From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Date: Wed, 18 Mar 2015 19:57:59 +0000 Subject: Re: maps mismatch in /proc/kcore for sparc Message-Id: <5509D8C7.5080504@oracle.com> List-Id: References: <5509AE36.8040902@oracle.com> <20150318.154359.1325469409095627387.davem@davemloft.net> In-Reply-To: <20150318.154359.1325469409095627387.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: David Miller Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org On 3/18/15 1:43 PM, David Miller wrote: > 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 Missed that config in my fumbling through the kcore code. Adding it to sparc/Kconfig and it works. map is added: kcore_mapfn: dso [kernel.kallsyms]: new map from 404000 to e33d79 and kernel symbols are not dropped. One mystery solved. Thanks, David From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756327AbbCRT6G (ORCPT ); Wed, 18 Mar 2015 15:58:06 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:30380 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754099AbbCRT6B (ORCPT ); Wed, 18 Mar 2015 15:58:01 -0400 Message-ID: <5509D8C7.5080504@oracle.com> Date: Wed, 18 Mar 2015 13:57:59 -0600 From: David Ahern User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: David Miller CC: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org Subject: Re: maps mismatch in /proc/kcore for sparc References: <5509AE36.8040902@oracle.com> <20150318.154359.1325469409095627387.davem@davemloft.net> In-Reply-To: <20150318.154359.1325469409095627387.davem@davemloft.net> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/18/15 1:43 PM, David Miller wrote: > 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 Missed that config in my fumbling through the kcore code. Adding it to sparc/Kconfig and it works. map is added: kcore_mapfn: dso [kernel.kallsyms]: new map from 404000 to e33d79 and kernel symbols are not dropped. One mystery solved. Thanks, David