Re: swiotlb detection should be memory hotplug aware ?

[Andi Kleen]

FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx -- Speaking for myself only.
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