linux-kernel - Re: Demand paging for memory regions (was Re: MMU Notifiers V6)

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Message-ID: <47B2174E.5000708@opengridcomputing.com>
Date:	Tue, 12 Feb 2008 16:01:50 -0600
From:	Steve Wise <swise@...ngridcomputing.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	general@...ts.openfabrics.org,
	Christoph Lameter <clameter@....com>,
	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <andrea@...ranet.com>, a.p.zijlstra@...llo.nl,
	izike@...ranet.com, steiner@....com, linux-kernel@...r.kernel.org,
	avi@...ranet.com, linux-mm@...ck.org, daniel.blueman@...drics.com,
	Robin Holt <holt@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kvm-devel@...ts.sourceforge.net
Subject: Re: Demand paging for memory regions (was Re: MMU Notifiers V6)

Roland Dreier wrote:
> [Adding general@...ts.openfabrics.org to get the IB/RDMA people involved]
> 
> This thread has patches that add support for notifying drivers when a
> process's memory map changes.  The hope is that this is useful for
> letting RDMA devices handle registered memory without pinning the
> underlying pages, by updating the RDMA device's translation tables
> whenever the host kernel's tables change.
> 
> Is anyone interested in working on using this for drivers/infiniband?
> I am interested in participating, but I don't think I have enough time
> to do this by myself.

I don't have time, although it would be interesting work!

> 
> Also, at least naively it seems that this is only useful for hardware
> that has support for this type of demand paging, and can handle
> not-present pages, generating interrupts for page faults, etc.  I know
> that Mellanox HCAs should have this support; are there any other
> devices that can do this?
>

Chelsio's T3 HW doesn't support this.


Steve.
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