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/linux/Documentation/devicetree/bindings/dvfs/
H A Dperformance-domain.yaml4 $id: http://devicetree.org/schemas/dvfs/performance-domain.yaml#
7 title: Generic performance domains
13 This binding is intended for performance management of groups of devices or
14 CPUs that run in the same performance domain. Performance domains must not
15 be confused with power domains. A performance domain is defined by a set
16 of devices that always have to run at the same performance level. For a given
17 performance domain, there is a single point of control that affects all the
18 devices in the domain, making it impossible to set the performance level of
21 have a common frequency control, is said to be in the same performance
24 This device tree binding can be used to bind performance domain consumer
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/linux/include/linux/
H A Denergy_model.h15 * struct em_perf_state - Performance state of a performance domain
16 * @performance: CPU performance (capacity) at a given frequency
25 unsigned long performance; member
35 * EM_PERF_STATE_INEFFICIENT: The performance state is inefficient. There is
36 * in this em_perf_domain, another performance state with a higher frequency
43 * struct em_perf_table - Performance states table
46 * @state: List of performance states, in ascending order
55 * struct em_perf_domain - Performance domain
57 * @nr_perf_states: Number of performance states
60 * for performance reasons to avoid potential cache
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/linux/drivers/acpi/
H A Dprocessor_perflib.c25 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
80 ppc >= pr->performance->state_count) in acpi_processor_get_platform_limit()
98 qos_value = pr->performance->states[index].core_frequency * 1000; in acpi_processor_get_platform_limit()
114 * 0: success. OSPM is now using the performance state specified.
128 if (ignore_ppc || !pr->performance) { in acpi_processor_ppc_has_changed()
158 if (!pr || !pr->performance || !pr->performance->state_count) in acpi_processor_get_bios_limit()
161 *limit = pr->performance->states[pr->performance_platform_limit]. in acpi_processor_get_bios_limit()
245 memcpy(&pr->performance->control_register, obj.buffer.pointer, in acpi_processor_get_performance_control()
261 memcpy(&pr->performance->status_register, obj.buffer.pointer, in acpi_processor_get_performance_control()
329 acpi_handle_debug(pr->handle, "Found %d performance states\n", in acpi_processor_get_performance_states()
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/linux/drivers/perf/
H A DKconfig3 # Performance Monitor Drivers
6 menu "Performance monitor support"
63 Say y if you want to use CPU performance monitors on ARM-based
83 Say y if you want to use CPU performance monitors on RISCV-based
93 Say y if you want to use the legacy CPU performance monitor
103 Say y if you want to use the CPU performance monitor
113 Provide support for StarLink Performance Monitor Unit.
114 StarLink Performance Monitor Unit integrates one or more cores with
137 tristate "ARM SMMUv3 Performance Monitors Extension"
141 Provides support for the ARM SMMUv3 Performance Monitor Counter
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/linux/Documentation/admin-guide/acpi/
H A Dcppc_sysfs.rst4 Collaborative Processor Performance Control (CPPC)
13 performance of a logical processor on a contiguous and abstract performance
14 scale. CPPC exposes a set of registers to describe abstract performance scale,
15 to request performance levels and to measure per-cpu delivered performance.
40 * highest_perf : Highest performance of this processor (abstract scale).
41 * nominal_perf : Highest sustained performance of this processor
43 * lowest_nonlinear_perf : Lowest performance of this processor with nonlinear
45 * lowest_perf : Lowest performance of this processor (abstract scale).
49 The above frequencies should only be used to report processor performance in
53 * feedback_ctrs : Includes both Reference and delivered performance counter.
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H A Dfan_performance_states.rst4 ACPI Fan Performance States
10 These attributes list properties of fan performance states.
37 where each of the "state*" files represents one performance state of the fan
47 to this performance state (0-9).
71 Here use can look at fan performance states for a reference speed (speed_rpm)
74 not defined in the performance states.
80 This sysfs attribute is presented in the same directory as performance states.
82 ACPI Fan Performance Feedback
90 in the same directory as performance states.
