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SubjectRe: swiotlb detection should be memory hotplug aware ?
Date
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> writes:
>
>> The other problem is that using only two bits for the needed address
>> space is also extremly
>> inefficient (4GB and 16MB on x86). Really want masks everywhere and
>> optimize for the
>> actual requirements.
>
> swiotlb doesn't allocate GFP_DMA memory. It handles only GFP_DMA32.

I was lumping GFP_DMA and swiotlb together here. The
pci_alloc_consistent() function uses both interchangedly.
They really effectively are the same thing these days
and just separated by historical accident.


> I have a half-baked patch for it. I'll send it later.

The problem are still the *_map users which usually cannot sleep,
and then it's difficult to grow.
For *_alloc it's relatively easy and to some extend already
implemented.

-Andi

--
ak@linux.intel.com -- Speaking for myself only.


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