linux-kernel - Re: [Intel IOMMU 06/10] Avoid memory allocation failures in dma map api calls

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Message-ID: <46792586.20706@linux.intel.com>
Date:	Wed, 20 Jun 2007 06:03:02 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	ak@...e.de, gregkh@...e.de, muli@...ibm.com,
	suresh.b.siddha@...el.com, ashok.raj@...el.com,
	davem@...emloft.net, clameter@....com
Subject: Re: [Intel IOMMU 06/10] Avoid memory allocation failures in dma	map
 api calls

Peter Zijlstra wrote:
> 
> 
> PF_MEMALLOC as is, is meant to salvage the VM from the typical VM
> deadlock. 

.. and this IS the typical VM deadlock.. it is your storage driver 
trying to write out a piece of memory on behalf of the VM, and calls 
the iommu to map it, which then needs a bit of memory....
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