From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 2F2636B00B2 for ; Fri, 7 Jan 2011 11:31:24 -0500 (EST) Date: Fri, 7 Jan 2011 10:31:19 -0600 (CST) From: Christoph Lameter Subject: Re: Very large memory configurations: > 16 TB In-Reply-To: <20110107125135.GD20761@elte.hu> Message-ID: References: <20110106170942.GA8253@sgi.com> <20110107125135.GD20761@elte.hu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Jack Steiner Cc: Ingo Molnar , linux-mm@kvack.org, linux-ia64@vger.kernel.org List-ID: Andi put a description of the memory layout in Documentation/x86/x86_64/mm.txt. Seems to indicate that 64 TB was considered as a maximum when the memory layout for x86_64 was set up: ------ Virtual memory map with 4 level page tables: 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension ffff800000000000 - ffff80ffffffffff (=40 bits) guard hole ffff880000000000 - ffffc7ffffffffff (=64 TB) direct mapping of all phys. memory ffffc80000000000 - ffffc8ffffffffff (=40 bits) hole ffffc90000000000 - ffffe8ffffffffff (=45 bits) vmalloc/ioremap space ffffe90000000000 - ffffe9ffffffffff (=40 bits) hole ffffea0000000000 - ffffeaffffffffff (=40 bits) virtual memory map (1TB) ... unused hole ... ffffffff80000000 - ffffffffa0000000 (=512 MB) kernel text mapping, from phys 0 ffffffffa0000000 - fffffffffff00000 (=1536 MB) module mapping space The direct mapping covers all memory in the system up to the highest memory address (this means in some cases it can also include PCI memory holes). vmalloc space is lazily synchronized into the different PML4 pages of the processes using the page fault handler, with init_level4_pgt as reference. Current X86-64 implementations only support 40 bits of address space, but we support up to 46 bits. This expands into MBZ space in the page tables. -Andi Kleen, Jul 2004 -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org