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/linux/Documentation/admin-guide/mm/
A Dzswap.rst8 Zswap is a lightweight compressed cache for swap pages. It takes pages that are
12 significant performance improvement if reads from the compressed cache are
26 Zswap evicts pages from compressed cache on an LRU basis to the backing swap
42 back into memory all of the pages stored in the compressed pool. The
43 pages stored in zswap will remain in the compressed pool until they are
45 pages out of the compressed pool, a swapoff on the swap device(s) will
47 compressed pool.
54 the backing swap device in the case that the compressed pool is full.
59 accessed. The compressed memory pool grows on demand and shrinks as compressed
70 zbud pages). The zsmalloc type zpool has a more complex compressed page
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/linux/arch/parisc/boot/
A DMakefile8 subdir- := compressed
13 $(obj)/bzImage: $(if $(CONFIG_KERNEL_UNCOMPRESSED),$(objtree)/vmlinux,$(obj)/compressed/vmlinux) FO…
16 $(obj)/compressed/vmlinux: FORCE
17 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
/linux/lib/xz/
A Dxz_dec_lzma2.c237 uint32_t compressed; member
912 s->lzma2.compressed -= s->rc.in_pos; in lzma2_lzma()
939 if (in_avail > s->lzma2.compressed) in lzma2_lzma()
942 s->lzma2.compressed -= in_avail; in lzma2_lzma()
948 if (in_avail > s->lzma2.compressed) in lzma2_lzma()
949 in_avail = s->lzma2.compressed; in lzma2_lzma()
1060 s->lzma2.compressed in xz_dec_lzma2_run()
1066 s->lzma2.compressed in xz_dec_lzma2_run()
1120 < s->lzma2.compressed)) { in xz_dec_lzma2_run()
1128 if (s->lzma2.compressed > 0) in xz_dec_lzma2_run()
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A Dxz_dec_stream.c65 vli_type compressed; member
80 vli_type compressed; member
238 if (s->block.compressed > s->block_header.compressed in dec_block()
249 && s->block_header.compressed in dec_block()
250 != s->block.compressed) in dec_block()
259 + s->block.compressed; in dec_block()
480 s->block_header.compressed = s->vli; in dec_block_header()
482 s->block_header.compressed = VLI_UNKNOWN; in dec_block_header()
542 s->block.compressed = 0; in dec_block_header()
641 while (s->block.compressed & 3) { in dec_main()
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/linux/Documentation/networking/
A Dipsec.rst12 Small IP packet won't get compressed at sender, and failed on
19 If the total size of a compressed payload and the IPComp header, as
21 payload, the IP datagram MUST be sent in the original non-compressed
22 form. To clarify: If an IP datagram is sent non-compressed, no
36 when sending non-compressed packet to the peer (whether or not packet len
37 is smaller than the threshold or the compressed len is larger than original
/linux/Documentation/userspace-api/media/v4l/
A Dfourcc.rst19 - b: raw bayer, DPCM compressed
20 - a: A-law compressed
21 - u: u-law compressed
32 4th character: compressed bits-per-pixel 0--9, A--
A Dpixfmt-srggb10alaw8.rst15 10-bit Bayer formats compressed to 8 bits
22 color compressed to 8 bits each, using the A-LAW algorithm. Each color
A Dpixfmt-srggb10dpcm8.rst18 10-bit Bayer formats compressed to 8 bits
25 colour compressed to 8 bits each, using DPCM compression. DPCM,
/linux/arch/arm/boot/
A DMakefile56 $(obj)/compressed/vmlinux: $(obj)/Image FORCE
57 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
59 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
92 subdir- := bootp compressed dts
/linux/arch/nios2/boot/
A DMakefile27 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
31 $(obj)/compressed/vmlinux: $(obj)/vmlinux.gz FORCE
32 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
/linux/arch/x86/boot/
A Dheader.S396 # a gzip-compressed kernel as example, to illustrate it:
398 # The file layout of gzip compressed kernel is:
406 # compressed data blocks[N]
434 # compressed data is placed at the end of the buffer. The output pointer
436 # where the compressed data starts. Problems will occur when the output
441 # triggered by data whose compressed form is larger than the uncompressed
444 # The worst case at the block level is a growth of the compressed data
447 # The worst case internal to a compressed block is very hard to figure.
457 # block will stop the byte before the compressed data for a block begins.
458 # To avoid problems with the compressed data's meta information an extra 18
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A DMakefile21 subdir- := compressed
73 $(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
84 $(obj)/zoffset.h: $(obj)/compressed/vmlinux FORCE
99 $(obj)/compressed/vmlinux: FORCE
100 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
/linux/arch/sh/boot/
A DMakefile33 subdir- := compressed romimage
35 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
39 $(obj)/compressed/vmlinux: FORCE
40 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
102 $(obj)/vmlinux.srec: $(obj)/compressed/vmlinux FORCE
/linux/tools/perf/util/
A Dzstd.c35 size_t ret, size, compressed = 0; in zstd_compress_stream_to_records() local
58 compressed += size; in zstd_compress_stream_to_records()
73 compressed += size; in zstd_compress_stream_to_records()
78 return compressed; in zstd_compress_stream_to_records()
/linux/Documentation/mm/
A Dz3fold.rst5 z3fold is a special purpose allocator for storing compressed pages.
