From 711967ae9639095ce41500bb0e6f80c8b80fab95 Mon Sep 17 00:00:00 2001 From: Stuart Mackie Date: Tue, 25 Jul 2017 10:37:57 -0700 Subject: Contrail charms Change-Id: I2d259d03f63fce38348b8384e26ac23e3fce44a8 Signed-off-by: Stuart Mackie --- contrail-agent/hooks/charmhelpers/core/hugepage.py | 69 ++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 contrail-agent/hooks/charmhelpers/core/hugepage.py (limited to 'contrail-agent/hooks/charmhelpers/core/hugepage.py') diff --git a/contrail-agent/hooks/charmhelpers/core/hugepage.py b/contrail-agent/hooks/charmhelpers/core/hugepage.py new file mode 100644 index 0000000..54b5b5e --- /dev/null +++ b/contrail-agent/hooks/charmhelpers/core/hugepage.py @@ -0,0 +1,69 @@ +# -*- coding: utf-8 -*- + +# Copyright 2014-2015 Canonical Limited. +# +# 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. + +import yaml +from charmhelpers.core import fstab +from charmhelpers.core import sysctl +from charmhelpers.core.host import ( + add_group, + add_user_to_group, + fstab_mount, + mkdir, +) +from charmhelpers.core.strutils import bytes_from_string +from subprocess import check_output + + +def hugepage_support(user, group='hugetlb', nr_hugepages=256, + max_map_count=65536, mnt_point='/run/hugepages/kvm', + pagesize='2MB', mount=True, set_shmmax=False): + """Enable hugepages on system. + + Args: + user (str) -- Username to allow access to hugepages to + group (str) -- Group name to own hugepages + nr_hugepages (int) -- Number of pages to reserve + max_map_count (int) -- Number of Virtual Memory Areas a process can own + mnt_point (str) -- Directory to mount hugepages on + pagesize (str) -- Size of hugepages + mount (bool) -- Whether to Mount hugepages + """ + group_info = add_group(group) + gid = group_info.gr_gid + add_user_to_group(user, group) + if max_map_count < 2 * nr_hugepages: + max_map_count = 2 * nr_hugepages + sysctl_settings = { + 'vm.nr_hugepages': nr_hugepages, + 'vm.max_map_count': max_map_count, + 'vm.hugetlb_shm_group': gid, + } + if set_shmmax: + shmmax_current = int(check_output(['sysctl', '-n', 'kernel.shmmax'])) + shmmax_minsize = bytes_from_string(pagesize) * nr_hugepages + if shmmax_minsize > shmmax_current: + sysctl_settings['kernel.shmmax'] = shmmax_minsize + sysctl.create(yaml.dump(sysctl_settings), '/etc/sysctl.d/10-hugepage.conf') + mkdir(mnt_point, owner='root', group='root', perms=0o755, force=False) + lfstab = fstab.Fstab() + fstab_entry = lfstab.get_entry_by_attr('mountpoint', mnt_point) + if fstab_entry: + lfstab.remove_entry(fstab_entry) + entry = lfstab.Entry('nodev', mnt_point, 'hugetlbfs', + 'mode=1770,gid={},pagesize={}'.format(gid, pagesize), 0, 0) + lfstab.add_entry(entry) + if mount: + fstab_mount(mnt_point) -- cgit 1.2.3-korg