Messages in this thread | | | Date | Thu, 8 Nov 2018 23:45:10 -0800 | From | Christoph Hellwig <> | Subject | Re: [PATCH] iommu/dma: Zero pages manually in a length of scatterlist |
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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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