From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752005AbaHTADK (ORCPT ); Tue, 19 Aug 2014 20:03:10 -0400 Received: from qmta07.emeryville.ca.mail.comcast.net ([76.96.30.64]:41488 "EHLO qmta07.emeryville.ca.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751647AbaHTADI (ORCPT ); Tue, 19 Aug 2014 20:03:08 -0400 Date: Tue, 19 Aug 2014 19:03:03 -0500 (CDT) From: Christoph Lameter X-X-Sender: cl@gentwo.org To: Laura Abbott cc: Dave Hansen , linux-kernel@vger.kernel.org, dave.hansen@linux.intel.com, peterz@infradead.org, mingo@redhat.com, ak@linux.intel.com, tim.c.chen@linux.intel.com, akpm@linux-foundation.org, penberg@kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] [RFC] TAINT_PERFORMANCE In-Reply-To: <53F3E1FE.1000508@codeaurora.org> Message-ID: References: <20140819212604.6C94DF09@viggo.jf.intel.com> <53F3E1FE.1000508@codeaurora.org> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 19 Aug 2014, Laura Abbott wrote: > I nominate CONFIG_DEBUG_PAGEALLOC, CONFIG_SLUB_DEBUG, > CONFIG_SLUB_DEBUG_ON as well since I've wasted days debugging > supposed performance issues where those were on. CONFIG_SLUB_DEBUG is not enabling debugging. It just includes the code to do so at kernel bootup. Not a performance problem. CONFIG_SLUB_DEBUG_ON is a performance issue since debugging will be on by default. CONFIG_SLAB_DEBUG is also a performance issue since this option makes slab run with debugging.