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/linux/Documentation/trace/
H A Dosnoise-tracer.rst5 In the context of high-performance computing (HPC), the Operating System
9 system. Moreover, hardware-related jobs can also cause noise, for example,
32 source of interferences, increasing a per-cpu interference counter. The
38 hardware-related noise. In this way, osnoise can account for any
44 -----
59 # _-----=> irqs-off
60 # / _----=> need-resched
61 # | / _---=> hardirq/softirq
62 # || / _--=> preempt-depth MAX
64 … |||| RUNTIME NOISE % OF CPU NOISE +-----------------------------+
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H A Dtimerlat-tracer.rst6 find sources of wakeup latencies of real-time threads. Like cyclictest,
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
38 <idle>-0 [001] dNh1 54.029346: #1 context irq timer_latency 2833 ns
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/linux/drivers/media/rc/
H A Dir-sharp-decoder.c1 // SPDX-License-Identifier: GPL-2.0-only
2 /* ir-sharp-decoder.c - handle Sharp IR Pulse/Space protocol
4 * Copyright (C) 2013-2014 Imagination Technologies Ltd.
12 #include "rc-core-priv.h"
15 #define SHARP_UNIT 40 /* us */
16 #define SHARP_BIT_PULSE (8 * SHARP_UNIT) /* 320us */
17 #define SHARP_BIT_0_PERIOD (25 * SHARP_UNIT) /* 1ms (680us space) */
18 #define SHARP_BIT_1_PERIOD (50 * SHARP_UNIT) /* 2ms (1680us space) */
19 #define SHARP_BIT_0_SPACE (17 * SHARP_UNIT) /* 680us space */
20 #define SHARP_BIT_1_SPACE (42 * SHARP_UNIT) /* 1680us space */
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H A Dir-xmp-decoder.c1 // SPDX-License-Identifier: GPL-2.0-only
2 /* ir-xmp-decoder.c - handle XMP IR Pulse/Space protocol
6 * - Based on info from http://www.hifi-remote.com
7 * - Ignore Toggle=9 frames
8 * - Ignore XMP-1 XMP-2 difference, always store 16 bit OBC
13 #include "rc-core-priv.h"
15 #define XMP_UNIT 136 /* us */
16 #define XMP_LEADER 210 /* us */
17 #define XMP_NIBBLE_PREFIX 760 /* us */
18 #define XMP_HALFFRAME_SPACE 13800 /* us */
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/linux/drivers/gpu/drm/xe/
H A DKconfig.profile1 # SPDX-License-Identifier: GPL-2.0-only
15 int "Default max timeslice duration (us)"
18 Configures the default max timeslice duration between multiple
21 int "Default min timeslice duration (us)"
24 Configures the default min timeslice duration between multiple
27 int "Preempt timeout (us, jiffy granularity)"
35 int "Default max preempt timeout (us)"
42 int "Default min preempt timeout (us)"
/linux/tools/testing/selftests/rcutorture/bin/
H A Dkvm-recheck-rcuscale-ftrace.sh2 # SPDX-License-Identifier: GPL-2.0+
6 # printed. Intended to be invoked from kvm-recheck-rcuscale.sh after
9 # Usage: kvm-recheck-rcuscale-ftrace.sh resdir
18 if test "`grep -c 'rcu_exp_grace_period.*start' < $i/console.log`" -lt 100
23 sed -e 's/^\[[^]]*]//' < $i/console.log |
24 grep 'us : rcu_exp_grace_period' |
25 sed -e 's/us : / : /' |
26 tr -d '\015' |
39 curgpdur = $3 - starttime;
44 print "Long GP " starttime "us to " $3 "us (" curgpdur "us)";
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/linux/tools/tracing/rtla/src/
H A Dtimerlat_aa.c1 // SPDX-License-Identifier: GPL-2.0
23 * Per-cpu data statistics and data.
64 * If now - timestamp is <= latency, it might have influenced
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()
155 taa_data->tlat_irq_timstamp = record->ts; in timerlat_aa_irq_latency()
160 taa_data->thread_nmi_sum = 0; in timerlat_aa_irq_latency()
161 taa_data->thread_irq_sum = 0; in timerlat_aa_irq_latency()
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H A Dosnoise_top.c1 // SPDX-License-Identifier: GPL-2.0
38 * osnoise_free_top - free runtime data
43 free(data->cpu_data); in osnoise_free_top()
48 * osnoise_alloc_histogram - alloc runtime data
58 data->nr_cpus = nr_cpus; in osnoise_alloc_top()
61 data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus); in osnoise_alloc_top()
62 if (!data->cpu_data) in osnoise_alloc_top()
73 * osnoise_top_handler - this is the handler for osnoise tracer events
84 int cpu = record->cpu; in osnoise_top_handler()
88 data = tool->data; in osnoise_top_handler()
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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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/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/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:
34 state. Note that, the exit-latency-us duration may be guaranteed only
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/linux/drivers/net/fddi/skfp/
H A Dhwt.c1 // SPDX-License-Identifier: GPL-2.0-or-later
20 * 28-Jun-1994 sw Edit v1.6.
