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/linux/Documentation/admin-guide/mm/
H 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
27 device when the compressed pool reaches its size limit. This requirement had
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.
53 evict pages from its own compressed pool on an LRU basis and write them back to
54 the backing swap device in the case that the compressed pool is full.
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/linux/arch/parisc/boot/
H 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/
H A Dxz_dec_lzma2.c237 uint32_t compressed; member
884 if (s->temp.size > 0 || s->lzma2.compressed == 0) { in lzma2_lzma()
886 if (tmp > s->lzma2.compressed - s->temp.size) in lzma2_lzma()
887 tmp = s->lzma2.compressed - s->temp.size; in lzma2_lzma()
893 if (s->temp.size + tmp == s->lzma2.compressed) { in lzma2_lzma()
912 s->lzma2.compressed -= s->rc.in_pos; in lzma2_lzma()
930 if (in_avail >= s->lzma2.compressed + LZMA_IN_REQUIRED) in lzma2_lzma()
931 s->rc.in_limit = b->in_pos + s->lzma2.compressed; in lzma2_lzma()
939 if (in_avail > s->lzma2.compressed) in lzma2_lzma()
942 s->lzma2.compressed -= in_avail; in lzma2_lzma()
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H A Dxz_dec_stream.c65 vli_type compressed; member
80 vli_type compressed; member
231 s->block.compressed += b->in_pos - s->in_start; in dec_block()
238 if (s->block.compressed > s->block_header.compressed in dec_block()
248 if (s->block_header.compressed != VLI_UNKNOWN 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()
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/linux/Documentation/networking/
H 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/
H A Dfourcc.rst20 - b: raw bayer, DPCM compressed
21 - a: A-law compressed
22 - u: u-law compressed
33 4th character: compressed bits-per-pixel 0--9, A--
H A Dpixfmt-srggb10alaw8.rst16 10-bit Bayer formats compressed to 8 bits
23 color compressed to 8 bits each, using the A-LAW algorithm. Each color
H A Dpixfmt-srggb10dpcm8.rst19 10-bit Bayer formats compressed to 8 bits
26 colour compressed to 8 bits each, using DPCM compression. DPCM,
/linux/arch/arm/boot/
H 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/sh/boot/
H 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/arch/x86/boot/
H A Dheader.S405 # a gzip-compressed kernel as example, to illustrate it:
407 # The file layout of gzip compressed kernel is:
415 # compressed data blocks[N]
443 # compressed data is placed at the end of the buffer. The output pointer
445 # where the compressed data starts. Problems will occur when the output
450 # triggered by data whose compressed form is larger than the uncompressed
453 # The worst case at the block level is a growth of the compressed data
456 # The worst case internal to a compressed block is very hard to figure.
466 # block will stop the byte before the compressed data for a block begins.
467 # To avoid problems with the compressed data's meta information an extra 18
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H A DMakefile21 subdir- := compressed
69 $(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
80 $(obj)/zoffset.h: $(obj)/compressed/vmlinux FORCE
95 $(obj)/compressed/vmlinux: FORCE
96 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
/linux/arch/nios2/boot/
H A DMakefile27 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
31 $(obj)/compressed/vmlinux: $(obj)/vmlinux.gz FORCE
32 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
/linux/tools/perf/util/
H 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/fs/squashfs/
H A DKconfig7 Read-Only File System). Squashfs is a highly compressed read-only
153 bool "Enable full caching of compressed blocks"
157 This option enables caching of all compressed blocks, Without caching,
166 caching all compressed blocks in the page cache, reducing disk I/O for
174 bool "Include support for ZLIB compressed file systems"
187 bool "Include support for LZ4 compressed file systems"
192 compressed with LZ4 compression. LZ4 compression is mainly
202 bool "Include support for LZO compressed file systems"
207 compressed with LZO compression. LZO compression is mainly
217 bool "Include support for XZ compressed file systems"
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/linux/drivers/firmware/efi/
H 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/
H A DKconfig29 page cache for compressed data using proper strategies, which is
113 bool "EROFS LZMA compressed data support"
117 containing LZMA compressed data, specifically called microLZMA. It
124 bool "EROFS DEFLATE compressed data support"
128 containing DEFLATE compressed data. It gives better compression
138 bool "EROFS Zstandard compressed data support"
142 containing Zstandard compressed data. It gives better compression
156 EROFS file systems containing compressed data. It gives better
/linux/Documentation/ABI/testing/
H A Dsysfs-fs-erofs25 compressed folios:
27 - 1 : invalidate cached compressed folios
29 - 3 : drop in-memory pclusters and cached compressed folios
/linux/usr/
H 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/Documentation/sound/designs/
H 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 ::
214 difficult to reach with all types of compressed data, but works fine with most
298 compressed data interface will be considered as regular ALSA devices;
303 manner, no matter if the input was PCM or compressed.
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/linux/arch/parisc/boot/compressed/
H A Dvmlinux.lds.S47 .rodata.compressed : {
48 *(.rodata.compressed)
/linux/arch/mips/boot/compressed/
H A Dld.script2 * ld.script for compressed kernel support of MIPS
27 /* Put the compressed image here */
/linux/arch/mips/
H A DKconfig.debug83 bool "Enable compressed kernel support debugging"
87 If you want to add compressed kernel support to a new board, and the
95 arch/mips/boot/compressed/uart-16550.c does.
97 After the compressed kernel support works, please disable this option
102 int "UART to use for compressed kernel debugging"
107 Specify the UART that should be used for compressed kernel debugging.
/linux/arch/x86/boot/compressed/
H A Dvmlinux.lds.S30 .rodata..compressed : {
31 *(.rodata..compressed)
/linux/Documentation/driver-api/cxl/allocation/
H A Dreclaim.rst39 processor for the new pages being compressed. Since pages being compressed
43 In Linux v6.XX, ZSwap tries to prefer the node of the page being compressed

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