Systemtap seems nice, but it doesn't have the post-processing / visualization for the whole system like LTT does. I see it more like a tool to do more specific analysis tools.
I see what you mean. systemtap people are working on some GUI data graphing tools, but are just starting. (I got the impression though that LTTV was being deprecated in favour of eclipse-based widgets, which systemtap and other tools could feed data into also.)
However, for this kind of stuff it's a bit too complicated (e.g. in embedded environments where you don't want to run stap / compile the scripts on the device itself etc)
We hope to ease that pain by more automated cross-compilation/execution.
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