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/openbmc/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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/openbmc/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 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Rafael J. Wysocki <rjw@rjwysocki.net>
11 - Kevin Hilman <khilman@kernel.org>
12 - Ulf Hansson <ulf.hansson@linaro.org>
24 \#power-domain-cells property in the PM domain provider node.
28 pattern: "^(power-controller|power-domain)([@-].*)?$"
30 domain-idle-states:
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/openbmc/linux/tools/tracing/rtla/src/
H A Dtimerlat_top.c1 // SPDX-License-Identifier: GPL-2.0
78 * timerlat_free_top - free runtime data
83 free(data->cpu_data); in timerlat_free_top()
88 * timerlat_alloc_histogram - alloc runtime data
99 data->nr_cpus = nr_cpus; in timerlat_alloc_top()
102 data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus); in timerlat_alloc_top()
103 if (!data->cpu_data) in timerlat_alloc_top()
108 data->cpu_data[cpu].min_irq = ~0; in timerlat_alloc_top()
109 data->cpu_data[cpu].min_thread = ~0; in timerlat_alloc_top()
110 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
86 * timerlat_free_histogram - free runtime data
94 for (cpu = 0; cpu < data->nr_cpus; cpu++) { in timerlat_free_histogram()
95 if (data->hist[cpu].irq) in timerlat_free_histogram()
96 free(data->hist[cpu].irq); in timerlat_free_histogram()
98 if (data->hist[cpu].thread) in timerlat_free_histogram()
99 free(data->hist[cpu].thread); in timerlat_free_histogram()
101 if (data->hist[cpu].user) in timerlat_free_histogram()
102 free(data->hist[cpu].user); in timerlat_free_histogram()
107 if (data->hist) in timerlat_free_histogram()
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/openbmc/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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/openbmc/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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/openbmc/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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/openbmc/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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/openbmc/linux/Documentation/devicetree/bindings/arm/msm/
H A Dqcom,idle-state.txt3 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 -
31 state. Retention may have a slightly higher latency than Standby.
44 code in the EL for the SoC. On SoCs with write-back L1 cache, the cache has to
50 be flushed, system bus, clocks - lowered, and SoC main XO clock gated and
52 power modes possible at this state is vast, the exit latency and the residency
58 The idle-state for QCOM SoCs are distinguished by the compatible property of
59 the idle-states device node.
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/openbmc/u-boot/arch/arm/dts/
H A Dfsl-imx8-ca53.dtsi17 #address-cells = <2>;
18 #size-cells = <0>;
20 idle-states {
21 entry-method = "psci";
23 CPU_SLEEP: cpu-sleep {
24 compatible = "arm,idle-state";
25 local-timer-stop;
26 arm,psci-suspend-param = <0x0000000>;
27 entry-latency-us = <700>;
28 exit-latency-us = <250>;
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/openbmc/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>
38 * 3) Latency tolerance (from pmqos infrastructure)
42 * -----------------------
43 * C state entry and exit have an energy cost, and a certain amount of time in
70 * Repeatable-interval-detector
71 * ----------------------------
81 * ---------------------------
82 * C states, especially those with large exit latencies, can have a real
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/openbmc/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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/openbmc/openbmc/poky/scripts/
H A Doe-time-dd-test.sh5 # SPDX-License-Identifier: MIT
7 # oe-time-dd-test records how much time it takes to
16 echo "$0 is used to detect i/o latency and runs commands to display host information."
18 echo "1) top -c -b -n1 -w 512"
19 echo "2) iostat -y -z -x 5 1"
20 echo "3) tail -30 tmp*/log/cooker/*/console-latest.log to gather cooker log."
23 …echo "-c | --count <amount> dd (transfer) <amount> KiB of data within specified timeout to detect…
24 echo " Must enable -t option."
25 echo "-t | --timeout <time> timeout in seconds for the <count> amount of data to be transferred."
26 echo "-l | --log-only run the commands without performing the data transfer."
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/openbmc/linux/tools/testing/selftests/ftrace/test.d/trigger/
H A Dtrigger-trace-marker-synthetic-kernel.tc2 # SPDX-License-Identifier: GPL-2.0
3 # description: trace_marker trigger - test histogram with synthetic event against kernel event
12 echo "Test histogram kernel event to trace_marker latency histogram trigger"
14 echo 'latency u64 lat' > synthetic_events
16 echo 'hist:keys=common_pid:lat=common_timestamp.usecs-$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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/openbmc/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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/openbmc/linux/arch/arm64/boot/dts/qcom/
H A Dsm4450.dtsi1 // SPDX-License-Identifier: BSD-3-Clause
6 #include <dt-bindings/gpio/gpio.h>
7 #include <dt-bindings/interrupt-controller/arm-gic.h>
10 interrupt-parent = <&intc>;
12 #address-cells = <2>;
13 #size-cells = <2>;
18 xo_board: xo-board {
19 compatible = "fixed-clock";
20 clock-frequency = <76800000>;
21 #clock-cells = <0>;
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/openbmc/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()
38 while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) { in main()
62 return -1; in main()
67 fprintf(stderr, "invalid number of threads, must be in 1-%d\n", in main()
69 exit(1); in main()
73 fprintf(stderr, "invalid number of seconds, must be in 1-%d\n", in main()
75 exit(1); in main()
79 fprintf(stderr, "invalid transmit delay, must be in 0-%ld\n", in main()
81 exit(1); in main()
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/openbmc/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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/openbmc/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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/openbmc/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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/openbmc/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
/openbmc/qemu/scripts/
H A Duserfaultfd-wrlat.py3 # userfaultfd-wrlat Summarize userfaultfd write fault latencies.
5 # run, while latency distribution histogram is
10 # USAGE: userfaultfd-lat [interval [count]]
18 # later. See the COPYING file in the top-level directory.
28 exit()
58 u64 delta = ts - (*tsp);
86 count = -1
94 except: # also catches -h, --help
104 print("Tracing UFFD-WP write fault latency... Hit Ctrl-C to end.")
113 exit()
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