erlang/otp — pull request #290 by Etsukata (2014-03-10 14:23:18+00:00)
Title: dtrace: shows queue length on aio_pool-add/get

Current aio_pool-add/get always shows queue length == -1 and
there are TODO comments "Get the queue length" in async_add/get.
This patch shows queue length on aio_pool-add/get by counting
queue length of ErtsAsyncQ.