[Xen-users] How to monitor memory in a Linux Xen DomU with a balloon driver?

[Charles <c@xxxxxxxxxxxxxxxxxxxx>]

How can we detect that a DomU is running out of memory, that the balloon 
driver has released up to maxmem?
I tried ...
# find /sys -iname '*xen*'
...
# find /proc -iname '*xen*'
...
# for f in $(find /sys/bus/xen_memory /sys/devices/system/xen_memory 
-type f); do echo === $f ===; cat $f 2>/dev/null; done
... but did not identify data for a solution.

Long ago /proc/xen/balloon could be used.

For Debian Stretch DomUs we used to monitor memory implicitly by 
monitoring swap; when swap space was significantly used, the balloon 
driver had released all it could.  That doesn't work for Debian Buster; 
swap has been seen 100% used while free and buffers have had ~half the 
Xen "memory".
Charles

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