From mboxrd@z Thu Jan 1 00:00:00 1970 From: mingo@elte.hu (Ingo Molnar) Date: Thu, 11 Nov 2010 09:28:43 +0100 Subject: [Questions] How to run 'perf top' on ARM to profile kernel functions with modules loaded In-Reply-To: References: Message-ID: <20101111082843.GA32728@elte.hu> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org * Ming Lei wrote: > 2010/11/11 Ming Lei : > > Hi, > > > > 'perf top' can't display any functions when modules are loaded on ARM. > > Sorry, should be can't display any kernel functions when modules are loaded > on ARM. > > Also, when modules are loaded, 'perf report' can't display functions names, > follows result of 'perf report': > > root at beagleboard:~# perf report > # Events: 4K cycles > # > # Overhead Command Shared Object Symbol > # ........ ........... ................. ...................... > # > 97.36% swapper [musb_hdrc] [k] 10466c4 > 2.19% perf [musb_hdrc] [k] 10da070 > 0.09% ksoftirqd/0 [musb_hdrc] [k] 10db998 > 0.06% perf libc-2.9.so [.] memchr > 0.04% perf libc-2.9.so [.] 663c0 > 0.02% perf perf [.] 2e80 > 0.02% perf libc-2.9.so [.] closedir > 0.02% perf libc-2.9.so [.] __read > 0.02% flush-179:0 [musb_hdrc] [k] 10ff124 > 0.02% perf libc-2.9.so [.] memset > 0.02% perf libc-2.9.so [.] __memcpy_chk > 0.02% perf perf [.] event__synthesize_comm > 0.02% perf ffff0fc4 [.] ffff0fc4 > 0.02% perf perf [.] hex2u64 > 0.02% perf libc-2.9.so [.] _IO_vfprintf > 0.02% perf libc-2.9.so [.] fgets > 0.02% perf libpthread-2.9.so [.] flockfile > 0.02% perf perf [.] kallsyms__parse > 0.02% perf libc-2.9.so [.] _IO_getline_info > > Any suggestions or comments? Must be some bug in the ELF symbol handling code - we've had many cases of quirks and special cases there. Please run 'perf archive' and send the resulting perf.data.tar.bz2 to Arnaldo in private mail. (the file will be big) Thanks, Ingo From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757888Ab0KKI3F (ORCPT ); Thu, 11 Nov 2010 03:29:05 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:34874 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757844Ab0KKI3C (ORCPT ); Thu, 11 Nov 2010 03:29:02 -0500 Date: Thu, 11 Nov 2010 09:28:43 +0100 From: Ingo Molnar To: Ming Lei Cc: Peter Zijlstra , Paul Mackerras , Arnaldo Carvalho de Melo , Russell King , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [Questions] How to run 'perf top' on ARM to profile kernel functions with modules loaded Message-ID: <20101111082843.GA32728@elte.hu> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -2.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Ming Lei wrote: > 2010/11/11 Ming Lei : > > Hi, > > > > 'perf top' can't display any functions when modules are loaded on ARM. > > Sorry, should be can't display any kernel functions when modules are loaded > on ARM. > > Also, when modules are loaded, 'perf report' can't display functions names, > follows result of 'perf report': > > root@beagleboard:~# perf report > # Events: 4K cycles > # > # Overhead Command Shared Object Symbol > # ........ ........... ................. ...................... > # > 97.36% swapper [musb_hdrc] [k] 10466c4 > 2.19% perf [musb_hdrc] [k] 10da070 > 0.09% ksoftirqd/0 [musb_hdrc] [k] 10db998 > 0.06% perf libc-2.9.so [.] memchr > 0.04% perf libc-2.9.so [.] 663c0 > 0.02% perf perf [.] 2e80 > 0.02% perf libc-2.9.so [.] closedir > 0.02% perf libc-2.9.so [.] __read > 0.02% flush-179:0 [musb_hdrc] [k] 10ff124 > 0.02% perf libc-2.9.so [.] memset > 0.02% perf libc-2.9.so [.] __memcpy_chk > 0.02% perf perf [.] event__synthesize_comm > 0.02% perf ffff0fc4 [.] ffff0fc4 > 0.02% perf perf [.] hex2u64 > 0.02% perf libc-2.9.so [.] _IO_vfprintf > 0.02% perf libc-2.9.so [.] fgets > 0.02% perf libpthread-2.9.so [.] flockfile > 0.02% perf perf [.] kallsyms__parse > 0.02% perf libc-2.9.so [.] _IO_getline_info > > Any suggestions or comments? Must be some bug in the ELF symbol handling code - we've had many cases of quirks and special cases there. Please run 'perf archive' and send the resulting perf.data.tar.bz2 to Arnaldo in private mail. (the file will be big) Thanks, Ingo