[Libvir] collectd libvirtstats plugin (version 1, for discussion only)

Attached is a plugin allowing collectd to use libvirt to collect CPU, disk and network statistics for domains. There are a few problems with it at the moment, described below. Firstly just to say that this is a patch against the released collectd 4.2.0. I need to pull out the GIT repository and rebase the patch against that. Any other comments, most welcome! Usage ----- With this patch you should be able to collect stats by adding the following to your collectd.conf file: LoadPlugin libvirtstats <Plugin libvirtstats> Connection "xen:///" </Plugin> 'collectd' only needs to be running on the host. It uses libvirt to collect stats for each guest, via mechanisms in the hypervisor or host operating system. Requirements ------------ libvirt >= 0.3.3 and libxml2. The configure file should auto-detect the requirements and configure libvirtstats plugin only if they are available. Problems -------- I can't seem to get the ignorelist to do anything at all. It seems like it includes all the domains and devices, no matter what I specify in the configuration file and what the state of IgnoreSelected is set to. In the types.db, I have set the max for virt_cpu_total to be 256,000,000,000. The max CPU usage for a single CPU is 1 billion nanoseconds per second, but virt_cpu_total is for all CPUs in the system, and there could be (in theory) an unlimited number of CPUs, so an unlimited max. Therefore I have assumed here that max CPUs = 256. I'm using CSV output, which works, but it seems to report the aggregate counter values instead of the differences. Is that to be expected? Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903