From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from petasus.jf.intel.com (petasus.jf.intel.com [10.7.209.6]) by hermes.jf.intel.com (8.11.6/8.11.6/d: outer.mc,v 1.48 2002/05/24 00:39:04 root Exp $) with ESMTP id g721WK009915 for ; Fri, 2 Aug 2002 01:32:20 GMT Received: from orsmsxvs040.jf.intel.com (orsmsxvs040.jf.intel.com [192.168.65.206]) by petasus.jf.intel.com (8.11.6/8.11.6/d: inner.mc,v 1.22 2002/05/24 00:38:22 root Exp $) with SMTP id g721Vng00218 for ; Fri, 2 Aug 2002 01:31:49 GMT Message-ID: <25282B06EFB8D31198BF00508B66D4FA03EA56B3@fmsmsx114.fm.intel.com> From: "Seth, Rohit" Subject: RE: large page patch Date: Thu, 1 Aug 2002 18:34:04 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Sender: owner-linux-mm@kvack.org Return-Path: To: "'David S. Miller'" , akpm@zip.com.au Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Seth, Rohit" , "Saxena, Sunil" , "Mallick, Asit K" List-ID: There is typo in Andrew's mail. It is not 256K, but it is 256MB. -----Original Message----- From: David S. Miller [mailto:davem@redhat.com] Sent: Thursday, August 01, 2002 6:20 PM To: akpm@zip.com.au Cc: linux-kernel@vger.kernel.org; linux-mm@kvack.org; rohit.seth@intel.com; sunil.saxena@intel.com; asit.k.mallick@intel.com Subject: Re: large page patch From: Andrew Morton Date: Thu, 01 Aug 2002 18:26:40 -0700 "David S. Miller" wrote: > This is probably done to increase the likelyhood that 4MB page orders > are available. If we collapse 4MB pages deeper, they are less likely > to be broken up because smaller orders would be selected first. This is leakage from ia64, which supports up to 256k pages. Ummm, 4MB > 256K and even with a 4K PAGE_SIZE MAX_ORDER coalesces up to 4MB already :-) Apparently a page-table based representation could not be used by PPC. The page-table is just an abstraction, there is no reason dummy "large" ptes could not be used which are just ignored by the HW TLB reload code. -- 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/