| /Linux-v6.1/Documentation/mm/ |
| D | frontswap.rst | 7 Frontswap provides a "transcendent memory" interface for swap pages.
9 swapped pages are saved in RAM (or a RAM-like device) instead of a swap disk.
14 a "backing" store for a swap device. The storage is assumed to be
25 with the specified swap device number (aka "type"). A "store" will
31 associated with the swap type (e.g., like swapoff) and notify the "device"
32 to refuse further stores with that swap type.
36 to swap out a page, it first attempts to use frontswap. If the store returns
40 page can be written to swap as usual.
49 frontswap can be measured (across all swap devices) with:
72 providing a clean, dynamic interface to read and write swap pages to
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| /Linux-v6.1/Documentation/power/ |
| D | swsusp-and-swap-files.rst | 2 Using swap files with software suspend (swsusp)
7 The Linux kernel handles swap files almost in the same way as it handles swap
8 partitions and there are only two differences between these two types of swap
10 (1) swap files need not be contiguous,
11 (2) the header of a swap file is not in the first block of the partition that
13 already taken care of by the swap-handling code, but (2) has to be taken into
16 In principle the location of a swap file's header may be determined with the
18 filesystem holding the swap file to be mounted, and if this filesystem is
20 identify a swap file swsusp uses the name of the partition that holds the file
21 and the offset from the beginning of the partition at which the swap file's
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| D | swsusp.rst | 2 Swap suspend
34 Swap partition:
38 Swap file:
51 - If you would like to write hibernation image to swap and then suspend
102 powerdowns. You must explicitly specify the swap partition to resume from with
185 encryption) and arbitrary backends for writing the image (eg to swap
224 * SUSPEND all but swap device and parents
227 * SUSPEND swap device and parents
230 Oh no, that does not work, if swap device or its parents uses DMA,
233 * SUSPEND all but swap device and parents
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| D | userland-swsusp.rst | 76 return the amount of available swap in bytes
81 allocate a swap page from the resume partition
83 will contain the swap page offset if the call is successful)
86 free all swap pages allocated by
91 units) from the beginning of the partition at which the swap header is
94 containing the resume device specification and the offset); for swap
96 swap files (see Documentation/power/swsusp-and-swap-files.rst for
130 and all swap pages allocated with SNAPSHOT_ALLOC_SWAP_PAGE (if any).
137 snapshot image from/to the kernel will use a swap partition, called the resume
138 partition, or a swap file as storage space (if a swap file is used, the resume
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| D | swsusp-dmcrypt.rst | 17 the swap device(s) and the boot partition which may contain a mini
21 At this point you want to encrypt your swap, too. Still you want to
27 swap device.
30 a way that the swap device you suspend to/resume from has
33 to always set up this swap device first with dmsetup, so that
56 card contains at least the encrypted swap setup in a file
67 initrd that allows you to resume from encrypted swap and that
126 pcmcia flash disk. If this succeeds we need to reset the swap
133 Otherwise we just remove the encrypted swap device and leave it to the
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| /Linux-v6.1/Documentation/admin-guide/mm/ |
| D | swap_numa.rst | 4 Automatically bind swap device to numa node
7 If the system has more than one swap device and swap device has the node
8 information, we can make use of this information to decide which swap
15 Swap device has priority and that decides the order of it to be used. To make
17 for swap devices. e.g. on a 2 node machine, assume 2 swap devices swapA and
24 Then node 0 will use the two swap devices in the order of swapA then swapB and
25 node 1 will use the two swap devices in the order of swapB then swapA. Note
28 A more complex example on a 4 node machine. Assume 6 swap devices are going to
31 The way to swap them on is the same as above::
44 swapA and swapB will be used in a round robin mode before any other swap device.
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| D | zswap.rst | 10 Zswap is a lightweight compressed cache for swap pages. It takes pages that are
13 for potentially reduced swap I/O. This trade-off can also result in a
15 faster than reads from a swap device.
