This tutorial addresses the current and emerging real-time capabilities offered by embedded Linux. In particular, the session details the function and performance attributes of the Preemptible Linux Kernel, the O(1) scheduler and High Resolution POSIX Timers in current implementations. Looking forward, the session covers use of prioritizable work queues in the 2.6 kernel, and the evolution of Linux to support capabilities that include prioritized queuing and priority-inheritance at critical regions, and prioritized interrupt processing. Underlying all session content is the goal of preserving the value of Linux as an open, enterprise-class, standards-compliant platform. Therefore, discussion of on-going Linux progress towards native RTOS-type performance assumes the preservation of existing APIs and semantics, without recourse to sub-kernels or other proprietary technology.