Messages in this thread | | | Date | Wed, 20 Jun 2007 12:14:57 -0700 | From | Arjan van de Ven <> | Subject | Re: [Intel IOMMU 06/10] Avoid memory allocation failures in dma map api calls |
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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..... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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