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# Copyright 2015-2017 Intel 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.
"""Automation of hugepages management
"""
import os
import re
import subprocess
import logging
import locale
import math
from tools import tasks
from conf import settings
_LOGGER = logging.getLogger(__name__)
_ALLOCATED_HUGEPAGES = False
#
# hugepage management
#
def get_hugepage_size():
"""Return the size of the configured hugepages
"""
hugepage_size_re = re.compile(r'^Hugepagesize:\s+(?P<size_hp>\d+)\s+kB',
re.IGNORECASE)
with open('/proc/meminfo', 'r') as result_file:
data = result_file.readlines()
for line in data:
match = hugepage_size_re.search(line)
if match:
_LOGGER.info('Hugepages size: %s kb', match.group('size_hp'))
return int(match.group('size_hp'))
_LOGGER.error('Could not parse for hugepage size')
return 0
def allocate_hugepages():
"""Allocate hugepages on the fly
"""
hp_size = get_hugepage_size()
if hp_size > 0:
nr_hp = int(math.ceil(settings.getValue('HUGEPAGE_RAM_ALLOCATION')/hp_size))
_LOGGER.info('Will allocate %s hugepages.', nr_hp)
nr_hugepages = 'vm.nr_hugepages=' + str(nr_hp)
try:
tasks.run_task(['sudo', 'sysctl', nr_hugepages],
_LOGGER, 'Trying to allocate hugepages..', True)
except subprocess.CalledProcessError:
_LOGGER.error('Unable to allocate hugepages.')
return False
# pylint: disable=global-statement
global _ALLOCATED_HUGEPAGES
_ALLOCATED_HUGEPAGES = True
return True
else:
_LOGGER.error('Division by 0 will be supported in next release')
return False
def deallocate_hugepages():
"""De-allocate hugepages that were allocated on the fly
"""
# pylint: disable=global-statement
global _ALLOCATED_HUGEPAGES
if _ALLOCATED_HUGEPAGES:
nr_hugepages = 'vm.nr_hugepages= 0'
try:
tasks.run_task(['sudo', 'sysctl', nr_hugepages],
_LOGGER, 'Trying to de-allocate hugepages..', True)
except subprocess.CalledProcessError:
_LOGGER.error('Unable to de-allocate hugepages.')
return False
_ALLOCATED_HUGEPAGES = False
return True
def get_free_hugepages(socket=None):
"""Get the free hugepage totals on the system.
:param socket: optional socket param to get free hugepages on a socket. To
be passed a string.
:returns: hugepage amount as int
"""
hugepage_free_re = re.compile(r'HugePages_Free:\s+(?P<free_hp>\d+)$')
if socket:
if os.path.exists(
'/sys/devices/system/node/node{}/meminfo'.format(socket)):
meminfo_path = '/sys/devices/system/node/node{}/meminfo'.format(
socket)
else:
_LOGGER.info('No hugepage info found for socket %s', socket)
return 0
else:
meminfo_path = '/proc/meminfo'
with open(meminfo_path, 'r') as result_file:
data = result_file.readlines()
for line in data:
match = hugepage_free_re.search(line)
if match:
_LOGGER.info('Hugepages free: %s %s', match.group('free_hp'),
'on socket {}'.format(socket) if socket else '')
return int(match.group('free_hp'))
_LOGGER.info('Could not parse for hugepage size')
return 0
def is_hugepage_available():
"""Check if hugepages are configured/available on the system.
"""
hugepage_size_re = re.compile(r'^Hugepagesize:\s+(?P<size_hp>\d+)\s+kB',
re.IGNORECASE)
# read in meminfo
with open('/proc/meminfo') as mem_file:
mem_info = mem_file.readlines()
# see if the hugepage size is the recommended value
for line in mem_info:
match_size = hugepage_size_re.match(line)
if match_size:
if match_size.group('size_hp') != '1048576':
_LOGGER.info(
'%s%s%s kB',
'Hugepages not configured for recommend 1GB size. ',
'Currently set at ', match_size.group('size_hp'))
num_huge = get_free_hugepages()
if num_huge == 0:
_LOGGER.info('No free hugepages.')
if not allocate_hugepages():
return False
else:
_LOGGER.info('Found \'%s\' free hugepage(s).', num_huge)
return True
def is_hugepage_mounted():
"""Check if hugepages are mounted.
"""
output = subprocess.check_output(['mount'], shell=True)
my_encoding = locale.getdefaultlocale()[1]
for line in output.decode(my_encoding).split('\n'):
if 'hugetlbfs' in line:
return True
return False
def mount_hugepages():
"""Ensure hugepages are mounted. Raises RuntimeError if no configured
hugepages are available.
"""
if not is_hugepage_available():
raise RuntimeError('No Hugepages configured.')
if is_hugepage_mounted():
return
if not os.path.exists(settings.getValue('HUGEPAGE_DIR')):
tasks.run_task(['sudo', 'mkdir', settings.getValue('HUGEPAGE_DIR')], _LOGGER,
'Creating directory ' + settings.getValue('HUGEPAGE_DIR'), True)
try:
tasks.run_task(['sudo', 'mount', '-t', 'hugetlbfs', 'nodev',
settings.getValue('HUGEPAGE_DIR')],
_LOGGER, 'Mounting hugepages...', True)
except subprocess.CalledProcessError:
_LOGGER.error('Unable to mount hugepages.')
def umount_hugepages():
"""Ensure hugepages are unmounted.
"""
if not is_hugepage_mounted():
return
try:
tasks.run_task(['sudo', 'umount', settings.getValue('HUGEPAGE_DIR')],
_LOGGER, 'Unmounting hugepages...', True)
except subprocess.CalledProcessError:
_LOGGER.error('Unable to umount hugepages.')
if not deallocate_hugepages():
_LOGGER.error('Unable to deallocate previously allocated hugepages.')
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