Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling

[Christoph Lameter]

On Mon, 11 Jun 2007, Keshavamurthy, Anil S wrote:

> Hence, can I assume that the conclusion of this 
> discussion is to use kmem_cache_alloc() functions 
> to allocate memory in dma_map_{single|sg} API's?


Use the page allocator for page size allocations. If you need to have 
specially aligned memory in less than page sized chunks then use 
kmem_cache_alloc with a specially configured slab.
> 
> Again, if dma_map_{single|sg} API's fails due to 
> failure to allocate memory, the only thing that can
> be done is to panic as this is what few of the other 
> IOMMU implementation is doing today. 

Why does it have to be so severe? The I/O operation fails right?

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