lisa.wlgen.fio: Introduce Fio as Workload

[cloehle]

Fio is a highly-configurable I/O tester used by the block layer for testing and as a general benchmark tool for storage. Even for scheduler investigations Fio is interesting as in_iowait-setting tasks are treated differently. To be able to create tests for them we introduce a simplistic lisa frontend.

Fio Workloads can now be created like:

ftest = Fio(target, filename="/dev/nvme0n1", name="test", rw="randread", runtime=50, bs='4k') and then ran like any other:

with ftest:
result = fiotestmmc.run()
print(result.read_iops)

[cloehle]

Just a couple of notes:
Fio has the capability to specify jobs using a file, I didn't implement this and just used command line.
If this is preferred I can do that, I was also thinking about the possibility of combining a RTA workload and a Fio one, which I wouldn't say is too far fetched.

The work is really for investigating schedutil / intel_pstate iowait_boost behavior but of course the entire I/O workload w.r.t. scheduling events and their analysis could prove useful for other use cases like io_uring workloads more generally.

[douglas-raillard-arm]

Closing as the project has moved to https://gitlab.arm.com/tooling/lisa/