Warn if a/mperf is not configured

[vext01]

Warn the user if they didn't set up a/mperf ratio tolerances.

[ltratt]

IIRC, we check the "did this processor clock down" bit and rerun based on that? If so, do we even need the tolerances any more?

[ltratt]

@vext01 Ping.

[vext01]

From c7210108:

Changes in throttle flags now cause a re-run.

Reading the diff, the throttle counts are checked on Linux unconditionally.

They are read from a sysfs node.

So we could in fact close this, possibly removing a/mperf from Krun and the custom kernel at some point?

[ltratt]

So we could in fact close this, possibly removing a/mperf from Krun and the custom kernel at some point?

I think so too.