Hi, I would like to attend LSF/MM to present a new file system design for non-volatile main memories. The goal of NOVA is to provide high performance and strong consistency (atomic metadata, data, mmap updates) at the same time. Although NOVA is a LFS, as it targets a different memory technology, it looks very different from conventional LFS. Some of the key design decisions of NOVA include: Per-inode log: Each inode has a log, with tail pointer points to the latest committed entry. This allows for high concurrency and parallel log scanning. Log is a linked list: Allows for fine-grained, page-size granularity garbage collection. Also, allocating log space is easy since NOVA does not need to allocate large, contiguous space for logs. Cheap atomicity: To atomically append a log, NOVA simply appends the log entry and then updates the log tail pointer. To coordinate updates across logs, NOVA appends each log and journal the log tails to update all logs atomically. This mechanism has lower overhead than journaling (which doubles writes) and shadow paging (which causes cascade updates). Stores file data outside the log: NOVA appends metadata of writes to the log and handles file data in a copy-on-write way. This results in a shorter log, and garbage collection is simple and efficient, as NOVA never copies data in log cleaning. Highly scalable: NOVA has free list, journal and inode table at each CPU to avoid global locking and scalability bottlenecks. NOVA is available on GitHub: https://github.com/NVSL/NOVA And the paper of NOVA will appear in FAST 2016. I will also give a talk in the Vault conference. I'm also interested in any NVM/DAX related topics. Thank you. Thanks, Andiry -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
