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/Linux-v6.1/tools/perf/pmu-events/arch/x86/ivytown/
Duncore-cache.json224are passing by and when packets are being sunk, but does not include when packets are being sent f…
234are passing by and when packets are being sunk, but does not include when packets are being sent f…
244are passing by and when packets are being sunk, but does not include when packets are being sent f…
254are passing by and when packets are being sunk, but does not include when packets are being sent f…
264are passing by and when packets are being sunk, but does not include when packets are being sent f…
274are passing by and when packets are being sunk, but does not include when packets are being sent f…
284are passing by and when packets are being sunk, but does not include when packets are being sent f…
294are passing by and when packets are being sunk, but does not include when packets are being sent f…
304are passing by and when packets are being sunk, but does not include when packets are being sent f…
314are passing by and when packets are being sunk, but does not include when packets are being sent f…
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Duncore-other.json8 …e write cache.; When two requests to the same address from the same source are received back to ba…
28 …wnership but have not yet returned their data to the uncore. These writes are generally queued up…
38 …wnership but have not yet returned their data to the uncore. These writes are generally queued up…
48 …"PublicDescription": "Accumulates the number of writes (and write prefetches) that are outstanding…
58 …"PublicDescription": "Accumulates the number of writes (and write prefetches) that are outstanding…
68 …"PublicDescription": "Accumulates the number of reads that are outstanding in the uncore in each c…
78 …"PublicDescription": "Accumulates the number of reads that are outstanding in the uncore in each c…
88 …"PublicDescription": "Accumulates the number of reads and writes that are outstanding in the uncor…
98 …"PublicDescription": "Accumulates the number of reads and writes that are outstanding in the uncor…
108 …"PublicDescription": "Accumulates the number of writes (and write prefetches) that are outstandin…
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/Linux-v6.1/Documentation/input/
Dgamepad.rst12 document defines how gamepads are supposed to report their data.
44 4 buttons in diamonds-shape (on the right side). The buttons are
56 all devices have both or any, but they are present at most times.
59 Triggers are located on the upper-side of the pad in vertical direction.
60 Not all devices provide them, but the upper buttons are normally named
63 Many devices provide force-feedback features. But are mostly just
79 All new gamepads are supposed to comply with this mapping. Please report any
82 There are a lot of less-featured/less-powerful devices out there, which re-use
103 of the labels on the buttons, the codes are sent according to the
106 Please note that 2- and 3-button pads are fairly rare and old. You might
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/Linux-v6.1/Documentation/fb/
Dapi.rst13 buffer core are not described.
24 Device and driver capabilities are reported in the fixed screen information
39 When supported, formats are configured using a FOURCC instead of manually
46 Pixels are stored in memory in hardware-dependent formats. Applications need
50 Formats are described by frame buffer types and visuals. Some visuals require
51 additional information, which are stored in the variable screen information
55 macropixels. Types describe how macropixels are stored in memory. The following
56 types and visuals are supported.
60 Macropixels are stored contiguously in a single plane. If the number of bits
61 per macropixel is not a multiple of 8, whether macropixels are padded to the
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/Linux-v6.1/tools/perf/pmu-events/arch/x86/jaketown/
Duncore-cache.json154are passing by and when packets are being sunk, but does not include when packets are being sent f…
164are passing by and when packets are being sunk, but does not include when packets are being sent f…
174are passing by and when packets are being sunk, but does not include when packets are being sent f…
184are passing by and when packets are being sunk, but does not include when packets are being sent f…
194are passing by and when packets are being sunk, but does not include when packets are being sent f…
204are passing by and when packets are being sunk, but does not include when packets are being sent f…
214are passing by and when packets are being sunk, but does not include when packets are being sent f…
224are passing by and when packets are being sunk, but does not include when packets are being sent f…
234are passing by and when packets are being sunk, but does not include when packets are being sent f…
244are passing by and when packets are being sunk, but does not include when packets are being sent f…
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Duncore-other.json28 …wnership but have not yet returned their data to the uncore. These writes are generally queued up…
38 …wnership but have not yet returned their data to the uncore. These writes are generally queued up…
48 …"PublicDescription": "Accumulates the number of writes (and write prefetches) that are outstanding…
58 …"PublicDescription": "Accumulates the number of writes (and write prefetches) that are outstanding…
68 …"PublicDescription": "Accumulates the number of reads that are outstanding in the uncore in each c…
78 …"PublicDescription": "Accumulates the number of reads that are outstanding in the uncore in each c…
88 …"PublicDescription": "Accumulates the number of reads and writes that are outstanding in the uncor…
98 …"PublicDescription": "Accumulates the number of reads and writes that are outstanding in the uncor…
108 …"PublicDescription": "Accumulates the number of writes (and write prefetches) that are outstandin…
118 …"PublicDescription": "Accumulates the number of writes (and write prefetches) that are outstandin…
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/Linux-v6.1/sound/pci/cs46xx/
Dcs46xx.h173 * The following defines are for the flags in the host interrupt status
208 * The following defines are for the flags in the host signal register 0.
