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/linux-6.14.4/Documentation/trace/
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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/linux-6.14.4/tools/tracing/rtla/src/
Dosnoise_hist.c1 // SPDX-License-Identifier: GPL-2.0
31 int duration; member
68 * osnoise_free_histogram - free runtime data
76 for (cpu = 0; cpu < data->nr_cpus; cpu++) { in osnoise_free_histogram()
77 if (data->hist[cpu].samples) in osnoise_free_histogram()
78 free(data->hist[cpu].samples); in osnoise_free_histogram()
82 if (data->hist) in osnoise_free_histogram()
83 free(data->hist); in osnoise_free_histogram()
89 * osnoise_alloc_histogram - alloc runtime data
101 data->entries = entries; in osnoise_alloc_histogram()
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Dtimerlat_aa.c1 // SPDX-License-Identifier: GPL-2.0
25 * Per-cpu data statistics and data.
66 * If now - timestamp is <= latency, it might have influenced
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()
157 taa_data->tlat_irq_timstamp = record->ts; in timerlat_aa_irq_latency()
162 taa_data->thread_nmi_sum = 0; in timerlat_aa_irq_latency()
163 taa_data->thread_irq_sum = 0; in timerlat_aa_irq_latency()
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Dosnoise_top.c1 // SPDX-License-Identifier: GPL-2.0
38 int duration; member
73 * osnoise_free_top - free runtime data
78 free(data->cpu_data); in osnoise_free_top()
83 * osnoise_alloc_histogram - alloc runtime data
93 data->nr_cpus = nr_cpus; in osnoise_alloc_top()
96 data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus); in osnoise_alloc_top()
97 if (!data->cpu_data) in osnoise_alloc_top()
108 * osnoise_top_handler - this is the handler for osnoise tracer events
119 int cpu = record->cpu; in osnoise_top_handler()
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Dtimerlat_top.c1 // SPDX-License-Identifier: GPL-2.0
36 int duration; member
84 * timerlat_free_top - free runtime data
89 free(data->cpu_data); in timerlat_free_top()
94 * timerlat_alloc_histogram - alloc runtime data
105 data->nr_cpus = nr_cpus; in timerlat_alloc_top()
108 data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus); in timerlat_alloc_top()
109 if (!data->cpu_data) in timerlat_alloc_top()
114 data->cpu_data[cpu].min_irq = ~0; in timerlat_alloc_top()
115 data->cpu_data[cpu].min_thread = ~0; in timerlat_alloc_top()
[all …]
Dtimerlat_hist.c1 // SPDX-License-Identifier: GPL-2.0
35 int duration; member
91 * timerlat_free_histogram - free runtime data
99 for (cpu = 0; cpu < data->nr_cpus; cpu++) { in timerlat_free_histogram()
100 if (data->hist[cpu].irq) in timerlat_free_histogram()
101 free(data->hist[cpu].irq); in timerlat_free_histogram()
103 if (data->hist[cpu].thread) in timerlat_free_histogram()
104 free(data->hist[cpu].thread); in timerlat_free_histogram()
106 if (data->hist[cpu].user) in timerlat_free_histogram()
107 free(data->hist[cpu].user); in timerlat_free_histogram()
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/linux-6.14.4/drivers/media/rc/
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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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-6.14.4/tools/testing/selftests/rcutorture/bin/
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-6.14.4/Documentation/devicetree/bindings/thermal/
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 <[email protected]>
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-6.14.4/Documentation/devicetree/bindings/power/
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 <[email protected]>
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-6.14.4/drivers/net/fddi/skfp/
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-6.14.4/net/mac80211/
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-6.14.4/tools/power/cpupower/utils/
Dcpufreq-info.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * (C) 2004-2009 Dominik Brodowski <[email protected]>
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-6.14.4/drivers/thermal/
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-6.14.4/Documentation/tools/rtla/
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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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-6.14.4/Documentation/driver-api/thermal/
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
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/linux-6.14.4/tools/gpio/
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-6.14.4/drivers/gpu/drm/i915/gt/
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-6.14.4/Documentation/devicetree/bindings/watchdog/
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 <[email protected]>
11 - Guenter Roeck <linux@roeck-us.net>
12 - Wim Van Sebroeck <[email protected]>
16 const: zii,rave-wdt
22 reset-duration-ms:
24 Duration of the pulse generated when the watchdog times
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/linux-6.14.4/drivers/md/bcache/
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-6.14.4/drivers/cpuidle/governors/
Dmenu.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * menu.c - the menu idle governor
5 * Copyright (C) 2006-2007 Adam Belay <[email protected]>
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
56 * duration; if we expect 500 milliseconds of idle time the likelihood of
64 * indexed based on the magnitude of the expected duration as well as the
67 * Repeatable-interval-detector
68 * ----------------------------
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/linux-6.14.4/drivers/watchdog/
Daspeed_wdt.c1 // SPDX-License-Identifier: GPL-2.0-or-later
57 { .compatible = "aspeed,ast2400-wdt", .data = &ast2400_config },
58 { .compatible = "aspeed,ast2500-wdt", .data = &ast2500_config },
59 { .compatible = "aspeed,ast2600-wdt", .data = &ast2600_config },
89 * * Pulse duration
90 * * Drive mode: push-pull vs open-drain
93 * Pulse duration configuration is available on both the AST2400 and AST2500,
103 * and bit 30 represents push-pull or open-drain. With respect to write, magic
131 wdt->ctrl |= WDT_CTRL_ENABLE; in aspeed_wdt_enable()
133 writel(0, wdt->base + WDT_CTRL); in aspeed_wdt_enable()
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/linux-6.14.4/tools/tracing/rtla/tests/
Dhwnoise.t2 # SPDX-License-Identifier: GPL-2.0
9 "hwnoise --help"
11 "hwnoise -c 0 -T 1 -d 5s -q"
13 "hwnoise -a 5 -d 30s"
15 "hwnoise -P F:1 -c 0 -r 900000 -d 1M -q"
16 check "stop the trace if a single sample is higher than 1 us" \
17 "hwnoise -s 1 -T 1 -t -d 30s"
19 …"hwnoise -t -e osnoise:irq_noise trigger=\"hist:key=desc,duration:sort=desc,duration:vals=hitcount…

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