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Re: [Xen-devel] domains being migrated state message improvements

On 02/05/14 16:47, Stefan Parvu wrote:
>>> However, the information is stale by the time it is displayed.  It is
>>> not really appropriate to be consumed by anything other than an eyeball.
>> Agreed. And even if someone disagrees I think it is up to those tools to
>> accept whatever the output is, even if that includes "nonsensical"
>> results.
> So why do we have xentop then ?

So a human can take a look at a system and see if anything looks
obviously wrong.

>  Or other tools ? To consume your
> internal data, and more or less to ensure it is legit.
> Remember, that we might have cases where people *are* consuming xentop
> results.

How? it uses ncurses to be interactive on the terminal.  Collecting this
output with automated tools is impractical.

>  Or other tool(s), based on results coming from Xen kernel. 

This is a bigger issue.  The values are exposed in libxc and somewhat
more statically to the shell via xl

> So if I want to store 1 year statistics of all guests, as time series, I
> expect to see more or less reliable data. Right ? Analyzing data will
> turn in a mess.

What are you looking to collect?  It surely isn't direct scheduling data.


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