On Tue, Jul 05, 2011 at 09:41:48AM +0200, Marek Szyprowski wrote:

The Contiguous Memory Allocator is a set of helper functions for DMA
mapping framework that improves allocations of contiguous memory chunks.

CMA grabs memory on system boot, marks it with CMA_MIGRATE_TYPE and
gives back to the system. Kernel is allowed to allocate movable pages
within CMA's managed memory so that it can be used for example for page
cache when DMA mapping do not use it. On dma_alloc_from_contiguous()
request such pages are migrated out of CMA area to free required
contiguous block and fulfill the request. This allows to allocate large
contiguous chunks of memory at any time assuming that there is enough
free memory available in the system.

This code is heavily based on earlier works by Michal Nazarewicz.

And how are you addressing the technical concerns about aliasing of
cache attributes which I keep bringing up with this and you keep
ignoring and telling me that I'm standing in your way.