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/linux-6.8/Documentation/admin-guide/mm/
Dpagemap.rst12 physical frame each virtual page is mapped to. It contains one 64-bit
16 * Bits 0-54 page frame number (PFN) if present
17 * Bits 0-4 swap type if swapped
18 * Bits 5-54 swap offset if swapped
19 * Bit 55 pte is soft-dirty (see
20 Documentation/admin-guide/mm/soft-dirty.rst)
22 * Bit 57 pte is uffd-wp write-protected (since 5.13) (see
23 Documentation/admin-guide/mm/userfaultfd.rst)
24 * Bits 58-60 zero
25 * Bit 61 page is file-page or shared-anon (since 3.5)
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Dzswap.rst9 in the process of being swapped out and attempts to compress them into a
10 dynamically allocated RAM-based memory pool. zswap basically trades CPU cycles
11 for potentially reduced swap I/O. This trade-off can also result in a
24 drastically reducing life-shortening writes.
31 the ``CONFIG_ZSWAP_DEFAULT_ON`` Kconfig option is enabled or not.
41 being swapped out. However, it will _not_ immediately write out or fault
46 fault back into memory all swapped out pages, including those in the
57 allocation in zpool is not directly accessible by address. Rather, a handle is
60 pages are freed. The pool is not preallocated. By default, a zpool
69 means the compression ratio will always be 2:1 or worse (because of half-full
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Dconcepts.rst7 systems from MMU-less microcontrollers to supercomputers. The memory
21 the amount of memory that can be installed. The physical memory is not
80 improves TLB hit-rate and thus improves overall system performance.
87 Documentation/admin-guide/mm/hugetlbpage.rst.
94 name. See Documentation/admin-guide/mm/transhuge.rst for more details
107 devices for DMA, ZONE_HIGHMEM will contain memory that is not
111 The actual layout of the memory zones is hardware dependent as not all
118 Many multi-processor machines are NUMA - Non-Uniform Memory Access -
126 Documentation/admin-guide/mm/numa_memory_policy.rst.
144 is not backed by a filesystem. Such mappings are implicitly created
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/linux-6.8/arch/sparc/kernel/
Dadi_64.c1 // SPDX-License-Identifier: GPL-2.0-only
18 * pages. When ADI enabled pages are being swapped out, it would be
32 * Hypervisor reports ADI capabilities of platform in "hwcap-list" property
33 * for "cpu" node. If the platform supports ADI, "hwcap-list" property
35 * node will contain "adp-blksz", "adp-nbits" and "ue-on-adp" properties
52 prop = mdesc_get_property(hp, pn, "hwcap-list", &len); in mdesc_adi_init()
57 * Look for "adp" keyword in hwcap-list which would indicate in mdesc_adi_init()
71 len -= plen; in mdesc_adi_init()
78 * properties are not found, ADI support is incomplete and in mdesc_adi_init()
79 * do not enable ADI in the kernel. in mdesc_adi_init()
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/linux-6.8/sound/firewire/dice/
Ddice-interface.h1 /* SPDX-License-Identifier: GPL-2.0 */
11 * block read transactions with at least quadlet-aligned offset and length.
12 * Writes are not allowed except where noted; quadlet-sized registers must be
15 * All values are in big endian. The DICE firmware runs on a little-endian CPU
16 * and just byte-swaps _all_ quadlets on the bus, so values without endianness
17 * (e.g. strings) get scrambled and must be byte-swapped again by the driver.
32 * size values are measured in quadlets. Read-only.
