Re: Replacement for page fault notifiers?

[Andi Kleen]

Arjan van de Ven <arjan@xxxxxxxxxxxxx> 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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