| /linux-6.12.1/Documentation/devicetree/bindings/cpu/ |
| D | idle-states.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/cpu/idle-states.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
11 - Anup Patel <anup@brainfault.org>
15 1 - Introduction
18 ARM and RISC-V systems contain HW capable of managing power consumption
19 dynamically, where cores can be put in different low-power states (ranging
22 run-time, can be specified through device tree bindings representing the
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| D | cpu-capacity.txt | 6 1 - Introduction
15 2 - CPU capacity definition
19 heterogeneity. Such heterogeneity can come from micro-architectural differences
23 capture a first-order approximation of the relative performance of CPUs.
29 * A "single-threaded" or CPU affine benchmark
43 3 - capacity-dmips-mhz
46 capacity-dmips-mhz is an optional cpu node [1] property: u32 value
51 capacity-dmips-mhz property is all-or-nothing: if it is specified for a cpu
54 available, final capacities are calculated by directly using capacity-dmips-
58 4 - Examples
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| /linux-6.12.1/Documentation/devicetree/bindings/power/ |
| D | domain-idle-state.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/power/domain-idle-state.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Ulf Hansson <ulf.hansson@linaro.org>
18 const: domain-idle-states
21 "^(cpu|cluster|domain)-":
29 const: domain-idle-state
31 entry-latency-us:
33 The worst case latency in microseconds required to enter the idle
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| D | power-domain.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/power/power-domain.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Rafael J. Wysocki <rjw@rjwysocki.net>
11 - Kevin Hilman <khilman@kernel.org>
12 - Ulf Hansson <ulf.hansson@linaro.org>
25 \#power-domain-cells property in the PM domain provider node.
29 pattern: "^(power-controller|power-domain|performance-domain)([@-].*)?$"
31 domain-idle-states:
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| /linux-6.12.1/Documentation/devicetree/bindings/thermal/ |
| D | thermal-idle.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 ---
5 $id: http://devicetree.org/schemas/thermal/thermal-idle.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Daniel Lezcano <daniel.lezcano@linaro.org>
22 const: thermal-idle
24 A thermal-idle node describes the idle cooling device properties to
27 '#cooling-cells':
31 the cooling-maps reference. The first cell is the minimum cooling state
34 duration-us:
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| /linux-6.12.1/tools/tracing/rtla/src/ |
| D | timerlat_top.c | 1 // SPDX-License-Identifier: GPL-2.0
83 * timerlat_free_top - free runtime data
88 free(data->cpu_data); in timerlat_free_top()
93 * timerlat_alloc_histogram - alloc runtime data
104 data->nr_cpus = nr_cpus; in timerlat_alloc_top()
107 data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus); in timerlat_alloc_top()
108 if (!data->cpu_data) in timerlat_alloc_top()
113 data->cpu_data[cpu].min_irq = ~0; in timerlat_alloc_top()
114 data->cpu_data[cpu].min_thread = ~0; in timerlat_alloc_top()
115 data->cpu_data[cpu].min_user = ~0; in timerlat_alloc_top()
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| D | timerlat_hist.c | 1 // SPDX-License-Identifier: GPL-2.0
90 * timerlat_free_histogram - free runtime data
98 for (cpu = 0; cpu < data->nr_cpus; cpu++) { in timerlat_free_histogram()
99 if (data->hist[cpu].irq) in timerlat_free_histogram()
100 free(data->hist[cpu].irq); in timerlat_free_histogram()
102 if (data->hist[cpu].thread) in timerlat_free_histogram()
103 free(data->hist[cpu].thread); in timerlat_free_histogram()
105 if (data->hist[cpu].user) in timerlat_free_histogram()
106 free(data->hist[cpu].user); in timerlat_free_histogram()
111 if (data->hist) in timerlat_free_histogram()
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| D | timerlat_aa.c | 1 // SPDX-License-Identifier: GPL-2.0
25 * Per-cpu data statistics and data.
31 /* timerlat IRQ latency */
36 /* timerlat Thread latency */
66 * If now - timestamp is <= latency, it might have influenced
67 * in the timerlat irq latency. Otherwise, ignore it.
137 * timerlat_aa_get_data - Get the per-cpu data from the timerlat context
142 return &taa_ctx->taa_data[cpu]; in timerlat_aa_get_data()
146 * timerlat_aa_irq_latency - Handles timerlat IRQ event
156 taa_data->curr_state = TIMERLAT_WAITING_THREAD; in timerlat_aa_irq_latency()
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| /linux-6.12.1/drivers/cpuidle/ |
| D | dt_idle_states.c | 1 // SPDX-License-Identifier: GPL-2.0-only
9 #define pr_fmt(fmt) "DT idle-states: " fmt
32 idle_state->enter = match_id->data; in init_state_node()
38 idle_state->enter_s2idle = match_id->data; in init_state_node()
40 err = of_property_read_u32(state_node, "wakeup-latency-us", in init_state_node()
41 &idle_state->exit_latency); in init_state_node()
45 err = of_property_read_u32(state_node, "entry-latency-us", in init_state_node()
48 pr_debug(" * %pOF missing entry-latency-us property\n", in init_state_node()
50 return -EINVAL; in init_state_node()
53 err = of_property_read_u32(state_node, "exit-latency-us", in init_state_node()
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| D | cpuidle-pseries.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * cpuidle-pseries - idle state cpuidle driver.
