starlingx/config
Code Issues Proposed changes

Introduce PM QoS cpu latency manager for kubelet

Browse Source 
This creates a daemon 'pm-qos-mgr' that monitors kubelet cpu-manager
static cpu assignments and modifies PM QoS CPU wakeup latency to
govern the C-states per CPU.

Guaranteed pods with exclusive CPUs get "low" cpu wakeup latency
policy (the c-state is capped at C1).

Remaining pods (i.e., with default CPUs) get "high" cpu wakeup latency
policy, so the cpu may go into higher c-state if idle.

Change-Id: I8470217dc53b6a7912b5023d8c0b04d966357222
Closes-Bug: 1830545
Signed-off-by: Jim Gauld <james.gauld@windriver.com>
This commit is contained in:
Jim Gauld 2019-05-28 16:34:12 -04:00
parent af499c1e2d
commit 76b1a7a16f
10 changed files with 495 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
centos_iso_image.inc
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@ -43,3 +43,6 @@ playbookconfig
# Platform helm charts
stx-platform-helm
# PM QoS cpu latency manager
pm-qos-mgr

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centos_pkg_dirs
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@ -20,3 +20,4 @@ puppet-modules-wrs/puppet-smapi
puppet-modules-wrs/puppet-fm
playbookconfig
puppet-modules-wrs/puppet-dcdbsync
pm-qos-mgr

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pm-qos-mgr/centos/build_srpm.data Normal file
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SRC_DIR="src"
TIS_PATCH_VER=1

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pm-qos-mgr/centos/pm-qos-mgr.spec Normal file
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%define debug_package %{nil}
%global pypi_name pm_qos_mgr
Name: pm-qos-mgr
Version: 1.0
Release: %{tis_patch_ver}%{?_tis_dist}
Summary: PM QoS CPU wakeup latency manager for kubelet cpu-manager
License: Apache-2.0
Group: base
URL: unknown
Source0: %{name}-%{version}.tar.gz
BuildRequires: git
BuildRequires: python-pbr >= 2.0.0
BuildRequires: python-setuptools
BuildRequires: python2-pip
BuildRequires: systemd-devel
Requires: python-pbr >= 2.0.0
Requires: python-inotify
Requires: systemd
%description
A daemon that monitors kubelet cpu-manager static cpu assignments
and modifies PM QoS CPU wakeup latency.
%define pythonroot %{_libdir}/python2.7/site-packages
%prep
%autosetup -n %{name}-%{version} -S git
# Remove bundled egg-info
rm -rf *.egg-info
%build
export PBR_VERSION=%{version}
%{__python} setup.py build
%install
export PBR_VERSION=%{version}
%{__python} setup.py install --root=%{buildroot} \
--install-lib=%{pythonroot} \
--prefix=%{_prefix} \
--install-data=%{_datadir} \
--single-version-externally-managed
install -p -D -m 664 pm-qos-mgr.service %{buildroot}%{_unitdir}/pm-qos-mgr.service
%post
systemctl enable pm-qos-mgr.service
%clean
rm -rf $RPM_BUILD_ROOT
%files
%defattr(-,root,root,-)
%doc LICENSE
%{_bindir}/*
%{pythonroot}/%{pypi_name}/*
%{pythonroot}/%{pypi_name}-%{version}*.egg-info
%{_unitdir}/*

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pm-qos-mgr/src/LICENSE Normal file
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pm-qos-mgr/src/pm-qos-mgr.service Normal file
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[Unit]
Description=PM QoS CPU wakeup latency manager for kubelet cpu-manager
After=syslog.target network-online.target remote-fs.target sw-patch.service
Before=kubelet.service
[Service]
Type=simple
ExecStart=/usr/bin/pm-qos-mgr
[Install]
WantedBy=multi-user.target