28 dramatically reduce their swap I/O pressure, avoiding heavy handed I/O
31 * Users with SSDs as swap devices can extend the life of the device by
34 Zswap evicts pages from compressed cache on an LRU basis to the backing swap
53 pages out of the compressed pool, a swapoff on the swap device(s) will
62 the backing swap device in the case that the compressed pool is full.
83 When a swap page is passed from frontswap to zswap, zswap maintains a mapping
84 of the swap entry, a combination of the swap type and swap offset, to the zpool
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| /Linux-v6.1/mm/ |
| D | swap_state.c | 6 * Swap reorganised 29.12.95, Stephen Tweedie
13 #include <linux/swap.h>
26 #include "swap.h"
66 printk("%lu pages in swap cache\n", total_swapcache_pages()); in show_swap_cache_info()
67 printk("Free swap = %ldkB\n", in show_swap_cache_info()
69 printk("Total swap = %lukB\n", total_swap_pages << (PAGE_SHIFT - 10)); in show_swap_cache_info()
137 * been verified to be in the swap cache.
165 * add_to_swap - allocate swap space for a folio
166 * @folio: folio we want to move to swap
168 * Allocate swap space for the folio and add the folio to the
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| D | swapfile.c | 6 * Swap reorganised 29.12.95, Stephen Tweedie
17 #include <linux/swap.h>
48 #include "swap.h"
58 * Some modules use swappable objects and may try to swap them out under
60 * check to see if any swap space is available.
71 static const char Bad_file[] = "Bad swap file entry ";
72 static const char Unused_file[] = "Unused swap file entry ";
73 static const char Bad_offset[] = "Bad swap offset entry ";
74 static const char Unused_offset[] = "Unused swap offset entry ";
120 /* Reclaim the swap entry anyway if possible */
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| D | swap_slots.c | 3 * Manage cache of swap slots to be used for and returned from
4 * swap.
10 * We allocate the swap slots from the global pool and put
21 * The swap entry allocated is marked with SWAP_HAS_CACHE
25 * The swap slots cache is protected by a mutex instead of
43 /* Serialize swap slots cache enable/disable operations */
207 * a swap device; in __drain_swap_slots_cache()
208 * 2) disabling of swap slot cache, when we run low in __drain_swap_slots_cache()
209 * on swap slots when allocating memory and need in __drain_swap_slots_cache()
210 * to return swap slots to global pool. in __drain_swap_slots_cache()
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| /Linux-v6.1/scripts/coccinelle/misc/ |
| D | swap.cocci | 3 /// Check for opencoded swap() implementation.
9 // Keywords: swap
64 + swap(a, b)
76 + swap(a, b)
85 swap(...);
90 swap(...);
95 swap(...);
104 coccilib.report.print_report(p[0], "WARNING opportunity for swap()")
110 coccilib.org.print_todo(p[0], "WARNING opportunity for swap()")
116 coccilib.report.print_report(p[0], "WARNING opportunity for swap()")
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| /Linux-v6.1/include/linux/ |
| D | swap.h | 25 #define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */
28 #define SWAP_FLAG_DISCARD 0x10000 /* enable discard for swap */
29 #define SWAP_FLAG_DISCARD_ONCE 0x20000 /* discard swap area at swapon-time */
44 * be swapped to. The swap type and the offset into that swap type are
53 * Use some of the swap files numbers for other purposes. This
131 * Magic header for a swap area. The first part of the union is
132 * what the swap magic looks like for the old (limited to 128MB)
133 * swap area format, the second part of the union adds - in the
137 * Having the magic at the end of the PAGE_SIZE makes detecting swap
145 char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */
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| /Linux-v6.1/Documentation/ABI/testing/ |
