aaedbbe0eb
We need more statistics, including IPC, cache references and cache misses, to do performance tuning. This patch introduces four new meters to get them. Change-Id: Icb21eeed0e004450556176d01520784acd98002e
129 lines
5.0 KiB
Python
129 lines
5.0 KiB
Python
# Copyright 2016 Intel
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import abc
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import collections
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from oslo_log import log
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import ceilometer
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from ceilometer.agent import plugin_base
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from ceilometer.compute import pollsters
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from ceilometer.compute.pollsters import util
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from ceilometer.compute.virt import inspector as virt_inspector
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from ceilometer.i18n import _LE, _LW
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from ceilometer import sample
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LOG = log.getLogger(__name__)
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PerfEventsData = collections.namedtuple('PerfEventsData',
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['cpu_cycles', 'instructions',
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'cache_references', 'cache_misses'])
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class _PerfEventsPollster(pollsters.BaseComputePollster):
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CACHE_KEY_MEMORY_BANDWIDTH = 'perf-events'
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def _populate_cache(self, inspector, cache, instance):
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i_cache = cache.setdefault(self.CACHE_KEY_MEMORY_BANDWIDTH, {})
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if instance.id not in i_cache:
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perf_events = self.inspector.inspect_perf_events(
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instance, self._inspection_duration)
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i_cache[instance.id] = PerfEventsData(
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perf_events.cpu_cycles,
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perf_events.instructions,
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perf_events.cache_references,
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perf_events.cache_misses,
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)
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return i_cache[instance.id]
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@abc.abstractmethod
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def _get_samples(self, instance, c_data):
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"""Return one or more Samples."""
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def _get_sample_total_and_local(self, instance, _name, _unit,
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c_data, _element):
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"""Total / local Pollster and return one Sample"""
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return [util.make_sample_from_instance(
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instance,
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name=_name,
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type=sample.TYPE_GAUGE,
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unit=_unit,
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volume=getattr(c_data, _element),
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)]
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def get_samples(self, manager, cache, resources):
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self._inspection_duration = self._record_poll_time()
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for instance in resources:
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try:
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c_data = self._populate_cache(
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self.inspector,
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cache,
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instance,
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)
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for s in self._get_samples(instance, c_data):
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yield s
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except virt_inspector.InstanceNotFoundException as err:
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# Instance was deleted while getting samples. Ignore it.
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LOG.debug('Exception while getting samples %s', err)
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except virt_inspector.InstanceShutOffException as e:
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LOG.debug('Instance %(instance_id)s was shut off while '
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'getting samples of %(pollster)s: %(exc)s',
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{'instance_id': instance.id,
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'pollster': self.__class__.__name__, 'exc': e})
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except virt_inspector.NoDataException as e:
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LOG.warning(_LW('Cannot inspect data of %(pollster)s for '
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'%(instance_id)s, non-fatal reason: %(exc)s'),
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{'pollster': self.__class__.__name__,
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'instance_id': instance.id, 'exc': e})
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raise plugin_base.PollsterPermanentError(resources)
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except ceilometer.NotImplementedError:
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# Selected inspector does not implement this pollster.
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LOG.debug('Obtaining perf events is not implemented'
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' for %s', self.inspector.__class__.__name__)
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except Exception as err:
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LOG.exception(_LE('Could not get perf events for '
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'%(id)s: %(e)s'), {'id': instance.id,
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'e': err})
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class PerfEventsCPUCyclesPollster(_PerfEventsPollster):
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def _get_samples(self, instance, c_data):
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return self._get_sample_total_and_local(
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instance, 'perf.cpu.cycles', '', c_data, 'cpu_cycles')
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class PerfEventsInstructionsPollster(_PerfEventsPollster):
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def _get_samples(self, instance, c_data):
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return self._get_sample_total_and_local(
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instance, 'perf.instructions', '', c_data, 'instructions')
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class PerfEventsCacheReferencesPollster(_PerfEventsPollster):
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def _get_samples(self, instance, c_data):
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return self._get_sample_total_and_local(
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instance, 'perf.cache.references', '', c_data, 'cache_references')
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class PerfEventsCacheMissesPollster(_PerfEventsPollster):
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def _get_samples(self, instance, c_data):
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return self._get_sample_total_and_local(
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instance, 'perf.cache.misses', '', c_data, 'cache_misses')
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