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/linux/Documentation/devicetree/bindings/cpu/
H A Didle-states.yaml1 # 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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H A Dcpu-capacity.txt6 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/Documentation/tools/rtla/
H A Dcommon_timerlat_options.rst1 **-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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H A Drtla-timerlat-top.rst2 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/tools/tracing/rtla/src/
H A Dtimerlat_top.c1 // SPDX-License-Identifier: GPL-2.0
50 * timerlat_free_top - free runtime data
55 free(data->cpu_data); in timerlat_free_top()
60 * timerlat_alloc_histogram - alloc runtime data
71 data->nr_cpus = nr_cpus; in timerlat_alloc_top()
74 data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus); in timerlat_alloc_top()
75 if (!data->cpu_data) in timerlat_alloc_top()
80 data->cpu_data[cpu].min_irq = ~0; in timerlat_alloc_top()
81 data->cpu_data[cpu].min_thread = ~0; in timerlat_alloc_top()
82 data->cpu_data[cpu].min_user = ~0; in timerlat_alloc_top()
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H A Dtimerlat_hist.c1 // SPDX-License-Identifier: GPL-2.0
52 * timerlat_free_histogram - free runtime data
60 for (cpu = 0; cpu < data->nr_cpus; cpu++) { in timerlat_free_histogram()
61 if (data->hist[cpu].irq) in timerlat_free_histogram()
62 free(data->hist[cpu].irq); in timerlat_free_histogram()
64 if (data->hist[cpu].thread) in timerlat_free_histogram()
65 free(data->hist[cpu].thread); in timerlat_free_histogram()
67 if (data->hist[cpu].user) in timerlat_free_histogram()
68 free(data->hist[cpu].user); in timerlat_free_histogram()
73 if (data->hist) in timerlat_free_histogram()
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H A Dtimerlat_aa.c1 // SPDX-License-Identifier: GPL-2.0
23 * Per-cpu data statistics and data.
29 /* timerlat IRQ latency */
34 /* timerlat Thread latency */
64 * If now - timestamp is <= latency, it might have influenced
65 * in the timerlat irq latency. Otherwise, ignore it.
135 * timerlat_aa_get_data - Get the per-cpu data from the timerlat context
140 return &taa_ctx->taa_data[cpu]; in timerlat_aa_get_data()
144 * timerlat_aa_irq_latency - Handles timerlat IRQ event
154 taa_data->curr_state = TIMERLAT_WAITING_THREAD; in timerlat_aa_irq_latency()
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/linux/Documentation/devicetree/bindings/thermal/
H A Dthermal-idle.yaml1 # 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/tools/testing/selftests/kvm/
H A Drseq_test.c1 // 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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/linux/drivers/cpuidle/
H A Ddt_idle_states.c1 // 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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/linux/Documentation/devicetree/bindings/arm/
H A Dpsci.yaml1 # 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/Documentation/devicetree/bindings/power/
H A Dpower-domain.yaml1 # 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/tools/testing/selftests/ftrace/test.d/preemptirq/
H A Dirqsoff_tracer.tc2 # 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
/linux/tools/testing/selftests/dma/
H A Ddma_map_benchmark.c1 // 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/tools/testing/selftests/bpf/benchs/
H A Dbench_local_storage_rcu_tasks_trace.c1 // 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/arch/arm64/boot/dts/sprd/
H A Dums9620.dtsi1 // 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/arch/arm64/boot/dts/qcom/
H A Dsm4450.dtsi1 // 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/power/qcom,rpmhpd.h>
14 #include <dt-bindings/power/qcom-rpmpd.h>
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H A Dsdm845-cheza.dtsi1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
8 #include <dt-bindings/input/input.h>
9 #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
25 stdout-path = "serial0:115200n8";
29 compatible = "pwm-backlight";
31 enable-gpios = <&tlmm 37 GPIO_ACTIVE_HIGH>;
32 power-supply = <&ppvar_sys>;
33 pinctrl-names = "default";
34 pinctrl-0 = <&ap_edp_bklten>;
37 /* FIXED REGULATORS - parents above children */
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H A Dsdm630.dtsi1 // SPDX-License-Identifier: BSD-3-Clause
7 #include <dt-bindings/clock/qcom,dsi-phy-28nm.h>
8 #include <dt-bindings/clock/qcom,gcc-sdm660.h>
9 #include <dt-bindings/clock/qcom,gpucc-sdm660.h>
10 #include <dt-bindings/clock/qcom,mmcc-sdm660.h>
11 #include <dt-bindings/clock/qcom,rpmcc.h>
12 #include <dt-bindings/firmware/qcom,scm.h>
13 #include <dt-bindings/interconnect/qcom,sdm660.h>
14 #include <dt-bindings/power/qcom-rpmpd.h>
15 #include <dt-bindings/gpio/gpio.h>
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/linux/drivers/cpuidle/governors/
H A Dmenu.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * menu.c - the menu idle governor
5 * Copyright (C) 2006-2007 Adam Belay <abelay@novell.com>
35 * 2) Latency tolerance (from pmqos infrastructure)
39 * -----------------------
40 * C state entry and exit have an energy cost, and a certain amount of time in
42 * provides us this duration in the "target_residency" field. So all that we
61 * Repeatable-interval-detector
62 * ----------------------------
110 s64 value, min_thresh = -1, max_thresh = UINT_MAX; in get_typical_interval()
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/linux/Documentation/trace/
H A Dftrace.rst2 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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H A Dtimerlat-tracer.rst6 find sources of wakeup latencies of real-time threads. Like cyclictest,
8 computes a *wakeup latency* value as the difference between the *current
13 -----
28 # _-----=> irqs-off
29 # / _----=> need-resched
30 # | / _---=> hardirq/softirq
31 # || / _--=> preempt-depth
34 # TASK-PID CPU# |||| TIMESTAMP ID CONTEXT LATENCY
36 <idle>-0 [000] d.h1 54.029328: #1 context irq timer_latency 932 ns
37 <...>-867 [000] .... 54.029339: #1 context thread timer_latency 11700 ns
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/linux/arch/arm64/boot/dts/arm/
H A Djuno-r2.dts9 /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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H A Djuno.dts4 * 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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H A Djuno-r1.dts9 /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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