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

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Date:	Mon, 11 Jun 2007 14:40:04 -0700
From:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
To:	Christoph Lameter <clameter@....com>
Cc:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	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, Jun 11, 2007 at 02:29:56PM -0700, Christoph Lameter wrote:
> 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.

Okay, will do this change and get back to the list.


> > 
> > 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?
Not sure. Also most of the callers today don;t check for failures.

-Anil
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