Re: [RFA/RFC Prec] Add process record skip 6/6 (doc)

[Eli Zaretskii <eliz@gnu.org>]

> From: Hui Zhu <teawater@gmail.com>
> Date: Mon, 24 Aug 2009 16:49:42 +0800
> Cc: gdb-patches@sourceware.org, msnyder@vmware.com, green@moxielogic.com
> 
> Because the change of each function is special, function
> record_skip_entry_create need a special record function pointer for
> each function that want to skip.  For example, in
> "5-skip-record-i386-linux.txt".
> +  record_skip_entry_create (gdbarch, "printf",
> +                            i386_linux_process_record_simple_function);
> +  record_skip_entry_create (gdbarch, "memset",
> +                            i386_linux_process_record_memset);
> +  record_skip_entry_create (gdbarch, "memcpy",
> +                            i386_linux_process_record_memset);
> 
> i386_linux_process_record_simple_function is for printf.
> i386_linux_process_record_memset is for memset and memcpy.

So we currently support record skip of only 3 functions, the ones
mentioned above, is that right?  In that case, we should document
those functions in the manual, I think.

> Without the skip, to record a function, it need record all the insn change:
> 1. It need step by step. Speed is low.
> 2. It need record the change of each insn, it will need a lot of memory.
> 
> With the skip, to record a function, it just record the change in the
> begin of function, after that, continue.
> 1.  It doesn't need step by step. Speed is hight.
> 2.  it doesn't need  record the each insn, it will not need a lot of memory.

Do we lose any information because of skip?  If not, why don't we do
that always, why do we need an option to enable and disable that?