[PATCH v2 7/8] makedumpfile: Add erased information in compressed kdump file

Ken'ichi Ohmichi oomichi at mxs.nes.nec.co.jp
Fri Aug 19 02:16:59 EDT 2011

Hi Mahesh,

Sorry about many responses of this patch.

On Wed, 18 May 2011 01:36:17 +0530
Mahesh J Salgaonkar <mahesh at linux.vnet.ibm.com> wrote:
> From: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>
> Include the erase information in the makedumpfile generated dumpfile. The
> erased information contains only effective lines from the filter
> configuration file. This patch supports inclusion of erase information in
> kdump compressed, flatten and split dumpfiles. On re-filtering, the erase
> information from input dumpfile (if any) will be carried over to resulting
> dumpfile.
> This patch introduces new members offset_eraseinfo, size_eraseinfo into the
> sub header in compressed kdump file.
> The erased information would contain *multiple* erased symbol names.
> For example, the following is based on your above example.
> 	struct S1 {
> 		int a;
> 		int b;
> 		int c;
> 	};
> 	struct S2 {
> 		struct S1 *mystruct1;
> 		struct S1 *mystruct2;
> 	};
> 	struct S2 mystruct2;
> 	#Filter command
> 	erase mystruct2.mystruct1.a
> 	erase mystruct2.mystruct1.c
> 	erase mystruct2.mystruct2.b
> 	#The erased information
> 	erase mystruct2.mystruct1.a 4
> 	erase mystruct2.mystruct1.c 4
> 	erase mystruct2.mystruct2.b 4

While testing this feature, I noticed the description format of
makedumpfile.conf is different from the one of eraseinfo.
The former contains "size", but the later does not.

I feel the same format will be useful.
Are there any reasons of different formats ?

Ken'ichi Ohmichi

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