70 lines
2.6 KiB
Python
70 lines
2.6 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2015 Canonical Limited.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import yaml
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from charmhelpers.core import fstab
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from charmhelpers.core import sysctl
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from charmhelpers.core.host import (
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add_group,
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add_user_to_group,
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fstab_mount,
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mkdir,
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)
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from charmhelpers.core.strutils import bytes_from_string
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from subprocess import check_output
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def hugepage_support(user, group='hugetlb', nr_hugepages=256,
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max_map_count=65536, mnt_point='/run/hugepages/kvm',
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pagesize='2MB', mount=True, set_shmmax=False):
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"""Enable hugepages on system.
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Args:
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user (str) -- Username to allow access to hugepages to
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group (str) -- Group name to own hugepages
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nr_hugepages (int) -- Number of pages to reserve
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max_map_count (int) -- Number of Virtual Memory Areas a process can own
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mnt_point (str) -- Directory to mount hugepages on
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pagesize (str) -- Size of hugepages
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mount (bool) -- Whether to Mount hugepages
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"""
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group_info = add_group(group)
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gid = group_info.gr_gid
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add_user_to_group(user, group)
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if max_map_count < 2 * nr_hugepages:
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max_map_count = 2 * nr_hugepages
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sysctl_settings = {
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'vm.nr_hugepages': nr_hugepages,
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'vm.max_map_count': max_map_count,
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'vm.hugetlb_shm_group': gid,
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}
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if set_shmmax:
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shmmax_current = int(check_output(['sysctl', '-n', 'kernel.shmmax']))
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shmmax_minsize = bytes_from_string(pagesize) * nr_hugepages
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if shmmax_minsize > shmmax_current:
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sysctl_settings['kernel.shmmax'] = shmmax_minsize
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sysctl.create(yaml.dump(sysctl_settings), '/etc/sysctl.d/10-hugepage.conf')
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mkdir(mnt_point, owner='root', group='root', perms=0o755, force=False)
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lfstab = fstab.Fstab()
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fstab_entry = lfstab.get_entry_by_attr('mountpoint', mnt_point)
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if fstab_entry:
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lfstab.remove_entry(fstab_entry)
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entry = lfstab.Entry('nodev', mnt_point, 'hugetlbfs',
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'mode=1770,gid={},pagesize={}'.format(gid, pagesize), 0, 0)
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lfstab.add_entry(entry)
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if mount:
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fstab_mount(mnt_point)
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