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/Documentation/devicetree/bindings/pps/
Dpps-gpio.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/pps/pps-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Fabio Estevam <festevam@gmail.com>
14 const: pps-gpio
20 echo-gpios:
21 description: The GPIO that provides the PPS ECHO signal.
24 echo-active-ms:
25 description: Duration in ms of the active portion of the echo pulse.
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/Documentation/hwmon/
Dds1621.rst47 - Christian W. Zuckschwerdt <zany@triq.net>
48 - valuable contributions by Jan M. Sendler <sendler@sendler.de>
49 - ported to 2.6 by Aurelien Jarno <aurelien@aurel32.net>
53 ------------------
58 * 0 = active high,
59 * 1 = active low
62 -----------
66 programmed into non-volatile on-chip registers). Temperature range is -55
68 Fahrenheit range of -67 to +257 degrees with 0.9 steps. If polarity
75 ("cooler"), vice versa. That way "heater" equals "active low", whereas
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/Documentation/devicetree/bindings/leds/
Dleds-trigger-pattern.txt3 The pattern is given by a series of tuples, of brightness and duration (ms).
6 new value, and writing malformed pattern deactivates any active one.
9 the tuple with duration less than dimming interval (50ms) is treated as a step
17 echo 0 1000 255 2000 > pattern
19 It will make the LED go gradually from zero-intensity to max (255) intensity in
24 255-| / \ / \ /
28 0-| / \/ \/
29 +---0----1----2----3----4----5----6------------> time (s)
32 use zero-time lengths (the brightness must be same as the previous tuple's). So
37 echo 0 1000 0 0 255 2000 255 0 > pattern
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/Documentation/core-api/irq/
Dirq-affinity.rst6 - Started by Ingo Molnar <mingo@redhat.com>
7 - Update by Max Krasnyansky <maxk@qualcomm.com>
17 to all non-active IRQs. Once IRQ is allocated/activated its affinity bitmask
21 Here is an example of restricting IRQ44 (eth1) to CPU0-3 then restricting
22 it to CPU4-7 (this is an 8-CPU SMP box)::
28 [root@moon 44]# echo 0f > smp_affinity
31 [root@moon 44]# ping -f h
34 --- hell ping statistics ---
36 round-trip min/avg/max = 0.1/0.1/0.4 ms
39 … 1785 1785 1783 0 0 0 0 IO-APIC-level eth1
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/Documentation/scheduler/
Dsched-deadline.rst12 3. Scheduling Real-Time Tasks
18 4.1 System-wide settings
33 system behavior. As for -rt (group) scheduling, it is assumed that root users
50 ------------------
70 with the "traditional" real-time task model (see Section 3) can effectively
76 - Each SCHED_DEADLINE task is characterized by the "runtime",
79 - The state of the task is described by a "scheduling deadline", and
82 - When a SCHED_DEADLINE task wakes up (becomes ready for execution),
86 ---------------------------------- > ---------
87 scheduling deadline - current time period
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/Documentation/networking/
Dbonding.rst1 .. SPDX-License-Identifier: GPL-2.0
11 Corrections, HA extensions: 2000/10/03-15:
13 - Willy Tarreau <willy at meta-x.org>
14 - Constantine Gavrilov <const-g at xpert.com>
15 - Chad N. Tindel <ctindel at ieee dot org>
16 - Janice Girouard <girouard at us dot ibm dot com>
17 - Jay Vosburgh <fubar at us dot ibm dot com>
22 - Mitch Williams <mitch.a.williams at intel.com>
35 the original tools from extreme-linux and beowulf sites will not work
119 -----------------------------------------------
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Dcan.rst2 SocketCAN - Controller Area Network
20 .. _socketcan-motivation:
29 functionality. Usually, there is only a hardware-specific device
32 Queueing of frames and higher-level transport protocols like ISO-TP
34 character-device implementations support only one single process to
47 protocol family module and also vice-versa. Also, the protocol family
57 communicate using a specific transport protocol, e.g. ISO-TP, just
60 CAN-IDs, frames, etc.
62 Similar functionality visible from user-space could be provided by a
74 * **Abstraction:** In most existing character-device implementations, the
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Dip-sysctl.rst1 .. SPDX-License-Identifier: GPL-2.0
10 ip_forward - BOOLEAN
11 - 0 - disabled (default)
12 - not 0 - enabled
20 ip_default_ttl - INTEGER
25 ip_no_pmtu_disc - INTEGER
27 fragmentation-required ICMP is received, the PMTU to this
38 accept fragmentation-needed errors if the underlying protocol
48 Possible values: 0-3
52 min_pmtu - INTEGER
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/Documentation/admin-guide/mm/damon/
