On Thu, Aug 1, 2019 at 2:59 PM Peter Zijlstra [off-list ref] wrote:

On Thu, Aug 01, 2019 at 11:28:30AM -0700, Suren Baghdasaryan wrote:

quoted

quoted

By marking it FIFO-99 you're in effect saying that your stupid
statistics gathering is more important than your life. It will preempt
the task that's in control of the band-saw emergency break, it will
preempt the task that's adjusting the electromagnetic field containing
this plasma flow.

That's insane.

IMHO an opt-in feature stops being "stupid" as soon as the user opted
in to use it, therefore explicitly indicating interest in it. However
I assume you are using "stupid" here to indicate that it's "less
important" rather than it's "useless".

Quite; PSI does have its uses. RT just isn't one of them.

Sorry about messing it up in the first place.
If you don't see any issues with my patch replacing
sched_setscheduler() with sched_setscheduler_nocheck(), would you mind
taking it too? I applied it over your patch onto Linus' ToT with no
merge conflicts.
Thanks,
Suren.

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