Introduction:
  To shorten the size of the dumpfile and the time of creating the
  dumpfile, makedumpfile copies only the necessary pages for analysis
  to the dumpfile from /proc/vmcore.   You can specify the kind of
  unnecessary pages with dump_level. If you want to shorten the size
  further, enable the compression of the page data.

Download:
    https://sourceforge.net/projects/makedumpfile/

Usage:
  makedumpfile [-c] [-E] [-d dump_level] [-x vmlinux] dump_mem dump_file

Example:
  If you want to exclude pages filled by zero, cache pages, user pages
  and free pages and to enable compression, please execute the following
  command.

  # makedumpfile -c -d 31 -x vmlinux /proc/vmcore dumpfile

SSH transporting support:
  For ssh transporting support, -F and -R options are added.
  A panic system sends dump data to a remote host with -F option, and
  a remote host re-arranges dump data received to a normal dumpfile
  (readable by analysis tools) with -R option.
  Example-1:
  # makedumpfile -F -cd31 -x vmlinux /proc/vmcore | ssh user@host "makedumpfile -R dumpfile"

  A perl script makedumpfile-R.pl implements the same function as '-R'
  option. Perl script does not depend on architecture, and a lot of
  systems have perl command. Even if a remote host does not have the
  makedumpfile command, it is possible to transport a dumpfile to a
  remote host with running this script.
  Example-2:
  1. Transport the script.
    # scp makedumpfile-R.pl user@remote:makedumpfile-R.pl
  2. Transport a dumpfile. 
    # makedumpfile -F -cd31 -i config /proc/vmcore | ssh user@remote "./makedumpfile-R.pl dumpfile"