Introduce PM QoS cpu latency manager for kubelet

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

View File

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

View File

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

View File

@ -0,0 +1,2 @@
SRC_DIR="src"
TIS_PATCH_VER=1

View File

@ -0,0 +1,61 @@
%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}/*

202
pm-qos-mgr/src/LICENSE Normal file
View File

@ -0,0 +1,202 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and
attribution notices from the Source form of the Work,
excluding those notices that do not pertain to any part of
the Derivative Works; and
(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
include a readable copy of the attribution notices contained
within such NOTICE file, excluding those notices that do not
pertain to any part of the Derivative Works, in at least one
of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
documentation, if provided along with the Derivative Works; or,
within a display generated by the Derivative Works, if and
wherever such third-party notices normally appear. The contents
of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
as modifying the License.
You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
origin of the Work and reproducing the content of the NOTICE file.
7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright [yyyy] [name of copyright owner]
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.

View File

@ -0,0 +1,11 @@
[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

View File

View File

@ -0,0 +1,165 @@
#
# 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()

38
pm-qos-mgr/src/setup.cfg Normal file
View File

@ -0,0 +1,38 @@
[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

12
pm-qos-mgr/src/setup.py Normal file
View File

@ -0,0 +1,12 @@
#
# 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)