Method for providing logging for persistent memory

A memory device comprising:

• a memory controller, configured to perform operations comprising:
• receiving, from an application, an indication of a start of a logging interval corresponding to a set of one or more memory locations of the memory device;
• responsive to receiving the indication of the start of the logging interval:
• receiving a write request for a first memory location in the set of one or more memory locations of the memory device, the write request including a first value to write at the first memory location;
• responsive to the write request:
• determining that a second value was written to the first memory location in a previous logging interval and the second value has not yet been recorded to a log corresponding to the previous logging interval;
• responsive to determining that a second value was written to the first memory location in the previous logging interval and the second value has not yet been recorded to a log corresponding to the previous logging interval:
• allocating a second memory location of the memory device;
• processing the write request to write the first value into the first or the second memory location;
• storing the second value in the other of the first or second memory location;
• and
• updating metadata corresponding to the first memory location to indicate that a write operation was performed in the logging interval;
• and
• during the logging interval and while the memory device is handling memory device commands, logging values of a set of one or more modified memory locations of the memory device in a log structure, the set of one or more modified memory locations being memory locations where data changed during the previous logging interval, the set of one or more modified memory locations comprising the first memory location, the logging of the first memory location comprising saving the value stored in the first or second locations that was not used to process a write request in the logging interval.

A non-transitory machine-readable medium, storing instructions, which when executed by a memory controller of a memory device, performs operations comprising:

• receiving, from an application, an indication of a start of a logging interval corresponding to a set of one or more memory locations of the memory device;
• responsive to receiving the indication of the start of the logging interval:
• receiving a write request for a first memory location in the set of one or more memory locations of the memory device, the write request including a first value to write at the first memory location;
• responsive to the write request:
• determining that a second value was written to the first memory location in a previous logging interval and the second value has not yet been recorded to a log corresponding to the previous logging interval;
• responsive to determining that the second value was written to the first memory location in the previous logging interval and the second value has not yet been recorded to a log corresponding to the previous logging interval:
• allocating a second memory location of the memory device;
• processing the write request to write the first value into the first or the second memory location;
• storing the second value in the other of the first or second memory location;
• and
• updating metadata corresponding to the first memory location to indicate that a write operation was performed in the logging interval;
• and
• during the logging interval and while the memory device is handling memory device commands, logging values of a set of one or more modified memory locations of the memory device in a log structure, the set of one or more modified memory locations being memory locations where data changed during the previous logging interval, the set of one or more modified memory locations comprising the first memory location, the logging of the first memory location comprising saving the value stored in the first or second locations that was not used to process a write request in the logging interval.