What does several of perf configurations (alias, help, call-graph) mean ?

[taeung <treeze.taeung@gmail.com>]

Hi, every one. :-)

I'm tring to make things about perf configuration neat and tidy.
Three questions have arisen doing it.

1. alias [ util/alias.c : alias_lookup_cb(), util/help.c : 
perf_unknown_cmd_config() ]

         What kind of alias keys are there ?

2. help [ builtin-help.c : perf_help_config() ]

         'autocorrect' can have a value of integer type.
         What does the value mean ?

3. call-graph [ util/callchain.c : perf_callchain_config(), 
parse_callchain_record_opt() ]

         record-mode can be 'Framepointer style' or  'Dwarf style'.
         Why does 'Dwarf style' accompany dump-size ?

         'threshold' can have a value of double type
         and the value can be entered into callchain_param.min_percent.
         What does 'threshold' mean ?


Thanks,
Taeung