6 It is designed to store up to three compressed pages per physical page.
13 * z3fold can hold up to 3 compressed pages in its page
18 stores an integral number of compressed pages per page, but it can store
/linux/Documentation/filesystems/
A Dsquashfs.rst7 Squashfs is a compressed read-only filesystem for Linux.
52 compressed inode is on average 8 bytes in length (the exact length varies on
175 Metadata (inodes and directories) are compressed in 8Kbyte blocks. Each
178 or if the compressed block was larger than the uncompressed block.
206 compressed metadata block, and therefore, can share the start block.
229 compressed fragment block (tail-end packed block). The compressed size
248 location on disk and compressed size using a fragment lookup table. This
249 fragment lookup table is itself stored compressed into metadata blocks.
259 stored compressed into metadata blocks. A second index table is used to
292 The xattr lists are packed into compressed 8K metadata blocks.
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A Derofs.rst67 addition, inplace decompression is also supported to avoid bounce compressed
70 - Support chunk-based data deduplication and rolling-hash compressed data
115 readahead Cache the last incomplete compressed physical
118 compressed physical clusters;
119 readaround Cache the both ends of incomplete compressed
122 for the rest compressed physical clusters.
319 extents and in the meanwhile, compressed into physical clusters (pclusters).
341 A physical cluster can be seen as a container of physical compressed blocks
347 starts and blkaddr is used to seek the compressed data. For each NONHEAD
354 well. Let the delta0 of the first NONHEAD lcluster store the compressed block
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/linux/fs/squashfs/
A Dblock.c268 int compressed; in squashfs_read_data() local
276 compressed = SQUASHFS_COMPRESSED_BLOCK(length); in squashfs_read_data()
279 index, compressed ? "" : "un", length, output->length); in squashfs_read_data()
317 compressed = SQUASHFS_COMPRESSED(length); in squashfs_read_data()
322 compressed ? "" : "un", length); in squashfs_read_data()
337 if (compressed) { in squashfs_read_data()
A DKconfig7 Read-Only File System). Squashfs is a highly compressed read-only
153 bool "Include support for ZLIB compressed file systems"
166 bool "Include support for LZ4 compressed file systems"
171 compressed with LZ4 compression. LZ4 compression is mainly
181 bool "Include support for LZO compressed file systems"
186 compressed with LZO compression. LZO compression is mainly
196 bool "Include support for XZ compressed file systems"
201 compressed with XZ compression. XZ gives better compression than
211 bool "Include support for ZSTD compressed file systems"
216 compressed with ZSTD compression. ZSTD gives better compression than
/linux/drivers/firmware/efi/
A Defi-pstore.c101 record->compressed = true; in efi_pstore_read_func()
103 record->compressed = false; in efi_pstore_read_func()
112 record->compressed = false; in efi_pstore_read_func()
126 record->compressed = false; in efi_pstore_read_func()
218 record->compressed ? 'C' : 'D'); in efi_pstore_write()
/linux/fs/erofs/
A DKconfig19 for compressed data temporarily with proper strategies, which is
105 bool "EROFS LZMA compressed data support"
111 containing LZMA compressed data, specifically called microLZMA. It
118 bool "EROFS DEFLATE compressed data support"
123 containing DEFLATE compressed data. It gives better compression
133 bool "EROFS Zstandard compressed data support"
138 containing Zstandard compressed data. It gives better compression
/linux/arch/parisc/boot/compressed/
A Dvmlinux.lds.S47 .rodata.compressed : {
48 *(.rodata.compressed)
/linux/usr/
A DKconfig56 bool "Support initial ramdisk/ramfs compressed using gzip"
64 bool "Support initial ramdisk/ramfs compressed using bzip2"
72 bool "Support initial ramdisk/ramfs compressed using LZMA"
80 bool "Support initial ramdisk/ramfs compressed using XZ"
88 bool "Support initial ramdisk/ramfs compressed using LZO"
96 bool "Support initial ramdisk/ramfs compressed using LZ4"
104 bool "Support initial ramdisk/ramfs compressed using ZSTD"
116 initramfs will be compressed. Several compression algorithms are
223 compressed at a later stage anyways along with the rest of the kernel,
/linux/arch/mips/boot/compressed/
A Dld.script2 * ld.script for compressed kernel support of MIPS
27 /* Put the compressed image here */
/linux/Documentation/sound/designs/
A Dcompress-offload.rst15 extend the existing API to compressed data streams.
19 codecs. Processing compressed data on such DSPs results in a dramatic
43 compressed data. Dedicated mechanisms are required to allow for
49 contrast, compressed data comes in a variety of formats. Audio DSPs
68 streaming compressed data to a DSP, with the assumption that the
72 have existing enums/structures for each compressed format. This new
157 The compressed audio stream state machine is described below ::
298 compressed data interface will be considered as regular ALSA devices;
303 manner, no matter if the input was PCM or compressed.
316 - No notion of underrun/overrun. Since the bytes written are compressed
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