Hi, makedumpfile version 1.3.5 is released. Your comments/patches are welcome. Changelog: o New feature - Store vmcoreinfo data into a dumpfile in the kdump-compressed format. - Read vmcoreinfo data from a kdump-compressed dumpfile. For usability, this patchset makes '-x'/'-i' option unnecessary for re-filtering. makedumpfile v1.3.4 can read a dumpfile in the kdump-compressed format instead of /proc/vmcore and re-filter it. When re-filtering, makedumpfile v1.3.4 needs '-x'/'-i' option. If not specifying, it failed like the following: # makedumpfile -c -d 3 /proc/vmcore vmcore.1 ... The dumpfile is saved to vmcore.1 ... # # /makedumpfile -c -d 31 vmcore.1 vmcore.2 vmcore.1 doesn't contain vmcoreinfo. Specify '-x' option or '-i' option. Commandline parameter is invalid. Try `makedumpfile --help' for more information. # A new makedumpfile (v1.3.5) takes vmcoreinfo data from /proc/vmcore and stores the data into a dumpfile in the kdump-compressed fomat. When re-filtering, makedumpfile takes the data from the dumpfile and uses it. So '-x'/'-i' option is not necessary. o Code Cleanup - Set the calculated value to dh->sub_hdr_size. - Fix some indents in write_kdump_header(). - Unify the name of kdump_sub_header. - Fix the typo of DISKDUMP_HEADER_BLOCKS. - Add the description about re-filtering into manpage. - Fix the description in manpage and README. Explanation of makedumpfile: 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: You can download the latest makedumpfile from the following URL. Details of the change are written on the git page of the following site. https://sourceforge.net/projects/makedumpfile/ Method of installation: You can compile the makedumpfile command as follows; 1. "tar -zxvf makedumpfile-x.y.z.tar.gz" 2. "cd makedumpfile-x.y.z" 3. "make; make install" 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 Thanks Ken'ichi Ohmichi