From: Martin Bligh <mbligh@google.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"nickpiggin@yahoo.com.au" <nickpiggin@yahoo.com.au>,
"Lee.Schermerhorn@hp.com" <Lee.Schermerhorn@hp.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC][PATCH] overwride page->mapping [0/3] intro
Date: Wed, 12 Sep 2007 12:12:25 -0700 [thread overview]
Message-ID: <46E83A19.2090604@google.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0709121207400.1934@schroedinger.engr.sgi.com>
Christoph Lameter wrote:
> On Wed, 12 Sep 2007, Balbir Singh wrote:
>
>> We discussed the struct page size issue at VM summit. If I remember
>> correctly, Linus suggested that we consider using pfn's instead of
>> pointers for pointer members in struct page.
>
> How would that save any memory? On a system with 16TB memory and 4k page
> size you have at least 4 billion pfns which is the max that an unsigned
> int can handle. If the virtual address space is sparse or larger (like on
> IA64) then you need to use an int with more than 32 bit anyways.
Because nobody (sane) has 16TB of memory? ;-)
M.
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next prev parent reply other threads:[~2007-09-12 19:12 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-12 2:43 KAMEZAWA Hiroyuki
2007-09-12 2:45 ` [RFC][PATCH] overwride page->mapping [1/3] cleanup KAMEZAWA Hiroyuki
2007-09-12 2:47 ` [RFC][PATCH] overwride page->mapping [2/3] page_mapping_info KAMEZAWA Hiroyuki
2007-09-12 2:48 ` [RFC][PATCH] override page->mapping [3/3] mlock counter per page KAMEZAWA Hiroyuki
2007-09-12 8:42 ` [RFC][PATCH] overwride page->mapping [0/3] intro Balbir Singh
2007-09-12 13:28 ` KAMEZAWA Hiroyuki
2007-09-12 19:10 ` Christoph Lameter
2007-09-12 19:12 ` Martin Bligh [this message]
2007-09-12 19:17 ` Christoph Lameter
2007-09-13 0:32 ` KAMEZAWA Hiroyuki
2007-09-13 1:05 ` Christoph Lameter
2007-09-13 1:27 ` KAMEZAWA Hiroyuki
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