Linux Plumbers Conference 2020

Session

Real-time MC

Aug 24, 2020, 7:00 AM

Presentation materials

4a6da23a.pdf

4a6da23a.txt

242. Welcome

8/24/20, 7:00 AM

Welcome to the Real-time Microconference.

109. A Realtime Tour Through BPF

Paul McKenney (Facebook)

8/24/20, 7:05 AM

Injecting large quantities of preempt-disabled code pretty much anywhere in a realtime Linux kernel at runtime. What is not to like?

This discussion will open with a review of recent changes to BPF, including the new ability for at least some BPF programs to be preemptible. It will continue with an overview of BPF use cases, which is hoped to set the stage for a discussion on how realtime...

63. futex2: A New Interface

André Almeida (Collabora)

8/24/20, 7:30 AM

After a renewed interest in futex from several groups who are trying to extend the interface (i.e. futex wait multiple, futex swap, variable-sized futexes), alongside failed attempts to solve longstanding issues that cannot be solved under the current interface, Thomas Gleixner is convinced a new implementation of futex is necessary. This topic will collect feedback on the work being done to...

116. How do we kick our RT habit?

Dhaval Giani (Oracle), Prakash Sangappa (Oracle)

8/24/20, 7:55 AM

Inside our large database application setup, we have a few critical processes. Some of the functions include, heartbeat (for the cluster), monitoring what was happening (to debug in case a cluster does go down) amongst others.

Elaborating on a single example, if the heartbeat process doesn't run when it should, the cluster could remove the node, and then the node would have to shutdown,...

59. Handling stable releases once RT is merged

Mark Brown

8/24/20, 8:35 AM

Currently RT developers maintain a series of RT releases based off various stable versions which add the RT patches on top. Once the RT patches have been merged into mainline the baseline stable releases will have the patches however we need to figure out how the testing will be handled, currently the stable maintainers rely on other people and organizations to do the bulk of their testing. We...

98. Continuous Integration for mainline Real-Time Linux

Mr Bastian Germann

8/24/20, 9:00 AM

Soon, the Real-Time Linux project will have its PREEMPT_RT patches in mainline Linux. One part of the Real-Time Linux collaboration project is its continuous integration system CI-RT (https://github.com/ci-rt) with one known lab running (https://ci-rt.linutronix.de).

In this talk, a possible way how to run the existing CI-RT tests on mainline Linux will be presented. Additionally, possible...

190. The usage of PREEMPT_RT in safety-critical systems: what do we need to do?

Mr Lukas Bulwahn

8/24/20, 9:25 AM

This session shall shed some light on what needs to be done to use PREEMPT_RT in safety-critical systems.

For a structured discussion, this session first introduces:

• different types of assumed example systems, and the criticality of the real-time property in those systems,
• derived real-time requirements towards the kernel and hardware, and
• different general strategies described...

144. Identifying Sources of OS Noise

Clark Williams (Red Hat), Juri Lelli (Red Hat)

8/24/20, 10:10 AM

This topic focuses on identifying sources of operating system “noise”, primarily for polling mode latency-sensitive applications on Linux. What do we mean by operating system noise? We mean things external to an application that can affect execution of the application in a negative way, usually meaning a delay in execution causing missed deadlines. The intent here is to identify the most...

118. PREEMPT_RT: status and Q&A

Thomas Gleixner

8/24/20, 10:35 AM

In this talk, Thomas Gleixner will present the status of the PREEMPT_RT, along
with a section of questions and answers regarding the upstream work and the
future of the project.