linux-kernel - Re: Replacement for page fault notifiers?

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Message-ID: <p73zlveo6az.fsf@bingen.suse.de>
Date:	Thu, 10 Jan 2008 01:47:16 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Pavel Roskin <proski@....org>, Dave Airlie <airlied@...il.com>,
	Pekka Paalanen <pq@....fi>, linux-kernel@...r.kernel.org,
	jbeulich@...ell.com
Subject: Re: Replacement for page fault notifiers?

Arjan van de Ven <arjan@...radead.org> writes:
>
> I'm btw all in favor of making mmio tracing full fledged kernel infrastructure.
> This doesn't mean "notifier" imo; this means a real flag in the struct page,
> and then the page fault code can do
>
> if (page->flags & FLAG_MMIO_TRACED)
> 	mmio_trace(page, regs, whatever..);
>
> (probably surrounded by a CONFIG_ ifdef)
> THis is a TON lighter than a notifier chain, and actually what you want,
> you don't really want a notifier, you want a call back when a special kind of
> page is touched.

That would assume that your mmio area has a struct page. In most PCs 
the ones in the PCI hole don't

-Andi
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