for the activity data like number of allocations, having a timeline visualization would be awesome. I imagine it to look similar to this:

http://doc.qt.io/qtcreator/images/qtcreator-qml-performance-monitor.png

I.e. a histogram over time where lots of activity also gets color-encoded into the resulting blocks. This may also be good for inspiration:

http://www.zerohedge.com/sites/default/files/images/user5/imageroot/von%20havenstein/Inflation%20heatmapt_0.jpg

Also note worthy: http://www.qnx.de/developers/docs/6.5.0/index.jsp?topic=%2Fcom.qnx.doc.ide.userguide%2Ftopic%2Fsysprof_SysProf_TimelineView_.html