We'd like to be able to tell how many allocations and deallocations took place in a given period of time (say a frame workload) and also generate histograms of the allocations along with an estimate of how long each allocation survived. Some requirements:

• Allow turning off this instrumentation in release modes.
  • Perhaps wrap existing allocators in a new impeller::InstrumentedAllocator but only in non-release modes.
• Allow dumping information on allocations to the timeline.
• Allow tracking how long each allocation survived.
  • If there are multiple short lived allocations, we could be doing something better.
  • Perhaps via delegation in the new impeller::InstrumentedAllocator.
• Allow additional debug information to be attached to allocations.