Adjustable buffer memory space

A method comprising:

• determining, by a memory controller of a memory sub-system, whether an adjustable buffer memory space feature is enabled on the memory sub-system, the memory sub-system comprises a first set of memory devices and a second set of memory devices, the second set of memory devices comprising allocated storage space, the allocated storage space for storing logical-to-physical memory address mapping data that maps a logical memory address of a namespace to a physical memory address corresponding to a data storage location on the first set of memory devices;
• and
• based on determining that the adjustable buffer memory space feature is enabled:
• determining, by the memory controller, a set of overprovision storage spaces in the allocated storage space, the set of overprovision storage spaces being assigned to a set of current namespaces, a overprovision storage space of a current namespace being associated with storage of logical-to-physical memory address mapping data that maps a set of logical memory addresses of the current namespace to a set of physical memory addresses corresponding to a set of data storage locations on the first set of memory device, and the set of data storage locations being reserved on the memory sub-system as overprovisioned;
• determining unallocated storage space on the second set of memory devices;
• and
• enabling, for a host system coupled to the memory sub-system, access to buffer memory space on the second set of memory devices, the buffer memory space comprising a portion of the unallocated storage space and a portion of the set of overprovision storage spaces.

A non-transitory computer-readable storage medium comprising instructions that, when executed by a processing device, cause the processing device to perform operations comprising:

• receiving, from a host system, a request to reduce a data size of logical-to-physical memory address mapping data, the logical-to-physical memory address mapping data comprising a set of entries that each map a logical memory address of a namespace to a physical memory address corresponding to a data unit stored on a first set of memory devices of a memory sub-system, the data unit having a data unit size, the logical-to-physical memory address mapping data being stored on a second set of memory devices of a memory sub-system;
• and
• in response to the request:
• updating the data unit size from a first value to a second value, the second value being larger than the first value;
• generating a reduced-size logical-to-physical memory address mapping data based on the updated data unit size, the reduced-size logical-to-physical memory address mapping data being stored on the second set of memory devices;
• determining unallocated storage space on the second set of memory devices based on the reduced-size logical-to-physical memory address mapping data;
• and
• enabling, for the host system, access to buffer memory space on the second set of memory devices, the buffer memory space comprising a portion of the unallocated storage space.