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/Documentation/devicetree/bindings/arm/
Darm,trace-buffer-extension.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
4 ---
5 $id: http://devicetree.org/schemas/arm/arm,trace-buffer-extension.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: ARM Trace Buffer Extensions
11 - Anshuman Khandual <anshuman.khandual@arm.com>
14 Arm Trace Buffer Extension (TRBE) is a per CPU component
15 for storing trace generated on the CPU to memory. It is
26 - const: arm,trace-buffer-extension
32 the arm,gic-v3 binding for details on describing a PPI partition.
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Darm,embedded-trace-extension.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
4 ---
5 $id: http://devicetree.org/schemas/arm/arm,embedded-trace-extension.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: ARM Embedded Trace Extensions
11 - Suzuki K Poulose <suzuki.poulose@arm.com>
12 - Mathieu Poirier <mathieu.poirier@linaro.org>
15 Arm Embedded Trace Extension(ETE) is a per CPU trace component that
18 The trace generated by the ETE could be stored via legacy CoreSight
19 components (e.g, TMC-ETR) or other means (e.g, using a per CPU buffer
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/Documentation/trace/coresight/
Dcoresight-trbe.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Trace Buffer Extension (TRBE).
11 --------------------
13 Trace Buffer Extension (TRBE) is a percpu hardware which captures in system
15 gets plugged in as a coresight sink device because the corresponding trace
23 ---------------------------
36 *Key file items are:-*
/Documentation/devicetree/bindings/perf/
Dspe-pmu.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/perf/spe-pmu.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: ARMv8.2 Statistical Profiling Extension (SPE) Performance Monitor Units (PMU)
10 - Will Deacon <will@kernel.org>
13 ARMv8.2 introduces the optional Statistical Profiling Extension for collecting
14 performance sample data using an in-memory trace buffer.
18 const: arm,statistical-profiling-extension-v1
24 supported on a subset of the CPUs, please consult the arm,gic-v3 binding
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/Documentation/trace/
Dhisi-ptt.rst1 .. SPDX-License-Identifier: GPL-2.0
4 HiSilicon PCIe Tune and Trace device
10 HiSilicon PCIe tune and trace device (PTT) is a PCIe Root Complex
13 and trace the TLP headers (trace). The two functions are independent,
23 +--------------Core 0-------+
25 | | [Root Port]---[Endpoint]
26 | | [Root Port]---[Endpoint]
27 | | [Root Port]---[Endpoint]
28 Root Complex |------Core 1-------+
30 | | [Root Port]---[ Switch ]---[Endpoint]
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Dhistogram.rst11 aggregate trace event data into histograms. For information on
12 trace events and event triggers, see Documentation/trace/events.rst.
19 aggregates event hits into a hash table keyed on one or more trace
21 derived from one or more trace event format fields and/or event
33 numeric fields - on an event hit, the value(s) will be added to a
35 in place of an explicit value field - this is simply a count of
45 useful for providing more fine-grained summaries of event data.
69 numeric fields are displayed as base-10 integers. This can be
76 .sym-offset display an address as a symbol and offset
83 .graph display a bar-graph of a value
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/Documentation/userspace-api/media/drivers/
Duvcvideo.rst1 .. SPDX-License-Identifier: GPL-2.0
6 This file documents some driver-specific aspects of the UVC driver, such as
7 driver-specific ioctls and implementation notes.
10 linux-media@vger.kernel.org.
13 Extension Unit (XU) support
14 ---------------------------
19 The UVC specification allows for vendor-specific extensions through extension
20 units (XUs). The Linux UVC driver supports extension unit controls (XU controls)
23 - through mappings of XU controls to V4L2 controls
24 - through a driver-specific ioctl interface
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/Documentation/mm/
Dpage_owner.rst17 to enlarge the trace buffer for preventing overlapping until userspace
18 program launched. And, launched program continually dump out the trace
19 buffer for later analysis and it would change system behaviour with more
50 stores information into the memory from struct page extension. This memory
57 more accurately. On 2GB memory x86-64 VM box, 13343 early allocated pages
59 page extension feature. Anyway, after that, no page is left in
60 un-tracking state.
