Searched +full:wait +full:- +full:free +full:- +full:us (Results 1 – 25 of 40) sorted by relevance
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| /Documentation/devicetree/bindings/i2c/ |
| D | i2c-arb-gpio-challenge.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-arb-gpio-challenge.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO-based I2C Arbitration Using a Challenge & Response Mechanism
10 - Doug Anderson <dianders@chromium.org>
11 - Peter Rosin <peda@axentia.se>
18 standard I2C multi-master rules. Using GPIOs is generally useful in the case
30 others can see. These are all active low with pull-ups enabled. We'll
32 * OUR_CLAIM: output from us signaling to other hosts that we want the bus
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| /Documentation/timers/ |
| D | timers-howto.rst | 2 delays - Information on the various kernel delay / sleep mechanisms
14 ----------------
23 and will busy wait for enough loop cycles to achieve
30 udelay is the generally preferred API; ndelay-level
31 precision may not actually exist on many non-PC devices.
38 NON-ATOMIC CONTEXT:
45 -- Backed by busy-wait loop:
49 -- Backed by hrtimers:
53 -- Backed by jiffies / legacy_timers
63 SLEEPING FOR "A FEW" USECS ( < ~10us? ):
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| /Documentation/RCU/ |
| D | RTFP.txt | 4 This document describes RCU-related publications, and is followed by
19 with short-lived threads, such as the K42 research operating system.
20 However, Linux has long-lived tasks, so more is needed.
23 serialization, which is an RCU-like mechanism that relies on the presence
27 that these overheads were not so expensive in the mid-80s. Nonetheless,
28 passive serialization appears to be the first deferred-destruction
30 has lapsed, so this approach may be used in non-GPL software, if desired.
34 In 1987, Rashid et al. described lazy TLB-flush [RichardRashid87a].
36 this paper helped inspire the update-side batching used in the later
38 a description of Argus that noted that use of out-of-date values can
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| D | whatisRCU.rst | 3 What is RCU? -- "Read, Copy, Update"
21 …ries: Fundamentals https://www.linuxfoundation.org/webinars/unraveling-rcu-usage-mysteries
22 …Cases https://www.linuxfoundation.org/webinars/unraveling-rcu-usage-mysteries-additional-use-cases
28 during the 2.5 development effort that is optimized for read-mostly
47 :ref:`6. ANALOGY WITH READER-WRITER LOCKING <6_whatisRCU>`
67 everything, feel free to read the whole thing -- but if you are really
69 never need this document anyway. ;-)
74 ----------------
103 b. Wait for all previous readers to complete their RCU read-side
111 The ability to wait until all readers are done allows RCU readers to
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| /Documentation/filesystems/xfs/ |
| D | xfs-delayed-logging-design.rst | 1 .. SPDX-License-Identifier: GPL-2.0
33 details logged are made up of the changes to in-core structures rather than
34 on-disk structures. Other objects - typically buffers - have their physical
64 place. This means that permanent transactions can be used for one-shot
65 modifications, but one-shot reservations cannot be used for permanent
68 In the code, a one-shot transaction pattern looks somewhat like this::
97 While this might look similar to a one-shot transaction, there is an important
123 the on-disk journal.
142 in the journal and wait for that to complete.
165 transaction, we have to reserve enough space to record a full leaf-to-root split
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| D | xfs-online-fsck-design.rst | 1 .. 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/dev-tools/ |
| D | gpio-sloppy-logic-analyzer.rst | 1 .. SPDX-License-Identifier: GPL-2.0
12 This document briefly describes how to run the GPIO based in-kernel sloppy
22 Another feature is to snoop on on-chip peripherals if the I/O cells of these
26 control subsystem such pin controllers are called "non-strict": a certain pin
31 non-deterministic code paths and non-maskable interrupts. It is called 'sloppy'
47 i2c-analyzer {
48 compatible = "gpio-sloppy-logic-analyzer";
49 probe-gpios = <&gpio6 21 GPIO_OPEN_DRAIN>, <&gpio6 4 GPIO_OPEN_DRAIN>;
50 probe-names = "SCL", "SDA";
62 ``tools/gpio/gpio-sloppy-logic-analyzer``. Besides checking parameters more
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| /Documentation/filesystems/bcachefs/ |
| D | CodingStyle.rst | 1 .. SPDX-License-Identifier: GPL-2.0
8 A little weeding here and there goes a long way; don't wait until things have
11 Things don't always have to be perfect - nitpicking often does more harm than
12 good. But appreciate beauty when you see it - and let people know.
26 you're not sure if it can happen and not sure how to handle it yet - make it a
33 expensive - but don't turn everything into a debug mode assertion, so that
51 A good assertion checks something that the compiler could check for us, and
52 elide - if we were working in a language with embedded correctness proofs that
56 invariants with runtime checks - much like the way people working in
60 Looking for ways to make your assertions simpler - and higher level - will
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| /Documentation/filesystems/ |
| D | path-lookup.txt | 17 thus in every component during path look-up. Since 2.5.10 onwards, fast-walk
23 make dcache look-up lock-free.
