linux-kernel - Re: [ofa-general] Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem)

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Message-ID: <20080226072137.GD26611@minantech.com>
Date:	Tue, 26 Feb 2008 09:21:37 +0200
From:	glebn@...taire.com (Gleb Natapov)
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Robin Holt <holt@....com>, steiner@....com,
	Andrea Arcangeli <andrea@...ranet.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Izik Eidus <izike@...ranet.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...ranet.com>,
	kvm-devel@...ts.sourceforge.net, daniel.blueman@...drics.com,
	general@...ts.openfabrics.org, akpm@...ux-foundation.org,
	Christoph Lameter <clameter@....com>
Subject: Re: [ofa-general] Re: [patch 5/6] mmu_notifier: Support for
	drivers with revers maps (f.e. for XPmem)

On Tue, Feb 26, 2008 at 05:11:32PM +1100, Nick Piggin wrote:
> > You are missing one point here.  The MPI specifications that have
> > been out there for decades do not require the process use a library
> > for allocating the buffer.  I realize that is a horrible shortcoming,
> > but that is the world we live in.  Even if we could change that spec,
> 
> Can you change the spec?
Not really. It will break all existing codes. MPI-2 provides a call for
memory allocation (and it's beneficial to use this call for some interconnects),
but many (most?) applications are still written for MPI-1 and those that
are written for MPI-2 mostly uses the old habit of allocating memory by malloc(),
or even use stack or BSS memory for communication buffer purposes.

--
			Gleb.
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