Messages in this thread |  | | | Date | Wed, 09 Mar 2005 20:16:35 +0000 | | From | Paulo Marques <> | | Subject | Re: inconsistent kallsyms data [2.6.11-mm2] |
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Paulo Marques wrote: > [...] > Can you send me privately a tar.bz2 containing your .config, > .tmp_kallsyms1.S and .tmp_kallsyms2.S so I can try to figure out what's > going on?
Ok, after some investigation into the files I was able to find out the problem.
scripts/kallsyms.c uses a subset of the symbol table to optimize the tokens to use to compress the symbols. It does this because using the complete set of symbols would be much slower without a significant gain in compression.
For some reason, in the files sent by Dominik, two aliased symbols change places from the first to the second step of the kallsyms build process (__sched_text_start, __down).
Because of this, the subset used for optimization is different and so are the tokens selected, producing a 2 byte difference in the total size of the compressed symbol names :P
So I must change the sampling algorithm in a way that is robust to symbol position changes.
A simple and robust way is to do the sampling on a list of symbols sorted by symbol name. This way, even if the symbol positions that are given to scripts/kallsyms change, the symbols sampled will be the same.
I'll do the patch to do this and send it ASAP.
-- Paulo Marques - www.grupopie.com
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