Discussion at Linux Foundation Japan Symposium

[Masami Hiramatsu]

KOSAKI Motohiro wrote:
>>> Of cource, this approach indicate systemtap lost some feature.
>>> (e.g. above section don't have line number information and local
>>>  variable name information)
>>>
>>> but it is still useful for average tracing user.
>>>
>> I'm not sure if the issue is discussed without being aware of the
>> dwarfless probing that's available in SystemTap since a while ago. More
>> details at: http://sourceware.org/systemtap/wiki/MakeDoWithoutDebugInfo
> 
> Cool.
> 
> but, I feel "must asmlinkage" is too strong restriction.

Agreed, logically, no-asmlinkage function can be also easily traced
at least x86/x86-64. (I'm not sure whether we can identify which
functions are asmlinkage or not.)

Thanks,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com