[PATCH v5 0/2] Add cpupower idle-state functionality

[PATCH v5 0/2] Add cpupower idle-state functionality

[John B. Wyatt IV]

This patch series adds idle-state functionality to control cpu power
usage and to test idle states.

The number of cpus was needed in the cpupower file; I extracted out the
previously local to tuna-cli.py functionality to a separate file so the
cpu code can be used in any file in Tuna and reduce duplications. The
nics code was similar so it was also extracted to reduce the number of
global variables.

Sincerely,
John Wyatt
Software Engineer, Core Kernel
Red Hat

Changes v4 -> v5:
- Additional changes by John Kacur suggested off list to make the code
  more Pythonic, changing idle_set to cpu_power, and resolve some
  miscellaneous issues.
- Changed error messages to use stderr as requested by Crystal Wood and
  other suggestions.
- Removed Suggested-by for Crystal as she said it was unwarranted.

Changes v3 -> v4:
- Additional changes suggest by John Kacur around the use of
  @classmethods that they should've been @staticmethods and the changes
  needed for them.
- Changed the SPDX lines to be at the top of the files as requested by
  John Kacur.

Changes v2 -> v3:
- Several small improvements suggested by John Kacur off list including
  removing unnecessary string interpolation, renaming idle-set to idle_set,
  and correct placement of docstrings.

Changes v1 -> v2:
- Numerous improvements suggested by Crystal Wood including message
  text, output, error handling, moving a function to utils.py and
  structure of the code.
- Fixed a libcpupower bindings detection error that did not show on
  my local machine but did on a fresh install of Fedora GNOME 40
  reported by John Kacur.

John B. Wyatt IV (2):
  tuna: extract common cpu and nics determination code into a utils.py
    file
  tuna: Add idle_state control functionality

 tuna-cmd.py      |  64 +++++++++--------
 tuna/cpupower.py | 177 +++++++++++++++++++++++++++++++++++++++++++++++
 tuna/utils.py    |  28 ++++++++
 3 files changed, 239 insertions(+), 30 deletions(-)
 create mode 100755 tuna/cpupower.py
 create mode 100644 tuna/utils.py

-- 
2.49.0

[PATCH v5 1/2] tuna: extract common cpu and nics determination code into a utils.py file

[John B. Wyatt IV]

Extracting the code allows these previously local (global to the file)
variables and functions to be used in other files of tuna. Reducing
the number of globals makes the code cleaner and reduces the size of
tuna-cmd.py.

Included a suggestion by Crystal to move a function from the latter
patch into utils.py and make it dependant on get_nr_cpus() (v2).

Included a request by John Kacur to place the SPDX message at the top of
the file (v4).

Suggested-by: Crystal Wood <crwood@redhat.com>

Signed-off-by: John B. Wyatt IV <jwyatt@redhat.com>
Signed-off-by: John B. Wyatt IV <sageofredondo@gmail.com>
---
 tuna-cmd.py   | 34 +++++++---------------------------
 tuna/utils.py | 28 ++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 27 deletions(-)
 create mode 100644 tuna/utils.py

diff --git a/tuna-cmd.py b/tuna-cmd.py
index f37e286..d0323f5 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, utils
 import logging
 import time
 import shutil
@@ -76,7 +76,6 @@ except:
 
 # FIXME: ETOOMANYGLOBALS, we need a class!
 
-nr_cpus = None
 ps = None
 irqs = None
 
@@ -233,25 +232,6 @@ def gen_parser():
     return parser
 
 
-def get_nr_cpus():
-    """ Get all cpus including disabled cpus """
-    global nr_cpus
-    if nr_cpus:
-        return nr_cpus
-    nr_cpus = os.sysconf('SC_NPROCESSORS_CONF')
-    return nr_cpus
-
-nics = None
-
-
-def get_nics():
-    global nics
-    if nics:
-        return nics
-    nics = ethtool.get_active_devices()
-    return nics
-
-
 def thread_help(tid):
     global ps
     if not ps:
@@ -277,7 +257,7 @@ def save(cpu_list, thread_list, filename):
         if (cpu_list and not set(kt.affinity).intersection(set(cpu_list))) or \
            (thread_list and kt.pid not in thread_list):
             del kthreads[name]
-    tuna.generate_rtgroups(filename, kthreads, get_nr_cpus())
+    tuna.generate_rtgroups(filename, kthreads, utils.get_nr_cpus())
 
 
 def ps_show_header(has_ctxt_switch_info, cgroups=False):
@@ -328,7 +308,7 @@ def format_affinity(affinity):
     if len(affinity) <= 4:
         return ",".join(str(a) for a in affinity)
 
