hesela.devMAP_SYNC
MAP_SYNC is a Linux mmap flag for supported DAX files that provides a file-offset persistence guarantee used with appropriate CPU persistence instructions.
The flag must be requested with MAP_SHARED_VALIDATE: MAP_SHARED can silently ignore it, and files without support fail with EOPNOTSUPP. It does not itself issue a persistence operation for every store. [1] The application still needs a correct durability and recovery protocol; a mapping contract is not multi-write atomicity. [2]
Relations
- related
- dax, persistent-memory, persistence-ordering, crash-consistency