From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753970AbZGJJkf (ORCPT ); Fri, 10 Jul 2009 05:40:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751891AbZGJJk2 (ORCPT ); Fri, 10 Jul 2009 05:40:28 -0400 Received: from courier.cs.helsinki.fi ([128.214.9.1]:48139 "EHLO mail.cs.helsinki.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751348AbZGJJk2 (ORCPT ); Fri, 10 Jul 2009 05:40:28 -0400 Subject: Re: [RFC][PATCH] Check write to slab memory which freed already using mudflap From: Pekka Enberg To: Nick Piggin Cc: Ingo Molnar , Janboe Ye , linux-kernel@vger.kernel.org, vegard.nossum@gmail.com, fche@redhat.com, cl@linux-foundation.org In-Reply-To: <20090710092921.GF14666@wotan.suse.de> References: <1247156020.27671.40.camel@debian-nb> <84144f020907090944u51f60cbsc0a4ec2c2cbdcc8c@mail.gmail.com> <20090710084745.GA26752@elte.hu> <1247215920.32044.3.camel@penberg-laptop> <20090710090351.GD14666@wotan.suse.de> <1247217263.771.8.camel@penberg-laptop> <20090710092921.GF14666@wotan.suse.de> Date: Fri, 10 Jul 2009 12:40:26 +0300 Message-Id: <1247218826.771.15.camel@penberg-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 7bit X-Mailer: Evolution 2.24.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Nick, On Fri, 2009-07-10 at 11:29 +0200, Nick Piggin wrote: > What I would like to see is we eventualy make the hard decision > and cull 2 of them. If SLQB is not clearly better (or, if it is > clearly worse) than the other allocators and it can't be improved, > then it has failed my goals for it and I would prefer to remove it > from the tree. I'm not sure it's such a hard decision. SLAB is on it's way out because SLUB and SLQB code are much cleaner and the debugging support is better. As for SLUB vs. SLQB, I'm hoping to trick you, Mel, and others into doing an "epic slab allocator performance battle" and post the numbers once we have have everything merged to mainline. My gut feeling is that SLQB is in the lead because SLUB hasn't addressed the Intel regression. Pekka