[$] Thread-identity switcheroo for io_uring

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The io_uring

subsystem is all about asynchronous execution; applications count on it

to not block — unless explicitly requested to. Within io_uring, maintaining

the "never blocks" guarantee has sometimes been a challenge, given that

many paths in the kernel were never designed for asynchronous execution.

This problem has been worked around, but at a significant cost to

performance. Now, io_uring maintainer Jens Axboe has posted an RFC patch set

with a somewhat radical (and potentially scary) solution to the problem.

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