Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754492Ab0HWTX0 (ORCPT ); Mon, 23 Aug 2010 15:23:26 -0400 Received: from claw.goop.org ([74.207.240.146]:53806 "EHLO claw.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754469Ab0HWTXX (ORCPT ); Mon, 23 Aug 2010 15:23:23 -0400 Message-ID: <4C72CAA7.5070202@goop.org> Date: Mon, 23 Aug 2010 12:23:19 -0700 From: Jeremy Fitzhardinge User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.7) Gecko/20100720 Fedora/3.1.1-1.fc13 Lightning/1.0b2pre Thunderbird/3.1.1 MIME-Version: 1.0 To: Peter Zijlstra CC: Linus Torvalds , Ian Jackson , Greg KH , Ian Campbell , linux-kernel@vger.kernel.org, stable@kernel.org, stable-review@kernel.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk Subject: Re: [RFC] mlock/stack guard interaction fixup References: <1282391770.29609.1223.camel@localhost.localdomain> <1282460275.11348.865.camel@localhost.localdomain> <1282462386.11348.871.camel@localhost.localdomain> <1282470917.11348.891.camel@localhost.localdomain> <20100822172548.GB8957@suse.de> <19570.38608.79434.179797@chiark.greenend.org.uk> <1282580751.2605.1997.camel@laptop> <19570.44367.719276.128881@chiark.greenend.org.uk> <4C72C2E9.3070408@goop.org> <1282590457.2605.2200.camel@laptop> In-Reply-To: <1282590457.2605.2200.camel@laptop> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 650 Lines: 17 On 08/23/2010 12:07 PM, Peter Zijlstra wrote: > mlock() simply avoids major faults, nothing more. > > I think both page migration and page-out for shared pages where some > maps are !mlocked can cause unmaps and thus minor faults. > > mlock and dirty do not interact, they will still be cleaned/written out > as normal. So mlock is useless for preventing secret stuff from being written to disk. J -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/