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

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

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?
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.
 -George

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