[SPDK] Regarding collection of iostat information for application with SPDK driver.

[Sreeni (Sreenivasa) Busam (Stellus) <s.busam at stellus.com>]

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Hello,

I am working on a tool to collect IO statistics like

1.      Read IOPS

2.      Write IOPS
and other metrics on a per process basis for SSD device and given namespace. The assumption is all the Read and Write I/O statistics and latency should be collected for a given process which may do I/O on one or more NVMe SSD devices based on a configuration file.
I am going through the lib/bdev code and trying to see where I can add the code to collect the statistics. I have spent only a few days looking into the SPDK code and new to the code.
Is this the right function, spdk_bdev_io_complete() for me to start looking into?
Please give any suggestions you have or what are the functions I should look into? Where should I investigate more to collect the I/O statistics?
I appreciate your ideas and any help in this regard.

Thanks a lot,
Sreeni

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