/linux/tools/power/x86/x86_energy_perf_policy/
H A Dx86_energy_perf_policy.85 x86_energy_perf_policy \- Manage Energy vs. Performance Policy via x86 Model Specific Registers
18 .RB "value: # | default | performance | balance-performance | balance-power | power"
21 displays and updates energy-performance policy settings specific to
28 and Processor Performance States (P-states).
31 Further, it allows the OS to influence energy/performance trade-offs where there
82 Set a policy with a normal balance between performance and energy efficiency.
83 The processor will tolerate minor performance compromise
88 .I performance
89 Set a policy for maximum performance,
90 accepting no performance sacrifice for the benefit of energy efficiency.
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/linux/Documentation/admin-guide/pm/
H A Dintel-speed-select.rst8 collection of features that give more granular control over CPU performance.
9 With Intel(R) SST, one server can be configured for power and performance for a
15 …tel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enhancing-performance.pdf
25 how these commands change the power and performance profile of the system under
79 Intel(R) Speed Select Technology - Performance Profile (Intel(R) SST-PP)
83 performance requirements. This helps users during deployment as they do not have
85 Technology - Performance Profile (Intel(R) SST-PP) feature introduces a mechanism
86 that allows multiple optimized performance profiles per system. Each profile
89 performance profile and meet CPU online/offline requirement, the user can expect
93 Number or performance levels
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H A Damd-pstate.rst5 ``amd-pstate`` CPU Performance Scaling Driver
16 ``amd-pstate`` is the AMD CPU performance scaling driver that introduces a
19 Performance Control (CPPC) which provides finer grain frequency management
24 communicate the performance hints to hardware.
27 ``ondemand``, etc. to manage the performance hints which are provided by
39 Collaborative Processor Performance Control (CPPC) interface enumerates a
40 continuous, abstract, and unit-less performance value in a scale that is
41 not tied to a specific performance state / frequency. This is an ACPI
42 standard [2]_ which software can specify application performance goals and
45 interpreter for performance adjustments. ``amd-pstate`` will initialize a
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H A Dintel_pstate.rst5 ``intel_pstate`` CPU Performance Scaling Driver
17 :doc:`CPU performance scaling subsystem <cpufreq>` in the Linux kernel
25 than just an operating frequency or an operating performance point (see the
30 uses frequencies for identifying operating performance points of CPUs and
58 active mode, it uses its own internal performance scaling governor algorithm or
59 allows the hardware to do performance scaling by itself, while in the passive
61 a certain performance scaling algorithm. Which of them will be in effect
88 active mode: ``powersave`` and ``performance``. The way they both operate
94 Namely, if that option is set, the ``performance`` algorithm will be used by
117 HWP + ``performance``
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/linux/arch/powerpc/include/asm/
H A Dreg_fsl_emb.h3 * Contains register definitions for the Freescale Embedded Performance
13 /* Performance Monitor Registers */
37 /* Freescale Book E Performance Monitor APU Registers */
38 #define PMRN_PMC0 0x010 /* Performance Monitor Counter 0 */
39 #define PMRN_PMC1 0x011 /* Performance Monitor Counter 1 */
40 #define PMRN_PMC2 0x012 /* Performance Monitor Counter 2 */
41 #define PMRN_PMC3 0x013 /* Performance Monitor Counter 3 */
42 #define PMRN_PMC4 0x014 /* Performance Monitor Counter 4 */
43 #define PMRN_PMC5 0x015 /* Performance Monitor Counter 5 */
84 #define PMRN_UPMC0 0x000 /* User Performance Monitor Counter 0 */
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/linux/drivers/gpu/drm/msm/disp/dpu1/
H A Ddpu_core_perf.h16 * struct dpu_core_perf_params - definition of performance parameters
28 * struct dpu_core_perf_tune - definition of performance tuning control
29 * @mode: performance mode
36 * struct dpu_core_perf - definition of core performance context
37 * @perf_cfg: Platform-specific performance configuration
40 * @perf_tune: debug control for performance tuning
58 * dpu_core_perf_crtc_check - validate performance of the given crtc state
67 * dpu_core_perf_crtc_update - update performance of the given crtc
82 * dpu_core_perf_init - initialize the given core performance context
83 * @perf: Pointer to core performance context
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/linux/Documentation/admin-guide/
H A Dperf-security.rst9 Usage of Performance Counters for Linux (perf_events) [1]_ , [2]_ , [3]_
14 depends on the nature of data that perf_events performance monitoring
15 units (PMU) [2]_ and Perf collect and expose for performance analysis.
