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/linux/tools/lib/perf/Documentation/
H A Dlibperf-sampling.txt1 libperf-sampling(7)
6 libperf-sampling - sampling interface
11 The sampling interface provides API to measure and get count for specific perf events.
13 The following test tries to explain count on `sampling.c` example.
15 It is by no means complete guide to sampling, but shows libperf basic API for sampling.
17 The `sampling.c` comes with libperf package and can be compiled and run like:
21 $ gcc -o sampling sampling.c -lperf
22 $ sudo ./sampling
36 The `sampling.c` example profiles/samples all CPUs with hardware cycles, in a
158 From this moment the cycles event is sampling.
/linux/drivers/media/pci/cx88/
H A Dcx88-input.c36 u32 sampling; member
199 if (ir->sampling) { in __cx88_ir_start()
216 if (ir->sampling) { in __cx88_ir_stop()
291 ir->sampling = 0xeb04; /* address */ in cx88_ir_init()
305 ir->sampling = 1; in cx88_ir_init()
397 ir->sampling = 0xff00; /* address */ in cx88_ir_init()
403 ir->sampling = 0xff00; /* address */ in cx88_ir_init()
407 ir->sampling = 0xff00; /* address */ in cx88_ir_init()
424 ir->sampling = 1; in cx88_ir_init()
434 ir->sampling = 0xff00; /* address */ in cx88_ir_init()
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/linux/net/psample/
H A DKconfig3 # psample packet sampling configuration
7 tristate "Packet-sampling netlink channel"
10 Say Y here to add support for packet-sampling netlink channel
/linux/tools/perf/Documentation/
H A Dperf-amd-ibs.txt19 Op and IBS Fetch. IBS Op sampling provides information about instruction
22 behavior etc. IBS Fetch sampling provides information about instruction fetch
64 System-wide profile, cycles event, sampling period: 100000
68 Per-cpu profile (cpu10), cycles event, sampling period: 100000
72 Per-cpu profile (cpu10), cycles event, sampling freq: 1000
76 System-wide profile, uOps event, sampling period: 100000
84 System-wide profile, uOps event, sampling period: 100000, L3MissOnly (Zen4 onward)
88 Per process(upstream v6.2 onward), uOps event, sampling period: 100000
92 Per process(upstream v6.2 onward), uOps event, sampling period: 100000
140 System-wide profile, fetch ops event, sampling period: 100000
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H A Dperf-arm-spe.txt21 The sampling has 5 stages:
36 perturbation is also added to the sampling interval by default.
67 recording. These samples are the same as if normal sampling was done by Perf without using SPE,
98 The effect of microarchitectural sampling
101 If an implementation samples micro-operations instead of instructions, the results of sampling must
107 The coarse effect of conversions, and, if applicable, sampling of speculative operations, can be
146 jitter=1 - use jitter to avoid resonance when sampling (PMSIRR.RND)
154 +++*+++ Latency is the total latency from the point at which sampling started on that instruction, rather
217 assigning PIDs to kernel samples. For userspace sampling this can be ignored.
221 Increase sampling interva
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/linux/Documentation/devicetree/bindings/staging/iio/adc/
H A Dspear-adc.txt7 - sampling-frequency: Default sampling frequency
22 sampling-frequency = <5000000>;
/linux/Documentation/ABI/testing/
H A Dsysfs-bus-iio-adc-ad413016 * "sinc3+rej60" - Sinc3 + 60Hz rejection. At a sampling
21 time. Best used with a sampling frequency of at least
44 If the current sampling frequency is out of range for the new
45 filter mode, the sampling frequency will be changed to the
H A Ddebugfs-intel-iommu162 to enable sampling.
166 * 0 - disable sampling all latency data
168 * 1 - enable sampling IOTLB invalidation latency data
170 * 2 - enable sampling devTLB invalidation latency data
172 * 3 - enable sampling intr entry cache invalidation latency data
175 a snapshot of sampling result of all enabled monitors.
