From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Ray Bryant" Subject: Re: [PATCH/RFC] Shared page tables Date: Mon, 23 Jan 2006 18:16:38 -0600 References: <20060117235302.GA22451@lnx-holt.americas.sgi.com> <200601231758.08397.raybry@mpdtxmail.amd.com> In-Reply-To: <200601231758.08397.raybry@mpdtxmail.amd.com> MIME-Version: 1.0 Message-ID: <200601231816.38942.raybry@mpdtxmail.amd.com> Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: owner-linux-mm@kvack.org Return-Path: To: Dave McCracken Cc: Robin Holt , Hugh Dickins , Linux Kernel , Linux Memory Management List-ID: On Monday 23 January 2006 17:58, Ray Bryant wrote: > ... And what kind of alignment constraints do we end up > under in order to make the sharing happen? (My guess would be that there > aren't any such constraints (well, page alignment.. :-) if we are just > sharing pte's.) > Oh, obviously that is not right as you have to share full pte pages. So on x86_64 I'm guessing one needs 2MB alignment in order to get the sharing to kick in, since a pte page maps 512 pages of 4 KB each. Best Regards, -- Ray Bryant AMD Performance Labs Austin, Tx 512-602-0038 (o) 512-507-7807 (c) -- 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