On 10/02/2009 10:19 PM, Gregory Haskins wrote:
We want to add a more efficient way to get PIO signals out of the guest, so we add an "xioevent" interface. This allows a client to register for notifications when a specific MMIO/PIO address is touched by the guest. This is an alternative interface to ioeventfd, which is performance limited by io-bus scaling and eventfd wait-queue based notification mechanism. This also has the advantage of retaining the full PIO data payload and passing it to the recipient.
Can you detail the problems with io-bus scaling and eventfd wait-queues? Maybe we should fix these instead.
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