On Wed, Mar 03, 2021 at 01:27:34PM +0800, Lu Baolu wrote:

I have tested this framework with the Intel VT-d implementation. It
works as expected. Hence,

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Lu Baolu <baolu.lu@linux.intel.com>

Thanks!

One possible future optimization is that we could allow the system
administrators to choose between handle PRQs in a workqueue or handle
them synchronously. One research discovered that most of the software
latency of handling a single page fault exists in the schedule part.
Hence, synchronous processing will get shorter software latency if PRQs
are rare and limited.

Yes, the risk is that processing a fault synchronously will take too much
time, leading to PRI queue overflow if the IOMMU keeps receiving page
faults. That's why I opted for the workqueue initially, but it's
definitely something we can tweak

Thanks,
Jean

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