From: urmk@reason.marist.edu
To: Ian Pratt <Ian.Pratt@cl.cam.ac.uk>
Cc: Xen-devel@lists.sourceforge.net
Subject: Re: Copy-on-write memory to allow many more xenU domains per machine
Date: Tue, 2 Nov 2004 16:50:54 -0500 [thread overview]
Message-ID: <20041102215054.GA30274@reason.marist.edu> (raw)
In-Reply-To: <E1CP6Gz-0008CU-00@mta1.cl.cam.ac.uk>
Check the s/390 port of the kernel for the XIP2 filesystem. It exploits
the z/VM shared memory system to make a read-only ext2 like filesystem
that is shared amonst all the guests - and uses execute-in-place. Any
binaries on the xip2 filesystem aren't cached into local shared memory,
they're just mapped across.
This lets an admin build explicit shared systems, does shared ro-memory
nicely, etc. Might be worth looking into implementing similar in Xen.
Apologies if this was already discussed/noticed,
-m
On Tue, Nov 02, 2004 at 09:33:00PM +0000, Ian Pratt wrote:
>
> > 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
> this...
>
> Ian
>
>
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prev parent reply other threads:[~2004-11-02 21:50 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-08 8:59 Shadow page tables? Chengyuan Li
2004-10-08 9:11 ` Keir Fraser
2004-10-10 2:52 ` Chengyuan Li
2004-10-12 18:50 ` Michael Vrable
2004-10-12 20:09 ` Andrew Warfield
2004-10-13 1:53 ` Michael Vrable
2004-10-21 8:38 ` Peri Hankey
2004-10-25 12:12 ` Copy-on-write memory to allow many more xenU domains per machine Peri Hankey
2004-10-25 12:21 ` Ian Pratt
2004-10-25 18:24 ` David Hopwood
2004-10-25 19:52 ` Ronald G. Minnich
2004-10-25 20:19 ` Ian Pratt
2004-10-25 22:38 ` Michael Vrable
2004-10-26 8:15 ` Peri Hankey
2004-10-26 18:30 ` Michael Vrable
2004-10-26 19:43 ` Ian Pratt
2004-10-26 22:19 ` Michael Vrable
2004-11-02 20:55 ` Jacob Gorm Hansen
2004-11-02 21:33 ` Ian Pratt
2004-11-02 21:50 ` urmk [this message]
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