linux-kernel - Re: [ofa-general] Re: Demand paging for memory regions

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Message-ID: <Pine.LNX.4.64.0802271409480.13186@schroedinger.engr.sgi.com>
Date:	Wed, 27 Feb 2008 14:11:19 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
cc:	Pete Wyckoff <pw@....edu>, Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <andrea@...ranet.com>, a.p.zijlstra@...llo.nl,
	izike@...ranet.com, Roland Dreier <rdreier@...co.com>,
	steiner@....com, linux-kernel@...r.kernel.org, avi@...ranet.com,
	linux-mm@...ck.org, daniel.blueman@...drics.com,
	Robin Holt <holt@....com>, general@...ts.openfabrics.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	kvm-devel@...ts.sourceforge.net
Subject: Re: [ofa-general] Re: Demand paging for memory regions

On Wed, 13 Feb 2008, Jason Gunthorpe wrote:

> Christoph: It seemed to me you were first talking about
> freeing/swapping/faulting RDMA'able pages - but would pure migration
> as a special hardware supported case be useful like Catilan suggested?

That is a special case of the proposed solution. You could mlock the 
regions of interest. Those can then only be migrated but not swapped out.

However, I think we need some limit on the number of pages one can mlock. 
Otherwise the VM can get into a situation where reclaim is not possible 
because the majority of memory is either mlocked or pinned by I/O etc.

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