Re: [Linaro-mm-sig] [PATCH 08/10] mm: cma: Contiguous MemoryAllocator added

[Michal Nazarewicz]

On Wed, 22 Jun 2011 15:39:23 +0200, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> Why that? I would expect you can do the same that hugepages (used to) do
> and just attempt high-order allocations. If they succeed, you can add  
> them as a CMA region and free them again, into the movable set of pages,  
> otherwise you just fail the  request from user space when the memory is
> already fragmented.

Problem with that is that CMA needs to have whole pageblocks allocated
and buddy can allocate at most half a pageblock.

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