On 08/09/2012 11:13 AM, Parakkal, Navin S wrote: > Hi, > Is the array mstats returned by virDomainMemoryStats call cummulative > or snapshot of the counter at that particular time ? I was of the opinion > that is cummulative like the /proc counters but this counter seems to go > backwards ie next snapshot value is less than the current one which makes me > think these are snapshot values . I'm using RHEL 6.3 libvirt version 0.9.10.
For qemu, virDomainMemoryStats parses the output of the qemu 'query-balloon' monitor command; I'd have to check the qemu source code to see if these stats are cumulative, but that's what I'd expect. If they are not, then libvirt has a bug for not accumulating the stats locally, because I think the libvirt API has to be cumulative. If reading the stats resets them to 0 (ie. stats are a self-resetting snapshot), and you have more than one client both trying to read stats, then the stats will read short. -- Eric Blake [email protected] +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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