aboutsummaryrefslogtreecommitdiffstats
path: root/contrail-agent/hooks/charmhelpers/core/hugepage.py
diff options
context:
space:
mode:
Diffstat (limited to 'contrail-agent/hooks/charmhelpers/core/hugepage.py')
-rw-r--r--contrail-agent/hooks/charmhelpers/core/hugepage.py69
1 files changed, 69 insertions, 0 deletions
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)