Hi Jason,

As Josh mentioned, the screenshot shows that demand as seen by Hyper-V
is still quite high compared to what is displayed inside the guest. If
this number doesn't settle, then Hyper-V would have no reason to reclaim
memory. Does the Hyper-V memory demand number ever settle after some
time?

With the "free" command, you should be seeing the following if memory is
being returned to the host successfully:

- Because Linux guests return memory via ballooning instead of hot-
unplug; you'll never see the "total" memory decrease (i.e. it'll always
reflect the spike)

- Instead, you should see that "used" memory increases and "free" memory
decreases. This indicates the kernel allocated some memory so no one can
use it, and that Hyper-V has reclaimed this memory. (i.e. the used
memory should increase by roughly the amount that the host has
reclaimed)

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https://bugs.launchpad.net/bugs/1584597

Title:
  Hyper-V Memory Ballooning re-broken in 16.04

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