From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 16739 invoked by alias); 7 Apr 2006 08:25:27 -0000 Received: (qmail 16722 invoked by uid 22791); 7 Apr 2006 08:25:26 -0000 X-Spam-Status: No, hits=-0.9 required=5.0 tests=AWL,BAYES_00,SPF_SOFTFAIL,SUBJ_HAS_UNIQ_ID X-Spam-Check-By: sourceware.org Received: from e6.ny.us.ibm.com (HELO e6.ny.us.ibm.com) (32.97.182.146) by sourceware.org (qpsmtpd/0.31) with ESMTP; Fri, 07 Apr 2006 08:25:23 +0000 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by e6.ny.us.ibm.com (8.12.11.20060308/8.12.11) with ESMTP id k378PBpQ013395 for ; Fri, 7 Apr 2006 04:25:11 -0400 Received: from d01av02.pok.ibm.com (d01av02.pok.ibm.com [9.56.224.216]) by d01relay04.pok.ibm.com (8.12.10/NCO/VER6.8) with ESMTP id k378P0uK230514 for ; Fri, 7 Apr 2006 04:25:00 -0400 Received: from d01av02.pok.ibm.com (loopback [127.0.0.1]) by d01av02.pok.ibm.com (8.12.11/8.13.3) with ESMTP id k378P0ZJ024673 for ; Fri, 7 Apr 2006 04:25:00 -0400 Received: from newton.in.ibm.com ([9.124.31.64]) by d01av02.pok.ibm.com (8.12.11/8.12.11) with ESMTP id k378OxI6024627; Fri, 7 Apr 2006 04:24:59 -0400 Received: by newton.in.ibm.com (Postfix, from userid 500) id DBD92CE3; Fri, 7 Apr 2006 13:55:17 +0530 (IST) Date: Fri, 07 Apr 2006 08:25:00 -0000 From: Prasanna S Panchamukhi To: "Frank Ch. Eigler" Cc: Hien Q Nguyen , systemtap@sources.redhat.com Subject: Re: [...] kprobes [minutes] portion 20060406 Message-ID: <20060407082517.GA7546@in.ibm.com> Reply-To: prasanna@in.ibm.com References: <20060406212838.GB22703@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060406212838.GB22703@redhat.com> User-Agent: Mutt/1.4.1i X-IsSubscribed: yes Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org X-SW-Source: 2006-q2/txt/msg00063.txt.bz2 On Thu, Apr 06, 2006 at 05:28:38PM -0400, Frank Ch. Eigler wrote: > Hi - > > On Thu, Apr 06, 2006 at 02:14:46PM -0700, Hien Q Nguyen wrote: > > User space probe > > Prasanna had prototype that execute the handler in the user space [...] > > Beyond merely dispatching, it is important to consider what such a > handler can do. Would it still be useful if it cannot call into the > kernel-side runtime, if it cannot share variables with kernel-space > probes? No. The purpose of prototype was to see how it can be implemented. To my opinion having handler run in user-space does not suit well for system-wide tracing. But that might be one of the alternative approaches to per-process tracing, since ptrace is found to have more performance related problems. Thanks Prasanna -- Thanks & Regards Prasanna S Panchamukhi Linux Technology Center India Software Labs, IBM Bangalore Email: prasanna@in.ibm.com Ph: 91-80-51776329