Messages in this thread |  | | Date | Wed, 21 Aug 2002 06:31:04 +0200 | From | Mike Galbraith <> | Subject | RE: Alloc and lock down large amounts of memory |
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At 03:08 PM 8/20/2002 -0500, Bhavana Nagendra wrote: > > > > Curiosity: why do you want to do device DMA buffer > > allocation from userland? > >I need 256M memory for a graphics operation. It's a requiremment, >can't change it. There will be other reasonably sized allocs in kernel >space, this is a special case that will be done from userland. As >discussed earlier in this thread, there's no good way of alloc()ing >and pinning that much in DMA memory space, is there?
Not that I know of. It seems to me that any interface that tried to provide this would have to know what kind of device is going to DMA from/to that ram.
Usually, when someone needs a large gob of contiguous ram, folks suggest doing the allocation in kernel, and early.
-Mike
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