16 Collected system and performance data may be split into several
21 its topology, used kernel and Perf versions, performance monitoring
30 faults, CPU migrations), architectural hardware performance counters
46 So, perf_events performance monitoring and observability operations are
56 all kernel security permission checks so perf_events performance
70 as privileged processes with respect to perf_events performance
73 privilege [13]_ (POSIX 1003.1e: 2.2.2.39) for performance monitoring and
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/linux/Documentation/scheduler/
H A Dsched-util-clamp.rst11 feature that allows user space to help in managing the performance requirement
16 performance requirements and restrictions of the tasks, thus it helps the
23 system run at a certain performance point.
26 performance constraints. It consists of two tunables:
31 These two bounds will ensure a task will operate within this performance range
36 performance point to operate at to deliver the desired user experience. Or one
38 much resources and should not go above a specific performance point. Viewing
39 the uclamp values as performance points rather than utilization is a better
44 performance point required by its display pipeline to ensure no frame is
58 resources background tasks are consuming by capping the performance point they
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/linux/arch/x86/events/
H A DKconfig2 menu "Performance monitoring"
5 tristate "Intel uncore performance events"
9 Include support for Intel uncore performance events. These are
13 tristate "Intel/AMD rapl performance events"
17 Include support for Intel and AMD rapl performance events for power
21 tristate "Intel cstate performance events"
25 Include support for Intel cstate performance events for power
38 tristate "AMD Uncore performance events"
42 Include support for AMD uncore performance events for use with
/linux/Documentation/devicetree/bindings/cpufreq/
H A Dcpufreq-mediatek-hw.yaml29 "#performance-domain-cells":
31 Number of cells in a performance domain specifier.
33 performance domains.
39 - "#performance-domain-cells"
53 performance-domains = <&performance 0>;
64 performance: performance-controller@11bc00 {
68 #performance-domain-cells = <1>;
H A Dapple,cluster-cpufreq.yaml15 operating-points-v2 table to define the CPU performance states, with the
34 '#performance-domain-cells':
40 - '#performance-domain-cells'
58 performance-domains = <&cpufreq_e>;
66 performance-domains = <&cpufreq_p>;
106 cpufreq_e: performance-controller@210e20000 {
109 #performance-domain-cells = <0>;
112 cpufreq_p: performance-controller@211e20000 {
115 #performance-domain-cells = <0>;
/linux/Documentation/admin-guide/perf/
H A Dhns3-pmu.rst2 HNS3 Performance Monitoring Unit (PMU)
5 HNS3(HiSilicon network system 3) Performance Monitoring Unit (PMU) is an
6 End Point device to collect performance statistics of HiSilicon SoC NIC.
9 HNS3 PMU supports collection of performance statistics such as bandwidth,
48 Each performance statistic has a pair of events to get two values to
49 calculate real performance data in userspace.
