Re: [PATCH v5 3/3] perf stat: Add no-affinity flag

[Andi Kleen]

> Ack. This is only adding the flag to perf stat, are the storms as much
> of an issue there? Patch 2 of 3 changes it so that for a single event
> we still use affinities, where a dummy and an event count as >1 event.

Not sure I follow here. I thought you disabled it completely?

> We have specific examples of loaded machines where the scheduling
> latency causes broken metrics - the flag at least allows investigation
> of issues like this. I don't mind reviewing a patch adding real time
> priorities as an option.

You don't need a new flag. Just run perf with real time priority with
any standard wrapper tool, like chrt. The main obstacle is that you may
need the capability to do that though.

-Andi