linux-kernel - Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges

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Message-ID: <20080227224232.GA18581@sgi.com>
Date:	Wed, 27 Feb 2008 16:42:32 -0600
From:	Jack Steiner <steiner@....com>
To:	Christoph Lameter <clameter@....com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>, akpm@...ux-foundation.org,
	Andrea Arcangeli <andrea@...ranet.com>,
	Robin Holt <holt@....com>, Avi Kivity <avi@...ranet.com>,
	Izik Eidus <izike@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	general@...ts.openfabrics.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rdreier@...co.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges

>  
> > Also, what we are going to need here are not skeleton drivers
> > that just do all the *easy* bits (of registering their callbacks),
> > but actual fully working examples that do everything that any
> > real driver will need to do. If not for the sanity of the driver
> > writer, then for the sanity of the VM developers (I don't want
> > to have to understand xpmem or infiniband in order to understand
> > how the VM works).
> 
> There are 3 different drivers that can already use it but the code is 
> complex and not easy to review. Skeletons are easy to allow people to get 
> started with it.


I posted the full GRU driver late last week. It is a lot of
code & somewhat difficult to understand w/o access to full chip
specs (sorry). The code is fairly well commented &  the
parts related to TLB management should be understandable.


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