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:
parent
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76b1a7a16f
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@ -43,3 +43,6 @@ playbookconfig
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# Platform helm charts
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# Platform helm charts
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stx-platform-helm
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stx-platform-helm
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# PM QoS cpu latency manager
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pm-qos-mgr
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@ -20,3 +20,4 @@ puppet-modules-wrs/puppet-smapi
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puppet-modules-wrs/puppet-fm
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puppet-modules-wrs/puppet-fm
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playbookconfig
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playbookconfig
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puppet-modules-wrs/puppet-dcdbsync
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puppet-modules-wrs/puppet-dcdbsync
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pm-qos-mgr
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@ -0,0 +1,2 @@
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SRC_DIR="src"
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TIS_PATCH_VER=1
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@ -0,0 +1,61 @@
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%define debug_package %{nil}
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%global pypi_name pm_qos_mgr
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Name: pm-qos-mgr
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Version: 1.0
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Release: %{tis_patch_ver}%{?_tis_dist}
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Summary: PM QoS CPU wakeup latency manager for kubelet cpu-manager
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License: Apache-2.0
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Group: base
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URL: unknown
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Source0: %{name}-%{version}.tar.gz
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BuildRequires: git
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BuildRequires: python-pbr >= 2.0.0
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BuildRequires: python-setuptools
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BuildRequires: python2-pip
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BuildRequires: systemd-devel
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Requires: python-pbr >= 2.0.0
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Requires: python-inotify
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Requires: systemd
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%description
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A daemon that monitors kubelet cpu-manager static cpu assignments
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and modifies PM QoS CPU wakeup latency.
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%define pythonroot %{_libdir}/python2.7/site-packages
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%prep
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%autosetup -n %{name}-%{version} -S git
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# Remove bundled egg-info
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rm -rf *.egg-info
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%build
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export PBR_VERSION=%{version}
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%{__python} setup.py build
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%install
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export PBR_VERSION=%{version}
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%{__python} setup.py install --root=%{buildroot} \
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--install-lib=%{pythonroot} \
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--prefix=%{_prefix} \
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--install-data=%{_datadir} \
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--single-version-externally-managed
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install -p -D -m 664 pm-qos-mgr.service %{buildroot}%{_unitdir}/pm-qos-mgr.service
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%post
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systemctl enable pm-qos-mgr.service
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%clean
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rm -rf $RPM_BUILD_ROOT
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%files
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%defattr(-,root,root,-)
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%doc LICENSE
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%{_bindir}/*
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%{pythonroot}/%{pypi_name}/*
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%{pythonroot}/%{pypi_name}-%{version}*.egg-info
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||||||
|
%{_unitdir}/*
|
|
@ -0,0 +1,202 @@
|
||||||
|
|
||||||
|
Apache License
|
||||||
|
Version 2.0, January 2004
|
||||||
|
http://www.apache.org/licenses/
|
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|
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|
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@ -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
|
|
@ -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.
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||||||
|
# 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()
|
|
@ -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
|
|
@ -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)
|
||||||
|
|
Loading…
Reference in New Issue