Sorry, the cc list is wrong, I will resend the mails.
> -----Original Message-----
> From: qiaonuo...@cn.fujitsu.com [mailto:qiaonuo...@cn.fujitsu.com]
> Sent: Wednesday, May 08, 2013 9:54 AM
> To: qemu-devel@nongnu.org
> Cc:
> ebl...@redhat.com.berra...@redhat.com.afaer...@suse.de.d.hatayama@jp.fujitsu.c
> om.zhan...@cn.fujitsu.com; Qiao Nuohan
> Subject: [PATCH 0/9 v2] Make monitor command 'dump-guest-memory' dump in
> kdump-compressed format
>
> From: Qiao Nuohan <qiaonuo...@cn.fujitsu.com>
>
> Hi, all
>
> The last version is here:
> http://lists.gnu.org/archive/html/qemu-devel/2013-05/msg00803.html
>
> Command 'dump-guest-memory' was introduced to dump guest's memory. But the
> vmcore's format is only elf32 or elf64. The message is here:
> http://lists.gnu.org/archive/html/qemu-devel/2012-04/msg03379.html
>
> For migration, 'dump-guest-memory' is supposed to support compression feature.
> Because of the regression, the missing of compression feature, we post these
> patches to make 'dump-guest-memory' be able to dump guest's in kdump-
> compressed
> format. Then vmcore can be much smaller, and easily be delivered.
>
> The kdump-compressed format is *linux specific* *linux standard* crash dump
> format used in kdump framework. The kdump-compressed format is readable only
> with the crash utility, and it can be smaller than the ELF format because of
> the compression support.
>
> Note, similar to 'dump-guest-memory':
> 1. The guest should be x86 or x86_64. The other arch is not supported now.
> 2. If the OS is in the second kernel, gdb may not work well, and crash can
> work by specifying '--machdep phys_addr=xxx' in the command line. The
> reason is that the second kernel will update the page table, and we can
> not get the page table for the first kernel.
> 3. The cpu's state is stored in QEMU note.
> 4. The vmcore are able to be compressed with zlib, lzo or snappy. zlib is
> available by default, and option '--enable-lzo' or '--enable-snappy'
> should be used with configure to make lzo or snappy available.
>
> Changelog:
> Changes from v1 to v2:
> 1. Address Eric & Daniel's comment: fix manner of string copy.
> 2. Address Eric's comment: replace reinventing new constants by using the
> ready-made ones accoring.
> 3. Address Andreas's comment: remove useless include.
>
> Qiao Nuohan (9):
> Add API to manipulate dump_bitmap
> Add API to manipulate cache_data
> Move includes and struct definition to dump.h
> Add API to create header of vmcore
> Add API to create data of dump bitmap
> Add API to create page
> Add API to free buf used by creating header, bitmap and page
> Add API to write header, bitmap and page into vmcore
> Make monitor command 'dump-guest-memory' dump in kdump-compressed
> format
>
> Makefile.target | 2 +-
> cache_data.c | 121 +++++++
> configure | 50 +++
> dump.c | 877 ++++++++++++++++++++++++++++++++++++++++++++++--
> -
> dump_bitmap.c | 171 ++++++++++
> hmp-commands.hx | 12 +-
> hmp.c | 23 ++-
> include/cache_data.h | 56 ++++
> include/dump_bitmap.h | 60 ++++
> include/sysemu/dump.h | 176 ++++++++++
> qapi-schema.json | 23 ++-
> qmp-commands.hx | 6 +-
> 12 files changed, 1527 insertions(+), 50 deletions(-)
> create mode 100644 cache_data.c
> create mode 100644 dump_bitmap.c
> create mode 100644 include/cache_data.h
> create mode 100644 include/dump_bitmap.h
>
