This is one of the main issues in @dpgeorge development wishlist on the forum, yet it doesn't have an issue associated with it.

The goal is to create a defragmenting memory manager that is reasonably fast with a reasonably small memory footprint. I am currently implementing this and am in the pre-alpha stages with my tinymem memory manager. There is a forum thread detailing my development on that, so I won't use this issue to update anything but that which is directly related to work on uPython.

Task List:

• Complete Make garbage collector built on malloc / free implementation with pointer indirection #1168
• Integrate tinymem into uPython
• Validate tests
• Tweak parameters / optimize
• determine release schedule