| D | sysfs-kernel-mm-swap | 1 What: /sys/kernel/mm/swap/
6 What: /sys/kernel/mm/swap/vma_ra_enabled
9 Description: Enable/disable VMA based swap readahead.
11 If set to true, the VMA based swap readahead algorithm
13 VMA, and the global swap readahead algorithm will be
15 false, the global swap readahead algorithm will be
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| /Linux-v6.1/arch/arm/vdso/ |
| D | vdsomunge.c | 101 static Elf32_Word read_elf_word(Elf32_Word word, bool swap) in read_elf_word() argument
103 return swap ? swab32(word) : word; in read_elf_word()
106 static Elf32_Half read_elf_half(Elf32_Half half, bool swap) in read_elf_half() argument
108 return swap ? swab16(half) : half; in read_elf_half()
111 static void write_elf_word(Elf32_Word val, Elf32_Word *dst, bool swap) in write_elf_word() argument
113 *dst = swap ? swab32(val) : val; in write_elf_word()
125 bool swap; in main() local
159 swap = inhdr->e_ident[EI_DATA] != HOST_ORDER; in main()
161 if (read_elf_half(inhdr->e_type, swap) != ET_DYN) in main()
164 if (read_elf_half(inhdr->e_machine, swap) != EM_ARM) in main()
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| /Linux-v6.1/drivers/net/wireless/ath/ath10k/ |
| D | swap.c | 6 /* This file has implementation for code swap logic. With code swap feature,
28 /* Parse swap bin and copy the content to host allocated memory. in ath10k_swap_code_seg_fill()
47 ath10k_err(ar, "refusing an invalid swap file\n"); in ath10k_swap_code_seg_fill()
64 ath10k_err(ar, "failed to parse invalid swap file\n"); in ath10k_swap_code_seg_fill()
98 ath10k_err(ar, "refusing code swap bin because it is too big %zu > %d\n", in ath10k_swap_code_seg_alloc()
133 ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot found firmware code swap binary\n"); in ath10k_swap_code_seg_configure()
141 ath10k_err(ar, "failed to write Code swap segment information (%d)\n", in ath10k_swap_code_seg_configure()
178 ath10k_err(ar, "failed to allocate fw code swap segment\n"); in ath10k_swap_code_seg_init()
186 ath10k_warn(ar, "failed to initialize fw code swap segment: %d\n", in ath10k_swap_code_seg_init()
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| /Linux-v6.1/lib/ |
| D | sort.c | 45 * swap_words_32 - swap two elements in 32-bit chunks
46 * @a: pointer to the first element to swap
47 * @b: pointer to the second element to swap
68 * swap_words_64 - swap two elements in 64-bit chunks
69 * @a: pointer to the first element to swap
70 * @b: pointer to the second element to swap
104 * swap_bytes - swap two elements a byte at a time
105 * @a: pointer to the first element to swap
106 * @b: pointer to the second element to swap
132 swap_func_t swap; member
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| /Linux-v6.1/kernel/power/ |
| D | user.c | 16 #include <linux/swap.h>
33 int swap; member
74 data->swap = swap_type_of(swsusp_resume_device, 0); in snapshot_open()
85 data->swap = -1; in snapshot_open()
117 free_all_swap_pages(data->swap); in snapshot_release()
242 data->swap = swap_type_of(swdev, offset); in snapshot_set_swap_area()
243 if (data->swap < 0) in snapshot_set_swap_area()
359 size = count_swap_pages(data->swap, 1); in snapshot_ioctl()
365 if (data->swap < 0 || data->swap >= MAX_SWAPFILES) { in snapshot_ioctl()
369 offset = alloc_swapdev_block(data->swap); in snapshot_ioctl()
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| /Linux-v6.1/Documentation/admin-guide/cgroup-v1/ |
| D | memory.rst | 46 - accounting anonymous pages, file caches, swap caches usage and limiting them.
48 - optionally, memory+swap usage can be accounted and limited.
70 memory.memsw.usage_in_bytes show current usage for memory+Swap
73 memory.memsw.limit_in_bytes set/show limit of memory+Swap usage
75 memory.memsw.failcnt show the number of memory+Swap hits limits
77 memory.memsw.max_usage_in_bytes show max memory+Swap usage recorded
207 Since page's memcg recorded into swap whatever memsw enabled, the page will
227 2.4 Swap Extension
230 Swap usage is always recorded for each of cgroup. Swap Extension allows you to
238 memsw means memory+swap. Usage of memory+swap is limited by
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| D | memcg_test.rst | 47 Called when swp_entry's refcnt goes down to 0. A charge against swap
74 4.1 Swap-in.
