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

From: Christoph Lameter
Date: Mon Jun 11 2007 - 17:30:14 EST

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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