From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753993Ab0ITXzL (ORCPT ); Mon, 20 Sep 2010 19:55:11 -0400 Received: from mail7.hitachi.co.jp ([133.145.228.42]:53736 "EHLO mail7.hitachi.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750960Ab0ITXzJ (ORCPT ); Mon, 20 Sep 2010 19:55:09 -0400 X-AuditID: b753bd60-a9cd2ba000005dcc-d9-4c97f45b270c Message-ID: <4C97F451.5090907@hitachi.com> Date: Tue, 21 Sep 2010 08:54:57 +0900 From: Masami Hiramatsu Organization: Systems Development Lab., Hitachi, Ltd., Japan User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; ja; rv:1.9.2.9) Gecko/20100915 Thunderbird/3.1.4 MIME-Version: 1.0 To: Luming Yu Cc: LKML , 2nddept-manager@sdl.hitachi.co.jp Subject: Re: Is it supported to perf probe data? References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: AAAAAA== X-FMFTCR: RANGEC Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Luming, (2010/09/20 17:03), Luming Yu wrote: > Hi there, > > I need to analyze accessing pattern to a data in kernel. Wanna to > check with you if perf probe can help to get that trace. Yes, perf probe can add new trace events which can be used from perf record/report/trace or ftrace as same as other pre-defined trace events. Those new events can record variables as arguments too. So you can define new events with accessed data, record it by perf record, and see it by perf trace. Thank you, -- Masami HIRAMATSU 2nd Dept. Linux Technology Center Hitachi, Ltd., Systems Development Laboratory E-mail: masami.hiramatsu.pt@hitachi.com