| /linux/Documentation/mm/ |
| H A D | swap-table.rst | 6 Swap Table
9 Swap table implements swap cache as a per-cluster swap cache value array.
11 Swap Entry
14 A swap entry contains the information required to serve the anonymous page
17 Swap entry is encoded as two parts: swap type and swap offset.
19 The swap type indicates which swap device to use.
20 The swap offset is the offset of the swap file to read the page data from.
22 Swap Cache
25 Swap cache is a map to look up folios using swap entry as the key. The result
26 value can have three possible types depending on which stage of this swap entry
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| /linux/mm/ |
| H A D | swap.h | 8 #include <linux/swap.h> /* for MAX_SWAPFILES_SHIFT, struct swap_info_struct */
23 /* Swap table marker, 0x1 means shadow, 0x2 means PFN (SWP_TB_PFN_MARK) */
42 * We use this to track usage of a cluster. A cluster is a block of swap disk
54 * elements corresponding to the swap cluster.
59 atomic_long_t __rcu *table; /* Swap table entries, see mm/swap_table.h */
60 unsigned int *extend_table; /* For large swap count, protected by ci->lock */
62 struct swap_memcg_table *memcg_table; /* Swap table entries' cgroup record */
106 * valid, and protect the swap device with reference count or locks.
142 * Nothing modifies swap cache in an IRQ context. All access to in __swap_cluster_lock()
143 * swap cache is wrapped by swap_cache_* helpers, and swap cache in __swap_cluster_lock()
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| H A D | swap_state.c | 6 * Swap reorganised 29.12.95, Stephen Tweedie
14 #include <linux/swap.h>
29 #include "swap.h"
31 /* Swap readahead cluster size, as a power of 2 pages. */
76 printk("%lu pages in swap cache\n", total_swapcache_pages()); in show_swap_cache_info()
77 printk("Free swap = %ldkB\n", K(get_nr_swap_pages())); in show_swap_cache_info()
78 printk("Total swap = %lukB\n", K(total_swap_pages)); in show_swap_cache_info()
82 * swap_cache_get_folio - Looks up a folio in the swap cache.
83 * @entry: swap entry used for the lookup.
87 * Context: Caller must ensure @entry is valid and protect the swap device
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| H A D | swapfile.c | 6 * Swap reorganised 29.12.95, Stephen Tweedie
17 #include <linux/swap.h>
50 #include "swap.h"
61 * lazily allocated & freed swap device info struts, and SWP_USED indicates
70 * Some modules use swappable objects and may try to swap them out under
72 * check to see if any swap space is available.
83 static const char Bad_file[] = "Bad swap file entry ";
84 static const char Bad_offset[] = "Bad swap offset entry ";
148 * if one swap device is on the available plist, so the atomic can
166 /* Reclaim the swap entry anyway if possible */
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| H A D | page_io.c | 7 * Swap reorganised 29.12.95,
10 * Add swap of shared pages through the page cache. 20.2.1998. Stephen Tweedie
18 #include <linux/swap.h>
29 #include "swap.h"
201 * We may have stale swap cache pages in memory: notice
222 * Use the swap table zero mark to avoid doing IO for zero-filled in swap_writeout()
234 * swap entries. in swap_writeout()
322 struct swap_info_struct *sis = __swap_entry_to_info(folio->swap); in swap_can_merge()
334 struct swap_info_struct *sis = __swap_entry_to_info(folio->swap); in swap_add_folio()
390 * Return the count of contiguous swap entries that share the same
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| /linux/Documentation/power/ |
| H A 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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| H A 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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| H A 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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| H A 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/Documentation/admin-guide/mm/ |
| H A D | zswap.rst | 8 Zswap is a lightweight compressed cache for swap pages. It takes pages that are
11 for potentially reduced swap I/O. This trade-off can also result in a
13 faster than reads from a swap device.
20 dramatically reduce their swap I/O pressure, avoiding heavy handed I/O
23 * Users with SSDs as swap devices can extend the life of the device by
26 Zswap evicts pages from compressed cache on an LRU basis to the backing swap
45 pages out of the compressed pool, a swapoff on the swap device(s) will
52 Zswap receives pages for compression from the swap subsystem and is able to
54 the backing swap device in the case that the compressed pool is full.
