From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 19 May 2007 11:25:12 -0700 (PDT) From: Christoph Lameter Subject: Re: [rfc] increase struct page size?! In-Reply-To: <20070519181501.GC19966@holomorphy.com> Message-ID: References: <20070518040854.GA15654@wotan.suse.de> <20070519012530.GB15569@wotan.suse.de> <20070519181501.GC19966@holomorphy.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: William Lee Irwin III Cc: Nick Piggin , Linux Kernel Mailing List , Linux Memory Management List , linux-arch@vger.kernel.org List-ID: On Sat, 19 May 2007, William Lee Irwin III wrote: > However, there are numerous optimizations and features made possible > with flag bits, which might as could be made cheap by padding struct > page up to the next highest power of 2 bytes with space for flag bits. Well the last time I tried to get this by Andi we became a bit concerned when we realized that the memory map would grow by 14% in size. Given that 4k page size challenged platforms have a huge amount of page structs that growth is significant. I think it would be fine to do it for IA64 with 16k page size but not for x86_64. -- 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