181 1) Disable sampling all latency data:
185 2) Enable sampling IOTLB invalidation latency data
207 3) Enable sampling devTLB invalidation latency data
H A Dconfigfs-usb-gadget-uac19 c_srate list of capture sampling rates (comma-separated)
20 p_srate list of playback sampling rates (comma-separated)
H A Dconfigfs-usb-gadget-uac29 c_srate list of capture sampling rates (comma-separated)
24 p_srate list of playback sampling rates (comma-separated)
/linux/Documentation/admin-guide/hw-vuln/
H A Dindex.rst17 special-register-buffer-data-sampling
24 reg-file-data-sampling
/linux/tools/perf/tests/attr/
H A Dtest-record-group-sampling32 # inherit is disabled for group sampling
35 # sampling disabled
/linux/Documentation/sound/cards/
H A Dmaya44.rst29 - playback and capture at all sampling rates
95 The Maya44 card (or more exactly, the Wolfson WM8776 codecs) allow a maximum sampling rate of 192 k…
97 As the ICE1724 chip only allows one global sampling rate, this is handled as follows:
99 * setting the sampling rate on any open PCM device on the maya44 card will always set the *global* …
106 …ditional code for limiting the sampling rate when setting on a capture pcm device. However because…
/linux/arch/mips/kernel/
H A Dentry.S49 # between sampling and return
86 # sampling and return
130 # sampling and return
/linux/kernel/trace/
H A Dtrace_osnoise.c205 * one sampling thread.
209 bool sampling; member
349 u64 sample_period; /* total sampling period */
350 u64 sample_runtime; /* active sampling portion of period */
888 if (!osn_var->sampling) in trace_osnoise_callback()
927 if (!osn_var->sampling) in osnoise_trace_irq_entry()
951 if (!osn_var->sampling) in osnoise_trace_irq_exit()
1058 if (!osn_var->sampling) in trace_softirq_entry_callback()
1082 if (!osn_var->sampling) in trace_softirq_exit_callback()
1154 if (!osn_var->sampling) in thread_entry()
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/linux/tools/power/cpupower/bench/
H A DREADME-BENCH74 sampling rate you get:
79 In round 2, if the ondemand sampling times exactly match the load/sleep
91 |-----|-----|-----|-----|-----|-----|-----|---- ondemand sampling (1)
93 |-----|-----|-----|-----|-----|-----|-----|-- ondemand sampling (2)
/linux/Documentation/devicetree/bindings/mmc/
H A Dcavium-mmc.txt22 - cavium,cmd-clk-skew : number of coprocessor clocks before sampling command
23 - cavium,dat-clk-skew : number of coprocessor clocks before sampling data
/linux/tools/testing/selftests/powerpc/pmu/
H A Devent.c25 int type, char *name, bool sampling) in __event_init_opts() argument
37 if (sampling) { in __event_init_opts()
/linux/Documentation/arch/powerpc/
H A Dimc.rst100 to be monitored and the sampling duration. On each overflow in the CPMCxSEL,
145 CPMC_LOAD contains the sampling duration. SAMPSEL and CPMCxSEL determines the
148 memory and reloads the CMPC_LOAD value for the next sampling duration. IMC
178 also provide a way for the operating system to do instruction sampling in real
/linux/Documentation/userspace-api/media/v4l/
H A Ddev-sdr.rst46 ADC/DAC sampling rate (sampling frequency) and the possible radio
63 capture and output format. Both the sampling resolution and the data
/linux/tools/lib/thermal/
H A DBuild4 libthermal-y += sampling.o
/linux/Documentation/dev-tools/
H A Dgpio-sloppy-logic-analyzer.rst70 parameter. The bus speed is 400kHz. So, the sampling theorem says we need to
72 start condition happen faster, so we need a higher sampling frequency, e.g.
82 still sampling in the background. Unless this has finished, you will not find a
/linux/tools/gpio/
H A Dgpio-sloppy-logic-analyzer.sh31 -c|--cpu <n>: which CPU to isolate for sampling. Only needed once. Default <1>.
32 Remember that a more powerful CPU gives you higher sampling speeds.
42 -s|--sample_freq <SI-n>: desired sampling frequency. Might be capped if too large.
/linux/Documentation/driver-api/media/drivers/
H A Dcx88-devel.rst78 - Setup 4KHz sampling rate (roughly 2x oversampled; good enough for our RC5
81 - enable sampling
/linux/Documentation/devicetree/bindings/phy/
H A Dapm-xgene-phy.txt23 data earlier than the nominal sampling point. 1 means
24 sample data later than the nominal sampling point.

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