From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933632AbbCRToG (ORCPT ); Wed, 18 Mar 2015 15:44:06 -0400 Received: from shards.monkeyblade.net ([149.20.54.216]:37485 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932762AbbCRToE (ORCPT ); Wed, 18 Mar 2015 15:44:04 -0400 Date: Wed, 18 Mar 2015 15:43:59 -0400 (EDT) Message-Id: <20150318.154359.1325469409095627387.davem@davemloft.net> To: david.ahern@oracle.com Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org Subject: Re: maps mismatch in /proc/kcore for sparc From: David Miller In-Reply-To: <5509AE36.8040902@oracle.com> References: <5509AE36.8040902@oracle.com> X-Mailer: Mew version 6.5 on Emacs 24.1 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: David Ahern Date: Wed, 18 Mar 2015 10:56:22 -0600 > I am trying to understand why the perf tool on sparc fails to convert > kernel symbols when /proc/kcore is used. I have instrumented perf to > the point I can see that it drops symbols from kallsyms because it > cannot find a corresponding map when the kernel maps are created based > on parsing /proc/kcore. I'm looking into this, I think we need to set ARCH_PROC_KCORE_TEXT in arch/sparc/Kconfig I have an even worse problem on my T4 system, /proc/kcore is zero length. Looking into that now as well.