Eric Lee / smarc-ti-linux-kernel

24 Aug, 2013

1 commit

  • ee8a99bdb   lib/lz4: correct the LZ4 license ... Browse Code »

    The LZ4 code is listed as using the "BSD 2-Clause License".

    Signed-off-by: Richard Laager
    Acked-by: Kyungsik Lee
    Cc: Chanho Min
    Cc: Richard Yao
    Signed-off-by: Andrew Morton
    [ The 2-clause BSD can be just converted into GPL, but that's rude and
    pointless, so don't do it - Linus ]
    Signed-off-by: Linus Torvalds

    Richard Laager
     

10 Jul, 2013

1 commit

  • c72ac7a1a   lib: add lz4 compressor module ... Browse Code »

    This patchset is for supporting LZ4 compression and the crypto API using
    it.

    As shown below, the size of data is a little bit bigger but compressing
    speed is faster under the enabled unaligned memory access. We can use
    lz4 de/compression through crypto API as well. Also, It will be useful
    for another potential user of lz4 compression.

    lz4 Compression Benchmark:
    Compiler: ARM gcc 4.6.4
    ARMv7, 1 GHz based board
    Kernel: linux 3.4
    Uncompressed data Size: 101 MB
    Compressed Size compression Speed
    LZO 72.1MB 32.1MB/s, 33.0MB/s(UA)
    LZ4 75.1MB 30.4MB/s, 35.9MB/s(UA)
    LZ4HC 59.8MB 2.4MB/s, 2.5MB/s(UA)
    - UA: Unaligned memory Access support
    - Latest patch set for LZO applied

    This patch:

    Add support for LZ4 compression in the Linux Kernel. LZ4 Compression APIs
    for kernel are based on LZ4 implementation by Yann Collet and were changed
    for kernel coding style.

    LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
    LZ4 source repository : http://code.google.com/p/lz4/
    svn revision : r90

    Two APIs are added:

    lz4_compress() support basic lz4 compression whereas lz4hc_compress()
    support high compression or CPU performance get lower but compression
    ratio get higher. Also, we require the pre-allocated working memory with
    the defined size and destination buffer must be allocated with the size of
    lz4_compressbound.

    [akpm@linux-foundation.org: make lz4_compresshcctx() static]
    Signed-off-by: Chanho Min
    Cc: "Darrick J. Wong"
    Cc: Bob Pearson
    Cc: Richard Weinberger
    Cc: Herbert Xu
    Cc: Yann Collet
    Cc: Kyungsik Lee
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Chanho Min