Re: [Patch] support of lock profiling in Xen

[Juergen Gross <juergen.gross@ts.fujitsu.com>]

Keir Fraser wrote:
> On 08/10/2009 08:48, "Juergen Gross" <juergen.gross@ts.fujitsu.com> 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

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Juergen Gross                 Principal Developer Operating Systems
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