[Xen-API] RRD library (was Re: Proposal to change committers for the XAPI Project)

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

On 30 May 2014, at 13:49, John Else <john.else@xxxxxxxxxx> wrote:
> 
> I've also been working on a library to simplify transmission of RRD data 
> (i.e. performance metrics) between domains [1], and integrating this with the 
> RRD daemon's plugin library [2].
> 

Thanks for the RRD library link -- I hadnt seen this before and it looks very 
useful for Xen tracing in MirageOS! A few questions while reading through the 
source:

- Rrd_io just exposes a single Resource_closed exception and no other values.  
That's perhaps easier to encode in the return value?

- Rrd_reader is functorized on its transport mechanism (for Gnt selection).  
This should mean that the library can compile as a stub domain on Mirage, as 
well as using the /dev/gnt* interfaces on Linux.  Is the current usecase to run 
in dom0 or a separate RRD domain?

- Have you considered using vchan to let other tools capture the rrd stream 
more easily?

best,
Anil


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