| /kernel/linux/linux-5.10/Documentation/admin-guide/pm/ |
| D | cpuidle.rst | 8 CPU Idle Time Management
21 memory or executed. Those states are the *idle* states of the processor.
23 Since part of the processor hardware is not used in idle states, entering them
27 CPU idle time management is an energy-efficiency feature concerned about using
28 the idle states of processors for this purpose.
33 CPU idle time management operates on CPUs as seen by the *CPU scheduler* (that
44 enter an idle state, that applies to the processor as a whole.
52 enter an idle state, that applies to the core that asked for it in the first
56 except for one have been put into idle states at the "core level" and the
57 remaining core asks the processor to enter an idle state, that may trigger it
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| D | intel_idle.rst | 5 ``intel_idle`` CPU Idle Time Management Driver
17 :doc:`CPU idle time management subsystem <cpuidle>` in the Linux kernel
18 (``CPUIdle``). It is the default CPU idle time management driver for the
27 logical CPU executing it is idle and so it may be possible to put some of the
42 .. _intel-idle-enumeration-of-states:
44 Enumeration of Idle States
50 as C-states (in the ACPI terminology) or idle states. The list of meaningful
51 ``MWAIT`` hint values and idle states (i.e. low-power configurations of the
55 In order to create a list of available idle states required by the ``CPUIdle``
56 subsystem (see :ref:`idle-states-representation` in :doc:`cpuidle`),
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| /kernel/linux/linux-6.6/Documentation/admin-guide/pm/ |
| D | cpuidle.rst | 8 CPU Idle Time Management
21 memory or executed. Those states are the *idle* states of the processor.
23 Since part of the processor hardware is not used in idle states, entering them
27 CPU idle time management is an energy-efficiency feature concerned about using
28 the idle states of processors for this purpose.
33 CPU idle time management operates on CPUs as seen by the *CPU scheduler* (that
44 enter an idle state, that applies to the processor as a whole.
52 enter an idle state, that applies to the core that asked for it in the first
56 except for one have been put into idle states at the "core level" and the
57 remaining core asks the processor to enter an idle state, that may trigger it
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| D | intel_idle.rst | 5 ``intel_idle`` CPU Idle Time Management Driver
17 :doc:`CPU idle time management subsystem <cpuidle>` in the Linux kernel
18 (``CPUIdle``). It is the default CPU idle time management driver for the
27 logical CPU executing it is idle and so it may be possible to put some of the
42 .. _intel-idle-enumeration-of-states:
44 Enumeration of Idle States
50 as C-states (in the ACPI terminology) or idle states. The list of meaningful
51 ``MWAIT`` hint values and idle states (i.e. low-power configurations of the
55 In order to create a list of available idle states required by the ``CPUIdle``
56 subsystem (see :ref:`idle-states-representation` in
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| /kernel/linux/linux-6.6/drivers/powercap/ |
| D | idle_inject.c | 7 * The idle injection framework provides a way to force CPUs to enter idle
13 * All of the kthreads used for idle injection are created at init time.
15 * Next, the users of the idle injection framework provide a cpumask via
19 * The idle + run duration is specified via separate helpers and that allows
20 * idle injection to be started.
22 * The idle injection kthreads will call play_idle_precise() with the idle
25 * After all of them have been woken up, a timer is set to start the next idle
28 * The timer interrupt handler will wake up the idle injection kthreads for
31 * Idle injection is stopped synchronously and no leftover idle injection
35 * synchronization to prevent race conditions like starting idle injection
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| /kernel/linux/linux-5.10/drivers/powercap/ |
| D | idle_inject.c | 7 * The idle injection framework provides a way to force CPUs to enter idle
13 * All of the kthreads used for idle injection are created at init time.
15 * Next, the users of the the idle injection framework provide a cpumask via
19 * The idle + run duration is specified via separate helpers and that allows
20 * idle injection to be started.
22 * The idle injection kthreads will call play_idle_precise() with the idle
25 * After all of them have been woken up, a timer is set to start the next idle
28 * The timer interrupt handler will wake up the idle injection kthreads for
31 * Idle injection is stopped synchronously and no leftover idle injection
35 * synchronization to prevent race conditions like starting idle injection
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| /kernel/linux/linux-5.10/Documentation/devicetree/bindings/powerpc/opal/ |
| D | power-mgt.txt | 5 idle states. The description of these idle states is exposed via the
10 Typically each idle state has the following associated properties:
12 - name: The name of the idle state as defined by the firmware.
