On Mon, 29 Jan 2007, Andrew Morton wrote:
> > All 64 bit machine will only have a single zone if we have such a range
> > alloc mechanism. The 32bit ones with HIGHMEM wont be able to avoid it,
> > true. But all arches that do not need gymnastics to access their memory
> > will be able run with a single zone.
>
> What is "such a range alloc mechanism"?
As I mentioned above: A function that allows an allocation to specify
which physical memory ranges are permitted.
> So please stop telling me what a wonderful world it is to not have multiple
> zones. It just isn't going to happen for a long long time. The
> multiple-zone kernel is the case we need to care about most by a very large
> margin indeed. Single-zone is an infinitesimal corner-case.
We can still reduce the number of zones for those that require highmem to
two which may allows us to avoid ZONE_DMA/DMA32 issues and allow dma
devices to avoid bunce buffers that can do I/O to memory ranges not
compatible with the current boundaries of DMA/DMA32. And I am also
repeating myself.
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