Btrfs is being deployed in more and more production systems, and as a result it has matured in stability and performance. In particular, Facebook's production systems push Btrfs especially hard, which has uncovered some unanticipated scalability bottlenecks. In this presentation, Omar Sandoval will discuss the shortcomings of the original Btrfs free space cache and explain the design of its replacement, the free space tree, which is Btrfs' latest solution to the classic filesystem problem of tracking unallocated space.
Omar Sandoval is employed by Facebook where he works on the Linux kernel team. He has made numerous contributions to Btrfs, the most notable being the free space tree.
