From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 9478D5F0019 for ; Wed, 3 Jun 2009 13:28:26 -0400 (EDT) Date: Wed, 3 Jun 2009 10:28:07 -0700 (PDT) From: Linus Torvalds Subject: Re: Security fix for remapping of page 0 (was [PATCH] Change ZERO_SIZE_PTR to point at unmapped space) In-Reply-To: <7e0fb38c0906031016m77416390v37fb0673e6e50501@mail.gmail.com> Message-ID: References: <20090530192829.GK6535@oblivion.subreption.com> <20090531022158.GA9033@oblivion.subreption.com> <20090602203405.GC6701@oblivion.subreption.com> <1244041914.12272.64.camel@localhost.localdomain> <20090603162831.GF6701@oblivion.subreption.com> <4A26A689.1090300@redhat.com> <7e0fb38c0906031016m77416390v37fb0673e6e50501@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Eric Paris Cc: Rik van Riel , "Larry H." , Christoph Lameter , Stephen Smalley , linux-mm@kvack.org, Alan Cox , linux-kernel@vger.kernel.org, pageexec@freemail.hu List-ID: On Wed, 3 Jun 2009, Eric Paris wrote: > > I am at least interested in hearing about the 'performance plummet.' It's perhaps not so much SElinux itself, but the AUDIT support (which it requires) that is really _very_ noticeable on microbenchmarks. Last time I ran lmbench on a Fedora kernel it was horrible. Turning off AUDIT (which also turns off SElinux) fixes it. It may be crazy distro auditing rules or whatever, but that doesn't change the basic issue. Linus -- 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