-    return ",".join(str(hex(a)) for a in procfs.hexbitmask(affinity, get_nr_cpus()))
+    return ",".join(str(hex(a)) for a in procfs.hexbitmask(affinity, utils.get_nr_cpus()))
 
 def ps_show_thread(pid, affect_children, ps, has_ctxt_switch_info, sock_inodes,
                    sock_inode_re, cgroups, columns=None, compact=True):
@@ -351,7 +331,7 @@ def ps_show_thread(pid, affect_children, ps, has_ctxt_switch_info, sock_inodes,
                 irqs = procfs.interrupts()
             users = irqs[tuna.irq_thread_number(cmd)]["users"]
             for u in users:
-                if u in get_nics():
+                if u in utils.get_nics():
                     users[users.index(u)] = "%s(%s)" % (
                         u, ethtool.get_module(u))
             users = ",".join(users)
@@ -486,7 +466,7 @@ def do_ps(thread_list, cpu_list, irq_list, show_uthreads, show_kthreads,
 
 
 def find_drivers_by_users(users):
-    nics = get_nics()
+    nics = utils.get_nics()
     drivers = []
     for u in users:
         try:
@@ -689,10 +669,10 @@ def main():
         apply_config(args.profilename)
 
     elif args.command in ['include', 'I']:
-        tuna.include_cpus(args.cpu_list, get_nr_cpus())
+        tuna.include_cpus(args.cpu_list, utils.get_nr_cpus())
 
     elif args.command in ['isolate', 'i']:
-        tuna.isolate_cpus(args.cpu_list, get_nr_cpus())
+        tuna.isolate_cpus(args.cpu_list, utils.get_nr_cpus())
 
     elif args.command in ['run', 'r']:
 
diff --git a/tuna/utils.py b/tuna/utils.py
new file mode 100644
index 0000000..f55432d
--- /dev/null
+++ b/tuna/utils.py
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (C) 2024 John B. Wyatt IV
+
+import os
+
+import tuna.new_eth as ethtool
+
+# Collect a few globals and functions so they can be reused in other modules
+nr_cpus = None
+nics = None
+
+def get_nr_cpus():
+    """ Get all cpus including disabled cpus """
+    global nr_cpus
+    if nr_cpus != None:
+        return nr_cpus
+    nr_cpus = os.sysconf('SC_NPROCESSORS_CONF')
+    return nr_cpus
+
+def get_all_cpu_list():
+    return list(range(get_nr_cpus()))
+
+def get_nics():
+    global nics
+    if nics != None:
+        return nics
+    nics = ethtool.get_active_devices()
+    return nics
-- 
2.49.0

[PATCH v5 2/2] tuna: Add idle_state control functionality

[John B. Wyatt IV]

Allows Tuna to control cpu idle-state functionality on the system,
including querying, enabling, disabling of cpu idle-states to control
power usage or to test functionality.

This requires cpupower, a utility in the Linux kernel repository and
the cpupower Python bindings added in Linux 6.12 to control cpu
idle-states.

This patch revision includes text snippet & Python suggestions by Crystal
Wood (v2-4) and small Python suggestions & code snippets by John Kacur
(v3-5).

Suggested-by: John Kacur <jkacur@redhat.com>

Signed-off-by: John B. Wyatt IV <jwyatt@redhat.com>
Signed-off-by: John B. Wyatt IV <sageofredondo@gmail.com>
---
 tuna-cmd.py      |  30 +++++++-
 tuna/cpupower.py | 177 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 204 insertions(+), 3 deletions(-)
 create mode 100755 tuna/cpupower.py

diff --git a/tuna-cmd.py b/tuna-cmd.py
index d0323f5..4997eaa 100755
--- a/tuna-cmd.py
+++ b/tuna-cmd.py
@@ -25,6 +25,7 @@ from tuna import tuna, sysfs, utils
 import logging
 import time
 import shutil
+import tuna.cpupower as cpw
 
