def install_hugepages():
""" Configure hugepages """
hugepage_config = config('hugepages')
if hugepage_config:
# TODO: defaults to 2M - this should probably be configurable
# and support multiple pool sizes - e.g. 2M and 1G.
hugepage_size = 2048
if hugepage_config.endswith('%'):
import psutil
mem = psutil.virtual_memory()
hugepage_config_pct = hugepage_config.strip('%')
hugepage_multiplier = float(hugepage_config_pct) / 100
hugepages = int((mem.total * hugepage_multiplier) / hugepage_size)
else:
hugepages = int(hugepage_config)
mnt_point = '/run/hugepages/kvm'
hugepage_support(
'nova',
mnt_point=mnt_point,
group='root',
nr_hugepages=hugepages,
mount=False,
set_shmmax=True,
)
if subprocess.call(['mountpoint', mnt_point]):
fstab_mount(mnt_point)
rsync(
charm_dir() + '/files/qemu-hugefsdir',
'/etc/init.d/qemu-hugefsdir'
)
subprocess.check_call('/etc/init.d/qemu-hugefsdir')
subprocess.check_call(['update-rc.d', 'qemu-hugefsdir', 'defaults'])
def _add_hp_fstab_mount(pagesize, mount=True):
mnt_point = '/dev/hugepages{}'.format(pagesize)
mkdir(mnt_point, owner='root', group='root', perms=0o755)
lfstab = fstab.Fstab()
fstab_entry = lfstab.get_entry_by_attr('mountpoint', mnt_point)
if fstab_entry:
lfstab.remove_entry(fstab_entry)
entry = lfstab.Entry('hugetlbfs', mnt_point, 'hugetlbfs',
'pagesize={}'.format(pagesize), 0, 0)
lfstab.add_entry(entry)
if mount:
fstab_mount(mnt_point)
def _add_hp_fstab_mount(pagesize, mount=True):
log("Add {} mountpoint from fstab".format(pagesize))
mnt_point = '/dev/hugepages{}'.format(pagesize)
mkdir(mnt_point, owner='root', group='root', perms=0o755)
lfstab = fstab.Fstab()
fstab_entry = lfstab.get_entry_by_attr('mountpoint', mnt_point)
if fstab_entry:
lfstab.remove_entry(fstab_entry)
# use different device name for 1G and 2M.
# this name actually is not used by the system
# but add_antry filter by device name.
device = 'hugetlbfs{}'.format(pagesize)
entry = lfstab.Entry(device, mnt_point, 'hugetlbfs',
'pagesize={}'.format(pagesize), 0, 0)
lfstab.add_entry(entry)
if mount:
fstab_mount(mnt_point)
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)
def install_hugepages():
""" Configure hugepages """
hugepage_config = config('hugepages')
if hugepage_config:
mnt_point = '/run/hugepages/kvm'
hugepage_support(
'nova',
mnt_point=mnt_point,
group='root',
nr_hugepages=get_hugepage_number(),
mount=False,
set_shmmax=True,
)
if subprocess.call(['mountpoint', mnt_point]):
fstab_mount(mnt_point)
rsync(
charm_dir() + '/files/qemu-hugefsdir',
'/etc/init.d/qemu-hugefsdir'
)
subprocess.check_call('/etc/init.d/qemu-hugefsdir')
subprocess.check_call(['update-rc.d', 'qemu-hugefsdir', 'defaults'])
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)
