Eric Lee / smarc-fsl-linux-kernel

23 Mar, 2011

1 commit

  • 565d76cb7   zlib: slim down zlib_deflate() workspace when possible ... Browse Code »

    Instead of always creating a huge (268K) deflate_workspace with the
    maximum compression parameters (windowBits=15, memLevel=8), allow the
    caller to obtain a smaller workspace by specifying smaller parameter
    values.

    For example, when capturing oops and panic reports to a medium with
    limited capacity, such as NVRAM, compression may be the only way to
    capture the whole report. In this case, a small workspace (24K works
    fine) is a win, whether you allocate the workspace when you need it (i.e.,
    during an oops or panic) or at boot time.

    I've verified that this patch works with all accepted values of windowBits
    (positive and negative), memLevel, and compression level.

    Signed-off-by: Jim Keniston
    Cc: Herbert Xu
    Cc: David Miller
    Cc: Chris Mason
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jim Keniston
     

21 Sep, 2009

1 commit

03 Feb, 2008

1 commit

23 Jun, 2006

1 commit

  • 4f3865fb5   [PATCH] zlib_inflate: Upgrade library code to a recent version ... Browse Code »
    43

    Upgrade the zlib_inflate implementation in the kernel from a patched
    version 1.1.3/4 to a patched 1.2.3.

    The code in the kernel is about seven years old and I noticed that the
    external zlib library's inflate performance was significantly faster (~50%)
    than the code in the kernel on ARM (and faster again on x86_32).

    For comparison the newer deflate code is 20% slower on ARM and 50% slower
    on x86_32 but gives an approx 1% compression ratio improvement. I don't
    consider this to be an improvement for kernel use so have no plans to
    change the zlib_deflate code.

    Various changes have been made to the zlib code in the kernel, the most
    significant being the extra functions/flush option used by ppp_deflate.
    This update reimplements the features PPP needs to ensure it continues to
    work.

    This code has been tested on ARM under both JFFS2 (with zlib compression
    enabled) and ppp_deflate and on x86_32. JFFS2 sees an approx. 10% real
    world file read speed improvement.

    This patch also removes ZLIB_VERSION as it no longer has a correct value.
    We don't need version checks anyway as the kernel's module handling will
    take care of that for us. This removal is also more in keeping with the
    zlib author's wishes (http://www.zlib.net/zlib_faq.html#faq24) and I've
    added something to the zlib.h header to note its a modified version.

    Signed-off-by: Richard Purdie
    Acked-by: Joern Engel
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Purdie
     

11 Jan, 2006

1 commit

  • 87c2ce3b9   [PATCH] lib/zlib*: cleanups ... Browse Code »

    This patch contains the following possible cleanups:
    - #if 0 the following unused functions:
    - zlib_deflate/deflate.c: zlib_deflateSetDictionary
    - zlib_deflate/deflate.c: zlib_deflateParams
    - zlib_deflate/deflate.c: zlib_deflateCopy
    - zlib_inflate/infblock.c: zlib_inflate_set_dictionary
    - zlib_inflate/infblock.c: zlib_inflate_blocks_sync_point
    - zlib_inflate/inflate_sync.c: zlib_inflateSync
    - zlib_inflate/inflate_sync.c: zlib_inflateSyncPoint
    - remove the following unneeded EXPORT_SYMBOL's:
    - zlib_deflate/deflate_syms.c: zlib_deflateCopy
    - zlib_deflate/deflate_syms.c: zlib_deflateParams
    - zlib_inflate/inflate_syms.c: zlib_inflateSync
    - zlib_inflate/inflate_syms.c: zlib_inflateSyncPoint

    Signed-off-by: Adrian Bunk
    Cc: Matt Mackall
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Adrian Bunk
     

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds