trace: Trace bdrv_aio_{readv,writev}
Observing block layer aio readv/writev operations is useful for debugging image formats or understanding guest disk I/O patterns. Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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