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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>,
	Christoph Hellwig <hch@infradead.org>,
	Pavel Roskin <proski@gnu.org>, Dave Airlie <airlied@gmail.com>,
	Pekka Paalanen <pq@iki.fi>,
	linux-kernel@vger.kernel.org, jbeulich@novell.com
Subject: Re: Replacement for page fault notifiers?
Date: Thu, 10 Jan 2008 11:58:45 +1100	[thread overview]
Message-ID: <1199926725.6734.161.camel@pasglop> (raw)
In-Reply-To: <20080109165515.4a6256a8@laptopd505.fenrus.org>


On Wed, 2008-01-09 at 16:55 -0800, Arjan van de Ven wrote:
> > That would assume that your mmio area has a struct page. In most
> PCs 
> > the ones in the PCI hole don't
> > 
> 
> so you also call the function for all traps on pages without struct
> page;
> that should be extremely rare anyway, and the mmio_trace code can
> then 
> look the page up.

Not that rare if you use a modern DRI :-)

In fact, the thing here is that it's mostly kernel mappings though, not
user mappings. So we never get there, we die before we even reach
generic code most of the time iirc.

The whole ioremap stuff is very platform specific, not everybody even
uses the code in mm/vmalloc.c for it, so at this stage, I see no other
option but a hook in do_page_fault().

Cheers,
Ben.


  reply	other threads:[~2008-01-10  0:59 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-08 19:06 Pekka Paalanen
2008-01-08 20:32 ` Christoph Hellwig
2008-01-08 22:13   ` Dave Airlie
2008-01-09  0:26     ` Benjamin Herrenschmidt
2008-01-09 18:18       ` Pavel Roskin
2008-01-09 18:21         ` Christoph Hellwig
2008-01-09 19:58           ` Benjamin Herrenschmidt
2008-01-09 20:22             ` Christoph Hellwig
2008-01-10  0:42               ` Arjan van de Ven
2008-01-10  0:47                 ` Andi Kleen
2008-01-10  0:55                   ` Arjan van de Ven
2008-01-10  0:58                     ` Benjamin Herrenschmidt [this message]
2008-01-10  1:01                     ` Andi Kleen
2008-01-10  0:56                 ` Benjamin Herrenschmidt
2008-01-10  2:03                 ` Matt Mackall
2008-01-10  2:21                   ` Pavel Roskin
2008-01-10  2:30                     ` Matt Mackall
2008-01-10 18:44               ` Pekka Paalanen
2008-01-09 20:24             ` Pavel Roskin
2008-01-09 20:26               ` Christoph Hellwig
2008-01-09 20:41                 ` Pavel Roskin
2008-01-09 20:44                 ` Valdis.Kletnieks

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