From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 1523 invoked by alias); 14 Nov 2009 00:26:01 -0000 Received: (qmail 1512 invoked by uid 22791); 14 Nov 2009 00:26:01 -0000 X-SWARE-Spam-Status: No, hits=-2.5 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS,SPF_PASS X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sat, 14 Nov 2009 00:25:57 +0000 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id nAE0PtW3013135 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Fri, 13 Nov 2009 19:25:55 -0500 Received: from [10.16.2.46] (dhcp-100-2-46.bos.redhat.com [10.16.2.46]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id nAE0PsfF018494; Fri, 13 Nov 2009 19:25:54 -0500 Message-ID: <4AFDF912.10203@redhat.com> Date: Sat, 14 Nov 2009 00:26:00 -0000 From: Masami Hiramatsu User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.4pre) Gecko/20091014 Fedora/3.0-2.8.b4.fc11 Thunderbird/3.0b4 MIME-Version: 1.0 To: Roland McGrath CC: Ingo Molnar , lkml , systemtap , DLE Subject: Re: [PATCH -tip 2/3] Add coredump tracepoint References: <20091113225226.15079.90813.stgit@harusame> <20091113225233.15079.41600.stgit@harusame> <20091113233912.192A3100E@magilla.sf.frob.com> <20091114000234.GA24738@elte.hu> <20091114000627.48ED615E8@magilla.sf.frob.com> In-Reply-To: <20091114000627.48ED615E8@magilla.sf.frob.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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: 2009-q4/txt/msg00525.txt.bz2 Roland McGrath wrote: >> Oh, so SystemTap is the motivator of these tracepoints? > > Nope. My suggestion about arguments to pass was just generic based on the > innate context of this tracepoint. > >> Do you know about exact usecases where these tracepoints would be >> utilized? Would be interesting (and relevant) to list them. > > Masami's colleagues do have something in particular in mind, > but I'm not sure whether they intend to use systemtap as part > of the implementation of that or not. Yeah, we'd like to use this tracepoint to analyze coredump miss-configuration. Sometimes, users miss-configure dump-filter and rlimit, that will cause system-slowdown when several processes, which share a large amount of memory among them (e.g. database), start core-dump with shared memory. And then, it can cause a system-switching on HA cluster system. With this tracepoint, we can analyze why the coredumps were slow. Thank you, -- Masami Hiramatsu Software Engineer Hitachi Computer Products (America), Inc. Software Solutions Division e-mail: mhiramat@redhat.com