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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0802141133430.477@schroedinger.engr.sgi.com>
Date:	Thu, 14 Feb 2008 11:35:37 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Kanoj Sarcar <kanojsarcar@...oo.com>
cc:	Christian Bell <christian.bell@...gic.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	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, Kanoj Sarcar wrote:

> Oh ok, yes, I did see the discussion on this; sorry I
> missed it. I do see what notifiers bring to the table
> now (without endorsing it :-)).
> 
> An orthogonal question is this: is IB/rdma the only
> "culprit" that elevates page refcounts? Are there no
> other subsystems which do a similar thing?

Yes there are actually two projects by SGI that also ran into the same 
issue that motivated the work on this. One is XPmem which allows 
sharing of process memory between different Linux instances and then 
there is the GRU which is a kind of DMA engine. Then there is KVM and 
probably multiple other drivers.
--
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/