Actually if you look at the timeline window, there a another timeline belong (you might need to grow the window in height).
If you're using this branch : https://github.com/djdeath/linux/tree/wip/djdeath/oa-next
GPUTop will be able to merge to 2 timelines into one.
Unfortunately this isn't upstream yet, the patches need a bit more work.

Timeline where each individual trace point event is shown as a horizontal line (similar to other tracing GUIs), is useful when one is investigating latency issues (i.e. very short time intervals), but I was thinking more about X/Y timelines like the "Global" & "Per context" ones.

One where Y-value is either:

• The value given by the event (e.g. frequency requested from GPU by kernel), or
• Number of events during the selected period

For latter, I would use the visible OA sampling period as that would help #188.

Maybe these would actually be better to be handled as special "tracepoint counters", along the lines of what I described in #188?

Currently I have only 2 tracepoints I care to track this way, user space buffer swaps, and kernel GPU freq request. I already have ticket for the first, I can add another one for the second one.