0
pm-qos-mgr/src/pm_qos_mgr/__init__.py Normal file
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pm-qos-mgr/src/pm_qos_mgr/pm_qos_mgr.py Normal file
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#
# Copyright (c) 2019 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#
# Purpose:
# This manager watches for changes in /var/lib/kubelet/cpu_manager_state file.
# This sets appropriate PM QoS resume latency constraints for CPUs
# when kubelet cpu-manager is configured with 'static' policy.
#
# This parses the cpu_manager_state file, deduces the cpu-manager policy,
# and CPU lists of Guaranteed pods versus the remaining Default CPUs.
# Guaranteed pods with exclusive CPUs get "low" cpu wakeup latency policy.
# Default CPUs get "high" cpu wakeup latency policy.
import itertools as it
import json
import logging
import logging.handlers
import os
import pyinotify
import subprocess
import sys
# Global variables
statefile = '/var/lib/kubelet/cpu_manager_state'
pm_script = '/usr/bin/set-cpu-wakeup-latency.sh'
LOG = logging.getLogger(__name__)
def configure_logging(logger, level=logging.DEBUG):
""" Configure logger streams and format. """
LOG.setLevel(level)
syslog_facility = logging.handlers.SysLogHandler.LOG_DAEMON
ch = logging.handlers.SysLogHandler(address='/dev/log',
facility=syslog_facility)
ch.setLevel(level)
formatter = logging.Formatter('%(module)s[%(process)d]: %(message)s')
ch.setFormatter(formatter)
LOG.addHandler(ch)
def format_range_set(items):
""" Generate pretty-printed value of ranges, such as 3-6,12-17. """
ranges = []
for k, iterable in it.groupby(enumerate(sorted(items)),
lambda x: x[1] - x[0]):
rng = list(iterable)
if len(rng) == 1:
s = str(rng[0][1])
else:
s = "%s-%s" % (rng[0][1], rng[-1][1])
ranges.append(s)
return ','.join(ranges)
def range_to_list(csv_range=None):
""" Convert a string of comma separate ranges into an expanded list
of integers. e.g., '1-3,8-9,15' is converted to [1,2,3,8,9,15].
"""
if not csv_range:
return []
ranges = [(lambda L: range(L[0], L[-1] + 1))(map(int, r.split('-')))
for r in csv_range.split(',')]
return [y for x in ranges for y in x]
class ProcessTransientFile(pyinotify.ProcessEvent):
def __init__(self, *args, **kw):
self.policy = None
self.cpusets = {'default': set(),
'guaranteed': set()}
self.update_pm_qos_cpu_latency()
def update_pm_qos_cpu_latency(self, event=None):
if self.policy is not None and self.policy != 'static':
return
if event is not None:
LOG.debug('%s, %s', event.pathname, event.maskname)
# Read JSON formatted state file dictionary
state = {}
try:
with open(statefile, 'r') as f:
state = json.load(f)
except Exception as e:
LOG.error('Could not load: %s, error: %s.', statefile, e)
return
self.policy = str(state['policyName'])
if self.policy != 'static':
return
# Determine default cpuset
if 'defaultCpuSet' not in state:
LOG.error('Missing defaultCpuSet.', statefile)
return
default_cpuranges = str(state['defaultCpuSet'])
default_cpuset = set(range_to_list(csv_range=default_cpuranges))
# Determine guaranteed cpuset
guaranteed_cpuset = set()
if 'entries' in state:
for pod, cpus in state['entries'].items():
cpulist = range_to_list(csv_range=cpus)
guaranteed_cpuset.update(cpulist)
guaranteed_cpuranges = format_range_set(guaranteed_cpuset)
# Update PM QoS resume latency if the set of cpus have changed
if default_cpuset != self.cpusets['default']:
self.cpusets['default'] = default_cpuset.copy()
if default_cpuset:
pm_policy = 'high'
LOG.info('Set PM policy: %s, CPUs: %s',
pm_policy, default_cpuranges)
command = [pm_script, pm_policy, default_cpuranges]
proc = subprocess.Popen(command, stdout=subprocess.PIPE)
output, errors = proc.communicate()
if errors:
LOG.error('Problem with command: %s, error: %s',
command, errors)
if guaranteed_cpuset != self.cpusets['guaranteed']:
self.cpusets['guaranteed'] = guaranteed_cpuset.copy()
if guaranteed_cpuset:
pm_policy = 'low'
LOG.info('Set PM policy: %s, CPUs: %s',
pm_policy, guaranteed_cpuranges)
command = [pm_script, pm_policy, guaranteed_cpuranges]
proc = subprocess.Popen(command, stdout=subprocess.PIPE)
output, errors = proc.communicate()
if errors:
LOG.error('Problem with command: %s, error: %s',
command, errors)
def process_IN_MOVED_TO(self, event):
""" Handler for watched IN_MOVED_TO events.
kubelet cpu-manager overwrites state-file by moving a temp file,
so this is the expected handler.
"""
self.update_pm_qos_cpu_latency(event)
def main():
""" A shell command for pm-qos-daemon. """
configure_logging(LOG, level=logging.INFO)
if os.geteuid() != 0:
LOG.error('Require sudo/root.')
sys.exit(1)
LOG.info('Watching: %s', statefile)
watch_manager = pyinotify.WatchManager()
notifier = pyinotify.Notifier(watch_manager)
flags = pyinotify.IN_MOVED_TO
watch_manager.watch_transient_file(statefile, flags, ProcessTransientFile)
try:
notifier.loop()
except pyinotify.NotifierError, err:
LOG.error('Problem with notifier.loop(), error: %s', err)
if __name__ == "__main__":
main()

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pm-qos-mgr/src/setup.cfg Normal file
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[metadata]
license_files = LICENSE
name = pm_qos_mgr
summary = PM QoS CPU wakeup latency manager for kubelet cpu-manager
author = StarlingX
author-email = starlingx-discuss@lists.starlingx.io
home-page = http://www.starlingx.io/
classifier =
Environment :: OpenStack
Intended Audience :: Information Technology
Intended Audience :: System Administrators
License :: OSI Approved :: Apache Software License
Operating System :: POSIX :: Linux
Programming Language :: Python
Programming Language :: Python :: 2
Programming Language :: Python :: 2.7
Programming Language :: Python :: 3
Programming Language :: Python :: 3.5
[global]
setup-hooks =
pbr.hooks.setup_hook
[files]
packages =
pm_qos_mgr
[entry_points]
console_scripts =
pm-qos-mgr = pm_qos_mgr.pm_qos_mgr:main
[wheel]
universal = 1
[egg_info]
tag_build =
tag_date = 0
tag_svn_revision = 0

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pm-qos-mgr/src/setup.py Normal file
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#
# Copyright (c) 2019 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#
import setuptools
setuptools.setup(
setup_requires=['pbr>=2.0.0'],
pbr=True)