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

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Message-ID: <20070608224539.GA9851@linux-os.sc.intel.com>
Date:	Fri, 8 Jun 2007 15:45:40 -0700
From:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
To:	Christoph Lameter <clameter@....com>
Cc:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	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, Jun 08, 2007 at 03:32:08PM -0700, Christoph Lameter wrote:
> On Fri, 8 Jun 2007, Keshavamurthy, Anil S wrote:
> 
> > In the IOMMU case, we need exactly opposite of what mempool provides,
> > i.e we always want to look for the element in the pool and if the pool
> > has no element then go to OS as a worst case. This resource pool
> > library routines do the same. Again, this resource pools 
> > grows and shrinks automatically to maintain the minimum pool 
> > elements in the background. I am not sure whether this totally
> > opposite functionality of mempools and resource pools can be 
> > merged.
> 
> 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 :)
I want to be able to reserve certain amount of memory specifically for 
IOMMU purpose.

-Anil
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