Open Source Summit North America 2025: Full Schedule

June 23 - 25, 2025
Denver, Colorado
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Note: The schedule is subject to change.

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IMPORTANT NOTE: Timing of sessions and room locations are subject to change.

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11:20am MDT

Securing File Integrity Without Performance Overhead - V Sreenivas, Stackup

Monday June 23, 2025 11:20am - 12:00pm MDT

Bluebird Ballroom 2E

Maintaining system integrity requires making sure that only permitted files are run. By calculating and comparing file digests, conventional techniques like the Integrity Measurement Architecture (IMA) confirm the integrity of files. Unfortunately, these methods lack flexibility in policy modifications and frequently result in performance bottlenecks from repetitive disk reads. An eBPF-based method that improves file integrity verification without requiring modifications to current data formats is shown in this session. This eBPF solution functions as a stand-alone element, in contrast to earlier suggestions like IMA Digest Lists, which rely on static configurations. It enables dynamic policy modifications based on real-time observations by giving other security modules on-demand reference digest values. Through techniques like eBPF, this system may be expanded with additional parsers and comes with parsers for a variety of data formats. In order to guarantee that cryptographic keys are only used when accessed files have known digests, it can function during the early startup stages and provide deterministic reading of data sources.

Speakers

Vutukuri Sreenivas

Community Evangalist, Stackup

Vutukuri Sreenivas is a tech enthusiast buzzing with excitement about how innovation shapes our world. A final-year B.Tech student at Presidency University, Bangalore, he’s diving into DevOps and cloud-native tech, exploring tools like Kubernetes. Sreenivas mentors coders at Google... Read More →

Monday June 23, 2025 11:20am - 12:00pm MDT
Bluebird Ballroom 2E

Linux

2:25pm MDT

Make Valkey Multi-threaded With Userspace RCU - Jim Huang, National Cheng Kung University

Monday June 23, 2025 2:25pm - 3:05pm MDT

Bluebird Ballroom 2E

This presentation explores how to create a multi-threaded version of Valkey by employing userspace Read-Copy-Update (RCU) to achieve high performance. With fewer than 2,000 lines of code modifications, we introduce a coordinator-worker pattern, enabling key-value stores like Valkey and Redis to handle tasks concurrently across multiple threads while using a per-thread event loop for I/O operations. Userspace RCU facilitates lock-free data sharing between a writer thread and multiple reader threads, dramatically improving read performance.

Our experiments show that the multi-threaded Valkey can achieve over one million operations per second on a standard server.

Speakers

Jim Huang

Assistant Professor, National Cheng Kung University

Drawing from his contributions to the Android Open Source Project (AOSP), Jim specializes in real-time performance tuning and optimization of Linux-based automations. Additionally, he is a co-founder of the LXDE project, a lightweight desktop environment widely utilized in embedded... Read More →

Monday June 23, 2025 2:25pm - 3:05pm MDT
Bluebird Ballroom 2E

Linux

Audience Experience Level Beginner

3:35pm MDT

State Persistence Over kexec - Mike Rapoport, Microsoft

Monday June 23, 2025 3:35pm - 4:15pm MDT

Bluebird Ballroom 2E

For long time kexec was a faster way to reboot a machine without incurring delays caused by firmware and bootloaders. However for many applications even a kexec reboot still means significant service degradation, like disruption of the running guests in virtualized environments and the need to rebuild in-memory caches for large databases.

We propose Kexec HandOver (KHO) mechanism that allows serialization and deserialization of kernel data as well as preserving arbitrary memory ranges across kexec.

In addition, KHO keeps physically contiguous memory regions that are guaranteed to not have any memory that KHO would preserve, but still can be used by the system. The kexeced kernel bootstraps itself using those regions and marks all handed over memory as in use. KHO users then can recover their state from the preserved data. This includes memory reservations, where the user can either discard or claim reservations.

Speakers

Mike Rapoport

Principal Software Engineer, Microsoft

Mike has lots of programming experience in different areas ranging from medical equipment to visual simulation, but most of all he likes hacking on Linux kernel and low level stuff. He started contributing to the Linux kernel while working on ARM and device drivers and then gradually... Read More →

Monday June 23, 2025 3:35pm - 4:15pm MDT
Bluebird Ballroom 2E

Linux

Audience Experience Level Advanced

4:30pm MDT

A Deep Dive Into eBPF Program Loader - Cong Wang, Independent

Monday June 23, 2025 4:30pm - 5:10pm MDT

Bluebird Ballroom 2E

As eBPF continues to revolutionize Linux observability and networking, the complexity of its program loading mechanism has evolved significantly.

This technical deep dive unravels the sophisticated machinery behind eBPF program loading, exploring the intricate interplay between userspace loader and Linux kernel verifier. We'll dissect the eBPF program relocation mechanisms, examine the role of BTF (BPF Type Format) in enabling strong typing and verification capabilities, and analyze the complex choreography of bpf() syscalls that bridge userspace and kernel operations. Finally, we will also discuss the security implications and program signing challenges in the loading pipeline.

Speakers

Cong Wang

Linux Kernel Engineer, Self Employed

Cong Wang is a professional Linux kernel developer mainly focuses on networking and eBPF, he is also a Linux kernel maintainer for the networking traffic control subsystem. He has contributed over 1000 patches to Linux kernel.

Monday June 23, 2025 4:30pm - 5:10pm MDT
Bluebird Ballroom 2E

Linux

Audience Experience Level Intermediate