Gerd Hoffmann wrote:
  Hi,

BTW, if everyone thinks it could be a good idea I can port block-raw.c
to use linux kernel AIO (without removing POSIX AIO support, of course)

IMHO it would be a much better idea to kill the aio interface altogether
and instead make the block drivers reentrant.  Then you can use
(multiple) posix threads to run the I/O async if you want.

Threads are a poor substitute for a proper AIO interface. linux-aio gives you everything you could possibly want in an interface since it allows you to submit multiple vectored operations in a single syscall, use an fd to signal request completion, complete multiple requests in a single syscall, and inject barriers via fdsync.

Regards,

Anthony Liguori

cheers,
  Gerd








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