Re: PATCH: Raw device IO for 2.1.131

H. Peter Anvin (hpa@transmeta.com)
13 Dec 1998 23:55:40 GMT

Followup to: <m0zpHh0-0007U1C@the-village.bc.nu>
By author: alan@lxorguk.ukuu.org.uk (Alan Cox)
In newsgroup: linux.dev.kernel
>
> > I think it's perfectly correct in this case to use mlock(), but the goal
> > is not to pin down pages as a basic mechanizm, but to guarantee bandwith.
> > (i assume the capture card can do at least page granularity scatter-gather
> > DMA?)
>
> Yes. It can do that page level.
>
> > (since it's video-capture, mlock() should not be much of an issue, the
> > card is a controlled resource anyway. If in the future we will have video
>
> His torvaldsness rejected a patch that made mlock callable from inside drivers
> to do this sort of stuff. So thats not a possibility.
>

Hang on... this sounds like exactly the kind of stuff that we want,
but want in 2.3. I'd say we need 2.2 out ASAP more than anything
else at this point.

-hpa

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