245 * The following defines are for the flags in the host interrupt control
252 * The following defines are for the flags in the DMA status register.
260 * The following defines are for the flags in the host DMA source address
275 * The following defines are for the flags in the host DMA destination address
290 * The following defines are for the flags in the host DMA control register.
299 * The following defines are for the flags in the host DMA control register.
329 * The following defines are for the flags in the performance monitor control
356 * The following defines are for the flags in the performance counter value 1
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/Linux-v6.1/Documentation/userspace-api/media/v4l/
Dcolorspaces.rst20 the human eye has color receptors that are sensitive to three different
22 color. Be glad you are not a mantis shrimp as those are sensitive to 12
27 color receptors are stimulated. This is based on the Spectral Power
35 those receptors and are perceived as the same color, even though the SPD
43 After some further mathematical transforms these stimuli are known as
45 color as perceived by a human unambiguously. These X, Y and Z values are
56 The x and y values are the chromaticity coordinates and can be used to
59 colors are specified with lower case 'x' and 'y', then the CIE xyY
64 will find reading resources that go into much more detail if you are
71 phosphors used in the displays. These *color primaries* are part of what
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/Linux-v6.1/tools/perf/pmu-events/arch/x86/broadwellde/
Duncore-other.json8 …"PublicDescription": "Accumulates the number of reads and writes that are outstanding in the uncor…
18 …"PublicDescription": "Accumulates the number of reads and writes that are outstanding in the uncor…
475 …mes when it is not possible to issue a request to the R2PCIe because there are no AD Egress Credit…
484 …er times when it is not possible to issue data to the R2PCIe because there are no BL Egress Credit…
529are acquired in the R2PCIe agent for sending transactions into the IIO on either NCB or NCS are in…
539are acquired in the R2PCIe agent for sending transactions into the IIO on either NCB or NCS are in…
549are acquired in the R2PCIe agent for sending transactions into the IIO on either NCB or NCS are in…
559are in use. Transactions from the BL ring going into the IIO Agent must first acquire a credit. …
569are in use. Transactions from the BL ring going into the IIO Agent must first acquire a credit. …
579are in use. Transactions from the BL ring going into the IIO Agent must first acquire a credit. …
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Duncore-cache.json32 …he number of cycles either the local distress or incoming distress signals are asserted. Incoming…
281are passing by and when packets are being sunk, but does not include when packets are being sent f…
291are passing by and when packets are being sunk, but does not include when packets are being sent f…
301are passing by and when packets are being sunk, but does not include when packets are being sent f…
311are passing by and when packets are being sunk, but does not include when packets are being sent f…
321are passing by and when packets are being sunk, but does not include when packets are being sent f…
331are passing by and when packets are being sunk, but does not include when packets are being sent f…
341are passing by and when packets are being sunk, but does not include when packets are being sent f…
351are passing by and when packets are being sunk, but does not include when packets are being sent f…
361are passing by and when packets are being sunk, but does not include when packets are being sent f…
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/Linux-v6.1/Documentation/livepatch/
Dlivepatch.rst15 There are many situations where users are reluctant to reboot a system. It may
26 There are multiple mechanisms in the Linux kernel that are directly related
30 - The kernel probes are the most generic. The code can be redirected by
39 are in any way modified.
