[Pkg-xen-devel] Bug#927071: xen: More balloon-leak observation

[Elliott Mitchell]

Refering to this as "balloon-leak" as it looks sort of like a
memory-leak, but is instead memory disappearing into the balloon.

There are two things which have been happening more recently which may
have exaggerated this problem.  First, one of the DomUs is acting as a
fileserver and that has been getting more usage recently.  Second, I've
been testing block-device hotplug as a mechanism to transfer data between
VMs (xl block-detach from one VM, then xl block-attach to another VM).

The DomUs appear absolutely uneffected by this.  Even as Dom0 has gotten
to a situation where `shutdown -r now` fails, the DomUs appear to be
chugging away with no problems.

There is plenty of free memory for creating additional VMs (perhaps too
much, and that confused Xen?), so this is really puzzling that memory is
being ballooned away from Dom0.  At this point I plan after the next
restart to double the allocation for Dom0 and see whether Dom0 is able
to last more than a week.


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