From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 1355 invoked by alias); 18 Dec 2008 10:02:43 -0000 Received: (qmail 1246 invoked by uid 22791); 18 Dec 2008 10:02:43 -0000 X-SWARE-Spam-Status: No, hits=-0.3 required=5.0 tests=AWL,BAYES_00 X-Spam-Status: No, hits=-0.3 required=5.0 tests=AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from e28smtp07.in.ibm.com (HELO e28smtp07.in.ibm.com) (59.145.155.7) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 18 Dec 2008 10:01:53 +0000 Received: from d28relay04.in.ibm.com (d28relay04.in.ibm.com [9.184.220.61]) by e28smtp07.in.ibm.com (8.13.1/8.13.1) with ESMTP id mBIA1nZv023236 for ; Thu, 18 Dec 2008 15:31:49 +0530 Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay04.in.ibm.com (8.13.8/8.13.8/NCO v9.1) with ESMTP id mBIA1pik4128804 for ; Thu, 18 Dec 2008 15:31:51 +0530 Received: from d28av01.in.ibm.com (loopback [127.0.0.1]) by d28av01.in.ibm.com (8.13.1/8.13.3) with ESMTP id mBIA1lY2013628 for ; Thu, 18 Dec 2008 15:31:48 +0530 Received: from in.ibm.com (prasadkr-t60p.in.ibm.com [9.124.31.52]) by d28av01.in.ibm.com (8.13.1/8.12.11) with ESMTP id mBIA1jU4013535 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 18 Dec 2008 15:31:47 +0530 Date: Thu, 18 Dec 2008 10:21:00 -0000 From: "K.Prasad" To: KOSAKI Motohiro Cc: Jun Koi , Satoshi OSHIMA , systemtap@sourceware.org, mhiramat@redhat.com, hisashi.hashimoto.wh@hitachi.com, Yumiko SUGITA Subject: Re: Discussion at Linux Foundation Japan Symposium Message-ID: <20081218100145.GB4846@in.ibm.com> Reply-To: prasad@linux.vnet.ibm.com References: <20081218181653.97C0.KOSAKI.MOTOHIRO@jp.fujitsu.com> <20081218094539.GA4846@in.ibm.com> <20081218185148.94C3.KOSAKI.MOTOHIRO@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081218185148.94C3.KOSAKI.MOTOHIRO@jp.fujitsu.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-IsSubscribed: yes Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org X-SW-Source: 2008-q4/txt/msg00597.txt.bz2 On Thu, Dec 18, 2008 at 06:57:57PM +0900, 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. > Now, ftrace can trace any function by -pg compile option and > self modification code. > > Can we do the same thing? > I think ftrace approach have very few performance degression and > we can apply production kernel. > investigate ftrace interface: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6594 Thanks, K.Prasad