From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 22 Apr 2003 11:09:53 -0400 (EDT) From: Ingo Molnar Subject: Re: objrmap and vmtruncate In-Reply-To: <171070000.1051021955@[10.10.2.4]> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: "Martin J. Bligh" Cc: Andrew Morton , Andrea Arcangeli , mingo@elte.hu, hugh@veritas.com, dmccr@us.ibm.com, Linus Torvalds , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Tue, 22 Apr 2003, Martin J. Bligh wrote: > Oh, BTW. You're assuming no sharing of any pages in the above. Look what > happens if 1000 processes share the same page ... i'm not assuming anything - this is the per-process overhead. processes have well-known RAM overhead associated to the size (and fragmentation) of their virtual memory space, primarily caused by pagetables. My suggestion triples this cost [where pte chains double the costs], but leaves the scaling factor and generic characteristics the same. Ingo -- 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