14 - flags: indicating some aspects of this idle states such as the
16 idle states and so on. The flag bits are as follows:
19 CPU from idle to running.
22 this idle state in order to accrue power-savings
27 The following properties provide details about the idle states. These
29 provides the value of that property for the idle state associated with
32 If idle-states are defined, then the properties
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| /kernel/linux/linux-6.6/Documentation/devicetree/bindings/powerpc/opal/ |
| D | power-mgt.txt | 5 idle states. The description of these idle states is exposed via the
10 Typically each idle state has the following associated properties:
12 - name: The name of the idle state as defined by the firmware.
14 - flags: indicating some aspects of this idle states such as the
16 idle states and so on. The flag bits are as follows:
19 CPU from idle to running.
22 this idle state in order to accrue power-savings
27 The following properties provide details about the idle states. These
29 provides the value of that property for the idle state associated with
32 If idle-states are defined, then the properties
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| /kernel/linux/linux-6.6/Documentation/devicetree/bindings/memory-controllers/ |
| D | rockchip,rk3399-dmc.yaml | 60 Configure the PD_IDLE value. Defines the power-down idle period in which
61 memories are placed into power-down mode if bus is idle for PD_IDLE DFI
63 See also rockchip,pd-idle-ns.
69 Configure the SR_IDLE value. Defines the self-refresh idle period in
70 which memories are placed into self-refresh mode if bus is idle for
72 See also rockchip,sr-idle-ns.
79 Defines the memory self-refresh and controller clock gating idle period.
81 arg gating started if bus is idle for sr_mc_gate_idle*1024 DFI clock
83 See also rockchip,sr-mc-gate-idle-ns.
89 Defines the self-refresh power down idle period in which memories are
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| /kernel/linux/linux-6.6/drivers/cpuidle/ |
| D | Kconfig.arm | 3 # ARM CPU Idle drivers
6 bool "Generic ARM CPU idle Driver"
12 It provides a generic idle driver whose idle states are configured
14 initialized by calling the CPU operations init idle hook
18 bool "PSCI CPU idle Driver"
24 It provides an idle driver that is capable of detecting and
25 managing idle states through the PSCI firmware interface.
28 - If the idle states are described with the non-hierarchical layout,
29 all idle states are still available.
31 - If the idle states are described with the hierarchical layout,
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| /kernel/linux/linux-5.10/arch/s390/kernel/ |
| D | idle.c | 3 * Idle functions for s390.
26 struct s390_idle_data *idle = this_cpu_ptr(&s390_idle); in enabled_wait() local
38 psw_idle(idle, psw_mask); in enabled_wait()
41 /* Account time spent with enabled wait psw loaded as idle time. */ in enabled_wait()
42 raw_write_seqcount_begin(&idle->seqcount); in enabled_wait()
43 idle_time = idle->clock_idle_exit - idle->clock_idle_enter; in enabled_wait()
44 idle->clock_idle_enter = idle->clock_idle_exit = 0ULL; in enabled_wait()
45 idle->idle_time += idle_time; in enabled_wait()
46 idle->idle_count++; in enabled_wait()
48 raw_write_seqcount_end(&idle->seqcount); in enabled_wait()
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| /kernel/linux/linux-5.10/Documentation/devicetree/bindings/arm/ |
| D | idle-states.yaml | 4 $id: http://devicetree.org/schemas/arm/idle-states.yaml#
7 title: ARM idle states binding description
20 range of dynamic idle states that a processor can enter at run-time, can be
22 enter/exit specific idle states on a given processor.
35 PM implementation to put the processor in different idle states (which include
36 states listed above; "off" state is not an idle state since it does not have
39 Idle state parameters (e.g. entry latency) are platform specific and need to
43 The device tree binding definition for ARM idle states is the subject of this
47 2 - idle-states definitions
50 Idle states are characterized for a specific system through a set of
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| /kernel/linux/linux-6.6/Documentation/devicetree/bindings/cpu/ |
| D | idle-states.yaml | 4 $id: http://devicetree.org/schemas/cpu/idle-states.yaml#
7 title: Idle states
21 representing the range of dynamic idle states that a processor can enter at
23 parameters required to enter/exit specific idle states on a given processor.