50 * Stores the full 64-bit address (node ID and offset in the node's address
60 * A bitmask with asynchronous events; read-only. When any event(s) happen,
74 /* Other bits may be used for device-specific events. */
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/linux-6.8/drivers/platform/x86/
Dtouchscreen_dmi.c1 // SPDX-License-Identifier: GPL-2.0-or-later
21 /* The EFI embedded-fw code expects this to be the first member! */
30 PROPERTY_ENTRY_U32("touchscreen-size-x", 1850),
31 PROPERTY_ENTRY_U32("touchscreen-size-y", 1280),
32 PROPERTY_ENTRY_BOOL("touchscreen-inverted-y"),
33 PROPERTY_ENTRY_BOOL("touchscreen-swapped-x-y"),
34 PROPERTY_ENTRY_U32("silead,max-fingers", 10),
35 PROPERTY_ENTRY_BOOL("silead,home-button"),
36 PROPERTY_ENTRY_STRING("firmware-name", "gsl1680-archos-101-cesium-educ.fw"),
46 PROPERTY_ENTRY_U32("touchscreen-size-x", 1850),
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/linux-6.8/drivers/media/platform/renesas/
Drenesas-ceu.c1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (C) 2017-2018 Jacopo Mondi <jacopo+renesas@jmondi.org>
6 * Based on soc-camera driver "soc_camera/sh_mobile_ceu_camera.c"
9 * Based on V4L2 Driver for PXA camera host - "pxa_camera.c",
16 #include <linux/dma-mapping.h>
32 #include <media/v4l2-async.h>
33 #include <media/v4l2-common.h>
34 #include <media/v4l2-ctrls.h>
35 #include <media/v4l2-dev.h>
36 #include <media/v4l2-device.h>
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/linux-6.8/mm/
Dshmem.c6 * 2000-2001 Christoph Rohland
7 * 2000-2001 SAP AG
9 * Copyright (C) 2002-2011 Hugh Dickins.
11 * Copyright (C) 2002-2005 VERITAS Software Corporation.
18 * tiny-shmem:
61 #include <linux/backing-dev.h>
102 * inode->i_private (with i_rwsem making sure that it has only one user at
103 * a time): we would prefer not to enlarge the shmem inode just for that.
144 return min3(nr_pages - totalhigh_pages(), nr_pages / 2, in shmem_default_max_inodes()
155 return sb->s_fs_info; in SHMEM_SB()
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Dmincore.c1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1994-2006 Linus Torvalds
30 unsigned char *vec = walk->private; in mincore_hugetlb()
34 * swapped out, but theoretically it needs to be checked. in mincore_hugetlb()
39 walk->private = vec; in mincore_hugetlb()
49 * and is up to date; i.e. that no page-in operation would be required
59 * file will not get a swp_entry_t in its pte, but rather it is like in mincore_page()
61 * tmpfs's .fault). So swapped out tmpfs mappings are tested here. in mincore_page()
75 unsigned long nr = (end - addr) >> PAGE_SHIFT; in __mincore_unmapped_range()
78 if (vma->vm_file) { in __mincore_unmapped_range()
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/linux-6.8/Documentation/userspace-api/media/v4l/
Duserp.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
14 particular user pointer method (not only memory mapping) is supported
21 data are exchanged, these pointers and meta-information are passed in
23 :c:type:`v4l2_plane` in the multi-planar API case). The
26 No buffers (planes) are allocated beforehand, consequently they are not
33 .. code-block:: c
41 if (ioctl (fd, VIDIOC_REQBUFS, &reqbuf) == -1) {
43 printf ("Video capturing or user pointer streaming is not supported\\n");
57 swapped out to disk they are brought back and finally locked in physical
66 Applications must take care not to free buffers without dequeuing.
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/linux-6.8/include/uapi/linux/
Dvirtio_balloon.h18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
64 #define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
65 #define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */
77 VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \
78 VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \
79 VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \
80 VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \
81 VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \
82 VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \
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/linux-6.8/arch/mips/cavium-octeon/
Docteon-platform.c6 * Copyright (C) 2004-2017 Cavium, Inc.