 def get_loglevel(level):
     if level.isdigit() and int(level) in range(0,5):
@@ -115,8 +116,12 @@ 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"),
+            "idle_info": dict(dest='idle_info', action='store_const', const=True, help='Print general idle information for the selected CPUs, including index values for IDLE-STATE.'),
+            "idle_state_disabled_status": dict(dest='idle_state_disabled_status', metavar='IDLE-STATE', type=int, help='Print whether IDLE-STATE is enabled on the selected CPUs.'),
+            "disable_idle_state": dict(dest='disable_idle_state', metavar='IDLE-STATE', type=int, help='Disable IDLE-STATE on the selected CPUs.'),
+            "enable_idle_state": dict(dest='enable_idle_state', metavar='IDLE-STATE', type=int, help='Enable IDLE-STATE on the selected CPUs.')
+    }
 
     parser = HelpMessageParser(description="tuna - Application Tuning Program")
 
@@ -127,6 +132,9 @@ def gen_parser():
 
     subparser = parser.add_subparsers(dest='command')
 
+    idle_set = subparser.add_parser('cpu_power',
+                                    description='Manage CPU idle state disabling (requires libcpupower and it\'s Python bindings)',
+                                    help='Set all idle states on a given CPU-LIST.')
     isolate = subparser.add_parser('isolate', description="Move all allowed threads and IRQs away from CPU-LIST",
                                     help="Move all allowed threads and IRQs away from CPU-LIST")
     include = subparser.add_parser('include', description="Allow all threads to run on CPU-LIST",
@@ -146,7 +154,6 @@ def gen_parser():
     show_threads = subparser.add_parser('show_threads', description='Show thread list', help='Show thread list')
     show_irqs = subparser.add_parser('show_irqs', description='Show IRQ list', help='Show IRQ list')
     show_configs = subparser.add_parser('show_configs', description='List preloaded profiles', help='List preloaded profiles')
-
     what_is = subparser.add_parser('what_is', description='Provides help about selected entities', help='Provides help about selected entities')
     gui = subparser.add_parser('gui', description="Start the GUI", help="Start the GUI")
 
@@ -218,6 +225,13 @@ def gen_parser():
     show_irqs_group.add_argument('-S', '--sockets', **MODS['sockets'])
     show_irqs.add_argument('-q', '--irqs', **MODS['irqs'])
 
+    idle_set_group = idle_set.add_mutually_exclusive_group(required=True)
+    idle_set_group.add_argument('-i', '--idle-info', **MODS['idle_info'])
+    idle_set_group.add_argument('-s', '--status', **MODS['idle_state_disabled_status'])
+    idle_set_group.add_argument('-d', '--disable', **MODS['disable_idle_state'])
+    idle_set_group.add_argument('-e', '--enable', **MODS['enable_idle_state'])
+    idle_set.add_argument('-c', '--cpus', **MODS['cpus'])
+
     what_is.add_argument('thread_list', **POS['thread_list'])
 
     gui.add_argument('-d', '--disable_perf', **MODS['disable_perf'])
@@ -647,6 +661,16 @@ def main():
             print("Valid log levels: NOTSET, DEBUG, INFO, WARNING, ERROR")
             print("Log levels may be specified numerically (0-4)\n")
 
