Re: [patch 3/3] mm: fault handler to replace nopage and populate

[Nick Piggin]

Jeff Garzik wrote:

> That's pretty nice.
>
> Back when I was writing [the now slated for death] 
> sound/oss/via82xxx_audio.c driver, Linus suggested that I implement 
> ->nopage() for accessing the mmap'able DMA'd audio buffers, rather 
> than using remap_pfn_range().  It worked out very nicely, because it 
> allowed the sound driver to retrieve $N pages for the mmap'able buffer 
> (passed as an s/g list to the hardware) rather than requiring a single 
> humongous buffer returned by pci_alloc_consistent().
>
> And although probably not your primary motivation, your change does 
> IMO improve this area of the kernel.


Thanks. Yeah hopefully this provides a little more flexibility (I think 
it can
already replace 3 individual vm_ops callbacks!). And I'd like to see 
what other
things it can be used for... :)

However, what we don't want is a bloating of struct fault_data IMO. So 
I'd like
to try to nail down the fields that it needs quite quickly then really 
keep a
lid on it.

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