43 Most of these problems are solved by using the dynamic ftrace framework as
46 a live patch is called with the help of a custom ftrace handler. But there are
53 Functions are there for a reason. They take some input parameters, get or
60 Most of these changes are self contained and the function presents itself
64 But there are more complex fixes. For example, a patch might change
70 when it is safe to do so, e.g. when the affected locks are released
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/Linux-v6.1/tools/include/nolibc/
Dnolibc.h10 * All syscalls are declared as static functions so that they can be optimized
13 * Syscalls are split into 3 levels:
15 * assembly code in compound expressions. These are called my_syscall0() to
17 * implementation is limited to 5 arguments. All input arguments are cast
24 * depending on the syscall definition. These functions are responsible
27 * A few of them are architecture-specific because the syscalls are not all
45 * Some stdint-like integer types are defined. These are valid on all currently
46 * supported architectures, because signs are enforced, ints are assumed to be
53 * The definitions start with the architecture-specific parts, which are picked
54 * based on what the compiler knows about the target architecture, and are
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/Linux-v6.1/Documentation/admin-guide/pm/
Dsuspend-flows.rst26 different sleep states of the system are quite similar, but there are some
36 states are mostly identical, so they both together will be referred to as
45 The following steps are taken in order to transition the system from the working
58 Tasks are frozen primarily in order to avoid unchecked hardware accesses
64 All user space tasks are intercepted as though they were sent a signal and
69 specific reasons are frozen subsequently, but they are not intercepted.
70 Instead, they are expected to periodically check whether or not they need
79 Devices are suspended in four phases called *prepare*, *suspend*,
87 phase and high-level ("action") interrupt handlers are prevented from being
90 Interrupts are still handled after that, but they are only acknowledged to
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/Linux-v6.1/tools/perf/pmu-events/arch/arm64/arm/cortex-a75/
Dpipeline.json21 "PublicDescription": "Duration for which all slots in the Load-Store Unit (LSU) are busy",
24 "BriefDescription": "Duration for which all slots in the Load-Store Unit (LSU) are busy"
27 …all slots in the load-store issue queue are busy. This event counts the cycles where all slots in …
30 …all slots in the load-store issue queue are busy. This event counts the cycles where all slots in …
33 … in the data processing issue queue are busy. This event counts the cycles where all slots in the …
36 … in the data processing issue queue are busy. This event counts the cycles where all slots in the …
39 …"PublicDescription": "Duration for which all slots in the data engine issue queue are busy. This e…
42 …"BriefDescription": "Duration for which all slots in the data engine issue queue are busy. This ev…
/Linux-v6.1/Documentation/process/
Dhowto.rst31 are not a good substitute for a solid C education and/or years of
32 experience, the following books are good for, if anything, reference:
39 adheres to the ISO C11 standard, it uses a number of extensions that are
42 portions of the C standard are not supported. Arbitrary long long
43 divisions and floating point are not allowed. It can sometimes be
49 Please remember that you are trying to learn how to work with the
54 possible about these standards ahead of time, as they are well
64 rules and how to use `SPDX <https://spdx.org/>`_ identifiers in source code are
67 not ask on the Linux kernel mailing list. The people on the mailing lists are
78 The Linux kernel source tree has a large range of documents that are
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/Linux-v6.1/Documentation/mm/
Dhugetlbfs_reserv.rst10 Huge pages as described at :ref:`hugetlbpage` are typically
11 preallocated for application use. These huge pages are instantiated in a
12 task's address space at page fault time if the VMA indicates huge pages are
28 This description is primarily targeted at kernel developers who are modifying
37 huge pages are only available to the task which reserved them.
62 The 'from' and 'to' fields of the file region structure are huge page
67 These are stored in the bottom bits of the reservation map pointer.
89 of mappings. Location differences are:
95 inode->i_mapping->private_data. Since shared mappings are always backed
103 Reservations are created when a huge page backed shared memory segment is
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/Linux-v6.1/Documentation/admin-guide/LSM/
DSmack.rst15 are encouraged to compare Smack with the other mechanisms
22 - Basic utilities, which are helpful but not required
32 configurations are intolerant of IP options and can impede
44 There are five commands included in smackutil:
56 These two commands are obsolete with the introduction of
78 objects. The attributes are stored in the extended attribute security
82 The extended attributes that Smack uses are:
118 There are multiple ways to set a Smack label on a file::
177 The following numbers are the categories::
189 The following numbers are the categories::
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/Linux-v6.1/Documentation/devicetree/bindings/
Dwriting-schema.rst6 Devicetree bindings are written using json-schema vocabulary. Schema files are
18 top-level json-schema properties used are:
48 schema. By default, without 'select', nodes are matched against their possible
58 binding. The exact schema syntax depends on whether properties are known,
59 common properties (e.g. 'interrupts') or are binding/vendor-specific
68 Optional. Similar to 'properties', but names are regex.
78 Unless noted otherwise, all properties are required.
85 vocabulary for that property. The properties schemas are what are used for
89 binding schema need to be defined such as how many values are valid or what
90 possible values are valid.
