Updating persistent data in persistent memory-based storage

A system-on-a-chip (SoC) comprising:

• a two-level memory comprising a first level comprising a volatile cache, and a second level comprising a persistent memory, and
• a processor, operatively coupled to the two-level memory, comprising:
• a processing core, in response to receiving a transaction begin instruction, to store a transaction identifier in a transaction identifier register prior to executing a transaction with the persistent memory and to copy the transaction identifier to a cache line of the volatile cache;
• and
• a cache controller to evict the cache line tagged with the transaction identifier from the cache to the persistent memory in response to a cache eviction event based on a commit state of the cache line.

A method comprising:

• executing, by a processing core, an application comprising instructions encoding a transaction with a persistent memory via a volatile cache, wherein the volatile cache comprises a cache line associated with the transaction, the cache line being associated with a cache line status;
• detecting a failure event occurred associated with the transaction, wherein the failure event requires a reboot of a system that the processing core supports;
• in response to determining that a status flag of the cache line indicates a committed state, evicting contents of the cache line to the persistent memory;
• and
• in response to determining that the status flag of the cache line indicates an uncommitted state, discarding the contents of the cache line.