21 * MCA: Added support for the SK-NET FDDI-FM2 adapter. The
33 /* 28-Jun-1994 sw - Note: hwt_restart() is also used in module 'drvfbi.c'. */
40 * Start hardware timer (clock ticks are 16us).
46 * smc - A pointer to the SMT Context structure.
48 * time - The time in units of 16us to load the timer with.
62 smc->hw.t_start = time ; in hwt_start()
63 smc->hw.t_stop = 0L ; in hwt_start()
67 * if time < 16 us in hwt_start()
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/linux/net/mac80211/
H A Dairtime.c1 // SPDX-License-Identifier: ISC
4 * Copyright (C) 2021-2022 Intel Corporation
16 /* Number of kilo-symbols (symbols * 1024) for a packet with (bps) bits per
17 * symbol. We use k-symbols to avoid rounding in the _TIME macros below.
26 ((ksyms) * 4 * 18) / 20 : /* 3.6 us per sym */ \
27 ((ksyms) * 4) /* 4.0 us per sym */ \
30 /* Transmit duration for the raw data part of an average sized packet */
42 /* Transmission time (1024 usec) for a packet containing (ksyms) * k-symbols */
45 ((ksyms) * 16 * 17) / 20 : /* 13.6 us per sym */ \
47 ((ksyms) * 16 * 18) / 20 : /* 14.4 us per sym */ \
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/linux/tools/power/cpupower/utils/
H A Dcpufreq-info.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
39 value[LINE_LEN - 1] = '\0'; in count_cpus()
40 if (strlen(value) < (LINE_LEN - 2)) in count_cpus()
64 printf(_(" minimum CPU frequency - maximum CPU frequency - governor\n")); in proc_cpufreq_output()
75 min_pctg = (policy->min * 100) / max; in proc_cpufreq_output()
76 max_pctg = (policy->max * 100) / max; in proc_cpufreq_output()
78 printf("CPU%3d %9lu kHz (%3d %%) - %9lu kHz (%3d %%) - %s\n", in proc_cpufreq_output()
79 cpu , policy->min, max ? min_pctg : 0, policy->max, in proc_cpufreq_output()
80 max ? max_pctg : 0, policy->governor); in proc_cpufreq_output()
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/linux/drivers/thermal/
H A Dcpuidle_cooling.c1 // SPDX-License-Identifier: GPL-2.0
21 * struct cpuidle_cooling_device - data for the idle cooling device
31 * cpuidle_cooling_runtime - Running time computation
35 * The running duration is computed from the idle injection duration
37 * means the running duration is zero. If we have a 50% ratio
38 * injection, that means we have equal duration for idle and for
39 * running duration.
43 * running = idle x ((100 / ratio) - 1)
47 * running = (idle x 100) / ratio - idle
49 * For example, if we have an injected duration of 50%, then we end up
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/linux/Documentation/tools/rtla/
H A Dcommon_options.rst1 **-c**, **--cpus** *cpu-list*
3 Set the osnoise tracer to run the sample threads in the cpu-list.
5 **-H**, **--house-keeping** *cpu-list*
7 Run rtla control threads only on the given cpu-list.
9 **-d**, **--duration** *time[s|m|h|d]*
11 Set the duration of the session.
13 **-D**, **--debug**
17 **-e**, **--event** *sys:event*
19 …-t**) session. The argument can be a specific event, e.g., **-e** *sched:sched_switch*, or all eve…
21 **--filter** *<filter>*
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H A Drtla-hwnoise.rst1 .. SPDX-License-Identifier: GPL-2.0
4 rtla-hwnoise
6 ------------------------------------------
7 Detect and quantify hardware-related noise
8 ------------------------------------------
22 of threads as a consequence, only non-maskable interrupts and hardware-related
38 In the example below, the **rtla hwnoise** tool is set to run on CPUs *1-7*
39 on a system with 8 cores/16 threads with hyper-threading enabled.
45 # rtla hwnoise -c 1-7 -T 1 -d 10m -q
46 Hardware-related Noise
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/linux/Documentation/driver-api/thermal/
H A Dcpu-idle-cooling.rst1 .. SPDX-License-Identifier: GPL-2.0
8 ----------
26 budget lower than the requested one and under-utilize the CPU, thus
27 losing performance. In other words, one OPP under-utilizes the CPU
33 ----------
36 duration in a controlled period, the SoC temperature will
37 decrease. Acting on the idle state duration or the idle cycle
48 belong to the same cluster, with a duration greater than the cluster
58 ---------------
69 We use a fixed duration of idle injection that gives an acceptable
[all …]
/linux/tools/gpio/
H A Dgpio-sloppy-logic-analyzer.sh1 #!/bin/sh -eu
2 # SPDX-License-Identifier: GPL-2.0
6 # Copyright (C) Wolfram Sang <wsa@sang-engineering.com>
14 ladirname='gpio-sloppy-logic-analyzer'
18 duration=
29 $progname - helper script for the Linux Kernel Sloppy GPIO Logic Analyzer
31 -c|--cpu <n>: which CPU to isolate for sampling. Only needed once. Default <1>.
