[RFC] makedumpfile-1.1.4-rc: ia64 DISCONTIGMEM support

[Vivek Goyal]

On Tue, Sep 04, 2007 at 04:26:52PM -0700, Randy Dunlap wrote:
> On Mon, 3 Sep 2007 16:57:08 +0900 tachibana at mxm.nes.nec.co.jp wrote:
> 
> > Makefile installs ld command etc. and they influence kernel build.
> > We installed elfutils-0.125 not by 'make install' but by procedure 
> > written at README of makedumpfile-1.1.6 in RHEL5.0 environment.
> > Please uninstall elfutils-0.125 and elfutils-0.128 and try the above
> > procedure.
> 
> 
> Hi tachibana-san,
> 
> I have makedumpfile filtering working now.  Much thanks.
> 
> Examples of filtering on a 1 GB x86_64 system, booted with
> "crashkernel=64M at 16M" and then crashed (sysrq-c).
> 
> 
> Various makedumpfile -d values and their results:
> 
> makedumpfile -d 1 -E -i vmcore.info vmcore.002 dump002.omit.zero 
> makedumpfile -d 17 -E -i vmcore.info vmcore.002 dump002.omit.zero.free
> makedumpfile -d 23 -E -i vmcore.info vmcore.002 dump002.omit.zero.free.all.cache
> makedumpfile -d 31 -E -i vmcore.info vmcore.002 dump002.omit.all
> 
> -r-------- 1 rddunlap users    970M Sep  4 12:36 vmcore.002 // dumpfile
> -rw------- 1 rddunlap rddunlap 966M Sep  4 15:10 dump002.omit.zero
> -rw------- 1 rddunlap rddunlap 661M Sep  4 15:29 dump002.omit.zero.free
> -rw------- 1 rddunlap rddunlap 443M Sep  4 15:43 dump002.omit.zero.free.all.cache
> -rw------- 1 rddunlap rddunlap 429M Sep  4 15:55 dump002.omit.all
> 

Interesting. Even after filtering all, dump file size is 429 MB. Given this
system has got 1GB of memory, so file size reduction is about only 55%.
Wondering what kind of kernel data is in there. Can something else also be
filtered out.

Thanks
Vivek