I'm looking for a way to write a memory allocator that will bucket allocations based on what system is using that memory (ie: have a bucket for UI, Animation, Gameplay, etc).

But the kicker is that I can't modify the call sites of any allocation, and the current allocator interface only asks for an alloc size and alignment.

I've had someone suggest manually walking the stack to figure out what's making the alloc call... are there any other options?