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/Documentation/devicetree/bindings/leds/
Dcommon.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jacek Anaszewski <jacek.anaszewski@gmail.com>
11 - Pavel Machek <pavel@ucw.cz>
25 led-sources:
30 $ref: /schemas/types.yaml#/definitions/uint32-array
35 from the header include/dt-bindings/leds/common.h. If there is no
42 the header include/dt-bindings/leds/common.h. If there is no matching
48 function-enumerator:
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Dleds-gpio.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/leds/leds-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jacek Anaszewski <jacek.anaszewski@gmail.com>
11 - Pavel Machek <pavel@ucw.cz>
14 Each LED is represented as a sub-node of the gpio-leds device. Each
19 const: gpio-leds
24 "(^led-[0-9a-f]$|led)":
33 retain-state-suspended:
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/Documentation/ABI/testing/
Dsysfs-block-device4 Contact: linux-ide@vger.kernel.org
6 (RW) Used by drivers which support software controlled activity
12 0 OFF - the LED is not activated on activity
13 1 BLINK_ON - the LED blinks on every 10ms when activity is
15 2 BLINK_OFF - the LED is on when idle, and blinks off
16 every 10ms when activity is detected.
20 control the activity LED via the em_message file.
26 Contact: linux-ide@vger.kernel.org
28 (RW) Hard disk shock protection
34 - If the device does not support the unload heads feature,
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/Documentation/admin-guide/pm/
Dsleep-states.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Sleep states are global low-power states of the entire system in which user
14 space code cannot be executed and the overall system activity is significantly
28 Suspend-to-Idle
29 ---------------
31 This is a generic, pure software, light-weight variant of system suspend (also
34 I/O devices into low-power states (possibly lower-power than available in the
38 The system is woken up from this state by in-band interrupts, so theoretically
43 or :ref:`suspend-to-RAM <s2ram>`, or it can be used in addition to any of the
50 -------
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/Documentation/admin-guide/
Diostats.rst6 more extensive disk statistics have been introduced to help measure disk
7 activity. Tools such as ``sar`` and ``iostat`` typically interpret these and do
44 each snapshot of your disk statistics.
56 or long-lived system; so applications should be prepared to deal with
58 int (32 bit) or unsigned long (32-bit or 64-bit, depending on your
59 machine) as noted per-field below. Unless your observations are very
63 system-wide stats you'll have to find all the devices and sum them all up.
65 Field 1 -- # of reads completed (unsigned long)
68 Field 2 -- # of reads merged, field 6 -- # of writes merged (unsigned long)
71 ultimately handed to the disk, and so it will be counted (and queued)
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Dmd.rst5 ---------------------------------
49 -1 linear mode
58 (raid-0 and raid-1 only)
78 --------------------------------------
87 that all auto-detected arrays are assembled as partitionable.
90 -------------------------------------------
102 mdadm --assemble --force ....
112 md-mod.start_dirty_degraded=1
116 ------------------
119 Currently, it supports superblock formats ``0.90.0`` and the ``md-1`` format
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Dcgroup-v2.rst1 .. _cgroup-v2:
11 conventions of cgroup v2. It describes all userland-visible aspects
14 v1 is available under :ref:`Documentation/admin-guide/cgroup-v1/index.rst <cgroup-v1>`.
19 1-1. Terminology
20 1-2. What is cgroup?
22 2-1. Mounting
23 2-2. Organizing Processes and Threads
24 2-2-1. Processes
25 2-2-2. Threads
26 2-3. [Un]populated Notification
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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/admin-guide/device-mapper/
Ddm-zoned.rst2 dm-zoned
5 The dm-zoned device mapper target exposes a zoned block device (ZBC and
7 pattern constraints. In effect, it implements a drive-managed zoned
10 host-managed zoned block devices and can mitigate the potential
11 device-side performance degradation due to excessive random writes on
12 host-aware zoned block devices.
