linux-kernel - Re: [PATCH] x86: Add a list for custom page fault handlers.

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Message-ID: <20080130102047.59aae047@laptopd505.fenrus.org>
Date:	Wed, 30 Jan 2008 10:20:47 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Pekka Paalanen <pq@....fi>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	"Jan Beulich" <jbeulich@...ell.com>, pq@....fi
Subject: Re: [PATCH] x86: Add a list for custom page fault handlers.

On Sun, 27 Jan 2008 18:52:38 +0200
Pekka Paalanen <pq@....fi> wrote:

> From: Pekka Paalanen <pq@....fi>
> 
> Provides kernel modules a way to register custom page fault handlers.
> On every page fault, except those handled in vmalloc_fault(), this
> will call a list of registered functions. The functions may handle
> the fault and force do_page_fault() to return immediately.
> 
> This functionality is similar to the now removed page fault notifiers.
> Custom page fault handlers are used by debugging and reverse
> engineering tools. Mmio-trace is one such tool and a patch to add it
> into the tree will follow.
> 
> The custom page fault handlers are called from the exact same points
> in do_page_fault() as the page fault notifiers were.

to be honest I don't like this approach.
I fully would like to see mmio tracing in the kernel, but please 
make the hook explicit and direct (eg call the mmio tracing function,
not some list) instead...


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