Re: Address spaces on a i386 - Getting Confused
Richard Gooch (rgooch@atnf.csiro.au)
Tue, 30 Mar 1999 22:36:04 +1000
David Miller writes:
> Date: Tue, 30 Mar 1999 22:26:34 +1000
> From: Richard Gooch <rgooch@atnf.csiro.au>
>
> He should be able to allocate kernel pages and mmap() them to user
> space. Then he can DMA into the pages and wake up the user process
> when it's done.
>
> This would work, but only if it is mlock'd (could be done by the
> kernel, just set the appropriate vm_flags during the mmap) else the
> swapper can toss it to disk at any time.
??? Pages returned by kmalloc() or get_free_page() aren't swappable.
Regards,
Richard....
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