From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 32744 invoked by alias); 11 Jul 2006 14:13:28 -0000 Received: (qmail 32737 invoked by uid 22791); 11 Jul 2006 14:13:28 -0000 X-Spam-Status: No, hits=-2.9 required=5.0 tests=AWL,BAYES_00,SPF_PASS X-Spam-Check-By: sourceware.org Received: from mtagate6.de.ibm.com (HELO mtagate6.de.ibm.com) (195.212.29.155) by sourceware.org (qpsmtpd/0.31) with ESMTP; Tue, 11 Jul 2006 14:13:22 +0000 Received: from d12nrmr1607.megacenter.de.ibm.com (d12nrmr1607.megacenter.de.ibm.com [9.149.167.49]) by mtagate6.de.ibm.com (8.13.6/8.13.6) with ESMTP id k6BEDIbq071556 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL) for ; Tue, 11 Jul 2006 14:13:19 GMT Received: from d12av02.megacenter.de.ibm.com (d12av02.megacenter.de.ibm.com [9.149.165.228]) by d12nrmr1607.megacenter.de.ibm.com (8.13.6/NCO/VER7.0) with ESMTP id k6BEGCIo085976 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 11 Jul 2006 16:16:12 +0200 Received: from d12av02.megacenter.de.ibm.com (loopback [127.0.0.1]) by d12av02.megacenter.de.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id k6BEDI7q005964 for ; Tue, 11 Jul 2006 16:13:18 +0200 Received: from dyn-9-152-216-78.boeblingen.de.ibm.com (dyn-9-152-216-78.boeblingen.de.ibm.com [9.152.216.78]) by d12av02.megacenter.de.ibm.com (8.12.11.20060308/8.12.11) with ESMTP id k6BEDIFS005957; Tue, 11 Jul 2006 16:13:18 +0200 Subject: Re: [PATCH] kprobes for s390 architecture From: Martin Schwidefsky Reply-To: schwidefsky@de.ibm.com To: Mike Grundy Cc: Heiko Carstens , Jan Glauber , linux-kernel@vger.kernel.org, systemtap@sources.redhat.com In-Reply-To: <20060711135430.GA5070@localhost.localdomain> References: <20060623150344.GL9446@osiris.boeblingen.de.ibm.com> <20060623222106.GA25410@osiris.ibm.com> <20060624113641.GB10403@osiris.ibm.com> <1151421789.5390.65.camel@localhost> <20060628055857.GA9452@osiris.boeblingen.de.ibm.com> <20060707172333.GA12068@localhost.localdomain> <20060707172555.GA10452@osiris.ibm.com> <20060711135430.GA5070@localhost.localdomain> Content-Type: text/plain Organization: IBM Corporation Date: Tue, 11 Jul 2006 14:13:00 -0000 Message-Id: <1152627198.18034.19.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.6.2 Content-Transfer-Encoding: 7bit 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-q3/txt/msg00055.txt.bz2 On Tue, 2006-07-11 at 09:54 -0400, Mike Grundy wrote: > I did a little measuring. On average stop_machine_run() adds 8.7 msec of > overhead on a 4-way config. Of that %57 was sub-msec overhead. For the times > where overhead was measurable, the average was 20.2 msec, lowest at 10msec > highest at 100msec. That's on a z800 under vm and I have no idea how many real > cpus the machine has :-) So adding 100 probes will roughly take 1 second. Not too bad, I expected it to take longer. -- blue skies, Martin. Martin Schwidefsky Linux for zSeries Development & Services IBM Deutschland Entwicklung GmbH "Reality continues to ruin my life." - Calvin.