From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f169.google.com (mail-ig0-f169.google.com [209.85.213.169]) by kanga.kvack.org (Postfix) with ESMTP id 1542A6B0005 for ; Tue, 26 Jan 2016 09:57:32 -0500 (EST) Received: by mail-ig0-f169.google.com with SMTP id z14so60381861igp.1 for ; Tue, 26 Jan 2016 06:57:32 -0800 (PST) Received: from resqmta-ch2-08v.sys.comcast.net (resqmta-ch2-08v.sys.comcast.net. [2001:558:fe21:29:69:252:207:40]) by mx.google.com with ESMTPS id x4si119925igg.49.2016.01.26.06.57.30 for (version=TLS1_2 cipher=AES128-SHA bits=128/128); Tue, 26 Jan 2016 06:57:31 -0800 (PST) Date: Tue, 26 Jan 2016 08:57:29 -0600 (CST) From: Christoph Lameter Subject: Re: [RFC][PATCH 0/3] Speed up SLUB poisoning + disable checks In-Reply-To: <1453770913-32287-1-git-send-email-labbott@fedoraproject.org> Message-ID: References: <1453770913-32287-1-git-send-email-labbott@fedoraproject.org> Content-Type: text/plain; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Laura Abbott Cc: Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-hardening@lists.openwall.com, Kees Cook On Mon, 25 Jan 2016, Laura Abbott wrote: > slub_debug=-: 7.437 > slub_debug=-: 7.932 So thats an almost 10% performance regression if the feature is not used. The reason that posoning is on the slow path is because it is impacting performance. Focus on optimizing the debug path without impacting the fast path please. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org