+    if args.command == 'cpu_power':
+        if not cpw.have_cpupower:
+            print(f"Error: libcpupower bindings are not detected; please install libcpupower bindings from at least kernel {cpw.cpupower_required_kernel}.", file=sys.stderr)
+            sys.exit(1)
+
+        my_cpupower = cpw.Cpupower(args.cpu_list)
+        ret = my_cpupower.idle_set_handler(args)
+        if ret > 0:
+            sys.exit(ret)
+
     if 'irq_list' in vars(args):
         ps = procfs.pidstats()
         if tuna.has_threaded_irqs(ps):
diff --git a/tuna/cpupower.py b/tuna/cpupower.py
new file mode 100755
index 0000000..9a80f8e
--- /dev/null
+++ b/tuna/cpupower.py
@@ -0,0 +1,177 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (C) 2025 John B. Wyatt IV
+
+import sys
+from typing import List
+from tuna import utils
+
+cpupower_required_kernel = "6.12"
+have_cpupower = None
+
+try:
+    import raw_pylibcpupower as lcpw
+    lcpw.cpufreq_get_available_frequencies(0)
+    have_cpupower = True
+except ImportError:
+    lcpw = None
+    have_cpupower = False
+
+if have_cpupower:
+    class Cpupower:
+        """The Cpupower class allows you to query and change the power states of the
+        cpu.
+
+        You may query or change the cpus all at once or a list of the cpus provided to the constructor's cpulist argument.
+
+        The bindings must be detected on the $PYTHONPATH variable.
+
+        You must use have_cpupower variable to determine if the bindings were
+        detected in your code."""
+
+        LCPW_ERROR_TWO_CASE = 1 # enum for common error messages
+        LCPW_ERROR_THREE_CASE = 2
+
+        def __init__(self, cpu_list=None):
+            if cpu_list and not cpu_list == []:
+                self.__cpu_list = cpu_list
+            else:
+                self.__cpu_list = utils.get_all_cpu_list()
+
+        def handle_common_lcpw_errors(self, e, error_type, idle_name):
+            match e:
+                case 0:
+                    pass
+                case -1:
+                    print(f"Idlestate {idle_name} not available", file=sys.stderr)
+                case -2:
+                    print("Disabling is not supported by the kernel", file=sys.stderr)
+                case -3:
+                    if error_type == Cpupower.LCPW_ERROR_THREE_CASE:
+                        print("No write access to disable/enable C-states: try using sudo", file=sys.stderr)
+                    else:
+                        print(f"Not documented: {e}", file=sys.stderr)
+                case _:
+                    print(f"Not documented: {e}", file=sys.stderr)
+
+        def get_idle_states(self, cpu):
+            """
+            Get the c-states of a cpu.
+
+            You can capture the return values with:
+            states_list, states_amt = get_idle_states()
+
+            Returns
+                List[String]: list of cstates
+                Int: amt of cstates
+            """
+            ret = []
+            for cstate in range(lcpw.cpuidle_state_count(cpu)):
+                ret.append(lcpw.cpuidle_state_name(cpu,cstate))
+            return ret, lcpw.cpuidle_state_count(cpu)
+
+        def get_idle_info(self, cpu):
+            idle_states, idle_states_amt = self.get_idle_states(cpu)
+            idle_states_list = []
+            for idle_state, idle_state_name in enumerate(idle_states):
+                idle_states_list.append(
+                    {
+                        "CPU ID": cpu,
+                        "Idle State Name": idle_state_name,
+                        "Flags/Description": lcpw.cpuidle_state_desc(cpu, idle_state),
+                        "Latency": lcpw.cpuidle_state_latency(cpu, idle_state),
+                        "Usage": lcpw.cpuidle_state_usage(cpu, idle_state),
+                        "Duration": lcpw.cpuidle_state_time(cpu, idle_state)
+                    }
+                )
+            idle_info = {
+                "CPUidle-driver": lcpw.cpuidle_get_driver(),
+                "CPUidle-governor": lcpw.cpuidle_get_governor(),
+                "idle-states-count": idle_states_amt,
+                "available-idle-states": idle_states,
+                "cpu-states": idle_states_list
+            }
+            return idle_info