18 #include <asm/octeon/cvmx-helper-board.h>
24 #include <asm/octeon/cvmx-uctlx-defs.h>
78 if (dev->of_node) { in octeon2_usb_clocks_start()
82 uctl_node = of_get_parent(dev->of_node); in octeon2_usb_clocks_start()
88 "refclk-frequency", &clock_rate); in octeon2_usb_clocks_start()
90 dev_err(dev, "No UCTL \"refclk-frequency\"\n"); in octeon2_usb_clocks_start()
95 "refclk-type", &clock_type); in octeon2_usb_clocks_start()
203 * Step 4: Program the power-on reset field in the UCTL in octeon2_usb_clocks_start()
204 * clock-reset-control register. in octeon2_usb_clocks_start()
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/linux-6.8/drivers/gpu/drm/nouveau/
Dnouveau_exec.c1 // SPDX-License-Identifier: MIT
24 * userspace-managable portion of the VA space. It provides operations to map
25 * and unmap memory. Mappings may be flagged as sparse. Sparse mappings are not
30 * bounds (but not crossing those bounds) of a previously mapped sparse
38 * Unmap requests are not bound to the range of existing mappings and can even
49 * The kernel does not permit to:
50 * - unmap non-existent sparse mappings
51 * - unmap a sparse mapping and map a new sparse mapping overlapping the range
53 * - unmap a sparse mapping and map new memory backed mappings overlapping the
59 * mappings are created in the GPU's MMU. If the given memory is swapped out
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/linux-6.8/Documentation/input/devices/
Dsentelic.rst8 :Copyright: |copy| 2002-2011 Sentelic Corporation.
10 :Last update: Dec-07-2011
28 BYTE |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
30 |---------------| |---------------| |---------------| |---------------|
37 Bit2 => Middle Button, 1 is pressed, 0 is not pressed.
38 Bit1 => Right Button, 1 is pressed, 0 is not pressed.
39 Bit0 => Left Button, 1 is pressed, 0 is not pressed.
40 Byte 2: X Movement(9-bit 2's complement integers)
41 Byte 3: Y Movement(9-bit 2's complement integers)
43 valid values, -8 ~ +7
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/linux-6.8/arch/s390/appldata/
Dappldata_mem.c1 // SPDX-License-Identifier: GPL-2.0
3 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
23 #define P2K(x) ((x) << (PAGE_SHIFT - 10)) /* Converts #Pages to KB */
37 same. If not, the record has been updated on
43 u64 pswpin; /* pages swapped in */
44 u64 pswpout; /* pages swapped out */
58 // New in 2.6 -->
62 // <-- New in 2.6
83 mem_data->sync_count_1++; in appldata_get_mem_data()
86 mem_data->pgpgin = ev[PGPGIN] >> 1; in appldata_get_mem_data()
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/linux-6.8/net/bluetooth/
Dlib.c2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
34 * baswap() - Swaps the order of a bd address
35 * @dst: Pointer to a bdaddr_t struct that will store the swapped
37 * @src: Pointer to the bdaddr_t struct to be swapped.
49 d[i] = s[5 - i]; in baswap()
54 * bt_to_errno() - Bluetooth error codes to standard errno
64 * If the given bt error code is not known, ENOSYS is returned.
160 * bt_status() - Standard errno value to Bluetooth error code
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/linux-6.8/drivers/cpuidle/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
10 CPU idle is a generic framework for supporting software-controlled
11 idle processor power management. It includes modular cross-platform
12 governors that can be swapped during runtime.
14 If you're using an ACPI-enabled platform, you should say Y here.
31 focused on timer events and does not do any interactivity boosting.
34 to use. Say Y here if you are not happy with the alternatives.
69 menu "RISC-V CPU Idle Drivers"
/linux-6.8/drivers/mtd/parsers/
Dredboot.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Parse RedBoot-style Flash Image System (FIS) tables and
7 * Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org>
26 unsigned char _pad[256 - (16 + 7 * sizeof(u32))];
60 ret = of_property_read_u32(npart, "fis-index-block", &dirblock); in parse_redboot_of()
95 offset = master->size + directory * master->erasesize; in parse_redboot_partitions()
99 pr_notice("Failed to find a non-bad block to check for RedBoot partition table\n"); in parse_redboot_partitions()
100 return -EIO; in parse_redboot_partitions()
102 offset -= master->erasesize; in parse_redboot_partitions()
105 offset = directory * master->erasesize; in parse_redboot_partitions()
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/linux-6.8/arch/riscv/include/asm/
Dpgtable-bits.h1 /* SPDX-License-Identifier: GPL-2.0-only */
25 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
26 * distinguish them from swapped out pages
/linux-6.8/fs/btrfs/
Dqgroup.h1 /* SPDX-License-Identifier: GPL-2.0 */
13 #include "delayed-ref.h"
28 * - Newly allocated extents
29 * - Extents going to be deleted (in this trans)
30 * - Extents whose owner is going to be modified
61 * 1) Record the subtree root block get swapped.
