[PATCH makedumpfile v2 0/4] LZO Compression Support

[HATAYAMA Daisuke]

The following series implements LZO compression support to
makedumpfile. LZO is as good as in size but by far better in speed
than ZLIB, readucing down time during generation of crash dump and
refiltering.

The RFC discussion was made here:

  http://lists.infradead.org/pipermail/kexec/2011-November/005783.html
  http://lists.infradead.org/pipermail/kexec/2011-December/005868.html

How to build:

  1. Get lzo libraries: lzo, lzo-devel and lzo-minilzo from either of
  the following:

    1) Original author's website:
       http://www.oberhumer.com/opensource/lzo/

    2) yum framework on fedora. Older releases don't have the packages.

  2. Apply the patch set to makedumpfile v1.4.2.

  3. Do make as follows:

    $ make USELZO=on

    Note: In default, no LZO compression support is included.

How to use:

  Introduce new -l option. If a user specify this, makedumpfile
  generates dumpfile compressed by pages with lzo compression.

  Example)
  $ makedumpfile -l vmcore dumpfile

Performance evaluation:

  - Kumagai-san's evaluation simulating working servers:
    http://lists.infradead.org/pipermail/kexec/2011-December/005868.html

  - My evaluation focusing on the worst cases:
    http://lists.infradead.org/pipermail/kexec/2011-November/005783.html

LZO Support for crash:

  I'll post LZO support patch for crash after makedumpfile merges
  these patches.

Changelog:

  v1 => v2:

    - Add build condition for LZO support. Enable LZO support if
      specifying USELZO=on to make command.

    - Avoid LONG_MAX/ULONG_MAX redefinitions.

---

HATAYAMA Daisuke (4):
      Add build condition for LZO support
      Add help and manual messages about LZO compression support
      Avoid LONG_MAX/ULONG_MAX redefinitions
      Add LZO Support


 Makefile       |    5 ++++
 common.h       |    4 +++
 diskdump_mod.h |    3 ++-
 makedumpfile.8 |    6 +++--
 makedumpfile.c |   67 ++++++++++++++++++++++++++++++++++++++++++++++++++------
 makedumpfile.h |    4 +++
 print_info.c   |   16 +++++++------
 7 files changed, 86 insertions(+), 19 deletions(-)

-- 
HATAYAMA Daisuke