30 are path-walk intensive tend to do path lookups starting from a common dentry
35 (including dcache look-up) completely "store-free" (so, no locks, atomics, or
36 even stores into cachelines of common dentries). This is known as "rcu-walk"
42 A name string specifies a start (root directory, cwd, fd-relative) and a
45 elements are sub-strings, separated by '/'.
49 the path given by the name's starting point (which we know in advance -- eg.
50 current->fs->cwd or current->fs->root) as the first parent of the lookup. Then
67 - find the start point of the walk;
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| D | orangefs.rst | 1 .. SPDX-License-Identifier: GPL-2.0
7 OrangeFS is an LGPL userspace scale-out parallel storage system. It is ideal
51 On Fedora, install orangefs and orangefs-server::
53 dnf -y install orangefs orangefs-server
64 pvfs2-client-core.
68 pvfs2-server -f /etc/orangefs/orangefs.conf
72 systemctl start orangefs-server
76 pvfs2-ping -m /pvfsmnt
81 systemctl start orangefs-client
85 mount -t pvfs2 tcp://localhost:3334/orangefs /pvfsmnt
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| D | vfs.rst | 1 .. SPDX-License-Identifier: GPL-2.0
9 - Copyright (C) 1999 Richard Gooch
10 - Copyright (C) 2005 Pekka Enberg
27 ------------------------------
32 cache or dcache). This provides a very fast look-up mechanism to
44 ----------------
64 ---------------
67 structure (this is the kernel-side implementation of file descriptors).
88 .. code-block:: c
99 ->mount() will be attached to the mountpoint, so that when pathname
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| /Documentation/driver-api/media/ |
| D | cec-core.rst | 1 .. SPDX-License-Identifier: GPL-2.0
15 ----------------
33 ---------------------
53 will be stored in adap->priv and can be used by the adapter ops.
95 Implementing the Low-Level CEC Adapter
96 --------------------------------------
98 The following low-level adapter operations have to be implemented in
103 .. code-block:: none
107 /* Low-level callbacks */
123 /* High-level callback */
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| /Documentation/trace/ |
| D | ftrace.rst | 2 ftrace - Function Tracer
8 :License: The GNU Free Documentation License, Version 1.2
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.
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| /Documentation/driver-api/media/drivers/ |
| D | zoran.rst | 1 .. SPDX-License-Identifier: GPL-2.0
8 website: http://mjpeg.sourceforge.net/driver-zoran/
12 --------------------------
15 ------------------------
28 Drivers to use: videodev, i2c-core, i2c-algo-bit,
31 Inputs/outputs: Composite and S-video
45 Drivers to use: videodev, i2c-core, i2c-algo-bit,
49 Six physical inputs. 1-6 are composite,
50 1-2, 3-4, 5-6 doubles as S-video,
51 1-3 triples as component.
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| /Documentation/misc-devices/ |
| D | ibmvmc.rst | 1 .. SPDX-License-Identifier: GPL-2.0+
8 Dave Engebretsen <engebret@us.ibm.com>,
21 https://openpowerfoundation.org/wp-content/uploads/2016/05/LoPAPR_DRAFT_v11_24March2016_cmt1.pdf
27 Console (HMC) - based system management.
31 packaged as an external tower or rack-mounted personal computer. In a
33 processor-based systems.
36 ----------------------
44 POWER8 or newer processor-based server that is virtualized by PowerVM.
57 - Logical Partitioning Configuration
58 - Start, and stop actions for individual partitions
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| /Documentation/admin-guide/ |
| D | ext4.rst | 1 .. SPDX-License-Identifier: GPL-2.0
9 (64 bit) in keeping with increasing disk capacities and state-of-the-art
12 Mailing list: linux-ext4@vger.kernel.org
23 - The latest version of e2fsprogs can be found at:
35 - Create a new filesystem using the ext4 filesystem type:
37 # mke2fs -t ext4 /dev/hda1
41 # tune2fs -O extents /dev/hda1
46 # tune2fs -I 256 /dev/hda1
48 - Mounting:
50 # mount -t ext4 /dev/hda1 /wherever
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| D | bcache.rst | 11 This is the git repository of bcache-tools:
12 https://git.kernel.org/pub/scm/linux/kernel/git/colyli/bcache-tools.git/
17 It's designed around the performance characteristics of SSDs - it only allocates
25 great lengths to protect your data - it reliably handles unclean shutdown. (It
29 Writeback caching can use most of the cache for buffering writes - writing
36 average is above the cutoff it will skip all IO from that task - instead of
47 You'll need bcache util from the bcache-tools repository. Both the cache device
50 bcache make -B /dev/sdb
51 bcache make -C /dev/sdc
53 `bcache make` has the ability to format multiple devices at the same time - if
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| /Documentation/RCU/Design/Requirements/ |
| D | Requirements.rst | 16 ------------
18 Read-copy update (RCU) is a synchronization mechanism that is often used
19 as a replacement for reader-writer locking. RCU is unusual in that
20 updaters do not block readers, which means that RCU's read-side
28 thought of as an informal, high-level specification for RCU. It is
40 #. `Fundamental Non-Requirements`_
42 #. `Quality-of-Implementation Requirements`_
44 #. `Software-Engineering Requirements`_
53 ------------------------
58 #. `Grace-Period Guarantee`_
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| /Documentation/scsi/ |
| D | ChangeLog.lpfc | 2 * Please read the associated RELEASE-NOTES file !!!
8 * Fixed build warning for 2.6.12-rc2 kernels: mempool_alloc now
19 * Removed FC_TRANSPORT_PATCHESxxx defines. They're in 2.6.12-rc1.
26 * Added PCI ID for LP10000-S.
31 * Zero-out response sense length in lpfc_scsi_prep_cmnd to prevent
33 - was causing spurious 0710 messages.
55 - stop using volatile. if you need special ordering use memory
57 - switch lpfc_sli_pcimem_bcopy to take void * arguments.
58 - remove typecast for constants - a U postfix marks them
60 - add a MAILBOX_CMD_SIZE macro, as most users of
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| D | ChangeLog.megaraid | 1 Release Date : Thu Nov 16 15:32:35 EST 2006 -
9 and re-initialize its internal RAID structure.
14 2. Authors email-id domain name changed from lsil.com to lsi.com.
17 Release Date : Fri May 19 09:31:45 EST 2006 - Seokmann Ju <sju@lsil.com>
23 Root Cause: the driver registered controllers as 64-bit DMA capable
26 identifying 64-bit DMA capable controllers.
28 > -----Original Message-----
31 > To: linux-scsi@vger.kernel.org; Kolli, Neela; Mukker, Atul;
86 issue on 64-bit platform.
93 > -----Original Message-----
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| /Documentation/locking/ |
| D | rt-mutex-design.rst | 2 RT-mutex implementation design
7 Licensed under the GNU Free Documentation License, Version 1.2
12 Documentation/locking/rt-mutex.rst. Although this document does explain problems
22 ----------------------------
28 the high priority process must wait until the lower priority process is done
37 that C owns and must wait and lets C run to release the lock. But in the
49 A ---+
52 C +----+
54 B +-------->
59 -------------------------
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| /Documentation/process/ |
| D | submitting-patches.rst | 13 works, see Documentation/process/development-process.rst. Also, read
14 Documentation/process/submit-checklist.rst
17 Documentation/devicetree/bindings/submitting-patches.rst.
20 If you're unfamiliar with ``git``, you would be well-advised to learn how to
26 :ref:`Documentation/process/maintainer-handbooks.rst <maintainer_handbooks_main>`.
29 ----------------------------
46 ---------------------
48 Describe your problem. Whether your patch is a one-line bug fix or
54 Describe user-visible impact. Straight up crashes and lockups are
59 vendor/product-specific trees that cherry-pick only specific patches
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| D | handling-regressions.rst | 1 .. SPDX-License-Identifier: (GPL-2.0+ OR CC-BY-4.0)
7 *We don't cause regressions* -- this document describes what this "first rule of
9 Documentation/admin-guide/reporting-regressions.rst, which covers the topic from a
21 loop by immediately sending at least a brief "Reply-all" with the list
30 introduced: v5.13..v5.14-rc1``. If not, send a reply (with the regressions
39 #regzbot introduced: v5.13..v5.14-rc1
45 mandated by Documentation/process/submitting-patches.rst and
61 -----------------------------------
72 it into the loop by sending at least a brief "Reply-all" with the list CCed;
79 Documentation/admin-guide/reporting-issues.rst.
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| /Documentation/admin-guide/media/ |
| D | vivid.rst | 1 .. SPDX-License-Identifier: GPL-2.0
13 Each input can be a webcam, TV capture device, S-Video capture device or an HDMI
14 capture device. Each output can be an S-Video output device or an HDMI output
23 - Support for read()/write(), MMAP, USERPTR and DMABUF streaming I/O.
24 - A large list of test patterns and variations thereof
25 - Working brightness, contrast, saturation and hue controls
26 - Support for the alpha color component
27 - Full colorspace support, including limited/full RGB range
28 - All possible control types are present
29 - Support for various pixel aspect ratios and video aspect ratios
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| /Documentation/sound/ |
| D | alsa-configuration.rst | 2 Advanced Linux Sound Architecture - Driver Configuration guide
38 ----------
47 limiting card index for auto-loading (1-8);
49 For auto-loading more than one card, specify this option
50 together with snd-card-X aliases.
63 Module snd-pcm-oss
64 ------------------
86 regarding opening the device. When this option is non-zero,
90 Module snd-rawmidi
91 ------------------
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