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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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/linux/Documentation/devicetree/bindings/power/
H A Ddomain-idle-state.yaml1 # 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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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/tracing/rtla/sample/
H A Dtimerlat_load.py2 # SPDX-License-Identifier: GPL-2.0-only
7 # so rtla can measure and provide auto-analysis for the overall latency (IOW
10 # Before running it, you need to dispatch timerlat with -U option in a terminal.
13 # timerlat_load.py 1 -p 95
15 # The "Timerlat IRQ" is the IRQ latency, The thread latency is the latency
16 # for the python process to get the CPU. The Ret from user Timer Latency is
17 # the overall latency. In other words, it is the response time for that
21 # It is in python because it is easy to read :-)
27 parser = argparse.ArgumentParser(description='user-space timerlat thread in Python')
29 parser.add_argument("-p", "--prio", help='FIFO priority')
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/linux/drivers/cpuidle/
H A Dcpuidle-pseries.c1 // 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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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/admin-guide/pm/
H A Dcpuidle.rst1 .. SPDX-License-Identifier: GPL-2.0
27 CPU idle time management is an energy-efficiency feature concerned about using
31 ------------
37 software as individual single-core processors. In other words, a CPU is an
46 Second, if the processor is multi-core, each core in it is able to follow at
61 Finally, each core in a multi-core processor may be able to follow more than one
66 multiple individual single-core "processors", referred to as *hardware threads*
67 (or hyper-threads specifically on Intel hardware), that each can follow one
78 ---------
107 next wakeup event, or there are strict latency constraints preventing any of the
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H A Dintel_idle.rst1 .. SPDX-License-Identifier: GPL-2.0
24 Documentation/admin-guide/pm/cpuidle.rst if you have not done that yet.]
28 processor's functional blocks into low-power states. That instruction takes two
38 only way to pass early-configuration-time parameters to it is via the kernel
42 .. _intel-idle-enumeration-of-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
56 subsystem (see :ref:`idle-states-representation` in
57 Documentation/admin-guide/pm/cpuidle.rst),
66 `below <intel-idle-parameters_>`_.]
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/linux/tools/power/cpupower/utils/
H A Dcpuidle-set.c1 // SPDX-License-Identifier: GPL-2.0
19 {"disable-by-latency", required_argument, NULL, 'D'},
20 {"enable-all", no_argument, NULL, 'E'},
30 unsigned long long latency = 0, state_latency; in cmd_idle_set() local
36 if (ret == -1) in cmd_idle_set()
46 param = -1; in cmd_idle_set()
54 exit(EXIT_FAILURE); in cmd_idle_set()
61 param = -1; in cmd_idle_set()
66 latency = strtoull(optarg, &endptr, 10); in cmd_idle_set()
68 printf(_("Bad latency value: %s\n"), optarg); in cmd_idle_set()
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/linux/tools/tracing/rtla/src/
H A Dtimerlat_top.c1 // 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_dat in timerlat_alloc_top()
162 timerlat_top_update(struct osnoise_tool * tool,int cpu,unsigned long long thread,unsigned long long latency) timerlat_top_update() argument
197 unsigned long long latency, thread; timerlat_top_handler() local
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H A Dtimerlat_hist.c1 // 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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H A Dtimerlat_aa.c1 // 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/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 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Daniel Lezcano <daniel.lezcano@linaro.org>
22 const: thermal-idle
24 A thermal-idle node describes the idle cooling device properties to
27 '#cooling-cells':
31 the cooling-maps reference. The first cell is the minimum cooling state
34 duration-us:
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/linux/tools/perf/tests/shell/
H A Dftrace.sh3 # SPDX-License-Identifier: GPL-2.0
5 set -e
8 if [ "$(id -u)" != 0 ]; then
10 exit 2
16 rm -f "${output}"
18 trap - EXIT TERM INT
23 exit 1
25 trap trap_cleanup EXIT TERM INT
32 perf ftrace -F > "${output}"
42 perf ftrace trace --graph-opts depth=5 sleep 0.1 > "${output}"
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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>
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
68 * Repeatable-interval-detector
69 * ----------------------------
79 * ---------------------------
80 * C states, especially those with large exit latencies, can have a real
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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/Documentation/devicetree/bindings/arm/
H A Dpsci.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
15 processors") can be used by Linux to initiate various CPU-centric power
25 r0 => 32-bit Function ID / return value
26 {r1 - r3} => Parameters
40 - description:
44 - description:
52 - const: arm,psci-0.2
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/linux/tools/testing/selftests/dma/
H A Ddma_map_benchmark.c1 // SPDX-License-Identifier: GPL-2.0-only
29 int threads = 1, seconds = 20, node = -1; in main()
37 while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) { in main()
61 return -1; in main()
66 fprintf(stderr, "invalid number of threads, must be in 1-%d\n", in main()
68 exit(1); in main()
72 fprintf(stderr, "invalid number of seconds, must be in 1-%d\n", in main()
74 exit(1); in main()
78 fprintf(stderr, "invalid transmit delay, must be in 0-%ld\n", in main()
80 exit(1); in main()
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/linux/tools/testing/selftests/ftrace/test.d/trigger/
H A Dtrigger-trace-marker-synthetic-kernel.tc2 # SPDX-License-Identifier: GPL-2.0
3 # description: trace_marker trigger - test histogram with synthetic event against kernel event
12 echo "Test histogram kernel event to trace_marker latency histogram trigger"
14 echo 'latency u64 lat' > synthetic_events
16 echo 'hist:keys=common_pid:lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_waking).latency($lat…
17 echo 'hist:keys=common_pid,lat:sort=lat' > events/synthetic/latency/trigger
24 grep 'hitcount: *1$' events/synthetic/latency/hist > /dev/null || \
27 exit 0
H A Dtrigger-trace-marker-synthetic.tc2 # SPDX-License-Identifier: GPL-2.0
3 # description: trace_marker trigger - test histogram with synthetic event
12 echo "Test histogram trace_marker to trace_marker latency histogram trigger"
14 echo 'latency u64 lat' > synthetic_events
16 echo 'hist:keys=common_pid:lat=common_timestamp.usecs-$ts0:onmatch(ftrace.print).latency($lat) if b…
17 echo 'hist:keys=common_pid,lat:sort=lat' > events/synthetic/latency/trigger
18 echo -n "start" > trace_marker
19 echo -n "end" > trace_marker
21 cnt=`grep 'hitcount: *1$' events/ftrace/print/hist | wc -l`
23 if [ $cnt -ne 2 ]; then
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/linux/tools/testing/selftests/drivers/net/netdevsim/
H A Dpsample.sh2 # SPDX-License-Identifier: GPL-2.0
32 rm -f $CAPTURE_FILE
48 if [ $(cat $CAPTURE_FILE | wc -l) -eq 0 ]; then
59 if [ $(cat $CAPTURE_FILE | wc -l) -ne 0 ]; then
74 grep -q -e "group 1234" $CAPTURE_FILE
81 grep -q -e "group 4321" $CAPTURE_FILE
87 grep -q -e "group 4321" $CAPTURE_FILE
105 grep -q -e "in-ifindex 1234" $CAPTURE_FILE
106 check_err $? "Sampled packets reported with wrong in-ifindex"
108 grep -q -e "out-ifindex 4321" $CAPTURE_FILE
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/linux/Documentation/trace/
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/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/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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/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/soc/qcom,rpmh-rsc.h>
16 interrupt-parent = <&intc>;
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