Transaction management using metadata

An apparatus, comprising:

• a volatile memory;
• a non-volatile memory;
• and
• an interface controller coupled with the volatile memory and the non-volatile memory, wherein the interface controller is operable to:
• receive a read command for a memory address of the non-volatile memory, the memory address indicating a set of non-volatile memory cells in the non-volatile memory;
• determine, based at least in part on the read command, whether first data stored in the set of non-volatile memory cells is also stored in a set of volatile memory cells in the volatile memory;
• and
• transmit, based at least in part on determining that the first data is not stored in the set of volatile memory cells, second data along with an indicator that indicates whether the second data was requested.

A non-transitory computer-readable medium storing code comprising instructions, which when executed by a processor of an electronic device, cause the electronic device to:

• receive, from a host device, a read command for a first set of data, the read command associated with a latency for returning the first set of data to the host device;
• determine, in response to receiving the read command, that the first set of data is stored in a non-volatile memory and not a volatile memory;
• and
• transmit, to the host device, a second set of data according to the latency for returning the first set of data and a signal that indicates whether the second set of data was requested by the host device.