+
+        def print_idle_info(self, cpu_list):
+            for cpu in cpu_list:
+                idle_info = self.get_idle_info(cpu)
+                print(
+f"""CPUidle driver: {idle_info["CPUidle-driver"]}
+CPUidle governor: {idle_info["CPUidle-governor"]}
+analyzing CPU {cpu}
+
+Number of idle states: {idle_info["idle-states-count"]}
+Available idle states: {idle_info["available-idle-states"]}""")
+                for state in idle_info["cpu-states"]:
+                    print(
+f"""{state["Idle State Name"]}
+Flags/Description: {state["Flags/Description"]}
+Latency: {state["Latency"]}
+Usage: {state["Usage"]}
+Duration: {state["Duration"]}""")
+
+        def idle_set_handler(self, args) -> int:
+            if args.idle_state_disabled_status is not None:
+                cstate_index = args.idle_state_disabled_status
+                cstate_list, cstate_amt = self.get_idle_states(self.__cpu_list[0]) # Assuming all cpus have the same idle state
+                if cstate_index < 0 or cstate_index >= cstate_amt:
+                    print(f"Invalid idle state range. Total for this cpu is {cstate_amt}", file=sys.stderr)
+                    return 1
+                cstate_name = cstate_list[cstate_index]
+                ret = self.is_disabled_idle_state(cstate_index)
+                for i,e in enumerate(ret):
+                    if e == 1:
+                        print(f"CPU: {self.__cpu_list[i]} Idle state \"{cstate_name}\" is disabled.")
+                    elif e == 0:
+                        print(f"CPU: {self.__cpu_list[i]} Idle state \"{cstate_name}\" is enabled.")
+                    else:
+                        self.handle_common_lcpw_errors(e, self.LCPW_ERROR_TWO_CASE, cstate_name)
+            elif args.idle_info is not None:
+                self.print_idle_info(self.__cpu_list)
+                return 0
+            elif args.disable_idle_state is not None:
+                cstate_index = args.disable_idle_state
+                cstate_list, cstate_amt = self.get_idle_states(self.__cpu_list[0]) # Assuming all cpus have the same idle state
+                if cstate_index < 0 or cstate_index >= cstate_amt:
+                    print(f"Invalid idle state range. Total for this cpu is {cstate_amt}")
+                    return 1
+                cstate_name = cstate_list[cstate_index]
+                ret = self.disable_idle_state(cstate_index, 1)
+                for e in ret:
+                    self.handle_common_lcpw_errors(e, self.LCPW_ERROR_THREE_CASE, cstate_name)
+            elif args.enable_idle_state is not None:
+                cstate_index = args.enable_idle_state
+                cstate_list, cstate_amt = self.get_idle_states(self.__cpu_list[0]) # Assuming all cpus have the same idle state
+                if cstate_index < 0 or cstate_index >= cstate_amt:
+                    print(f"Invalid idle state range. Total for this cpu is {cstate_amt}")
+                    return 1
+                cstate_name = cstate_list[cstate_index]
+                ret = self.disable_idle_state(cstate_index, 0)
+                for e in ret:
+                    self.handle_common_lcpw_errors(e, self.LCPW_ERROR_THREE_CASE, cstate_name)
+            return 0
+
+        def disable_idle_state(self, state, disabled) -> List[int]:
+            """
+            Disable or enable an idle state using the object's stored list of cpus.
+
+            Args:
+                state (int): The cpu idle state index to disable or enable as an int starting from 0.
+                disabled (int): set to 1 to disable or 0 to enable. Less than 0 is an error.
+            """
+            ret = []
+            for cpu in self.__cpu_list:
+                ret.append(lcpw.cpuidle_state_disable(cpu, state, disabled))
+            return ret
+
+        def is_disabled_idle_state(self, state) -> List[int]:
+            """
+            Query the idle state.
+
+            Args:
+                state: The cpu idle state. 1 is disabled, 0 is enabled. Less than 0 is an error.
+            """
+            ret = []
+            for cpu in self.__cpu_list:
+                ret.append(lcpw.cpuidle_is_state_disabled(cpu, state))
+            return ret
-- 
2.49.0

