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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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