65 1) Build user-space helper::
149 If you want to sort by the page nums of buf, use the ``-m`` parameter.
155 -a Sort by memory allocation time.
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/Documentation/filesystems/
Drelay.rst1 .. SPDX-License-Identifier: GPL-2.0
9 to userspace via user-defined 'relay channels'.
11 A 'relay channel' is a kernel->user data relay mechanism implemented
12 as a set of per-cpu kernel buffers ('channel buffers'), each
16 buffer. User space applications mmap() or read() from the relay files
24 buffer data. The relay interface doesn't implement any form of data
25 filtering - this also is left to the kernel client. The purpose is to
30 functions in the relay interface code - please see that for details.
35 Each relay channel has one buffer per CPU, each buffer has one or more
36 sub-buffers. Messages are written to the first sub-buffer until it is
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D9p.rst1 .. SPDX-License-Identifier: GPL-2.0
26 http://xcpu.org/papers/xcpu-talk.pdf
30 http://xcpu.org/papers/cellfs-talk.pdf
33 * VirtFS: A Virtualization Aware File System pass-through
34 https://kernel.org/doc/ols/2010/ols2010-pages-109-120.pdf
41 mount -t 9p 10.10.1.2 /mnt/9
45 mount -t 9p `namespace`/acme /mnt/9 -o trans=unix,uname=$USER
49 mount -t 9p -o trans=virtio <mount_tag> /mnt/9
61 mount -t 9p -o trans=usbg,aname=/path/to/fs <device> /mnt/9
89 Just start the 9pfs capable network server like diod/nfs-ganesha e.g.::
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Dproc.rst1 .. SPDX-License-Identifier: GPL-2.0
24 1.1 Process-Specific Subdirectories
36 3 Per-Process Parameters
37 3.1 /proc/<pid>/oom_adj & /proc/<pid>/oom_score_adj - Adjust the oom-killer
39 3.2 /proc/<pid>/oom_score - Display current oom-killer score
40 3.3 /proc/<pid>/io - Display the IO accounting fields
41 3.4 /proc/<pid>/coredump_filter - Core dump filtering settings
42 3.5 /proc/<pid>/mountinfo - Information about mounts
44 3.7 /proc/<pid>/task/<tid>/children - Information about task children
45 3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
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/Documentation/admin-guide/
Dkernel-parameters.txt16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nospcr -- disable console in ACPI SPCR table as
41 If set to vendor, prefer vendor-specific driver
73 Documentation/firmware-guide/acpi/debug.rst for more information about
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/Documentation/core-api/
Dprintk-formats.rst5 .. _printk-specifiers:
8 :Author: Andrew Murray <amurray@mpc-data.co.uk>
17 ------------------------------------------------------------
41 If <type> is architecture-dependent for its size (e.g., cycles_t, tcflag_t) or
72 --------------
78 Pointers printed without a specifier extension (i.e unadorned %p) are
80 has the added benefit of providing a unique identifier. On 64-bit machines
86 post-hoc. If not possible, and the aim of printing the address is to provide
97 --------------
101 %pe -ENOSPC
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/Documentation/sound/kernel-api/
Dwriting-an-alsa-driver.rst11 Architecture) <http://www.alsa-project.org/>`__ driver. The document
19 low-level driver implementation details. It only describes the standard
26 -------
56 --------------
60 sub-directories contain different modules and are dependent upon the
74 This directory and its sub-directories are for the ALSA sequencer. This
76 as snd-seq-midi, snd-seq-virmidi, etc. They are compiled only when
85 -----------------
88 to be exported to user-space, or included by several files in different
94 -----------------
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/Documentation/admin-guide/media/
Dbttv.rst1 .. SPDX-License-Identifier: GPL-2.0
8 ----------------------
12 ./scripts/config -e PCI
13 ./scripts/config -m I2C
14 ./scripts/config -m INPUT
15 ./scripts/config -m MEDIA_SUPPORT
16 ./scripts/config -e MEDIA_PCI_SUPPORT
17 ./scripts/config -e MEDIA_ANALOG_TV_SUPPORT
18 ./scripts/config -e MEDIA_DIGITAL_TV_SUPPORT
19 ./scripts/config -e MEDIA_RADIO_SUPPORT
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