From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934626AbZHEPIu (ORCPT ); Wed, 5 Aug 2009 11:08:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S934577AbZHEPIu (ORCPT ); Wed, 5 Aug 2009 11:08:50 -0400 Received: from turing-police.cc.vt.edu ([128.173.14.107]:44801 "EHLO turing-police.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933605AbZHEPIt (ORCPT ); Wed, 5 Aug 2009 11:08:49 -0400 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2 To: Andrew Morton Cc: Ingo Molnar , penberg@cs.helsinki.fi, a.p.zijlstra@chello.nl, fweisbec@gmail.com, rostedt@goodmis.org, mel@csn.ul.ie, lwoodman@redhat.com, riel@redhat.com, peterz@infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events In-Reply-To: Your message of "Tue, 04 Aug 2009 13:18:18 PDT." <20090804131818.ee5d4696.akpm@linux-foundation.org> From: Valdis.Kletnieks@vt.edu References: <1249409546-6343-1-git-send-email-mel@csn.ul.ie> <1249409546-6343-5-git-send-email-mel@csn.ul.ie> <20090804112246.4e6d0ab1.akpm@linux-foundation.org> <20090804195717.GA5998@elte.hu> <20090804131818.ee5d4696.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1249484839_3824P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Wed, 05 Aug 2009 11:07:19 -0400 Message-ID: <16859.1249484839@turing-police.cc.vt.edu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1249484839_3824P Content-Type: text/plain; charset=us-ascii On Tue, 04 Aug 2009 13:18:18 PDT, Andrew Morton said: > As usual, we're adding tracepoints because we feel we must add > tracepoints, not because anyone has a need for the data which they > gather. One of the strong points of the Solaris 'dtrace' is that the kernel comes pre-instrumented with zillions of tracepoints, including a lot that don't seem to have very much application - just so they're already in place in case you hit some weird issue and need the tracepoint for an ad-crock dtrace script to debug something. So when I'm trying to diagnose why my backup server suddenly got sluggish 3 terabytes into a 5 terabyte backup, and it looks like some weird fiberchannel issue, I can collect data without having to reboot to install a tracepoint (which would lose the backup, and possibly reset the issue or otherwise make it go into hiding). Just sayin'. :) --==_Exmh_1249484839_3824P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFKeaAncC3lWbTT17ARAtwEAJ0am+oset6/fbEDDzGOBtdp4Pg4UwCfXs60 s8pZGjPrLA/XchwVAvEW4Ic= =CRJO -----END PGP SIGNATURE----- --==_Exmh_1249484839_3824P--