RE: Ideas for adding physically contiguous memory support to mmap ()??

["Benjamin C.R. LaHaise" <blah@kvack.org>]

On Tue, 10 Apr 2001, LUTZ,TODD (HP-Boise,ex1) wrote:

> The short answer...
> 
> I have an embedded application that wants to manage most of memory in the
> system and wants it to be shared between processes.  The application starts,
> determines the amount of free memory, leaves a little for the OS, then
> allocates the rest as shared memory.  It needs to be physically contiguous
> because not all of our DMAs support scatter-gather.

Stop building broken hardware -- seriously!  But if you must, just use the
bigmem patches to reserve a chunk of memory and then mmap it via /dev/mem
(or even boot with a mem= map that leaves memory unused).  That doesn't
require any kernel changes and is much faster to implement. 

		-ben

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