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/Linux-v6.1/Documentation/admin-guide/device-mapper/
Dstatistics.rst6 regions of a DM device. If no regions are defined no statistics are
8 devices are currently supported.
14 The I/O statistics counters for each step-sized area of a region are
16 Documentation/admin-guide/iostats.rst). But two extra counters (12 and 13) are
22 The reported times are in milliseconds and the granularity depends on
24 reported times are in nanoseconds.
65 The following optional arguments are supported:
70 used, the resulting times are in nanoseconds instead of
71 milliseconds. Precise timestamps are a little bit slower
75 numbers n1, n2, etc are times that represent the boundaries
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/Linux-v6.1/Documentation/filesystems/
Dext2.rst11 filesystem in use by Linux. There are also implementations available
17 Most defaults are determined by the filesystem superblock, and can be
18 set using tune2fs(8). Kernel-determined defaults are indicated by (*).
78 compression though these are not yet implemented (some are available as
86 The space in the device or file is split up into blocks. These are
95 Blocks are clustered into block groups in order to reduce fragmentation
99 Two blocks near the start of each group are reserved for the block usage
101 are in use. Since each bitmap is limited to a single block, this means
104 The block(s) following the bitmaps in each block group are designated
105 as the inode table for that block group and the remainder are the data
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Dsquashfs.rst10 directories. Inodes in the system are very small and all blocks are packed to
11 minimise data overhead. Block sizes greater than 4K are supported up to a
51 directory data are highly compacted, and packed on byte boundaries. Each
100 Compressed data blocks are written to the filesystem as files are read from
103 xattr tables are written.
110 these are stored here.
115 Metadata (inodes and directories) are compressed in 8Kbyte blocks. Each
120 Inodes are packed into the metadata blocks, and are not aligned to block
121 boundaries, therefore inodes overlap compressed blocks. Inodes are identified
126 To maximise compression there are different inodes for each file type
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/Linux-v6.1/Documentation/hid/
Dhid-transport.rst15 drivers on top of it. The transport drivers are responsible for raw data
18 and quirks are handled by all layers depending on the quirk.
62 drivers are not required to register themselves with HID core. HID core is never
63 aware of which transport drivers are available and is not interested in it. It
68 this struct are used by HID core to communicate with the device.
70 Transport drivers are responsible for detecting device failures and unplugging.
100 reports. No management commands or data acknowledgements are sent on this
103 send their input events on this channel. Outgoing events are normally
107 channel and are normally ignored. Instead, devices only send management
111 Outgoing reports are usually sent on the ctrl channel via synchronous
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/Linux-v6.1/net/netlabel/
Dnetlabel_mgmt.h23 * The following NetLabel payloads are supported by the management interface.
33 * If IPv4 is specified the following attributes are required:
38 * If IPv6 is specified the following attributes are required:
43 * If using NETLBL_NLTYPE_CIPSOV4 the following attributes are required:
47 * If using NETLBL_NLTYPE_UNLABELED no other attributes are required,
71 * If the IP address selectors are not used the following attribute is
76 * If the IP address selectors are used then the following attritbute is
82 * attributes are required:
87 * attributes are required.
97 * If using NETLBL_NLTYPE_CIPSOV4 the following attributes are required:
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/Linux-v6.1/Documentation/
Datomic_t.txt5 RMW operations between CPUs (atomic operations on MMIO are not supported and
82 The non-RMW ops are (typically) regular LOADs and STOREs and are canonically
86 and are doing it wrong.
91 C Atomic-RMW-ops-are-atomic-WRT-atomic_set
142 these are limited to the arithmetic operations because those are
143 reversible. Bitops are irreversible and therefore the modified value
150 - misc; the special purpose operations that are commonly used and would,
152 are time critical and can, (typically) on LL/SC architectures, be more
155 All these operations are SMP atomic; that is, the operations (for a single
165 - non-RMW operations are unordered;
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/Linux-v6.1/Documentation/core-api/
Dthis_cpu_ops.rst8 this_cpu operations are a way of optimizing access to per cpu
18 This means that there are no atomicity issues between the calculation of
24 Read-modify-write operations are of particular interest. Frequently
32 synchronization is not necessary since we are dealing with per cpu
34 processor should be accessing that variable and therefore there are no
37 Please note that accesses by remote processors to a per cpu area are
45 are defined. These operations can be used without worrying about
116 the value of the individual counters for each processor are
120 Per cpu variables are used for performance reasons. Bouncing cache
190 Operations on these fields are straightforward::
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