Tuning for small system?

Is there any tuning parameters for optimizing mimalloc for small memory footprint? In e.g. tcmalloc there is page size, alignment etc. that can be tuned. Can the free list be returned to the system by an explicit call? Is allocation done with mmap or sbrk etc.

No files, tests, or entry points are named. Start by reviewing mimalloc's existing configuration and API documentation, then trace how allocation sources and free-list release are exposed; done requires a maintainer-approved scope and clear answers or documented support for the requested tuning and release behavior.

Written by the indexing model from the issue text.