From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 23 Jan 2006 20:23:31 -0500 From: Benjamin LaHaise Subject: Re: [PATCH/RFC] Shared page tables Message-ID: <20060124012331.GK1008@kvack.org> References: <200601240139.46751.ak@suse.de> <200601231853.54948.raybry@mpdtxmail.amd.com> <200601240210.04337.ak@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200601240210.04337.ak@suse.de> Sender: owner-linux-mm@kvack.org Return-Path: To: Andi Kleen Cc: Ray Bryant , Dave McCracken , Robin Holt , Hugh Dickins , Linux Kernel , Linux Memory Management List-ID: On Tue, Jan 24, 2006 at 02:10:03AM +0100, Andi Kleen wrote: > The randomization is not for cache coloring, but for security purposes > (except for the old very small stack randomization that was used > to avoid conflicts on HyperThreaded CPUs). I would be surprised if the > mmap made much difference because it's page aligned and at least > on x86 the L2 and larger caches are usually PI. Actually, does this even affect executable segments? Iirc, prelinking already results in executables being mapped at the same physical offset across binaries in a given system. An strace seems to confirm that. -ben -- "Ladies and gentlemen, I'm sorry to interrupt, but the police are here and they've asked us to stop the party." Don't Email: . -- 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