Re: [PATCH v1] perf top: Merge hybrid common events

> So I think we can add a json field to indicate mergeability and set it
> on legacy instructions, perhaps things like branches and
> branch-misses

But the current simple check already works fine for them? 

>. We can also detect a hybrid system and switch from
> cycles to instructions as the default event when merging is desired
> (like in perf top).

instructions rarely gives you an accurate breakdown because
the IPC varies so much in practice. cycles is a much 
better default.

The other things are reasonable I guess, but all not really
needed initially.

-Andi