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Re: [Xen-devel] Copy-on-write memory to allow many more xenU domains per

To: Jacob Gorm Hansen <jacob@xxxxxxxx>
Subject: Re: [Xen-devel] Copy-on-write memory to allow many more xenU domains per machine
From: Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>
Date: Tue, 02 Nov 2004 21:33:00 +0000
Cc: Michael Vrable <mvrable@xxxxxxxxxxx>, Xen-devel@xxxxxxxxxxxxxxxxxxxxx, Ian.Pratt@xxxxxxxxxxxx
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> What about having a special variant of the pte-update operation, which 
> takes as input a pointer to a pte-entry, and will change that entry into 
> a read-only mapping of the same page contents, though perhaps with a 
> different frame number in the pte.

I'm still not convinced we wouldn't get most of the benefit by
just sharing pages read from the block/file system, and hence
avoiding all the hashing. 

Collecting this data is actually very easy -- its just a case of
coming up with a few "realistic usage scenarios" in which to
collect the data. We'd be happy to work with someone to do


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