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

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Date:	Fri, 8 Jun 2007 15:55:05 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, ak@...e.de, 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 Fri, 8 Jun 2007, Keshavamurthy, Anil S wrote:

> > What functionality are you missing in the page allocator? It seems that is 
> > does what you want?
> Humm..I basically want to allocate memory during interrupt context and 
> expect not to fail. I know this is a hard requirement :)

The page allocator can do that for you. The reserves are configurable. Not 
failing is a thing unseen in the computer world.

> I want to be able to reserve certain amount of memory specifically for 
> IOMMU purpose.

That is of course a problem unless you allocate memory beforehand. 
Mempool?



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