From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264571AbUGOUNL (ORCPT ); Thu, 15 Jul 2004 16:13:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265885AbUGOUNL (ORCPT ); Thu, 15 Jul 2004 16:13:11 -0400 Received: from [192.48.179.6] ([192.48.179.6]:60420 "EHLO omx1.americas.sgi.com") by vger.kernel.org with ESMTP id S264571AbUGOUNH (ORCPT ); Thu, 15 Jul 2004 16:13:07 -0400 Subject: add core dump file name pattern option for cpu id From: Joshua Aas To: linux-kernel@vger.kernel.org Content-Type: text/plain Message-Id: <1089922482.4644.7.camel@coetzee.americas.sgi.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Thu, 15 Jul 2004 15:14:43 -0500 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Normally core dumps can be blamed on a program itself. However, core dumps can also be the result of faulty hardware. Tracking down what CPU a failure occurred on usually requires that hardware be powered off piece by piece until no core dumps occur (on big machines this can take a long time). Another option is to run the test pinned to each CPU until the core dump occurs, but this can also take a long time on big machines. It would be very beneficial if the kernel was capable of making the CPU ID of the CPU the core dump occurred on available somehow. The following patch adds an option (%c) to the core dump file naming pattern convention for putting the CPU ID into core dump file names. Signed-off-by: Josh Aas ----------------------------------------------------------------- --- a/fs/exec.c 2004-07-13 14:32:24.000000000 -0500 +++ b/fs/exec.c 2004-07-15 13:16:17.000000000 -0500 @@ -1276,6 +1276,14 @@ void format_corename(char *corename, con goto out; out_ptr += rc; break; + /* cpu id */ + case 'c': + rc = snprintf(out_ptr, out_end - out_ptr, + "%d", smp_processor_id()); + if (rc > out_end - out_ptr) + goto out; + out_ptr += rc; + break; default: break; } ----------------------------------------------------------------- -- Josh Aas Silicon Graphics, Inc. (SGI) Linux System Software 651-683-3068