linux-kernel - Re: [LSF/MM TOPIC] userfaultfd

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Message-ID: <54B7E5FC.3080006@gmail.com>
Date:	Thu, 15 Jan 2015 11:08:28 -0500
From:	Austin S Hemmelgarn <ahferroin7@...il.com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	lsf-pc@...ts.linux-foundation.org
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [LSF/MM TOPIC] userfaultfd

On 2015-01-14 18:01, Andrea Arcangeli wrote:
> 7) distributed shared memory that could allow simultaneous mapping of
>     regions marked readonly and collapse them on the first exclusive
>     write. I'm mentioning it as a corollary, because I'm not aware of
>     anybody who is planning to use it that way (still I'd like that
>     this will be possible too just in case it finds its way later on).
While I haven't actually written any code for it yet, I've been thinking 
about the possibility to use this to allow qemu to do distributed 
emulation of a NUMA system (ie, you could run qemu on a Beowulf cluster 
and make it look to the guest OS like it's running on a big NUMA system, 
essentially SSI clustering for people who don't have a multi-million 
dollar budget).  Having userfaultd to work with would make this 
exponentially easier to implement.


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