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SubjectRe: [Intel IOMMU 06/10] Avoid memory allocation failures in dma map api calls
Peter Zijlstra wrote:
> So a reclaim context (kswapd and direct reclaim) set PF_MEMALLOC to
> ensure they themselves will not block on a memory allocation. And it is
> understood that these code paths have a bounded memory footprint.


that's a too simplistic view though; what happens is that kswapd will
queue the IO, but the irq context will then take the IO from the queue
and do the DMA mapping... which needs the memory.....
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