| /linux-6.15/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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| /linux-6.15/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-6.15/tools/tracing/rtla/sample/ |
| D | timerlat_load.py | 2 # 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", type=int, help='FIFO priority')
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| /linux-6.15/drivers/cpuidle/ |
| D | cpuidle-pseries.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * cpuidle-pseries - idle state cpuidle driver.
48 dev->poll_time_limit = false; in snooze_loop()
59 dev->poll_time_limit = true; in snooze_loop()
81 * were soft-disabled in check_and_cede_processor()
95 * "ibm,get-systems-parameter" RTAS call with the token
101 * table with all the parameters to ibm,get-system-parameters.
102 * CEDE_LATENCY_TOKEN corresponds to the token value for Cede Latency
108 * If the platform supports the cede latency settings information system
112 * a. The first byte is the length “N” of each cede latency setting record minus
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| 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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| /linux-6.15/tools/power/cpupower/utils/ |
| D | cpuidle-set.c | 1 // 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-6.15/tools/perf/tests/shell/ |
| D | ftrace.sh | 3 # 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-6.15/tools/tracing/rtla/src/ |
| D | timerlat_top.c | 1 // 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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| D | timerlat_hist.c | 1 // 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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| /linux-6.15/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-6.15/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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| /linux-6.15/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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| /linux-6.15/Documentation/admin-guide/pm/ |
| D | cpuidle.rst | 1 .. 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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| D | intel_idle.rst | 1 .. 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-6.15/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-6.15/Documentation/devicetree/bindings/arm/ |
| D | psci.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
15 processors") can be used by Linux to initiate various CPU-centric power
25 r0 => 32-bit Function ID / return value
26 {r1 - r3} => Parameters
40 - description:
44 - description:
52 - const: arm,psci-0.2
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| /linux-6.15/tools/testing/selftests/ftrace/test.d/trigger/ |
| D | trigger-trace-marker-synthetic-kernel.tc | 2 # SPDX-License-Identifier: GPL-2.0
3 # description: trace_marker trigger - test histogram with synthetic event against kernel event
12 echo "Test histogram kernel event to trace_marker latency histogram trigger"
14 echo 'latency u64 lat' > synthetic_events
16 echo 'hist:keys=common_pid:lat=common_timestamp.usecs-$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
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| D | trigger-trace-marker-synthetic.tc | 2 # 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-6.15/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-6.15/tools/testing/selftests/drivers/net/netdevsim/ |
| D | psample.sh | 2 # 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" $CAPTURE_FILE
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| /linux-6.15/drivers/cpuidle/governors/ |
| D | menu.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * menu.c - the menu idle governor
5 * Copyright (C) 2006-2007 Adam Belay <abelay@novell.com>
35 * 2) Latency tolerance (from pmqos infrastructure)
39 * -----------------------
40 * C state entry and exit have an energy cost, and a certain amount of time in
61 * Repeatable-interval-detector
62 * ----------------------------
110 s64 value, min_thresh = -1, max_thresh = UINT_MAX; in get_typical_interval()
123 value = data->intervals[i]; in get_typical_interval()
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| /linux-6.15/tools/perf/tests/shell/base_report/ |
| D | setup.sh | 2 # perftool-testsuite :: perf_report
3 # SPDX-License-Identifier: GPL-2.0
11 # We need some sample data for perf-report testing
20 test -d "$HEADER_TAR_DIR" || mkdir -p "$HEADER_TAR_DIR"
22 SW_EVENT="cpu-clock"
24 $CMD_PERF record -asdg -e $SW_EVENT -o $CURRENT_TEST_DIR/perf.data -- $CMD_LONGER_SLEEP 2> $LOGS_DI…
34 …d --latency -o $CURRENT_TEST_DIR/perf.data.1 bash -c "for i in {1..100} ; do cat /proc/cpuinfo 1> …
38 cat $LOGS_DIR/setup-latency.log
41 …mon/check_all_patterns_found.pl "$RE_LINE_RECORD1" "$RE_LINE_RECORD2" < $LOGS_DIR/setup-latency.log
48 exit $?
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| /linux-6.15/Documentation/trace/ |
| D | timerlat-tracer.rst | 6 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-6.15/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
|