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This is a bug that I discovered when fixing some of the NUMA related 
nova objects. I have a patch that should fix it up shortly.

This is what happens when we don't have any functional testing of stuff 
that is merged into master...

Best,
-jay

On 02/02/2015 11:44 AM, Chris Friesen wrote:
> Hi,
>
> I'm trying to make use of huge pages as described in "http://specs.openstack.org/openstack/nova-specs/specs/kilo/implemented/virt-driver-large-pages.html".  I'm running kilo as of Jan 27th.
>
> I've allocated 10000 2MB pages on a compute node.  "virsh capabilities" on that node contains:
>
>      <topology>
>        <cells num='2'>
>          <cell id='0'>
>            <memory unit='KiB'>67028244</memory>
>            <pages unit='KiB' size='4'>16032069</pages>
>            <pages unit='KiB' size='2048'>5000</pages>
>            <pages unit='KiB' size='1048576'>1</pages>
> ...
>          <cell id='1'>
>            <memory unit='KiB'>67108864</memory>
>            <pages unit='KiB' size='4'>16052224</pages>
>            <pages unit='KiB' size='2048'>5000</pages>
>            <pages unit='KiB' size='1048576'>1</pages>
>
>
> I then restarted nova-compute, I set "hw:mem_page_size=large" on a flavor, and then tried to boot up an instance with that flavor.  I got the error logs below in nova-scheduler.  Is this a bug?
>
>
> Feb  2 16:23:10 controller-0 nova-scheduler Exception during message handling: Cannot load 'mempages' in the base class
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 134, in _dispatch_and_reply
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 177, in _dispatch
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 123, in _do_dispatch
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/oslo/messaging/rpc/server.py", line 139, in inner
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     return func(*args, **kwargs)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/scheduler/manager.py", line 86, in select_destinations
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     filter_properties)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 67, in select_destinations
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     filter_properties)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 138, in _schedule
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     filter_properties, index=num)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/scheduler/host_manager.py", line 391, in get_filtered_hosts
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     hosts, filter_properties, index)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/filters.py", line 77, in get_filtered_objects
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     list_objs = list(objs)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/filters.py", line 43, in filter_all
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     if self._filter_one(obj, filter_properties):
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/scheduler/filters/__init__.py", line 27, in _filter_one
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     return self.host_passes(obj, filter_properties)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/scheduler/filters/numa_topology_filter.py", line 45, in host_passes
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     limits_topology=limits))
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/virt/hardware.py", line 1161, in numa_fit_instance_to_host
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     host_cell, instance_cell, limit_cell)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/virt/hardware.py", line 851, in _numa_fit_instance_cell
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     host_cell, instance_cell)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/virt/hardware.py", line 692, in _numa_cell_supports_pagesize_request
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     avail_pagesize = [page.size_kb for page in host_cell.mempages]
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/objects/base.py", line 72, in getter
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     self.obj_load_attr(name)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib64/python2.7/site-packages/nova/objects/base.py", line 507, in obj_load_attr
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher     _("Cannot load '%s' in the base class") % attrname)
> 2015-02-02 16:23:10.746 37521 TRACE oslo.messaging.rpc.dispatcher NotImplementedError: Cannot load 'mempages' in the base class
>
>
> Thanks,
> Chris
>
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