75 At swap-in, the page is taken from swap-cache. There are 2 cases.
81 4.2 Swap-out.
82 At swap-out, typical state transition is below.
84 (a) add to swap cache. (marked as SwapCache)
88 (c) write back to swap.
89 (d) delete from swap cache. (remove from SwapCache)
121 - Both on radix-tree and SwapCache. This happens at swap-in
122 and swap-out,
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| /Linux-v6.1/drivers/gpu/drm/xlnx/ |
| D | zynqmp_disp.c | 83 * @swap: Flag to swap R & B for RGB formats, and U & V for YUV formats
90 bool swap; member
244 .swap = true,
249 .swap = false,
254 .swap = false,
259 .swap = true,
264 .swap = false,
269 .swap = true,
274 .swap = false,
279 .swap = true,
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| /Linux-v6.1/arch/sh/include/mach-se/mach/ |
| D | mrshpc.h | 25 /* common mode & bus width 16bit SWAP = 1*/ in mrshpc_setup_windows()
28 /* common mode & bus width 16bit SWAP = 0*/ in mrshpc_setup_windows()
34 /* attribute mode & bus width 16bit SWAP = 1*/ in mrshpc_setup_windows()
37 /* attribute mode & bus width 16bit SWAP = 0*/ in mrshpc_setup_windows()
44 __raw_writew(0x0a00, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 1*/ in mrshpc_setup_windows()
46 __raw_writew(0x0200, MRSHPC_IOWCR2); /* bus width 16bit SWAP = 0*/ in mrshpc_setup_windows()
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| /Linux-v6.1/fs/iomap/ |
| D | swapfile.c | 10 #include <linux/swap.h>
25 * Collect physical extents for this swap file. Physical extents reported to
26 * the swap code must be trimmed to align to a page boundary. The logical
28 * page numbers of the swap device to the physical page-aligned extents.
59 * Calculate how much swap space we're adding; the first page contains in iomap_swapfile_add_extent()
60 * the swap header and doesn't count. The mm still wants that first in iomap_swapfile_add_extent()
93 * Accumulate iomaps for this swap file. We have to accumulate iomaps because
94 * swap only cares about contiguous page-aligned physical extents and makes no
118 /* Only one bdev per swap file. */ in iomap_swapfile_iter()
139 * Iterate a swap file's iomaps to construct physical extents that can be
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| /Linux-v6.1/include/linux/mtd/ |
| D | cfi_endian.h | 29 #define cpu_to_cfi16(map, x) _cpu_to_cfi(16, (map)->swap, (x))
30 #define cpu_to_cfi32(map, x) _cpu_to_cfi(32, (map)->swap, (x))
31 #define cpu_to_cfi64(map, x) _cpu_to_cfi(64, (map)->swap, (x))
32 #define cfi16_to_cpu(map, x) _cfi_to_cpu(16, (map)->swap, (x))
33 #define cfi32_to_cpu(map, x) _cfi_to_cpu(32, (map)->swap, (x))
34 #define cfi64_to_cpu(map, x) _cfi_to_cpu(64, (map)->swap, (x))
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| /Linux-v6.1/arch/csky/abiv1/inc/abi/ |
| D | pgtable-bits.h | 29 * Encode and decode a swap entry
31 * Format of swap PTE:
34 * bit 2 - 5: swap type[0 - 3]
37 * bit 8: swap type[4]
38 * bit 9 - 31: swap offset
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| /Linux-v6.1/arch/hexagon/include/asm/ |
| D | pgtable.h | 41 * To make nonlinear swap work according to the more recent
43 * the PTE describes MMU programming or swap space.
332 /* __pte_to_swp_entry - extract swap entry from PTE */
335 /* __swp_entry_to_pte - extract PTE from swap entry */
362 * Swap/file PTE definitions. If _PAGE_PRESENT is zero, the rest of the PTE is
363 * interpreted as swap information. The remaining free bits are interpreted as
364 * swap type/offset tuple. Rather than have the TLB fill handler test
366 * all zeros for swap entries, which speeds up the miss handler at the cost of
369 * and not much swap space.
371 * Format of swap PTE:
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