From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933988AbXGLQbs (ORCPT ); Thu, 12 Jul 2007 12:31:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759548AbXGLQbl (ORCPT ); Thu, 12 Jul 2007 12:31:41 -0400 Received: from ns2.suse.de ([195.135.220.15]:56336 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759086AbXGLQbk (ORCPT ); Thu, 12 Jul 2007 12:31:40 -0400 Date: Thu, 12 Jul 2007 18:31:23 +0200 From: Andrea Arcangeli To: David Chinner Cc: linux-kernel@vger.kernel.org Subject: Re: RFC: CONFIG_PAGE_SHIFT (aka software PAGE_SIZE) Message-ID: <20070712163123.GL28613@v2.random> References: <20070706222651.GG5777@v2.random> <20070708232031.GF12413810@sgi.com> <20070710101148.GJ1482@v2.random> <20070712001256.GI31489@sgi.com> <20070712111436.GG28613@v2.random> <20070712144449.GZ31489@sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070712144449.GZ31489@sgi.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 13, 2007 at 12:44:49AM +1000, David Chinner wrote: > That's crap. Just because a machine has lots of memory does not > make it OK to waste lots of memory. It's not just wasted, it lowers overhead all over the place. Yes, the benefit of wasting less pagecache may largely outweight the benefit of having a larger page size, but if you've a lot of memory perhaps your working set already fits in the cache, or perhaps you don't fit in the cache regardless of the page size.