[Xen-devel] shared-memory filesystem

["King, Steven R" <steven.r.king@xxxxxxxxx>]

Hi Mark,

Will your Xen guest memory sharing approach create OS portability
headaches?  It would obviously be desirable to maintain one general
scheme that works in *nix, Windows, etc.  Windows processes can map
files with MapViewOfFile(), but my understanding is that creating a
Windows file system is difficult.

Sending IOCTL's to exotic character devices is boring and not half as
elegant, but isn't it the most portable approach?

-steve

-----Original Message-----
From: Mark Williamson [mailto:mark.williamson@xxxxxxxxxxxx] 
Sent: Thursday, November 03, 2005 3:22 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: Christopher Clark; King, Steven R; NAHieu
Subject: Re: [Xen-devel] Question on xc_gnttab_map_grant_ref()

To expand:

I'm working towards a shared-memory NFS-style filesystem for Xen guests.
This will allow high-performance data sharing within one host.  This
leverages direct memory sharing to maximise performance and make better
use of the available RAM.

A bonus feature of this direct sharing approach is that applications
running in different domains on the same host should be able to share
memory by both using a simple mmap() call.  This avoids us having to
introduce any new wacky semantics / exotic character devices; sharing
should work similarly to the case of two applications in one domain.

Cheers,
Mark

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