Re: [PATCH v5 2/2] tuna: Add idle_state control functionality

[John Kacur]

On Wed, 9 Apr 2025, John B. Wyatt IV wrote:

> Allows Tuna to control cpu idle-state functionality on the system,
> including querying, enabling, disabling of cpu idle-states to control
> power usage or to test functionality.
> 
> This requires cpupower, a utility in the Linux kernel repository and
> the cpupower Python bindings added in Linux 6.12 to control cpu
> idle-states.
> 
> This patch revision includes text snippet & Python suggestions by Crystal
> Wood (v2-4) and small Python suggestions & code snippets by John Kacur
> (v3-5).
> 
> Suggested-by: John Kacur <jkacur@redhat.com>
> 
> Signed-off-by: John B. Wyatt IV <jwyatt@redhat.com>
> Signed-off-by: John B. Wyatt IV <sageofredondo@gmail.com>
Signed-off-by: John Kacur <jkacur@redhat.com>
> ---
>  tuna-cmd.py      |  30 +++++++-
>  tuna/cpupower.py | 177 +++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 204 insertions(+), 3 deletions(-)
>  create mode 100755 tuna/cpupower.py
> 
> diff --git a/tuna-cmd.py b/tuna-cmd.py
> index d0323f5..4997eaa 100755
> --- a/tuna-cmd.py
> +++ b/tuna-cmd.py
> @@ -25,6 +25,7 @@ from tuna import tuna, sysfs, utils
>  import logging
>  import time
>  import shutil
> +import tuna.cpupower as cpw
>  
>  def get_loglevel(level):
>      if level.isdigit() and int(level) in range(0,5):
> @@ -115,8 +116,12 @@ 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"),
> +            "idle_info": dict(dest='idle_info', action='store_const', const=True, help='Print general idle information for the selected CPUs, including index values for IDLE-STATE.'),
> +            "idle_state_disabled_status": dict(dest='idle_state_disabled_status', metavar='IDLE-STATE', type=int, help='Print whether IDLE-STATE is enabled on the selected CPUs.'),
> +            "disable_idle_state": dict(dest='disable_idle_state', metavar='IDLE-STATE', type=int, help='Disable IDLE-STATE on the selected CPUs.'),
> +            "enable_idle_state": dict(dest='enable_idle_state', metavar='IDLE-STATE', type=int, help='Enable IDLE-STATE on the selected CPUs.')
> +    }
>  
>      parser = HelpMessageParser(description="tuna - Application Tuning Program")
>  
> @@ -127,6 +132,9 @@ def gen_parser():
>  
>      subparser = parser.add_subparsers(dest='command')
>  
> +    idle_set = subparser.add_parser('cpu_power',
> +                                    description='Manage CPU idle state disabling (requires libcpupower and it\'s Python bindings)',
> +                                    help='Set all idle states on a given CPU-LIST.')
>      isolate = subparser.add_parser('isolate', description="Move all allowed threads and IRQs away from CPU-LIST",
>                                      help="Move all allowed threads and IRQs away from CPU-LIST")
>      include = subparser.add_parser('include', description="Allow all threads to run on CPU-LIST",
> @@ -146,7 +154,6 @@ def gen_parser():
>      show_threads = subparser.add_parser('show_threads', description='Show thread list', help='Show thread list')
>      show_irqs = subparser.add_parser('show_irqs', description='Show IRQ list', help='Show IRQ list')
>      show_configs = subparser.add_parser('show_configs', description='List preloaded profiles', help='List preloaded profiles')
> -
>      what_is = subparser.add_parser('what_is', description='Provides help about selected entities', help='Provides help about selected entities')
>      gui = subparser.add_parser('gui', description="Start the GUI", help="Start the GUI")
>  
> @@ -218,6 +225,13 @@ def gen_parser():
>      show_irqs_group.add_argument('-S', '--sockets', **MODS['sockets'])
>      show_irqs.add_argument('-q', '--irqs', **MODS['irqs'])
>  
> +    idle_set_group = idle_set.add_mutually_exclusive_group(required=True)
> +    idle_set_group.add_argument('-i', '--idle-info', **MODS['idle_info'])
> +    idle_set_group.add_argument('-s', '--status', **MODS['idle_state_disabled_status'])
> +    idle_set_group.add_argument('-d', '--disable', **MODS['disable_idle_state'])
> +    idle_set_group.add_argument('-e', '--enable', **MODS['enable_idle_state'])
> +    idle_set.add_argument('-c', '--cpus', **MODS['cpus'])
> +
>      what_is.add_argument('thread_list', **POS['thread_list'])
>  
>      gui.add_argument('-d', '--disable_perf', **MODS['disable_perf'])
> @@ -647,6 +661,16 @@ def main():
>              print("Valid log levels: NOTSET, DEBUG, INFO, WARNING, ERROR")