57 computation to calculate real performance data is:::
82 PMU collect performance statistics for all HNS3 PCIe functions of IO DIE.
89 PMU collect performance statistic of one whole physical port. The port id
98 PMU collect performance statistic of one tc of physical port. The port id
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/linux/drivers/cpufreq/
H A Damd-pstate.h18 * @aperf: actual performance frequency clock count
19 * @mperf: maximum performance frequency clock count
32 * @cppc_req_cached: cached performance request hints
33 * @highest_perf: the maximum performance an individual processor may reach,
38 * @nominal_perf: the maximum sustained performance level of the processor,
40 * @lowest_nonlinear_perf: the lowest performance level at which nonlinear power
42 * @lowest_perf: the absolute lowest performance level of the processor
45 * @min_limit_perf: Cached value of the performance corresponding to policy->min
46 * @max_limit_perf: Cached value of the performance corresponding to policy->max
60 * @epp_policy: Last saved policy used to set energy-performance preference
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/linux/Documentation/ABI/testing/
H A Dsysfs-bus-event_source-devices-hv_gpci100 runtime by setting "Enable Performance Information Collection" option.
107 * "-EPERM" : Partition is not permitted to retrieve performance information,
108 required to set "Enable Performance Information Collection" option.
132 runtime by setting "Enable Performance Information Collection" option.
139 * "-EPERM" : Partition is not permitted to retrieve performance information,
140 required to set "Enable Performance Information Collection" option.
164 runtime by setting "Enable Performance Information Collection" option.
171 * "-EPERM" : Partition is not permitted to retrieve performance information,
172 required to set "Enable Performance Information Collection" option.
196 runtime by setting "Enable Performance Information Collection" option.
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/linux/Documentation/power/
H A Denergy-model.rst11 the power consumed by devices at various performance levels, and the kernel
68 'performance domain' in the system. A performance domain is a group of CPUs
69 whose performance is scaled together. Performance domains generally have a
70 1-to-1 mapping with CPUFreq policies. All CPUs in a performance domain are
71 required to have the same micro-architecture. CPUs in different performance
94 It is possible also to modify the CPU performance values for each EM's
95 performance state. Thus, the full power and performance profile (which
109 2.2 Registration of performance domains
118 the real power measurements performed for each performance state. Thus, this
122 Drivers are expected to register performance domains into the EM framework by
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/linux/kernel/power/
H A Denergy_model.c21 * Mutex serializing the registrations of performance domains and letting
65 DEFINE_EM_DBG_SHOW(performance, performance);
95 debugfs_create_file("performance", 0444, d, &em_dbg[i], in em_debug_create_ps()
125 /* Create the directory of the performance domain */ in em_debug_create_pd()
140 /* Create a sub-directory for each performance state */ in em_debug_create_pd()
195 * @pd : EM performance domain for which this must be done
230 * Calculate the performance value for each frequency with in em_init_performance()
237 table[i].performance = div64_u64(max_cap * table[i].frequency, in em_init_performance()
248 /* Compute the cost of each performance state. */ in em_compute_costs()
262 cost = power_res / table[i].performance; in em_compute_costs()
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/linux/tools/power/cpupower/bench/
H A DREADME-BENCH7 - Identify worst case performance loss when doing dynamic frequency
12 - Identify cpufreq related performance regressions between kernels
18 - Power saving related regressions (In fact as better the performance
28 For that purpose, it compares the performance governor to a configured
56 takes on this machine and needs to be run in a loop using the performance
58 Then the above test runs are processed using the performance governor
61 on full performance and you get the overall performance loss.
80 trigger of the cpufreq-bench, you will see no performance loss (compare with
84 will always see 50% loads and you get worst performance impact never
/linux/Documentation/userspace-api/
H A Dsysfs-platform_profile.rst5 On modern systems the platform performance, temperature, fan and other
13 operation or towards performance.
19 NOT a goal of this API to allow monitoring the resulting performance
20 characteristics. Monitoring performance is best done with device/vendor
23 Specifically when selecting a high performance profile the actual achieved
24 performance may be limited by various factors such as: the heat generated
28 performance level.
/linux/drivers/perf/hisilicon/
H A DKconfig6 Support for HiSilicon SoC L3 Cache performance monitor, Hydra Home
7 Agent performance monitor and DDR Controller performance monitor.
13 Provide support for HiSilicon PCIe performance monitoring unit (PMU)
23 Provide support for HNS3 performance monitoring unit (PMU) RCiEP

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