profiling question

Hello

In http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html "profiling" and "profiling_history_size" variables are noted as session variables, which is also mentioned in
http://dev.mysql.com/doc/refman/5.0/en/show-profiles.html

However profiling_history_size can be set from the my.cnf file where as profiling can't. Also from mysql command line it is possible to do ie SET GLOBAL profiling_history_size=10;

So is profiling_history_size session but handled like global or simply hasn't been updated in the docs?

Also I would like to ask if there is a reason for not having profiling as global variable.

Regards
Vangelis

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