>              print("Log levels may be specified numerically (0-4)\n")
>  
> +    if args.command == 'cpu_power':
> +        if not cpw.have_cpupower:
> +            print(f"Error: libcpupower bindings are not detected; please install libcpupower bindings from at least kernel {cpw.cpupower_required_kernel}.", file=sys.stderr)
> +            sys.exit(1)
> +
> +        my_cpupower = cpw.Cpupower(args.cpu_list)
> +        ret = my_cpupower.idle_set_handler(args)
> +        if ret > 0:
> +            sys.exit(ret)
> +
>      if 'irq_list' in vars(args):
>          ps = procfs.pidstats()
>          if tuna.has_threaded_irqs(ps):
> diff --git a/tuna/cpupower.py b/tuna/cpupower.py
> new file mode 100755
> index 0000000..9a80f8e
> --- /dev/null
> +++ b/tuna/cpupower.py
> @@ -0,0 +1,177 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +# Copyright (C) 2025 John B. Wyatt IV
> +
> +import sys
> +from typing import List
> +from tuna import utils
> +
> +cpupower_required_kernel = "6.12"
> +have_cpupower = None
> +
> +try:
> +    import raw_pylibcpupower as lcpw
> +    lcpw.cpufreq_get_available_frequencies(0)
> +    have_cpupower = True
> +except ImportError:
> +    lcpw = None
> +    have_cpupower = False
> +
> +if have_cpupower:
> +    class Cpupower:
> +        """The Cpupower class allows you to query and change the power states of the
> +        cpu.
> +
> +        You may query or change the cpus all at once or a list of the cpus provided to the constructor's cpulist argument.
> +
> +        The bindings must be detected on the $PYTHONPATH variable.
> +
> +        You must use have_cpupower variable to determine if the bindings were
> +        detected in your code."""
> +
> +        LCPW_ERROR_TWO_CASE = 1 # enum for common error messages
> +        LCPW_ERROR_THREE_CASE = 2
> +
> +        def __init__(self, cpu_list=None):
> +            if cpu_list and not cpu_list == []:
> +                self.__cpu_list = cpu_list
> +            else:
> +                self.__cpu_list = utils.get_all_cpu_list()
> +
> +        def handle_common_lcpw_errors(self, e, error_type, idle_name):
> +            match e:
> +                case 0:
> +                    pass
> +                case -1:
> +                    print(f"Idlestate {idle_name} not available", file=sys.stderr)
> +                case -2:
> +                    print("Disabling is not supported by the kernel", file=sys.stderr)
> +                case -3:
> +                    if error_type == Cpupower.LCPW_ERROR_THREE_CASE:
> +                        print("No write access to disable/enable C-states: try using sudo", file=sys.stderr)
> +                    else:
> +                        print(f"Not documented: {e}", file=sys.stderr)
> +                case _:
> +                    print(f"Not documented: {e}", file=sys.stderr)
> +
> +        def get_idle_states(self, cpu):
> +            """
> +            Get the c-states of a cpu.
> +
> +            You can capture the return values with:
> +            states_list, states_amt = get_idle_states()
> +
> +            Returns
> +                List[String]: list of cstates
> +                Int: amt of cstates
> +            """
> +            ret = []
> +            for cstate in range(lcpw.cpuidle_state_count(cpu)):
> +                ret.append(lcpw.cpuidle_state_name(cpu,cstate))
> +            return ret, lcpw.cpuidle_state_count(cpu)
> +
> +        def get_idle_info(self, cpu):
> +            idle_states, idle_states_amt = self.get_idle_states(cpu)
> +            idle_states_list = []
> +            for idle_state, idle_state_name in enumerate(idle_states):
> +                idle_states_list.append(
> +                    {
> +                        "CPU ID": cpu,
> +                        "Idle State Name": idle_state_name,
> +                        "Flags/Description": lcpw.cpuidle_state_desc(cpu, idle_state),
> +                        "Latency": lcpw.cpuidle_state_latency(cpu, idle_state),
> +                        "Usage": lcpw.cpuidle_state_usage(cpu, idle_state),
> +                        "Duration": lcpw.cpuidle_state_time(cpu, idle_state)
> +                    }
> +                )
> +            idle_info = {
> +                "CPUidle-driver": lcpw.cpuidle_get_driver(),
> +                "CPUidle-governor": lcpw.cpuidle_get_governor(),
> +                "idle-states-count": idle_states_amt,
> +                "available-idle-states": idle_states,
> +                "cpu-states": idle_states_list