47 dev->poll_time_limit = false; in snooze_loop()
58 dev->poll_time_limit = true; in snooze_loop()
80 * were soft-disabled in check_and_cede_processor()
94 * "ibm,get-systems-parameter" RTAS call with the token
100 * table with all the parameters to ibm,get-system-parameters.
101 * CEDE_LATENCY_TOKEN corresponds to the token value for Cede Latency
107 * If the platform supports the cede latency settings information system
111 * a. The first byte is the length “N” of each cede latency setting record minus
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| /linux-6.12.1/Documentation/devicetree/bindings/arm/ |
| D | psci.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
15 processors") can be used by Linux to initiate various CPU-centric power
25 r0 => 32-bit Function ID / return value
26 {r1 - r3} => Parameters
40 - description:
44 - description:
52 - const: arm,psci-0.2
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| /linux-6.12.1/Documentation/tools/rtla/ |
| D | common_timerlat_options.rst | 1 **-a**, **--auto** *us*
4 while debugging the system. It is equivalent to use **-T** *us* **-s** *us*
5 **-t**. By default, *timerlat* tracer uses FIFO:95 for *timerlat* threads,
6 thus equilavent to **-P** *f:95*.
8 **-p**, **--period** *us*
12 **-i**, **--irq** *us*
14 Stop trace if the *IRQ* latency is higher than the argument in us.
16 **-T**, **--thread** *us*
18 Stop trace if the *Thread* latency is higher than the argument in us.
20 **-s**, **--stack** *us*
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| D | rtla-timerlat-top.rst | 2 rtla-timerlat-top
4 -------------------------------------------
5 Measures the operating system timer latency
6 -------------------------------------------
22 seem with the option **-T**.
35 **--aa-only** *us*
38 Print the auto-analysis if the system hits the stop tracing condition. This option
45 In the example below, the timerlat tracer is dispatched in cpus *1-23* in the
46 automatic trace mode, instructing the tracer to stop if a *40 us* latency or
49 # timerlat -a 40 -c 1-23 -q
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| /linux-6.12.1/tools/testing/selftests/ftrace/test.d/preemptirq/ |
| D | irqsoff_tracer.tc | 2 # SPDX-License-Identifier: GPL-2.0
46 grep -q "tracer: preemptoff" trace || fail
49 grep -E -q "5.....us : <stack trace>" trace || fail
51 # Check for 500ms of latency
52 grep -E -q "latency: 5..... us" trace || fail
69 grep -q "tracer: irqsoff" trace || fail
72 grep -E -q "5.....us : <stack trace>" trace || fail
74 # Check for 500ms of latency
75 grep -E -q "latency: 5..... us" trace || fail
78 exit 0
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| /linux-6.12.1/drivers/cpuidle/governors/ |
| D | menu.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * menu.c - the menu idle governor
5 * Copyright (C) 2006-2007 Adam Belay <abelay@novell.com>
36 * 3) Latency tolerance (from pmqos infrastructure)
40 * -----------------------
41 * C state entry and exit have an energy cost, and a certain amount of time in
43 * provides us this duration in the "target_residency" field. So all that we
68 * Repeatable-interval-detector
69 * ----------------------------
79 * ---------------------------
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| /linux-6.12.1/tools/testing/selftests/dma/ |
| D | dma_map_benchmark.c | 1 // SPDX-License-Identifier: GPL-2.0-only
29 int threads = 1, seconds = 20, node = -1; in main()
37 while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) { in main()
61 return -1; in main()
66 fprintf(stderr, "invalid number of threads, must be in 1-%d\n", in main()
68 exit(1); in main()
72 fprintf(stderr, "invalid number of seconds, must be in 1-%d\n", in main()
74 exit(1); in main()
78 fprintf(stderr, "invalid transmit delay, must be in 0-%ld\n", in main()
80 exit(1); in main()
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| /linux-6.12.1/tools/testing/selftests/bpf/benchs/ |
| D | bench_local_storage_rcu_tasks_trace.c | 1 // SPDX-License-Identifier: GPL-2.0
72 fprintf(stderr, "benchmark doesn't support multi-producer!\n"); in validate()
73 exit(1); in validate()
77 exit(1); in validate()
83 exit(1); in validate()
94 return -1; in kthread_pid_ticks()
112 exit(1); in kthread_pid_ticks()
169 if (!bpf_program__attach(ctx.skel->progs.get_local)) { in local_storage_tasks_trace_setup()
174 if (!bpf_program__attach(ctx.skel->progs.pregp_step)) { in local_storage_tasks_trace_setup()