Dlru_sort.rst1 .. SPDX-License-Identifier: GPL-2.0
4 DAMON-based LRU-lists Sorting
7 DAMON-based LRU-lists Sorting (DAMON_LRU_SORT) is a static kernel module that
9 (de)prioritization of pages on their LRU-lists for making LRU-lists a more
12 Where Proactive LRU-lists Sorting is Required?
15 As page-granularity access checking overhead could be significant on huge
23 Because DAMON can identify access patterns of best-effort accuracy while
24 inducing only user-specified range of overhead, proactively running
32 rates that higher than a user-specified threshold) and cold pages (pages of
34 user-specified threshold) using DAMON, and prioritizes hot pages while
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Dreclaim.rst1 .. SPDX-License-Identifier: GPL-2.0
4 DAMON-based Reclamation
7 DAMON-based Reclamation (DAMON_RECLAIM) is a static kernel module that aimed to
9 It doesn't aim to replace the LRU-list based page_granularity reclamation, but
15 On general memory over-committed systems, proactively reclaiming cold pages
20 Free Pages Reporting [3]_ based memory over-commit virtualization systems are
24 guests could be not so memory-frugal, mainly because some kernel subsystems and
25 user-space applications are designed to use as much memory as available. Then,
54 -------
60 no real monitoring and reclamation due to the watermarks-based activation
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/Documentation/admin-guide/mm/
Dmultigen_lru.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Multi-Gen LRU
6 The multi-gen LRU is an alternative LRU implementation that optimizes
26 -----------
38 0x0001 The main switch for the multi-gen LRU.
42 disabled, the multi-gen LRU will suffer a minor performance
46 0x0004 Clearing the accessed bit in non-leaf page table entries as
49 disabled, the multi-gen LRU will suffer a negligible
57 echo y >/sys/kernel/mm/lru_gen/enabled
60 echo 5 >/sys/kernel/mm/lru_gen/enabled
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/Documentation/admin-guide/pm/
Dintel_pstate.rst1 .. SPDX-License-Identifier: GPL-2.0
22 Documentation/admin-guide/pm/cpufreq.rst if you have not done that yet.]
24 For the processors supported by ``intel_pstate``, the P-state concept is broader
27 information about that). For this reason, the representation of P-states used
32 ``intel_pstate`` maps its internal representation of P-states to frequencies too
38 Since the hardware P-state selection interface used by ``intel_pstate`` is
43 time the corresponding CPU is taken offline and need to be re-initialized when
47 only way to pass early-configuration-time parameters to it is via the kernel
57 ``intel_pstate`` can operate in two different modes, active or passive. In the
58 active mode, it uses its own internal performance scaling governor algorithm or
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Dcpufreq.rst1 .. SPDX-License-Identifier: GPL-2.0
20 Operating Performance Points or P-states (in ACPI terminology). As a rule,
24 time (or the more power is drawn) by the CPU in the given P-state. Therefore
29 as possible and then there is no reason to use any P-states different from the
30 highest one (i.e. the highest-performance frequency/voltage configuration
38 put into different P-states.
41 capacity, so as to decide which P-states to put the CPUs into. Of course, since
64 information on the available P-states (or P-state ranges in some cases) and
65 access platform-specific hardware interfaces to change CPU P-states as requested
70 performance scaling algorithms for P-state selection can be represented in a
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/Documentation/networking/device_drivers/hamradio/
Dz8530drv.rst1 .. SPDX-License-Identifier: GPL-2.0
5 SCC.C - Linux driver for Z8530 based HDLC cards for AX.25
14 1. ftp://ftp.ccac.rwth-aachen.de/pub/jr/z8530drv-utils_3.0-3.tar.gz
16 2. ftp://ftp.pspt.fi/pub/ham/linux/ax25/z8530drv-utils_3.0-3.tar.gz
41 AX.25-HOWTO on how to emulate a KISS TNC on network device drivers.
54 please read 'man insmod' that comes with module-init-tools.
