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Re: Discussion at Linux Foundation Japan Symposium
- From: Masami Hiramatsu <mhiramat at redhat dot com>
- To: KOSAKI Motohiro <kosaki dot motohiro at jp dot fujitsu dot com>
- Cc: prasad at linux dot vnet dot ibm dot com, Jun Koi <junkoi2004 at gmail dot com>, Satoshi OSHIMA <satoshi dot oshima dot fk at hitachi dot com>, systemtap at sourceware dot org, hisashi dot hashimoto dot wh at hitachi dot com, Yumiko SUGITA <yumiko dot sugita dot yf at hitachi dot com>
- Date: Thu, 18 Dec 2008 10:40:56 -0500
- Subject: Re: Discussion at Linux Foundation Japan Symposium
- References: <20081218181653.97C0.KOSAKI.MOTOHIRO@jp.fujitsu.com> <20081218094539.GA4846@in.ibm.com> <20081218185148.94C3.KOSAKI.MOTOHIRO@jp.fujitsu.com>
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