On 03/17/2010 06:58 PM, Christoph Hellwig wrote:
On Wed, Mar 17, 2010 at 06:53:34PM +0200, Avi Kivity wrote:
Meanwhile I looked at the code, and it looks bad. There is an
IO_CMD_FDSYNC, but it isn't tagged, so we have to drain the queue before
issuing it. In any case, qemu doesn't use it as far as I could tell,
and even if it did, device-matter doesn't implement the needed
->aio_fsync() operation.
No one implements it, and all surrounding code is dead wood. It would
require us to do asynchronous pagecache operations, which involve
major surgery of the VM code. Patches to do this were rejected multiple
times.
Pity. What about the O_DIRECT aio case? It's ridiculous that you can
submit async write requests but have to wait synchronously for them to
actually hit the disk if you have a write cache.
--
error compiling committee.c: too many arguments to function
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