21 http://www.t13.org/Documents/UploadedDocuments/docs2015/di537r05-Zoned_Device_ATA_Command_Set_ZAC.p…
23 The dm-zoned implementation is simple and minimizes system overhead (CPU
25 host-managed disk with 256 MB zones, dm-zoned memory usage per disk
29 dm-zoned target devices are formatted and checked using the dmzadm
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/Documentation/leds/
Dleds-class.rst8 of the LED (taking a value 0-max_brightness). Most LEDs don't have hardware
9 brightness support so will just be turned on for non-zero brightness settings.
14 existing subsystems with minimal additional code. Examples are the disk-activity,
15 nand-disk and sharpsl-charge triggers. With led triggers disabled, the code
48 - devicename:
57 - color:
59 include/dt-bindings/leds/common.h.
61 - function:
63 include/dt-bindings/leds/common.h.
66 to linux-leds@vger.kernel.org.
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/Documentation/admin-guide/laptops/
Dlaptop-mode.rst2 How to conserve battery power using laptop-mode
12 ------------
14 Laptop mode is used to minimize the time that the hard disk needs to be spun up,
31 ------------
41 located in /etc/default/laptop-mode on Debian-based systems, or in
42 /etc/sysconfig/laptop-mode on other systems.
52 -------
64 * If you mount some of your ext3/reiserfs filesystems with the -n option, then
67 wrong options -- or it will fail because it cannot write to /etc/mtab.
80 -----------
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Dasus-laptop.rst12 This driver provides support for extra features of ACPI-compatible ASUS laptops.
24 ------------
30 ------
35 - Fn key combinations
36 - Bluetooth enable and disable
37 - Wlan enable and disable
38 - GPS enable and disable
39 - Video output switching
40 - Ambient Light Sensor on and off
41 - LED control
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/Documentation/networking/device_drivers/ethernet/cirrus/
Dcs89x0.rst1 .. SPDX-License-Identifier: GPL-2.0
33 2.1 CS8900-based Adapter Configuration
34 2.2 CS8920-based Adapter Configuration
46 5.2.1 Diagnostic Self-Test
66 The CS8900-based ISA Ethernet Adapters from Cirrus Logic follow
67 IEEE 802.3 standards and support half or full-duplex operation in ISA bus
69 in 16-bit ISA or EISA bus expansion slots and are available in
70 10BaseT-only or 3-media configurations (10BaseT, 10Base2, and AUI for 10Base-5
73 CS8920-based adapters are similar to the CS8900-based adapter with additional
85 or loaded at run-time as a device driver module.
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/Documentation/admin-guide/sysctl/
Dvm.rst13 ------------------------------------------------------------------------------
20 the writeout of dirty data to disk.
27 - admin_reserve_kbytes
28 - compact_memory
29 - compaction_proactiveness
30 - compact_unevictable_allowed
31 - dirty_background_bytes
32 - dirty_background_ratio
33 - dirty_bytes
34 - dirty_expire_centisecs
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/Documentation/scsi/
Darcmsr_spec.rst11 ------------
13 - InitThread message and return code
15 2. Doorbell is used for RS-232 emulation
16 ----------------------------------------
35 ---------------------
46 4. RS-232 emulation
47 -------------------
52 1st uint32_t Data length (1--124)
53 Byte 4--127 Max 124 bytes of data
57 --------
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Dscsi_mid_low_api.rst1 .. SPDX-License-Identifier: GPL-2.0
4 SCSI mid_level - lower_level driver interface
14 (SCSI terminology, see SAM-3 at http://www.t10.org) sends SCSI commands
22 Examples are the usb-storage driver (found in the drivers/usb/storage
30 HBAs. These HBAs might be either on PCI daughter-boards or built into
33 has its own PCI device address. [The one-to-one correspondence between
49 documented in Documentation/scsi (e.g. aic7xxx.rst). The SCSI mid-level is
53 scsi-generic.rst (for the sg driver).
68 and OS-specific code (e.g. FreeBSD and Linux). Such drivers tend to have
147 ===-------------------=========--------------------===------
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/Documentation/networking/
Darcnet-hardware.rst1 .. SPDX-License-Identifier: GPL-2.0
11 2) This file is no longer Linux-specific. It should probably be moved out
17 e-mail apenwarr@worldvisions.ca with any settings for your particular card,
39 There are two "types" of ARCnet - STAR topology and BUS topology. This
46 well-designed standard. It uses something called "modified token passing"
47 which makes it completely incompatible with so-called "Token Ring" cards,
63 programming interface also means that when high-performance hardware
73 although they are generally kept down to the Ethernet-style 1500 bytes.