62 When a swap page is passed from swapout to zswap, zswap maintains a mapping of
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| /linux/include/linux/ |
| H A D | swap.h | 19 #define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */
21 #define SWAP_FLAG_DISCARD 0x10000 /* enable discard for swap */
22 #define SWAP_FLAG_DISCARD_ONCE 0x20000 /* discard swap area at swapon-time */
36 * be swapped to. The swap type and the offset into that swap type are
45 * Use some of the swap files numbers for other purposes. This
114 * Magic header for a swap area. The first part of the union is
115 * what the swap magic looks like for the old (limited to 128MB)
116 * swap area format, the second part of the union adds - in the
120 * Having the magic at the end of the PAGE_SIZE makes detecting swap
128 char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */
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| /linux/scripts/coccinelle/misc/ |
| H A 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/arch/csky/abiv1/inc/abi/ |
| H A D | pgtable-bits.h | 13 /* We borrow bit 9 to store the exclusive marker in swap PTEs. */
32 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
35 * Format of swap PTE:
38 * bit 2 - 5: swap type[0 - 3]
41 * bit 8: swap type[4]
43 * bit 10 - 31: swap offset
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| /linux/arch/csky/abiv2/inc/abi/ |
| H A D | pgtable-bits.h | 13 /* We borrow bit 7 to store the exclusive marker in swap PTEs. */
32 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
35 * Format of swap PTE:
38 * bit 2 - 6: swap type
40 * bit 8: swap offset[0]
43 * bit 11 - 31: swap offset[1 - 21]
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| /linux/Documentation/ABI/testing/ |
| H A 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/arch/arm/vdso/ |
| H A 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/drivers/net/wireless/ath/ath10k/ |
| H A 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/lib/ |
| H A D | sort.c | 43 * swap_words_32 - swap two elements in 32-bit chunks
44 * @a: pointer to the first element to swap
45 * @b: pointer to the second element to swap
66 * swap_words_64 - swap two elements in 64-bit chunks
67 * @a: pointer to the first element to swap
68 * @b: pointer to the second element to swap
102 * swap_bytes - swap two elements a byte at a time
103 * @a: pointer to the first element to swap
104 * @b: pointer to the second element to swap
130 swap_func_t swap; member
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| /linux/Documentation/admin-guide/cgroup-v1/ |
| H A 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
226 Since page's memcg recorded into swap whatever memsw enabled, the page will
243 2.4 Swap Extension
246 Swap usage is always recorded for each of cgroup. Swap Extension allows you to
254 memsw means memory+swap. Usage of memory+swap is limited by
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| H A D | memcg_test.rst | 47 Called when swp_entry's refcnt goes down to 0. A charge against swap
72 4.1 Swap-in.
73 At swap-in, the page is taken from swap-cache. There are 2 cases.
79 4.2 Swap-out.
80 At swap-out, typical state transition is below.
82 (a) add to swap cache. (marked as SwapCache)
86 (c) write back to swap.
87 (d) delete from swap cache. (remove from SwapCache)
119 - Both on radix-tree and SwapCache. This happens at swap-in
120 and swap-out,
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| /linux/fs/iomap/ |
| H A D | swapfile.c | 7 #include <linux/swap.h>
22 * Collect physical extents for this swap file. Physical extents reported to
23 * the swap code must be trimmed to align to a page boundary. The logical
25 * page numbers of the swap device to the physical page-aligned extents.
56 * Calculate how much swap space we're adding; the first page contains in iomap_swapfile_add_extent()
57 * the swap header and doesn't count. The mm still wants that first in iomap_swapfile_add_extent()
90 * Accumulate iomaps for this swap file. We have to accumulate iomaps because
91 * swap only cares about contiguous page-aligned physical extents and makes no
115 /* Only one bdev per swap file. */ in iomap_swapfile_iter()
137 * Iterate a swap file's iomaps to construct physical extents that can be
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| /linux/arch/sh/include/mach-se/mach/ |
| H A 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/include/linux/mtd/ |
| H A 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/tools/mm/ |
| H A D | thp_swap_allocator_test.c | 6 * can correctly get swap slots to swap out as a whole instead of
7 * being split. It randomly releases swap entries through madvise
12 * swap device by:
63 * currently don't support large folios swap-in.
168 /* iterations with newly created mTHP, swap-in, and swap-out */ in main()
183 * since large folio swap-in isn't supported yet. Once we support in main()
184 * mTHP swap-in, we'll likely need to reduce MEMSIZE_MTHP and in main()
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| /linux/sound/soc/codecs/ |
| H A D | rt5665.c | 953 SOC_DAPM_ENUM("IF1_1 01 ADC Swap Mux", rt5665_if1_1_01_adc_enum);
956 SOC_DAPM_ENUM("IF1_1 23 ADC Swap Mux", rt5665_if1_1_23_adc_enum);
959 SOC_DAPM_ENUM("IF1_1 45 ADC Swap Mux", rt5665_if1_1_45_adc_enum);
962 SOC_DAPM_ENUM("IF1_1 67 ADC Swap Mux", rt5665_if1_1_67_adc_enum);
965 SOC_DAPM_ENUM("IF1_2 01 ADC Swap Mux", rt5665_if1_2_01_adc_enum);
968 SOC_DAPM_ENUM("IF1_2 23 ADC1 Swap Mux", rt5665_if1_2_23_adc_enum);
971 SOC_DAPM_ENUM("IF1_2 45 ADC1 Swap Mux", rt5665_if1_2_45_adc_enum);
974 SOC_DAPM_ENUM("IF1_2 67 ADC1 Swap Mux", rt5665_if1_2_67_adc_enum);
977 SOC_DAPM_ENUM("IF2_1 DAC Swap Source", rt5665_if2_1_dac_enum);
980 SOC_DAPM_ENUM("IF2_1 ADC Swap Sourc
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