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

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Message-ID: <Pine.LNX.4.64.0706111428410.20454@schroedinger.engr.sgi.com>
Date:	Mon, 11 Jun 2007 14:29:56 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
cc:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, gregkh@...e.de, muli@...ibm.com,
	asit.k.mallick@...el.com, suresh.b.siddha@...el.com,
	arjan@...ux.intel.com, ashok.raj@...el.com, shaohua.li@...el.com,
	davem@...emloft.net
Subject: Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling

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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