We would like to be able to set the idle states of CPUs while running
rteval.
This patch adds the file cpupower.py and option '--idle-set' within
rteval to use cpupower. The set idle state is applied to the cpulist
given by '--measurement-cpulist'.
cpupower.py provides the infrastructure to interface and execute the cpupower
command, and the options in rteval-cmd let the user specify the idle state
to be set and the CPUs to set it on.
Signed-off-by: Anubhav Shelat <ashelat@xxxxxxxxxx>
---
rteval-cmd | 22 ++++++++-
rteval/cpupower.py | 94 ++++++++++++++++++++++++++++++++++++++
rteval/modules/__init__.py | 2 +-
3 files changed, 116 insertions(+), 2 deletions(-)
create mode 100644 rteval/cpupower.py
diff --git a/rteval-cmd b/rteval-cmd
index 5cb6d7a44523..c676ad56bf85 100755
--- a/rteval-cmd
+++ b/rteval-cmd
@@ -29,6 +29,7 @@ from rteval.Log import Log
from rteval import RtEval, rtevalConfig
from rteval.modules.loads import LoadModules
from rteval.modules.measurement import MeasurementModules
+from rteval import cpupower
from rteval.version import RTEVAL_VERSION
from rteval.systopology import SysTopology, parse_cpulist_from_config
from rteval.modules.loads.kcompile import ModuleParameters
@@ -146,7 +147,8 @@ def parse_options(cfg, parser, cmdargs):
parser.add_argument("-S", "--source-download", nargs="*", dest="rteval___srcdownload",
type=str, default=None, metavar="KERNEL_VERSION",
help='download a source kernel from kernel.org and exit')
-
+ parser.add_argument('--idle-set', dest='rteval___idlestate', metavar='IDLESTATE',
+ default=None, help='Idle state to enable for this rteval run')
if not cmdargs:
cmdargs = ["--help"]
@@ -169,6 +171,12 @@ def parse_options(cfg, parser, cmdargs):
cmd_args = cmdargs[ind+1:]
cmdargs = cmdargs[:ind+1]
+ # if --cpulist is specified, make sure --idle-set is too
+ if ((sys.argv.count('-c')+sys.argv.count('--cpulist')) > 0) and \
+ (sys.argv.count('--idle-set') == 0):
+ print('--cpulist must be used with --idle-set')
+ cmdargs = ["--help"]
+
cmd_opts = parser.parse_args(args=cmdargs)
# if no kernel version was provided for --source-download, set version to default
@@ -263,6 +271,9 @@ if __name__ == '__main__':
| (rtevcfg.debugging and Log.DEBUG)
logger.SetLogVerbosity(loglev)
+ # check if cpupower is being used
+ if sys.argv.count('--idle-set') > 0:
+ rtevcfg.update({'usingCpupower': True})
# Load modules
loadmods = LoadModules(config, logger=logger)
measuremods = MeasurementModules(config, logger=logger)
@@ -394,6 +405,11 @@ if __name__ == '__main__':
if not os.path.isdir(rtevcfg.workdir):
raise RuntimeError(f"work directory {rtevcfg.workdir} does not exist")
+ # if idle-set has been specified, enable idlestate in rtecfg.cpulist
+ cpupower_controller = None
+ if rtevcfg.idlestate:
+ cpupower_controller = cpupower.Cpupower(msrcfg.cpulist, rtevcfg.idlestate)
+ cpupower_controller.enable_idle_state()
rteval = RtEval(config, loadmods, measuremods, logger)
rteval.Prepare(rtevcfg.onlyload)
@@ -413,6 +429,10 @@ if __name__ == '__main__':
ec = rteval.Measure()
logger.log(Log.DEBUG, f"exiting with exit code: {ec}")
+ # reset idlestate
+ if rtevcfg.idlestate:
+ cpupower_controller.restore_cstate()
+
sys.exit(ec)
except KeyboardInterrupt:
sys.exit(0)
diff --git a/rteval/cpupower.py b/rteval/cpupower.py
new file mode 100644
index 000000000000..9437b2451b54
--- /dev/null
+++ b/rteval/cpupower.py
@@ -0,0 +1,94 @@
+#! /user/bin/python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Object to execute cpupower tool
+# Copyright 2024 Anubhav Shelat <ashelat@xxxxxxxxxx>
+
+import subprocess
+import argparse
+import os
