Re: [PATCH V7 07/14] perf/core: Add a new PERF_EV_CAP_COEXIST event capability

From: Andi Kleen
Date: Fri Jul 24 2020 - 10:46:34 EST

> Something that seems to 'work' is:
> '{cycles,cpu/instructions,period=50000/}', so maybe you can make the
> group modifier :S use any sampling event if there is one, and otherwise
> designate the leader.
> Then you can write things like:
> '{slots, metric1, metric2, cpu/cycles,freq=50000/}:S'
> and then since cycles is specified as a sampling event, it will use
> that.

Okay possible, but it makes things more complicated
for the user to understand and requires special documentation.
Hopefully it's worth it the internal simplification.