And this: Also, allocation will fail when all blocks in the fixed size block array are used, even though there might still be ample space in the heap memory re

And this: Also, allocation will fail when all blocks in the fixed size block array are used, even though there might still be ample space in the heap memory region... Basically you can fail memory allocation with a lot of small allocations that aren't using all of a block. This situation bit me when using some C++ code on a Cortex-M class processor where the C++ code ended up creating a bunch of objects with very small allocations in them. That said, the code is pretty clean and easy to read so its a pretty understandable allocator. Some malloc implementations are so opaque you have to study them for a week to tease out how they work.