libvirt users - Oct 2015 - GUEST Memory statistics secret revealed ...

Hi,

I'm wondering how to explain following metrics I got from libvirt,
regarding memory stats for the two GUESTS running on my host.



1)      virDomainGetXMLDesc()  shows these values :

memmax (1024000.000000) memcurrent(1024000.000000)
memmax (2048000.000000) .memcurrent(2048000.000000)




2)      As values returned by virDomainMemoryStats(), I got these values :

VIR_DOMAIN_MEMORY_STAT_ACTUAL_BALLOON:
active_balloon (1024000.000000)
active_balloon (2048000.000000)

VIR_DOMAIN_MEMORY_STAT_RSS:
rss(1194195.312500)
rss(2039269.531250



3)      By using cgroup counters "memory.usage_in_bytes" for both
Guests, I got these values :

memusage (1 207 207 031 250)
memusage (2 834 503 906 250)

How is it possible to have a balloon size equal to memcurrent ?
What "memory.usage_in_bytes" stands for (it's the maximum value of
the three metrics I got for each GUEST) ?


FYI , I use a 1.2.8  libvirt.

Thanks.

Reagrds,

J.P. Ribeauville


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jpribeauville@axway.com<mailto:jpribeauville@axway.com>
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