Last time I read about it is here: http://lwn.net/Articles/576691/
> but it's not clear to me how the CPU-yielding would work in the async case.
It wouldn't, otherwise it's not async.. That said, if you fill the buffer an async IPC "degenerate to synchronous" (if you see what I mean), so it could still be interesting to yield the CPU if/when this happen.
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