docs: document virtio-balloon stats

Document statistics added in commits

    commit a0d06486b4
    Author: Denis V. Lunev <den@openvz.org>
    Date:   Wed Feb 24 10:50:48 2016 +0300

        virtio-balloon: add 'available' counter

and

    commit bf1e7140ef
    Author: Tomáš Golembiovský <tgolembi@redhat.com>
    Date:   Tue Dec 5 13:14:46 2017 +0100

        virtio-balloon: include statistics of disk/file caches

Signed-off-by: Tomáš Golembiovský <tgolembi@redhat.com>
Reviewed-by: Jonathan Helman <jonathan.helman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Tomáš Golembiovský 2018-02-19 13:43:44 +01:00 committed by Michael S. Tsirkin
parent b7a7bb358f
commit c5e931640c

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@ -32,6 +32,8 @@ which will return a dictionary containing:
- stat-minor-faults
- stat-free-memory
- stat-total-memory
- stat-available-memory
- stat-disk-caches
o A key named last-update, which contains the last stats update
timestamp in seconds. Since this timestamp is generated by the host,