We present ghOSt, our infrastructure for delegating kernel scheduling decisions to
userspace code. ghOSt is designed to support the rapidly evolving needs of our data center …

We present uFS, a user-level filesystem semi-microkernel. uFS takes advantage of a high-
performance storage development kit to realize a fully-functional, crash-consistent, highly …

The overhead of the kernel storage path accounts for half of the access latency for new
NVMe storage devices. We explore using BPF to reduce this overhead, by injecting user …

High development velocity is critical for modern systems. This is especially true for Linux file
systems which are seeing increased pressure from new storage devices and new demands …

Multiplexing software threads onto hardware threads and serving interrupts, VM-exits, and
system calls require frequent context switches, causing high overheads and significant …

We present FusionFS, a direct-access firmware-level in-storage filesystem that exploits the
near-storage computational capability for fast I/O and data processing, consequently …

Traditionally, I/O systems have been developed within the confines of a centralized OS
kernel. This led to monolithic and rigid storage systems that are limited by low development …

With the ever-increasing amount of data generate in the world, estimated to reach over 200
Zettabytes by 2025, pressure on efficient data storage systems is intensifying. The shift from …

We present LibrettOS, an OS design that fuses two paradigms to simultaneously address
issues of isolation, performance, compatibility, failure recoverability, and run-time upgrades …

Implementing the filesystem in user space reduces development complexity and decreases
dependency on the underlying OS platform. Implementing the filesystem at the user level as …