From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 3 Mar 2003 08:50:34 -0800 (PST) From: Linus Torvalds Subject: Re: [patch] remap-file-pages-2.5.63-A0 In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Ingo Molnar Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: On Mon, 3 Mar 2003, Ingo Molnar wrote: > > the attached patch, against BK-curr, is a preparation to make > remap_file_pages() usable on swappable vmas as well. When 'swapping out' > shared-named mappings the page offset is written into the pte. > > it takes one bit from the swap-type bits, otherwise it does not change the > pte layout - so it should be easy to adapt any other architecture to this > change as well. (this patch does not introduce the protection-bits-in-pte > approach used in my previous patch.) One question: Why? What's wrong with just using the value we use now (0), and just calculating the page from the vma/offset information? Why hide the offset in the page tables, when there is no need for it? 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: aart@kvack.org