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authorChristoph Hellwig <hch@lst.de>2011-08-25 08:26:01 +0200
committerKevin Wolf <kwolf@redhat.com>2011-08-25 18:18:42 +0200
commita597e79ce14ea62266924acc7b8a7030a42ed29b (patch)
tree2dfae8672b7a3b85d3fa5e138c2ffe361e97cf29 /iov.h
parent2f4b7593674e986e60b0b0f1a46707e0e149eb6d (diff)
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block: explicit I/O accounting
Decouple the I/O accounting from bdrv_aio_readv/writev/flush and make the hardware models call directly into the accounting helpers. This means: - we do not count internal requests from image formats in addition to guest originating I/O - we do not double count I/O ops if the device model handles it chunk wise - we only account I/O once it actuall is done - can extent I/O accounting to synchronous or coroutine I/O easily - implement I/O latency tracking easily (see the next patch) I've conveted the existing device model callers to the new model, device models that are using synchronous I/O and weren't accounted before haven't been updated yet. Also scsi hasn't been converted to the end-to-end accounting as I want to defer that after the pending scsi layer overhaul. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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