34 -d|--duration-us <SI-n>: number of microseconds to sample. Overrides -n, no default value.
35 -h|--help: print this help
36 -i|--instance <str>: name of the logic analyzer in case you have multiple instances. Default
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/linux/drivers/gpu/drm/i915/gt/
H A Dintel_engine_pm.c1 // SPDX-License-Identifier: MIT
22 struct drm_i915_private *i915 = engine->i915; in intel_gsc_idle_msg_enable()
24 if (MEDIA_VER(i915) >= 13 && engine->id == GSC0) { in intel_gsc_idle_msg_enable()
25 intel_uncore_write(engine->gt->uncore, in intel_gsc_idle_msg_enable()
28 /* hysteresis 0xA=5us as recommended in spec*/ in intel_gsc_idle_msg_enable()
29 intel_uncore_write(engine->gt->uncore, in intel_gsc_idle_msg_enable()
40 if (ce->state) { in dbg_poison_ce()
41 struct drm_i915_gem_object *obj = ce->state->obj; in dbg_poison_ce()
42 int type = intel_gt_coherent_map_type(ce->engine->gt, obj, true); in dbg_poison_ce()
50 memset(map, CONTEXT_REDZONE, obj->base.size); in dbg_poison_ce()
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/linux/Documentation/devicetree/bindings/watchdog/
H A Dzii,rave-wdt.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/watchdog/zii,rave-wdt.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Martyn Welch <martyn.welch@collabora.co.uk>
11 - Guenter Roeck <linux@roeck-us.net>
12 - Wim Van Sebroeck <wim@iguana.be>
16 const: zii,rave-wdt
22 reset-duration-ms:
24 Duration of the pulse generated when the watchdog times
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/linux/drivers/md/bcache/
H A Dutil.c1 // SPDX-License-Identifier: GPL-2.0
32 return -EINVAL; \
55 return -EINVAL; \
64 return -EINVAL; \
66 while (u--) { \
69 return -EINVAL; \
71 (i < 0 && -ANYSINT_MAX(type) / 1024 > i)) \
72 return -EINVAL; \
86 * bch_hprint - formats @v to human readable string for sysfs. in STRTO_H()
100 q = -v; in STRTO_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>
39 * -----------------------
42 * provides us this duration in the "target_residency" field. So all that we
50 * duration always was 50% of the next timer tick, the correction factor will
55 * ratio is dependent on the order of magnitude of the expected duration; if we
59 * indexed based on the magnitude of the expected duration.
61 * Repeatable-interval-detector
62 * ----------------------------
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/linux/tools/tracing/rtla/tests/
H A Dhwnoise.t2 # SPDX-License-Identifier: GPL-2.0
9 "hwnoise --help" 0 "summary of hardware-related noise"
11 "hwnoise -c 0 -T 1 -d 5s -q" 0
13 "hwnoise -a 5 -d 10s" 2 "osnoise hit stop tracing"
15 "hwnoise -P F:1 -c 0 -r 900000 -d 10s -q"
16 check "stop the trace if a single sample is higher than 1 us" \
17 "hwnoise -s 1 -T 1 -t -d 10s" 2 "Saving trace to osnoise_trace.txt"
19 …"hwnoise -t -e osnoise:irq_noise --trigger=\"hist:key=desc,duration:sort=desc,duration:vals=hitcou…
/linux/drivers/media/platform/st/sti/hva/
H A Dhva-debugfs.c1 // SPDX-License-Identifier: GPL-2.0
11 #include "hva-hw.h"
15 struct hva_streaminfo *stream = &ctx->streaminfo; in format_ctx()
16 struct hva_frameinfo *frame = &ctx->frameinfo; in format_ctx()
17 struct hva_controls *ctrls = &ctx->ctrls; in format_ctx()
18 struct hva_ctx_dbg *dbg = &ctx->dbg; in format_ctx()
21 seq_printf(s, "|-%s\n |\n", ctx->name); in format_ctx()
23 seq_printf(s, " |-[%sframe info]\n", in format_ctx()
24 ctx->flags & HVA_FLAG_FRAMEINFO ? "" : "default "); in format_ctx()
25 seq_printf(s, " | |- pixel format=%4.4s\n" in format_ctx()
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