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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+=====================================================
+Enabled qemu memory balloon stats when boot instance
+=====================================================
+
+https://blueprints.launchpad.net/nova/+spec/enabled-qemu-memballoon-stats
+
+We can get vm memory stats from libvirt API 'virDomainMemoryStats', it help
+telemetry module like as: Ceilometer to collect vm memory usage, but by
+default the memory statistical feature is disable in qemu, we need to add
+stats period in order to enabled memory statistical.
+
+Problem description
+===================
+
+By default, the memory statistical feature is disable in qemu, we need to
+add stats period in order to enabled memory statistical, like this::
+
+    <memballoon model='virtio'>
+      <stats period='10'/>
+    </memballoon>
+
+Add memballoon device stat period in libvirt.xml when boot instance.
+
+Actual memory statistical works on libvirt 1.1.1+ and qemu 1.5+, and need a
+guest driver that supports the feature, but booting instance with memory stats
+period does not lead to be failure on libvirt 0.9.6+ and qemu 1.0+.
+
+Refer to [1] for libvirt API 'virDomainMemoryStats' details.
+
+Refer to [2] for memballoon details in libvirt.xml.
+
+Details of enabled memory stats: [3]
+
+
+Proposed change
+===============
+
+* Add the option 'mem_stats_period_seconds' into nova.conf(libvirt section).
+* Enable stats period of memballoon device, if user boot instance when
+  mem_stats_period_seconds > 0. mem_stats_period_seconds is number of seconds
+  to memory usage statistics period. By default mem_stats_period_seconds=10.
+
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+User need to prepare suitable balloon driver in image, particularly for windows
+guests, most modern Linuxes have it built in. Booting instance will be
+successful without image balloon driver, just can't get guest memory stat from
+'virDomainMemoryStats' API.
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+Add a new option 'mem_stats_period_seconds' in nova.conf libvirt section.
+By default mem_stats_period_seconds=10, the stats feature is enable,
+mem_stats_period_seconds is number of seconds to memory usage statistics
+period. If mem_stats_period_seconds <= 0, the feature is disable.
+
+Developer impact
+----------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  <kiwik-chenrui>
+
+Work Items
+----------
+
+* Add a LibvirtConfigMemoryBalloon class inherit from LibvirtConfigGuestDevice.
+* Changes to be made to the libvirt driver get_guest_config method to check
+  the option 'mem_stats_period_seconds' in nova.conf, during the boot of the
+  instance.
+* If mem_stats_period_seconds>0, set stats period of memory balloon device in
+  the instance.
+
+
+Dependencies
+============
+
+* libvirt 1.1.1+
+* qemu 1.5+
+* guest driver that supports memory balloon stats
+
+
+Testing
+=======
+
+Unit tests and tempest tests will verify this function. Compatibility will be
+verified, boot instance with 'mem_stats_period_seconds' on current devstack
+environment(libvirt0.9.8 and qemu1.0.0).
+
+Memory stats don't work in current gate environment, see details in
+Dependencies section. Full test need to ensure the devstack VM gate has updated
+libvirt, qemu versions and guest driver compatibility.
+
+
+Documentation Impact
+====================
+
+1. By default this feature is enabled, 'mem_stats_period_seconds'=10. If you
+   want to change the stat period, please modify nova.conf.
+
+2. mem_stats_period_seconds is number of seconds to memory usage statistics
+   period.
+
+3. If you set mem_stats_period_seconds<=0, the memory stats will be disabled,
+   by default mem_stats_period_seconds=10.
+
+This blueprint just add stats period into memory balloon device, it is not
+sufficient to guarantee this feature will work because you need to meet the
+requirements in dependencies section, and you need to handle the case where
+the API 'virDomainMemoryStats' call returns no data(not in scope of this bp).
+
+
+References
+==========
+
+* [1] http://libvirt.org/html/libvirt-libvirt.html#virDomainMemoryStats
+* [2] http://libvirt.org/formatdomain.html#elementsMemBalloon
+* [3] http://paste.openstack.org/show/78624/