From mboxrd@z Thu Jan 1 00:00:00 1970 From: Victor Jimenez Subject: Sampling instruction pointer on PPC Date: Thu, 01 Mar 2012 18:08:10 +0100 Message-ID: <4F4FACFA.6080209@bsc.es> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mao.bsc.es ([84.88.52.34]:40997 "EHLO opsmail01.bsc.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757211Ab2CARIO (ORCPT ); Thu, 1 Mar 2012 12:08:14 -0500 Received: from localhost (localhost [127.0.0.1]) by opsmail01.bsc.es (Postfix) with ESMTP id 04B17517BB for ; Thu, 1 Mar 2012 18:08:12 +0100 (CET) Received: from opsmail01.bsc.es ([127.0.0.1]) by localhost (opswc01.bsc.es [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 16030-10 for ; Thu, 1 Mar 2012 18:08:11 +0100 (CET) Received: from opswc01.bsc.es (localhost [127.0.0.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by opsmail01.bsc.es (Postfix) with ESMTPS id 3CE286FAB8 for ; Thu, 1 Mar 2012 18:08:11 +0100 (CET) Received: (from filter@localhost) by opswc01.bsc.es (8.13.6/8.13.6/Submit) id q21H8BT8018463 for linux-perf-users@vger.kernel.org; Thu, 1 Mar 2012 18:08:11 +0100 Received: from [84.88.50.218] (unknown [84.88.50.218]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by opsmail01.bsc.es (Postfix) with ESMTPSA id 083BB517D8 for ; Thu, 1 Mar 2012 18:08:11 +0100 (CET) Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: linux-perf-users@vger.kernel.org I am trying to sample instruction pointer along time on a Power7 system. I know that there are accurate mechanisms to do so in Intel processors (e.g., PEBS and Branch Trace Store). Is it possible to do something similar in Power7? Will the samples be accurate? I am worried that significant delays (skids) may appear. Thank you, Victor WARNING / LEGAL TEXT: This message is intended only for the use of the individual or entity to which it is addressed and may contain information which is privileged, confidential, proprietary, or exempt from disclosure under applicable law. If you are not the intended recipient or the person responsible for delivering the message to the intended recipient, you are strictly prohibited from disclosing, distributing, copying, or in any way using this message. If you have received this communication in error, please notify the sender and destroy and delete any copies you may have received. http://www.bsc.es/disclaimer.htm