We would like to be able to set the cstate of CPUs while running tuna.
This patch adds the file cpupower.py and options to tuna-cmd.py.
This allows the user to execute the cpupower command from tuna,
allowing the user to set the cstate on a given list or cpus.
Once tuna exits, the original cstate configuration will be restored.
This will let the user to test balancing power consumption and
performance.
Signed-off-by: Anubhav Shelat <ashelat@xxxxxxxxxx>
---
tuna-cmd.py | 17 +++++++++--
tuna/cpupower.py | 79 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 93 insertions(+), 3 deletions(-)
create mode 100644 tuna/cpupower.py
diff --git a/tuna-cmd.py b/tuna-cmd.py
index f37e286bffdb..683cf848b9a4 100755
--- a/tuna-cmd.py
+++ b/tuna-cmd.py
@@ -21,7 +21,7 @@ from functools import reduce
import tuna.new_eth as ethtool
import tuna.tuna_sched as tuna_sched
import procfs
-from tuna import tuna, sysfs
+from tuna import tuna, sysfs, cpupower
import logging
import time
import shutil
@@ -116,7 +116,10 @@ def gen_parser():
"disable_perf": dict(action='store_true', help="Explicitly disable usage of perf in GUI for process view"),
"refresh": dict(default=2500, metavar='MSEC', type=int, help="Refresh the GUI every MSEC milliseconds"),
"priority": dict(default=(None, None), metavar="POLICY:RTPRIO", type=tuna.get_policy_and_rtprio, help="Set thread scheduler tunables: POLICY and RTPRIO"),
- "background": dict(action='store_true', help="Run command as background task")
+ "background": dict(action='store_true', help="Run command as background task"),
+ "cstate": dict(dest='cstate', metavar='CSTATE', help='Set cpus in IDLE-LIST to a specific cstate'),
+ "idle_list": dict(dest="idle_list", metavar='IDLE-LIST',
+ help='CPU list to set idle states on (default: all cpus).')
}
parser = HelpMessageParser(description="tuna - Application Tuning Program")
@@ -125,6 +128,8 @@ def gen_parser():
parser.add_argument('-v', '--version', **MODS['version'])
parser.add_argument('-L', '--logging', **MODS['logging'])
parser.add_argument('-D', '--debug', **MODS['debug'])
+ parser.add_argument('-i', '--cstate', **MODS['cstate'])
+ parser.add_argument('-l', '--idle-list', **MODS['idle_list'])
subparser = parser.add_subparsers(dest='command')
@@ -649,7 +654,6 @@ def main():
parser = gen_parser()
# Set all necessary defaults for gui subparser if no arguments provided
args = parser.parse_args() if len(sys.argv) > 1 else parser.parse_args(['gui'])
-
if args.debug:
my_logger = setup_logging("my_logger")
my_logger.addHandler(add_handler("DEBUG", tofile=False))
@@ -667,6 +671,10 @@ def main():
print("Valid log levels: NOTSET, DEBUG, INFO, WARNING, ERROR")
print("Log levels may be specified numerically (0-4)\n")
+ if args.cstate:
+ cpupower_controller = cpupower.Cpupower(args.idle_list, args.cstate)
+ cpupower_controller.enable_idle_state()
+
if 'irq_list' in vars(args):
ps = procfs.pidstats()
if tuna.has_threaded_irqs(ps):
@@ -760,6 +768,9 @@ def main():
except KeyboardInterrupt:
pass
+ if cpupower_controller:
+ cpupower_controller.restore_cstate()
+
if __name__ == '__main__':
main()
diff --git a/tuna/cpupower.py b/tuna/cpupower.py
new file mode 100644
index 000000000000..abbbe0448a8a
--- /dev/null
+++ b/tuna/cpupower.py
@@ -0,0 +1,79 @@
+#! /user/bin/python3
+
+import subprocess
+import argparse
+import os
+import multiprocessing
+import time
+
+
+class Cpupower:
+ def __init__(self, cpulist, cstate):
+ self.cpulist = cpulist
+ self.cstate = cstate
+ 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()
+
+ # enable cstate and disable the rest
+ if (self.cpulist):
+ subprocess.run(['sudo', 'cpupower', '-c', self.cpulist,'idle-set', '-e', str(self.cstate)], stdout=open(os.devnull, 'wb'))
+ for cs in range(self.nstates):
+ if str(cs) != self.cstate:
+ 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.cstate)], stdout=open(os.devnull, 'wb'))
+ for cs in range(self.nstates):
+ if str(cs) != self.cstate:
+ subprocess.run(['sudo', 'cpupower', 'idle-set', '-d', str(cs)], stdout=open(os.devnull, 'wb'))
+
+ if self.cpulist: print(f'Idlestate {self.cstate} enabled on CPUs {self.cpulist}')
+ else: print(f'Idlestate {self.cstate} 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')
+
+
+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', '--cstate', default='',
+ help='Specify cstate to enable/disable')
+
+ args = parser.parse_args()
+ print(args)
+ cpulist = args.cpu_list
+ cstate = args.cstate
+ cpupower = Cpupower(cpulist, cstate)
+
+ cpupower.enable_idle_state()
+ time.sleep(10)
+ cpupower.restore_cstate()
+
+
--
2.45.2
