On Wed, Aug 28, 2024 at 03:07:14PM +0100, James Clark wrote:

I rebased this one and made some other fixes so that I could test it,
so I thought I'd repost it here in case it's helpful. I also added a
new test.

But for the testing it all looks ok.

There is one small difference where it now hides _all_ <not supported>
events, when previously it would only hide some selected subset of
events like "stalled-cycles-frontend". I think this is now more
consistent across platforms because, for example, Apple M only has
cycles and instructions, and the rest of the default events would
always show as <not supported> there.

I'm not a big fan of hiding all of <unsupported>, when they are explicitly 
specified on the command line they should be absolutely shown.

I do have tools that specify events on the command line and expect
the same order/events in the output. This might well cause breakage.

-Andi