umm-malloc-rs

Provides a global allocator using the umm_malloc library.

umm_malloc is a small and simple memory allocator designed for embedded systems. It is able to allocate and free quickly with limited memory fragmentation.

Limitations

All allocations from this allocator are aligned by 8 bytes. Requesting a larger alignment is not implemented and will panic.

Features

• sync Enables critical sections around the allocator internals, which must be implemented with the external functions _umm_critical_entry() and _umm_critical_exit().

• cortex-m When combined with sync, provides an implementation of critical sections by disabling interrupts.

• first-fit Use the first available block for allocation, rather than search for a better fit.

Future Work

umm_malloc has features for collecting metrics and detecting heap corruption, which could be exposed conveniently with cargo features.

An implementation of memalign could be added to umm_malloc.