26 2 - ARM idle states
40 PM implementation to put the processor in different idle states (which include
41 states listed above; "off" state is not an idle state since it does not have
44 Idle state parameters (e.g. entry latency) are platform specific and need to
48 The device tree binding definition for ARM idle states is the subject of this
52 3 - RISC-V idle states
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| /kernel/linux/linux-5.10/drivers/cpuidle/ |
| D | Kconfig.arm | 3 # ARM CPU Idle drivers
6 bool "Generic ARM/ARM64 CPU idle Driver"
11 It provides a generic idle driver whose idle states are configured
13 initialized by calling the CPU operations init idle hook
17 bool "PSCI CPU idle Driver"
23 It provides an idle driver that is capable of detecting and
24 managing idle states through the PSCI firmware interface.
27 bool "PSCI CPU idle Domain"
34 idle states.
44 Select this option to enable CPU idle driver for big.LITTLE based
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| /kernel/linux/linux-5.10/Documentation/driver-api/thermal/ |
| D | intel_powerclamp.rst | 15 - Idle Injection
44 idle injection across all online CPU threads was introduced. The goal
55 Idle Injection
68 If the kernel can also inject idle time to the system, then a
71 control system, where the target set point is a user-selected idle
73 between the actual package level C-state residency ratio and the target idle
81 thread synchronizes its idle time and duration, based on the rounding
89 Alignment of idle time around jiffies ensures scalability for HZ
92 kidle_inject/cpu. During idle injection, it runs monitor/mwait idle
96 The NOHZ schedule tick is disabled during idle time, but interrupts
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| D | cpu-idle-cooling.rst | 4 CPU Idle Cooling
37 decrease. Acting on the idle state duration or the idle cycle
47 At a specific OPP, we can assume that injecting idle cycle on all CPUs
49 idle state target residency, we lead to dropping the static and the
51 this state). So the sustainable power with idle cycles has a linear
57 Idle Injection:
60 The base concept of the idle injection is to force the CPU to go to an
61 idle state for a specified time each control cycle, it provides
64 their idle cycles synchronously, the cluster can reach its power down
66 to almost zero. However, these idle cycles injection will add extra
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| /kernel/linux/linux-6.6/Documentation/admin-guide/thermal/ |
| D | intel_powerclamp.rst | 15 - Idle Injection
46 idle injection across all online CPU threads was introduced. The goal
57 Idle Injection
70 If the kernel can also inject idle time to the system, then a
73 control system, where the target set point is a user-selected idle
75 between the actual package level C-state residency ratio and the target idle
83 thread synchronizes its idle time and duration, based on the rounding
91 Alignment of idle time around jiffies ensures scalability for HZ
94 kidle_inject/cpu. During idle injection, it runs monitor/mwait idle
98 The NOHZ schedule tick is disabled during idle time, but interrupts
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| /kernel/linux/linux-6.6/Documentation/driver-api/pm/ |
| D | cpuidle.rst | 5 CPU Idle Time Management
13 CPU Idle Time Management Subsystem
18 cores) is idle after an interrupt or equivalent wakeup event, which means that
19 there are no tasks to run on it except for the special "idle" task associated
21 belongs to. That can be done by making the idle logical CPU stop fetching
23 depended on by it into an idle state in which they will draw less power.
25 However, there may be multiple different idle states that can be used in such a
28 particular idle state. That is the role of the CPU idle time management
35 units: *governors* responsible for selecting idle states to ask the processor
40 CPU Idle Time Governors
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| /kernel/linux/linux-5.10/Documentation/driver-api/pm/ |
| D | cpuidle.rst | 5 CPU Idle Time Management
13 CPU Idle Time Management Subsystem
18 cores) is idle after an interrupt or equivalent wakeup event, which means that
19 there are no tasks to run on it except for the special "idle" task associated
21 belongs to. That can be done by making the idle logical CPU stop fetching
23 depended on by it into an idle state in which they will draw less power.
25 However, there may be multiple different idle states that can be used in such a
28 particular idle state. That is the role of the CPU idle time management
35 units: *governors* responsible for selecting idle states to ask the processor
40 CPU Idle Time Governors
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| /kernel/linux/linux-5.10/drivers/cpuidle/governors/ |
| D | teo.c | 3 * Timer events oriented CPU idle governor
11 * wakeups from idle states. Moreover, information about what happened in the
13 * idle state with target residency within the time to the closest timer is
14 * likely to be suitable for the upcoming idle time of the CPU and, if not, then
15 * which of the shallower idle states to choose.
