Hi Mikulas,
> The decision whether bio is counted or not is made by the code that
> submits the bio. This leads to some problems:
How about convering dm targets to use generic_make_request?
Since submit_bio counts vm events, it seems natural for
caller to decide which function to use.
Device driver does not know whether the requested I/O is
for vm-to-device or device-to-device.
We could still use iostat to measure throughput of individual
block devices.
Thanks,
--
Jun'ichi Nomura, NEC Corporation
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