+import multiprocessing
+import time
+
+
+class Cpupower:
+ def __init__(self, cpulist, idlestate):
+ self.cpulist = cpulist
+ self.idlestate = idlestate
+ self.nstates = len(os.listdir('/sys/devices/system/cpu/cpu0/cpuidle/')) # number of cstates
+ self.cpu_count = multiprocessing.cpu_count()
+ self.cstate_cfg = []
+
+
+ def enable_idle_state(self):
+ ''' Enable a specific cstate, while disabling all other cstates, and save the current cstate configuration '''
+ self.cstate_cfg = self.get_cstate_cfg()
+
+ # ensure that cstate is in range of available cstates
+ if int(self.idlestate) > self.nstates-1 or int(self.idlestate) < 0:
+ print(f'Idle state {self.idlestate} is out of range, using POLL')
+ self.idlestate = 0
+
+ # enable cstate and disable the rest
+ if (self.cpulist):
+ subprocess.run(['sudo', 'cpupower', '-c', self.cpulist,'idle-set', '-e', str(self.idlestate)], stdout=open(os.devnull, 'wb'))
+ for cs in range(self.nstates):
+ if str(cs) != self.idlestate:
+ subprocess.run(['sudo', 'cpupower', '-c', self.cpulist,'idle-set', '-d', str(cs)], stdout=open(os.devnull, 'wb'))
+ else:
+ subprocess.run(['sudo', 'cpupower', 'idle-set', '-e', str(self.idlestate)], stdout=open(os.devnull, 'wb'))
+ for cs in range(self.nstates):
+ if str(cs) != self.idlestate:
+ subprocess.run(['sudo', 'cpupower', 'idle-set', '-d', str(cs)], stdout=open(os.devnull, 'wb'))
+
+ if self.cpulist: print(f'Idlestate {self.idlestate} enabled on CPUs {self.cpulist}')
+ else: print(f'Idlestate {self.idlestate} enabled on all CPUs')
+
+
+ def get_cstate_cfg(self):
+ ''' Store the current cstate config '''
+ # cstate [m] configuration on cpu [n] can be found in '/sys/devices/system/cpu/cpu*/cpuidle/state*/disable'
+ cfg = []
+ for cpu in range(self.cpu_count):
+ cfg.append([])
+ for cs in range(self.nstates):
+ f = open('/sys/devices/system/cpu/cpu'+str(cpu)+'/cpuidle/state'+str(cs)+'/disable', 'r')
+ d = f.read(1)
+ cfg[cpu].append(d) # cstate_cfg[n][m] stores the m-th idle state on the n-th cpu
+
+ return cfg
+
+
+ def restore_cstate(self):
+ for cpu in range(self.cpu_count):
+ for cs in range(self.nstates):
+ f = open('/sys/devices/system/cpu/cpu'+str(cpu)+'/cpuidle/state'+str(cs)+'/disable', 'w')
+ f.write(self.cstate_cfg[cpu][cs])
+ f.close()
+ print('Idle state configuration restored')
+
+ def get_idle_info():
+ subprocess.call(['cpupower', 'idle-info'])
+
+
+if __name__ == '__main__':
+ parser = argparse.ArgumentParser()
+ parser.add_argument('-c', '--cpu-list', required=False, default=None,
+ help='List of cpus to perform cpupower-idle-set operation on.')
+ parser.add_argument('-s', '--idle-set', default='',
+ help='Specify idle state to enable/disable')
+ parser.add_argument('--info', default=False, action='store_true', help='Get idle state information')
+
+ args = parser.parse_args()
+ print(args)
+ cpulist = args.cpu_list
+ idlestate = args.cstate
+ if (idlestate):
+ cpupower = Cpupower(cpulist, idlestate)
+ cpupower.enable_idle_state()
+ time.sleep(10)
+ cpupower.restore_cstate()
+ elif (args.info):
+ Cpupower.get_idle_info()
+
+
diff --git a/rteval/modules/__init__.py b/rteval/modules/__init__.py
index 4330a839db6f..9d42d0e949fc 100644
--- a/rteval/modules/__init__.py
+++ b/rteval/modules/__init__.py
@@ -284,7 +284,7 @@ the information provided by the module"""
grparser.add_argument(f'--{self.__modtype}-cpulist',
dest=f'{self.__modtype}___cpulist', action='store', default="",
help=f'CPU list where {self.__modtype} modules will run',
- metavar='LIST')
+ metavar='CPULIST')
for (modname, mod) in list(self.__modsloaded.items()):
opts = mod.ModuleParameters()
--
2.45.2
