Re: [Intel IOMMU 06/10] Avoid memory allocation failures in dma mapapi calls

[Arjan van de Ven]

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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