> +            }
> +            return idle_info
> +
> +        def print_idle_info(self, cpu_list):
> +            for cpu in cpu_list:
> +                idle_info = self.get_idle_info(cpu)
> +                print(
> +f"""CPUidle driver: {idle_info["CPUidle-driver"]}
> +CPUidle governor: {idle_info["CPUidle-governor"]}
> +analyzing CPU {cpu}
> +
> +Number of idle states: {idle_info["idle-states-count"]}
> +Available idle states: {idle_info["available-idle-states"]}""")
> +                for state in idle_info["cpu-states"]:
> +                    print(
> +f"""{state["Idle State Name"]}
> +Flags/Description: {state["Flags/Description"]}
> +Latency: {state["Latency"]}
> +Usage: {state["Usage"]}
> +Duration: {state["Duration"]}""")
> +
> +        def idle_set_handler(self, args) -> int:
> +            if args.idle_state_disabled_status is not None:
> +                cstate_index = args.idle_state_disabled_status
> +                cstate_list, cstate_amt = self.get_idle_states(self.__cpu_list[0]) # Assuming all cpus have the same idle state
> +                if cstate_index < 0 or cstate_index >= cstate_amt:
> +                    print(f"Invalid idle state range. Total for this cpu is {cstate_amt}", file=sys.stderr)
> +                    return 1
> +                cstate_name = cstate_list[cstate_index]
> +                ret = self.is_disabled_idle_state(cstate_index)
> +                for i,e in enumerate(ret):
> +                    if e == 1:
> +                        print(f"CPU: {self.__cpu_list[i]} Idle state \"{cstate_name}\" is disabled.")
> +                    elif e == 0:
> +                        print(f"CPU: {self.__cpu_list[i]} Idle state \"{cstate_name}\" is enabled.")
> +                    else:
> +                        self.handle_common_lcpw_errors(e, self.LCPW_ERROR_TWO_CASE, cstate_name)
> +            elif args.idle_info is not None:
> +                self.print_idle_info(self.__cpu_list)
> +                return 0
> +            elif args.disable_idle_state is not None:
> +                cstate_index = args.disable_idle_state
> +                cstate_list, cstate_amt = self.get_idle_states(self.__cpu_list[0]) # Assuming all cpus have the same idle state
> +                if cstate_index < 0 or cstate_index >= cstate_amt:
> +                    print(f"Invalid idle state range. Total for this cpu is {cstate_amt}")
> +                    return 1
> +                cstate_name = cstate_list[cstate_index]
> +                ret = self.disable_idle_state(cstate_index, 1)
> +                for e in ret:
> +                    self.handle_common_lcpw_errors(e, self.LCPW_ERROR_THREE_CASE, cstate_name)
> +            elif args.enable_idle_state is not None:
> +                cstate_index = args.enable_idle_state
> +                cstate_list, cstate_amt = self.get_idle_states(self.__cpu_list[0]) # Assuming all cpus have the same idle state
> +                if cstate_index < 0 or cstate_index >= cstate_amt:
> +                    print(f"Invalid idle state range. Total for this cpu is {cstate_amt}")
> +                    return 1
> +                cstate_name = cstate_list[cstate_index]
> +                ret = self.disable_idle_state(cstate_index, 0)
> +                for e in ret:
> +                    self.handle_common_lcpw_errors(e, self.LCPW_ERROR_THREE_CASE, cstate_name)
> +            return 0
> +
> +        def disable_idle_state(self, state, disabled) -> List[int]:
> +            """
> +            Disable or enable an idle state using the object's stored list of cpus.
> +
> +            Args:
> +                state (int): The cpu idle state index to disable or enable as an int starting from 0.
> +                disabled (int): set to 1 to disable or 0 to enable. Less than 0 is an error.
> +            """
> +            ret = []
> +            for cpu in self.__cpu_list:
> +                ret.append(lcpw.cpuidle_state_disable(cpu, state, disabled))
> +            return ret
> +
> +        def is_disabled_idle_state(self, state) -> List[int]:
> +            """
> +            Query the idle state.
> +
> +            Args:
> +                state: The cpu idle state. 1 is disabled, 0 is enabled. Less than 0 is an error.
> +            """
> +            ret = []
> +            for cpu in self.__cpu_list:
> +                ret.append(lcpw.cpuidle_is_state_disabled(cpu, state))
> +            return ret
> -- 
> 2.49.0
> 
> 
>