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SubjectRe: [PATCH] iommu/dma: Zero pages manually in a length of scatterlist
On Tue, Nov 06, 2018 at 02:39:26PM +0000, Robin Murphy wrote:
> ...and I have some significant objections to that simplification which I
> plan to respond with ;)
>
> (namely that it defaults the whole higher-order page allocation business
> which will have varying degrees of performance impact on certain cases)

Well, please place your objection there. The behavior does match what
every other iommu-based dma ops implementation ouside of arm/arm64 does,
so there is some precedent for it to say the least. But if the only
current users objects I'll surely find a way to accomodate it, but a
good rationale including numbers would be useful to document it.

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