofile toolstack and kernels required patches and these patches must 
be rather out-of-date. I actually think (and I may be very wrong) that 
last linux patch was before 3.0 was released.

>
> But there hasn't been a lot of maintenance of the xenoprof code in
> general -- Boris, are there any resources / instructions for how to
> use the perf stuff you've been working on?   Would that be a better
> route to go down than trying to learn about oprofile?

Porting xenoprofile to a recent Linux tree may be somewhat painful. I 
did it last a couple of year ago and did not particularly enjoy it, to 
be honest.

As for perf, the hypervisor can be updated with patches from a recent 
post, for example 
http://lists.xenproject.org/archives/html/xen-devel/2015-04/msg00878.html.

I haven't posted Linux patches but I probably should publish them in a 
public tree. I can provide them as a tarball separately in the meantime, 
if there is interest. The perf toolstack changes (essentially to map 
addresses to symbols for hypervisor) are stuck at about linux 3.17 
timeframe, I haven't updated them since then.

-boris





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