Re: [Xen-devel] [PATCH 4 of 6 v2] xen: tracing: report where a VCPU wakes up

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Fri, 2012-12-14 at 19:57 +0000, George Dunlap wrote: 
> On 12/12/12 02:52, Dario Faggioli wrote:
> > When looking at traces, it turns out to be useful to know where a
> > waking-up VCPU is being queued. Yes, that is always the CPU where
> > it ran last, but that information can well be lost in past trace
> > records!
> 
> When you say "lost in past trace records", do you primarily mean that 
> the records themselves have been lost (due to the per-cpu trace buffers 
> filling up), or do you mean that it may be way way back and you don't 
> want to go back and find it?
> 
The latter... I'm quite lazy when looking at traces! :-P

> If the latter, I think the best thing to do would be to just augment 
> xenalyze to keep track of that information and print it when it sees the 
> wake record.
> 
I agree, I'll kill this patch for now, and investigate further solution
along the line you suggested in the future.

Thanks and Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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