From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue, 24 May 2005 13:59:30 -0700 (PDT)
From: Christoph Lameter <christoph@lameter.com>
Subject: Re: [Lhms-devel] Re: [PATCH 2.6.12-rc3 1/8] mm: manual page
 migration-rc2 -- xfs-extended-attributes-rc2.patch
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To: Ray Bryant <raybry@engr.sgi.com>
Cc: Steve Longerbeam <stevel@mwwireless.net>, Christoph Hellwig <hch@infradead.org>, Andi Kleen <ak@suse.de>, Ray Bryant <raybry@sgi.com>, Hirokazu Takahashi <taka@valinux.co.jp>, Marcelo Tosatti <marcelo.tosatti@cyclades.com>, Dave Hansen <haveblue@us.ibm.com>, linux-mm <linux-mm@kvack.org>, Nathan Scott <nathans@sgi.com>, Ray Bryant <raybry@austin.rr.com>, lhms-devel@lists.sourceforge.net, Jes Sorensen <jes@wildopensource.com>
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On Mon, 23 May 2005, Ray Bryant wrote:

> We need to take a different migration action based on which case we
> are in:
> 
> (1)  Migrate all of the pages.
> (2)  Migrate the non-shared pages.
> (3)  Migrate none of the pages.
> 
> So we need some external way for the kernel to be told which kind of
> mapped file this is.  That is why we need some kind of interface for
> the user (or admininistrator) to tell us how to classify each shared
> mapped file.

Sorry I am a bit late to the party and I know you must have said this
before but what is the reason again not to use the page reference count to 
determine if a page is shared? Maybe its possible to live with some 
restrictions that the use of the page reference count brings.

Seems that touching a filesystem and the ELF headers is way off from the 
vm.


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