91 - Avery Pennraun <apenwarr@worldvisions.ca>
92 - Stephen A. Wood <saw@hallc1.cebaf.gov>
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/Documentation/arch/arm64/
Dbooting.rst13 (EL0 - EL3), with EL0, EL1 and EL2 having a secure and a non-secure
33 ---------------------------
46 -------------------------
50 The device tree blob (dtb) must be placed on an 8-byte boundary and must
59 ------------------------------
71 ------------------------
75 The decompressed kernel image contains a 64-byte header as follows::
91 - As of v3.17, all fields are little endian unless stated otherwise.
93 - code0/code1 are responsible for branching to stext.
95 - when booting through EFI, code0/code1 are initially skipped.
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/Documentation/admin-guide/cgroup-v1/
Dmemory.rst18 we call it "memory cgroup". When you see git-log and source code, you'll
30 Memory-hungry applications can be isolated and limited to a smaller
42 Current Status: linux-2.6.34-mmotm(development version of 2010/April)
46 - accounting anonymous pages, file caches, swap caches usage and limiting them.
47 - pages are linked to per-memcg LRU exclusively, and there is no global LRU.
48 - optionally, memory+swap usage can be accounted and limited.
49 - hierarchical accounting
50 - soft limit
51 - moving (recharging) account at moving a task is selectable.
52 - usage threshold notifier
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Dcgroups.rst6 Documentation/admin-guide/cgroup-v1/cpusets.rst
12 Portions Copyright (c) 2004-2006 Silicon Graphics, Inc.
42 ----------------------
56 schedules a resource or applies per-cgroup limits, but it may be
62 hierarchy, and a set of subsystems; each subsystem has system-specific
69 User-level code may create and destroy cgroups by name in an
79 access. For example, cpusets (see Documentation/admin-guide/cgroup-v1/cpusets.rst) allow
83 .. _cgroups-why-needed:
86 ----------------------------
89 Linux kernel, mainly for resource-tracking purposes. Such efforts
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/Documentation/driver-api/pm/
Ddevices.rst1 .. SPDX-License-Identifier: GPL-2.0
10 :Copyright: |copy| 2010-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
18 management (PM) code is also driver-specific. Most drivers will do very
22 This writeup gives an overview of how drivers interact with system-wide
25 background for the domain-specific work you'd do with any specific driver.
31 Drivers will use one or both of these models to put devices into low-power
36 Drivers can enter low-power states as part of entering system-wide
37 low-power states like "suspend" (also known as "suspend-to-RAM"), or
39 "suspend-to-disk").
42 by implementing various role-specific suspend and resume methods to
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/Documentation/filesystems/xfs/
Dxfs-online-fsck-design.rst1 .. SPDX-License-Identifier: GPL-2.0
8 Heading 3 uses "----"
25 - To help kernel distributors understand exactly what the XFS online fsck
28 - To help people reading the code to familiarize themselves with the relevant
31 - To help developers maintaining the system by capturing the reasons
59 - Provide a hierarchy of names through which application programs can associate
62 - Virtualize physical storage media across those names, and
64 - Retrieve the named data blobs at any time.
66 - Examine resource usage.
79 cross-references different types of metadata records with each other to look
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/Documentation/filesystems/
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/cdrom/
Dcdrom-standard.rst2 A Linux CD-ROM standard
14 Linux is probably the Unix-like operating system that supports
18 - The large list of hardware devices available for the many platforms
19 that Linux now supports (i.e., i386-PCs, Sparc Suns, etc.)
20 - The open design of the operating system, such that anybody can write a
22 - There is plenty of source code around as examples of how to write a driver.
29 This divergence of behavior has been very significant for CD-ROM
32 their drivers totally inconsistent, the writers of Linux CD-ROM
35 maintain uniform behavior across all the Linux CD-ROM drivers.
38 all the different CD-ROM device drivers for Linux. This document also
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