64 of your rc.*-files. This has to be done BEFORE you can
92 - this is just a delimiter to make sccinit a bit simpler to
96 - the address of the data port A of this Z8530 (needed)
98 - the address of the control port A (needed)
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/Documentation/ABI/testing/
Dsysfs-bus-usb10 This allows to avoid side-effects with drivers
28 drivers, non-authorized one are not. By default, wired
33 Contact: linux-usb@vger.kernel.org
48 # echo "8086 10f5" > /sys/bus/usb/drivers/foo/new_id
53 # echo "0458 7045 0 0458 704c" > /sys/bus/usb/drivers/foo/new_id
67 What: /sys/bus/usb-serial/drivers/.../new_id
69 Contact: linux-usb@vger.kernel.org
72 extra bus folder "usb-serial" in sysfs; apart from that
87 # echo "046d c315" > /sys/bus/usb/drivers/foo/remove_id
97 If CONFIG_PM is set and a USB 2.0 lpm-capable device is plugged
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/Documentation/core-api/
Dworkqueue.rst33 thread system-wide. A single MT wq needed to keep around the same
60 * Use per-CPU unified worker pools shared by all wq to provide
85 worker-pools.
87 The cmwq design differentiates between the user-facing workqueues that
89 which manages worker-pools and processes the queued work items.
91 There are two worker-pools, one for normal work items and the other
93 worker-pools to serve work items queued on unbound workqueues - the
98 Each per-CPU BH worker pool contains only one pseudo worker which represents
110 When a work item is queued to a workqueue, the target worker-pool is
112 and appended on the shared worklist of the worker-pool. For example,
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/Documentation/trace/
Dftrace.rst2 ftrace - Function Tracer
13 - Written for: 2.6.28-rc2
14 - Updated for: 3.10
15 - Updated for: 4.13 - Copyright 2017 VMware Inc. Steven Rostedt
16 - Converted to rst format - Changbin Du <changbin.du@intel.com>
19 ------------
24 performance issues that take place outside of user-space.
41 ----------------------
43 See Documentation/trace/ftrace-design.rst for details for arch porters and such.
47 ---------------
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/Documentation/trace/coresight/
Dcoresight.rst2 Coresight - HW Assisted Tracing on ARM
9 ------------
38 0 CPU 0<-->: C : 0 CPU 0<-->: C : : C : @ STM @ || System ||
39 |->0000000 : T : |->0000000 : T : : T :<--->@@@@@ || Memory ||
40 | #######<-->: I : | #######<-->: I : : I : @@@<-| ||||||||||||
43 | |->### | ! | |->### | ! | ! . | || DAP ||
49 *****************************************************************<-|
63 | * ===== F =====<---------|
65 |-->:: CTI ::<!! === N ===
69 |------>&& ETB &&<......II I =======
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/Documentation/admin-guide/cifs/
Dusage.rst18 MS-SMB2 (for detailed SMB2/SMB3/SMB3.1.1 protocol specification)
36 (e.g. /usr/src/linux-2.5.73)
48 the modules directory e.g. /lib/modules/6.3.0-060300-generic/kernel/fs/smb/client/cifs.ko).
57 required, mount.cifs is recommended. Most distros include a ``cifs-utils``
63 found at cifs-utils.git on git.samba.org
122 mounts, unless umount is invoked with -i (which will avoid invoking a umount
166 disabled on a per-mount basis by specifying ``nouser_xattr`` on mount.
184 (the few optional settings are passed in on mount via -o parameters instead).
191 ln -s /mnt/foo bar
196 that is ignored by local server applications and non-cifs clients and that will
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/Documentation/admin-guide/
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/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/scsi/
Dncr53c8xx.rst1 .. SPDX-License-Identifier: GPL-2.0
11 95170 DEUIL LA BARRE - FRANCE
64 10.4 PCI configuration fix-up boot option
81 16.1 Synchronous timings for 53C875 and 53C860 Ultra-SCSI controllers
82 16.2 Synchronous timings for fast SCSI-2 53C8XX controllers
97 - Gerard Roudier <groudier@free.fr>
101 - Wolfgang Stanglmeier <wolf@cologne.de>
102 - Stefan Esser <se@mi.Uni-Koeln.de>
106 - ncr53c8xx generic driver that supports all the SYM53C8XX family including
109 - sym53c8xx enhanced driver (a.k.a. 896 drivers) that drops support of oldest
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Dsym53c8xx_2.rst1 .. SPDX-License-Identifier: GPL-2.0
4 SYM-2 driver
11 95170 DEUIL LA BARRE - FRANCE
15 2004-10-09
67 This driver supports the whole SYM53C8XX family of PCI-SCSI controllers.
68 It also support the subset of LSI53C10XX PCI-SCSI controllers that are based
72 with the FreeBSD SYM-2 driver. The 'glue' that allows this driver to work
81 - Wolfgang Stanglmeier <wolf@cologne.de>
82 - Stefan Esser <se@mi.Uni-Koeln.de>
84 1996: port of the ncr driver to Linux-1.2.13 and rename it ncr53c8xx.
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