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# Copyright 2018 Microsoft Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Requires Python 2.6+ and Openssl 1.0+
import errno
import os
import re
from azurelinuxagent.common import logger
from azurelinuxagent.common.exception import CGroupsException
from azurelinuxagent.common.future import ustr
from azurelinuxagent.ga.cgroupcontroller import _CgroupController, CounterNotFound, MetricValue, MetricsCategory, \
MetricsCounter, _REPORT_EVERY_HOUR
class _MemoryController(_CgroupController):
def __init__(self, name, cgroup_path):
super(_MemoryController, self).__init__(name, cgroup_path)
self._counter_not_found_error_count = 0
def _get_memory_stat_counter(self, counter_name):
"""
Gets the value for the provided counter in memory.stat
"""
try:
with open(os.path.join(self.path, 'memory.stat')) as memory_stat:
#
# Sample file v1:
# # cat memory.stat
# cache 0
# rss 0
# rss_huge 0
# shmem 0
# mapped_file 0
# dirty 0
# writeback 0
# swap 0
# ...
#
# Sample file v2
# # cat memory.stat
# anon 0
# file 147140608
# kernel 1421312
# kernel_stack 0
# pagetables 0
# sec_pagetables 0
# percpu 130752
# sock 0
# ...
#
for line in memory_stat:
re_memory_counter = r'{0}\s+(\d+)'.format(counter_name)
match = re.match(re_memory_counter, line)
if match is not None:
return int(match.groups()[0])
except (IOError, OSError) as e:
if e.errno == errno.ENOENT:
raise
raise CGroupsException("Failed to read memory.stat: {0}".format(ustr(e)))
except Exception as e:
raise CGroupsException("Failed to read memory.stat: {0}".format(ustr(e)))
raise CounterNotFound("Cannot find counter: {0}".format(counter_name))
def get_memory_usage(self):
"""
Collects anon and cache usage for the cgroup and returns as a tuple
Returns anon and cache memory usage for the cgroup as a tuple -> (anon, cache)
:return: Anon and cache memory usage in bytes
:rtype: tuple[int, int]
"""
raise NotImplementedError()
def try_swap_memory_usage(self):
"""
Collects swap usage for the cgroup
:return: Memory usage in bytes
:rtype: int
"""
raise NotImplementedError()
def get_max_memory_usage(self):
"""
Collect max memory usage for the cgroup.
:return: Memory usage in bytes
:rtype: int
"""
raise NotImplementedError()
def get_tracked_metrics(self, **_):
# The log collector monitor tracks anon and cache memory separately.
anon_mem_usage, cache_mem_usage = self.get_memory_usage()
total_mem_usage = anon_mem_usage + cache_mem_usage
return [
MetricValue(MetricsCategory.MEMORY_CATEGORY, MetricsCounter.TOTAL_MEM_USAGE, self.name, total_mem_usage),
MetricValue(MetricsCategory.MEMORY_CATEGORY, MetricsCounter.ANON_MEM_USAGE, self.name, anon_mem_usage),
MetricValue(MetricsCategory.MEMORY_CATEGORY, MetricsCounter.CACHE_MEM_USAGE, self.name, cache_mem_usage),
MetricValue(MetricsCategory.MEMORY_CATEGORY, MetricsCounter.MAX_MEM_USAGE, self.name,
self.get_max_memory_usage(), _REPORT_EVERY_HOUR),
MetricValue(MetricsCategory.MEMORY_CATEGORY, MetricsCounter.SWAP_MEM_USAGE, self.name,
self.try_swap_memory_usage(), _REPORT_EVERY_HOUR)
]
def get_unit_properties(self):
return["MemoryAccounting"]
class MemoryControllerV1(_MemoryController):
def get_memory_usage(self):
# In v1, anon memory is reported in the 'rss' counter
return self._get_memory_stat_counter("rss"), self._get_memory_stat_counter("cache")
def try_swap_memory_usage(self):
# In v1, swap memory should be collected from memory.stat, because memory.memsw.usage_in_bytes reports total Memory+SWAP.
try:
return self._get_memory_stat_counter("swap")
except CounterNotFound as e:
if self._counter_not_found_error_count < 1:
logger.periodic_info(logger.EVERY_HALF_HOUR,
'{0} from "memory.stat" file in the cgroup: {1}---[Note: This log for informational purpose only and can be ignored]'.format(ustr(e), self.path))
self._counter_not_found_error_count += 1
return 0
def get_max_memory_usage(self):
# In v1, max memory usage is reported in memory.max_usage_in_bytes
usage = 0
try:
usage = int(self._get_parameters('memory.max_usage_in_bytes', first_line_only=True))
except Exception as e:
if isinstance(e, (IOError, OSError)) and e.errno == errno.ENOENT: # pylint: disable=E1101
raise
raise CGroupsException("Exception while attempting to read {0}".format("memory.max_usage_in_bytes"), e)
return usage
class MemoryControllerV2(_MemoryController):
def get_memory_usage(self):
# In v2, cache memory is reported in the 'file' counter
return self._get_memory_stat_counter("anon"), self._get_memory_stat_counter("file")
def get_memory_throttled_events(self):
"""
Returns the number of times processes of the cgroup are throttled and routed to perform memory recliam because
the high memory boundary was exceeded.
:return: Number of memory throttling events for the cgroup
:rtype: int
"""
try:
with open(os.path.join(self.path, 'memory.events')) as memory_events:
#
# Sample file:
# # cat memory.events
# low 0
# high 0
# max 0
# oom 0
# oom_kill 0
# oom_group_kill 0
#
for line in memory_events:
match = re.match(r'high\s+(\d+)', line)
if match is not None:
return int(match.groups()[0])
except (IOError, OSError) as e:
if e.errno == errno.ENOENT:
raise
raise CGroupsException("Failed to read memory.events: {0}".format(ustr(e)))
except Exception as e:
raise CGroupsException("Failed to read memory.events: {0}".format(ustr(e)))
raise CounterNotFound("Cannot find memory.events counter: high")
def try_swap_memory_usage(self):
# In v2, swap memory is reported in memory.swap.current
usage = 0
try:
usage = int(self._get_parameters('memory.swap.current', first_line_only=True))
except Exception as e:
if isinstance(e, (IOError, OSError)) and e.errno == errno.ENOENT: # pylint: disable=E1101
raise
raise CGroupsException("Exception while attempting to read {0}".format("memory.swap.current"), e)
return usage
def get_max_memory_usage(self):
# In v2, max memory usage is reported in memory.peak
usage = 0
try:
usage = int(self._get_parameters('memory.peak', first_line_only=True))
except Exception as e:
if isinstance(e, (IOError, OSError)) and e.errno == errno.ENOENT: # pylint: disable=E1101
raise
raise CGroupsException("Exception while attempting to read {0}".format("memory.peak"), e)
return usage
def get_tracked_metrics(self, **_):
metrics = super(MemoryControllerV2, self).get_tracked_metrics()
throttled_value = MetricValue(MetricsCategory.MEMORY_CATEGORY, MetricsCounter.MEM_THROTTLED, self.name,
self.get_memory_throttled_events())
metrics.append(throttled_value)
return metrics
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