Re: [Xen-devel] [Patch] support of lock profiling in Xen

To:	Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] [Patch] support of lock profiling in Xen
From:	Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
Date:	Thu, 08 Oct 2009 10:38:46 +0200
Cc:	"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date:	Thu, 08 Oct 2009 01:39:15 -0700
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Keir Fraser wrote:
> On 08/10/2009 08:48, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxx> wrote:
> 
>> Comments welcome :-)
> 
> There's also the question of whether this really gets you useful extra info
> than can be digested from a xentrace run. I suppose at least the info is
> easier to understand, and not many people know how to drive xentrace.

It helped me a lot for narrowing down my performance problem with a 8 vcpu
BS2000 system (this was the main reason I made the patch).
Finding such a problem in xentrace is quite a bit of work. xentrace produced
over 500 MB of data in 30 seconds, while reading the xenlockprof output
revealed the bottleneck in seconds.

And I think the lock profiling tool is much better for evaluating
optimizations in Xen regarding lock conflicts, if the differences are only
a few percent.

Juergen

-- 
Juergen Gross                 Principal Developer Operating Systems
TSP ES&S SWE OS6                       Telephone: +49 (0) 89 636 47950
Fujitsu Technolgy Solutions               e-mail: juergen.gross@xxxxxxxxxxxxxx
Otto-Hahn-Ring 6                        Internet: ts.fujitsu.com
D-81739 Muenchen                 Company details: ts.fujitsu.com/imprint.html

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Re: [Xen-devel] [Patch] support of lock profiling in Xen