179 if (!bpf_program__attach(ctx.skel->progs.postgp)) { in local_storage_tasks_trace_setup()
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| /linux-6.12.1/arch/arm64/boot/dts/sprd/ |
| D | ums9620.dtsi | 1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
8 #include <dt-bindings/interrupt-controller/arm-gic.h>
11 interrupt-parent = <&gic>;
12 #address-cells = <2>;
13 #size-cells = <2>;
16 #address-cells = <2>;
17 #size-cells = <0>;
19 cpu-map {
50 compatible = "arm,cortex-a55";
52 enable-method = "psci";
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| /linux-6.12.1/arch/arm64/boot/dts/qcom/ |
| D | sm4450.dtsi | 1 // SPDX-License-Identifier: BSD-3-Clause
6 #include <dt-bindings/clock/qcom,rpmh.h>
7 #include <dt-bindings/clock/qcom,sm4450-camcc.h>
8 #include <dt-bindings/clock/qcom,sm4450-dispcc.h>
9 #include <dt-bindings/clock/qcom,sm4450-gcc.h>
10 #include <dt-bindings/clock/qcom,sm4450-gpucc.h>
11 #include <dt-bindings/gpio/gpio.h>
12 #include <dt-bindings/interrupt-controller/arm-gic.h>
13 #include <dt-bindings/soc/qcom,rpmh-rsc.h>
16 interrupt-parent = <&intc>;
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| D | sc7180-firmware-tfa.dtsi | 1 // SPDX-License-Identifier: BSD-3-Clause
4 * Devices that use SC7180 with TrustedFirmware-A
10 /delete-property/ power-domains;
11 /delete-property/ power-domain-names;
13 cpu-idle-states = <&LITTLE_CPU_SLEEP_0
19 /delete-property/ power-domains;
20 /delete-property/ power-domain-names;
22 cpu-idle-states = <&LITTLE_CPU_SLEEP_0
28 /delete-property/ power-domains;
29 /delete-property/ power-domain-names;
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| /linux-6.12.1/Documentation/trace/ |
| D | ftrace.rst | 2 ftrace - Function Tracer
13 - Written for: 2.6.28-rc2
14 - Updated for: 3.10
15 - Updated for: 4.13 - Copyright 2017 VMware Inc. Steven Rostedt
16 - Converted to rst format - Changbin Du <changbin.du@intel.com>
19 ------------
24 performance issues that take place outside of user-space.
28 There's latency tracing to examine what occurs between interrupts
41 ----------------------
43 See Documentation/trace/ftrace-design.rst for details for arch porters and such.
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| /linux-6.12.1/arch/arm64/boot/dts/arm/ |
| D | juno-r2.dts | 9 /dts-v1/;
11 #include <dt-bindings/interrupt-controller/arm-gic.h>
12 #include <dt-bindings/arm/coresight-cti-dt.h>
13 #include "juno-base.dtsi"
14 #include "juno-cs-r1r2.dtsi"
18 compatible = "arm,juno-r2", "arm,juno", "arm,vexpress";
19 interrupt-parent = <&gic>;
20 #address-cells = <2>;
21 #size-cells = <2>;
28 stdout-path = "serial0:115200n8";
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| D | juno.dts | 4 * Copyright (c) 2013-2014 ARM Ltd.
9 /dts-v1/;
11 #include <dt-bindings/interrupt-controller/arm-gic.h>
12 #include <dt-bindings/arm/coresight-cti-dt.h>
13 #include "juno-base.dtsi"
18 interrupt-parent = <&gic>;
19 #address-cells = <2>;
20 #size-cells = <2>;
27 stdout-path = "serial0:115200n8";
31 compatible = "arm,psci-0.2";
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| D | juno-r1.dts | 9 /dts-v1/;
11 #include <dt-bindings/interrupt-controller/arm-gic.h>
12 #include <dt-bindings/arm/coresight-cti-dt.h>
13 #include "juno-base.dtsi"
14 #include "juno-cs-r1r2.dtsi"
18 compatible = "arm,juno-r1", "arm,juno", "arm,vexpress";
19 interrupt-parent = <&gic>;
20 #address-cells = <2>;
21 #size-cells = <2>;
28 stdout-path = "serial0:115200n8";
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| /linux-6.12.1/tools/testing/selftests/kvm/ |
| D | rseq_test.c | 1 // SPDX-License-Identifier: GPL-2.0-only
33 * Any bug related to task migration is likely to be timing-dependent; perform
89 * is in-progress, while a completely different count indicates in migration_worker()
96 * stable, i.e. while changing affinity is in-progress. in migration_worker()
108 * Wait 1-10us before proceeding to the next iteration and more in migration_worker()
118 * the guest, the guest will trigger a IO/MMIO exit all the in migration_worker()
120 * the generic "exit to userspace" logic, not by KVM. The in migration_worker()
121 * exit to userspace is necessary to give the test a chance in migration_worker()
125 * to trigger an exit that is handled by KVM, but any such in migration_worker()
126 * exit requires architecture specific code. in migration_worker()
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