With v4.15 of the Linux kernel the Filesystem-DAX implementation has reached a level of functionality that satisfies a wide range of persistent memory applications, but there is more work to do. This "What's Next for Filesystem-DAX" session will discuss gaps and next steps in this space. Potential topics include:RDMA interfaces for long term memory registrationDAX implications for filesystem metadata managementError handling, i.e. going beyond "bad blocks" lists at the block device layer, and stray write protectionPerformance topics, for example what to do about cases where persistent memory could benefit from DRAM page cache.Gigantic page support, can current Linux filesystems support 1GB page mappings.