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: <20080226184914.FF3A.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue, 26 Feb 2008 18:52:00 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	glebn@...taire.com (Gleb Natapov)
Cc:	kosaki.motohiro@...fujitsu.com,
	Nick Piggin <nickpiggin@...oo.com.au>,
	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)

> > > > Can you change the spec?
> > >
> > > Not really. It will break all existing codes.
> > 
> > I meant as in eg. submit changes to MPI-3
>
> MPI spec tries to be backward compatible. And MPI-2 spec is 10 years
> old, but MPI-1 is still in a wider use. HPC is moving fast in terms of HW
> technology, but slow in terms of SW. Fortran is still hot there :)

Agreed.
many many people dislike incompatible specification change.

We should accept real world spec.


- kosaki


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