Real Time

This page has information about Real-time usage of Linux. Also this page has information about timing systems for Linux. This is of interest to CE Linux Forum members, because many consumer electronics products have realtime requirements (e.g. in the areas of multi-media presentation, or communications)

Real Time Wiki

• Please note that the primary source of information for Real Time Linux information is the new RTWiki.

Technology/Project pages

• Realtime Preemption - Ingo Molnar's patchset to add realtime preemption to the 2.6 Linux kernel
• Kernel Timer Systems - Various new proposals for changing the kernel timing system
• Soft IRQ Threads - Technology to put SoftIRQs in threads so they can be preempted.
  • NOTE: Soft IRQ threads are now (Oct 2007) incorporated into the Realtime Preemption patch
• High Resolution Timers - A system to support timers with sub-jiffy resolution
• Variable Scheduling Timeouts - A system to support variable timeouts for periodic system activities (also known as Tickless)

Documents

• CELF Realtime Specification (from 2004, so it's pretty old)
• Realtime Preemption presentation by Manas at the 2005 CELF Technical Conference - Media:Real-Time-Preemption-Patchset.pdf

Open Source Projects/Mailing Lists

• RTAIFusion put link here - Dual-kernel project. Fusion adds emphasis for support for realtime in user-space.