73 * In this case, NA and OA are going to be swapped, record (NA, OA) into
100 * modification to the swapped subtrees, no need to trigger heavy qgroup
161 * Space reserved for metadata (per-transaction)
187 * *currently* meta is just reserve-and-clear during transaction.
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/linux-6.8/arch/sh/include/cpu-sh2/cpu/
Dwatchdog.h1 /* SPDX-License-Identifier: GPL-2.0
3 * include/asm-sh/cpu-sh2/watchdog.h
11 * More SH-2 brilliance .. its not good enough that we can't read
35 * sh_wdt_read_rstcsr - Read from Reset Control/Status Register
42 * Same read/write brain-damage as for WTCNT here.. in sh_wdt_read_rstcsr()
48 * sh_wdt_write_csr - Write to Reset Control/Status Register
58 * Note: Due to the brain-damaged nature of this register, in sh_wdt_write_rstcsr()
60 * has to be swapped for this. So just leave it alone.. in sh_wdt_write_rstcsr()
/linux-6.8/drivers/gpu/drm/i915/gem/
Di915_gem_shrinker.c2 * SPDX-License-Identifier: MIT
4 * Copyright © 2008-2015 Intel Corporation
13 #include <linux/dma-buf.h>
37 return swap_available() || obj->mm.madv == I915_MADV_DONTNEED; in can_release_pages()
61 if (obj->ops->shrink) { in try_to_writeback()
70 return obj->ops->shrink(obj, shrink_flags); in try_to_writeback()
77 * i915_gem_shrink - Shrink buffer object caches
89 * Note that it's not guaranteed that released amount is actually available as
90 * free system memory - the pages might still be in-used to due to other reasons
95 * Also note that any kind of pinning (both per-vma address space pins and
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/linux-6.8/Documentation/virt/kvm/s390/
Ds390-pv-dump.rst1 .. SPDX-License-Identifier: GPL-2.0
8 -------
27 ------------
45 in the dump data. For the same reason it is very important to not only
52 time of the export does not matter as no re-encryption is
53 needed. Memory that has been swapped out and hence was exported can be
/linux-6.8/arch/arm64/kernel/
Dimage.h1 /* SPDX-License-Identifier: GPL-2.0-only */
17 * There aren't any ELF relocations we can use to endian-swap values known only
19 * the linker to endian-swap certain values before emitting them.
22 * (for KASLR), these values should not be referenced via R_AARCH64_ABS64
24 * when PIE is in effect. So we need to split them up in 32-bit high and low
50 #define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2)
59 * These will output as part of the Image header, which should be little-endian
61 * endian swapped in head.S, all are done here for consistency.
64 DEFINE_IMAGE_LE64(_kernel_size_le, _end - _text); \
/linux-6.8/Documentation/arch/sparc/
Dadi.rst34 SPARC M7 processor, MMU uses bits 63-60 for version tags and ADI block
37 virtual addresses that contain 0xa in bits 63-60.
58 - Version tag values of 0x0 and 0xf are reserved. These values match any
61 - Version tags are set on virtual addresses from userspace even though
66 - When a task frees a memory page it had set version tags on, the page
67 goes back to free page pool. When this page is re-allocated to a task,
73 - ADI tag mismatches are not detected for non-faulting loads.
75 - Kernel does not set any tags for user pages and it is entirely a
77 version tags are preserved if a page is swapped out to the disk and
78 swapped back in. It also preserves that version tags if a page is
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