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/linux/Documentation/admin-guide/mm/
A Dzswap.rst10 Zswap is a lightweight compressed cache for swap pages. It takes pages that are
14 significant performance improvement if reads from the compressed cache are
34 Zswap evicts pages from compressed cache on an LRU basis to the backing swap
50 back into memory all of the pages stored in the compressed pool. The
51 pages stored in zswap will remain in the compressed pool until they are
53 pages out of the compressed pool, a swapoff on the swap device(s) will
55 compressed pool.
62 the backing swap device in the case that the compressed pool is full.
67 accessed. The compressed memory pool grows on demand and shrinks as compressed
78 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: $(obj)/compressed/vmlinux FORCE
16 $(obj)/compressed/vmlinux: FORCE
17 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
/linux/lib/xz/
A Dxz_dec_lzma2.c238 uint32_t compressed; member
913 s->lzma2.compressed -= s->rc.in_pos; in lzma2_lzma()
940 if (in_avail > s->lzma2.compressed) in lzma2_lzma()
943 s->lzma2.compressed -= in_avail; in lzma2_lzma()
949 if (in_avail > s->lzma2.compressed) in lzma2_lzma()
950 in_avail = s->lzma2.compressed; in lzma2_lzma()
1062 s->lzma2.compressed in xz_dec_lzma2_run()
1068 s->lzma2.compressed in xz_dec_lzma2_run()
1122 < s->lzma2.compressed)) { in xz_dec_lzma2_run()
1130 if (s->lzma2.compressed > 0) in xz_dec_lzma2_run()
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A Dxz_dec_stream.c66 vli_type compressed; member
81 vli_type compressed; member
239 if (s->block.compressed > s->block_header.compressed in dec_block()
250 && s->block_header.compressed in dec_block()
251 != s->block.compressed) in dec_block()
260 + s->block.compressed; in dec_block()
481 s->block_header.compressed = s->vli; in dec_block_header()
483 s->block_header.compressed = VLI_UNKNOWN; in dec_block_header()
543 s->block.compressed = 0; in dec_block_header()
642 while (s->block.compressed & 3) { in dec_main()
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/linux/arch/h8300/boot/
A DMakefile5 subdir- := compressed
18 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
21 $(obj)/compressed/vmlinux: FORCE
22 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
/linux/arch/s390/boot/
A DMakefile45 subdir- := compressed
62 $(obj)/bzImage: $(obj)/compressed/vmlinux $(obj)/section_cmp.boot.data $(obj)/section_cmp.boot.pres…
65 $(obj)/section_cmp%: vmlinux $(obj)/compressed/vmlinux FORCE
68 $(obj)/compressed/vmlinux: $(obj)/startup.a FORCE
69 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
/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--
/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
115 Metadata (inodes and directories) are compressed in 8Kbyte blocks. Each
118 or if the compressed block was larger than the uncompressed block.
146 compressed metadata block, and therefore, can share the start block.
169 compressed fragment block (tail-end packed block). The compressed size
188 location on disk and compressed size using a fragment lookup table. This
189 fragment lookup table is itself stored compressed into metadata blocks.
199 stored compressed into metadata blocks. A second index table is used to
232 The xattr lists are packed into compressed 8K metadata blocks.
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A Derofs.rst81 readahead Cache the last incomplete compressed physical
84 compressed physical clusters;
85 readaround Cache the both ends of incomplete compressed
88 for the rest compressed physical clusters.
235 compressed data blocks from variable-sized input in contrast to other existing
242 extents and in the meanwhile, compressed into physical clusters (pclusters).
264 A physical cluster can be seen as a container of physical compressed blocks
265 which contains compressed data. Previously, only lcluster-sized (4KB) pclusters
270 starts and blkaddr is used to seek the compressed data. For each NONHEAD
277 well. Let the delta0 of the first NONHEAD lcluster store the compressed block
/linux/fs/squashfs/
A Dblock.c146 int compressed; in squashfs_read_data() local
154 compressed = SQUASHFS_COMPRESSED_BLOCK(length); in squashfs_read_data()
157 index, compressed ? "" : "un", length, output->length); in squashfs_read_data()
194 compressed = SQUASHFS_COMPRESSED(length); in squashfs_read_data()
199 compressed ? "" : "un", length); in squashfs_read_data()
214 if (compressed) { in squashfs_read_data()
A DKconfig7 Read-Only File System). Squashfs is a highly compressed read-only
112 bool "Include support for ZLIB compressed file systems"
125 bool "Include support for LZ4 compressed file systems"
130 compressed with LZ4 compression. LZ4 compression is mainly
140 bool "Include support for LZO compressed file systems"
145 compressed with LZO compression. LZO compression is mainly
155 bool "Include support for XZ compressed file systems"
160 compressed with XZ compression. XZ gives better compression than
170 bool "Include support for ZSTD compressed file systems"
175 compressed with ZSTD compression. ZSTD gives better compression than
/linux/arch/arm/boot/
A DMakefile63 $(obj)/compressed/vmlinux: $(obj)/Image FORCE
64 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
66 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
106 subdir- := bootp compressed dts
/linux/arch/x86/boot/
A Dheader.S458 # a gzip-compressed kernel as example, to illustrate it:
460 # The file layout of gzip compressed kernel is:
468 # compressed data blocks[N]
496 # compressed data is placed at the end of the buffer. The output pointer
498 # where the compressed data starts. Problems will occur when the output
503 # triggered by data whose compressed form is larger than the uncompressed
506 # The worst case at the block level is a growth of the compressed data
509 # The worst case internal to a compressed block is very hard to figure.
519 # block will stop the byte before the compressed data for a block begins.
520 # To avoid problems with the compressed data's meta information an extra 18
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A DMakefile33 subdir- := compressed
88 $(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
99 $(obj)/zoffset.h: $(obj)/compressed/vmlinux FORCE
114 $(obj)/compressed/vmlinux: FORCE
115 $(Q)$(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.c61 size_t ret, size, compressed = 0; in zstd_compress_stream_to_records() local
69 compressed += size; in zstd_compress_stream_to_records()
84 compressed += size; in zstd_compress_stream_to_records()
89 return compressed; in zstd_compress_stream_to_records()
/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 $@
/linux/Documentation/vm/
A Dz3fold.rst7 z3fold is a special purpose allocator for storing compressed pages.
8 It is designed to store up to three compressed pages per physical page.
15 * z3fold can hold up to 3 compressed pages in its page
20 stores an integral number of compressed pages per page, but it can store
/linux/scripts/
A Dremove-stale-files29 rm -f arch/arm/boot/compressed/${f}
34 rm -f arch/mips/boot/compressed/${f}
/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/ia64/
A DMakefile53 PHONY += compressed check
55 all: compressed unwcheck
57 compressed: vmlinux.gz target
/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 ::
297 compressed data interface will be considered as regular ALSA devices;
302 manner, no matter if the input was PCM or compressed.
315 - No notion of underrun/overrun. Since the bytes written are compressed
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/linux/drivers/gpu/drm/nouveau/include/nvfw/
A Dls.h35 u32 compressed; member
48 u32 compressed; member
/linux/arch/mips/
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.

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