18 * they can be covered by taking a few most recent idle time intervals of the
20 * idle duration values greater than the time till the closest timer, as the
24 * Thus this governor estimates whether or not the upcoming idle time of the CPU
26 * idle state for it in accordance with that, as follows:
28 * - Find an idle state on the basis of the sleep length and state statistics
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| /kernel/linux/linux-6.6/arch/s390/kernel/ |
| D | idle.c | 3 * Idle functions for s390.
26 struct s390_idle_data *idle = this_cpu_ptr(&s390_idle); in account_idle_time_irq() local
34 this_cpu_add(mt_cycles[i], cycles_new[i] - idle->mt_cycles_enter[i]); in account_idle_time_irq()
37 idle_time = S390_lowcore.int_clock - idle->clock_idle_enter; in account_idle_time_irq()
39 S390_lowcore.steal_timer += idle->clock_idle_enter - S390_lowcore.last_update_clock; in account_idle_time_irq()
42 S390_lowcore.system_timer += S390_lowcore.last_update_timer - idle->timer_idle_enter; in account_idle_time_irq()
45 /* Account time spent with enabled wait psw loaded as idle time. */ in account_idle_time_irq()
46 WRITE_ONCE(idle->idle_time, READ_ONCE(idle->idle_time) + idle_time); in account_idle_time_irq()
47 WRITE_ONCE(idle->idle_count, READ_ONCE(idle->idle_count) + 1); in account_idle_time_irq()
53 struct s390_idle_data *idle = this_cpu_ptr(&s390_idle); in arch_cpu_idle() local
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| /kernel/linux/linux-6.6/Documentation/driver-api/thermal/ |
| D | cpu-idle-cooling.rst | 4 CPU Idle Cooling
37 decrease. Acting on the idle state duration or the idle cycle
47 At a specific OPP, we can assume that injecting idle cycle on all CPUs
49 idle state target residency, we lead to dropping the static and the
51 this state). So the sustainable power with idle cycles has a linear
57 Idle Injection:
60 The base concept of the idle injection is to force the CPU to go to an
61 idle state for a specified time each control cycle, it provides
64 their idle cycles synchronously, the cluster can reach its power down
66 to almost zero. However, these idle cycles injection will add extra
[all …]
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| /kernel/linux/linux-5.10/Documentation/devicetree/bindings/arm/msm/ |
| D | qcom,idle-state.txt | 1 QCOM Idle States for cpuidle driver
3 ARM provides idle-state node to define the cpuidle states, as defined in [1].
4 cpuidle-qcom is the cpuidle driver for Qualcomm SoCs and uses these idle
5 states. Idle states have different enter/exit latency and residency values.
6 The idle states supported by the QCOM SoC are defined as -
18 hierarchy to enter standby states, when all cpus are idle. An interrupt brings
34 between the time it enters idle and the next known wake up. SPC mode is used
37 sequence for this idle state is programmed to power down the supply to the
58 The idle-state for QCOM SoCs are distinguished by the compatible property of
59 the idle-states device node.
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| /kernel/linux/linux-6.6/Documentation/devicetree/bindings/arm/msm/ |
| D | qcom,idle-state.txt | 1 QCOM Idle States for cpuidle driver
3 ARM provides idle-state node to define the cpuidle states, as defined in [1].
4 cpuidle-qcom is the cpuidle driver for Qualcomm SoCs and uses these idle
5 states. Idle states have different enter/exit latency and residency values.
6 The idle states supported by the QCOM SoC are defined as -
18 hierarchy to enter standby states, when all cpus are idle. An interrupt brings
34 between the time it enters idle and the next known wake up. SPC mode is used
37 sequence for this idle state is programmed to power down the supply to the
58 The idle-state for QCOM SoCs are distinguished by the compatible property of
59 the idle-states device node.
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| /kernel/linux/linux-6.6/arch/powerpc/include/asm/ |
| D | idle.h | 46 * Indicate to the HV that we are idle. Now would be in pseries_idle_prolog()
49 get_lppaca()->idle = 1; in pseries_idle_prolog()
56 get_lppaca()->idle = 0; in pseries_idle_epilog()
63 * If we are reading from an idle context, update the in read_this_idle_purr()
64 * idle-purr cycles corresponding to the last idle period. in read_this_idle_purr()
65 * Since the idle context is not yet over, take a fresh in read_this_idle_purr()
66 * snapshot of the idle-purr. in read_this_idle_purr()
68 if (unlikely(get_lppaca()->idle == 1)) { in read_this_idle_purr()
79 * If we are reading from an idle context, update the in read_this_idle_spurr()
80 * idle-spurr cycles corresponding to the last idle period. in read_this_idle_spurr()
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