From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 3 Jul 2003 09:06:32 -0400 (EDT) From: Rik van Riel Subject: Re: What to expect with the 2.6 VM In-Reply-To: <20030703125839.GZ23578@dualathlon.random> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Andrea Arcangeli Cc: William Lee Irwin III , "Martin J. Bligh" , Mel Gorman , Linux Memory Management List , Linux Kernel Mailing List List-ID: On Thu, 3 Jul 2003, Andrea Arcangeli wrote: > even if you don't use largepages as you should, the ram cost of the pte > is nothing on 64bit archs, all you care about is to use all the mhz and > tlb entries of the cpu. That depends on the number of Oracle processes you have. Say that page tables need 0.1% of the space of the virtual space they map. With 1000 Oracle users you'd end up needing as much memory in page tables as your shm segment is large. Of course, in this situation either the application should use large pages or the kernel should simply reclaim the page tables (possible while holding the mmap_sem for write). > remap_file_pages is useful only for VLM in 32bit Agreed on that. Please let the monstrosity die together with 32 bit machines ;) -- 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