Real-Time Linux Kernel Scheduler

 in
The -rt patchset, or just -rt, adds real-time scheduling capabilities to the Linux kernel.
Summary

The most important goal of a real-time kernel scheduler is to ensure SWSRPS. The scheduler in the CONFIG_PREEMPT_RT kernel uses push and pull algorithms to balance and correctly distribute real-time tasks across the system. Both the push and pull operations try to ensure that a real-time task gets an opportunity to run as soon as possible. Also, in order to reduce the performance and scalability impact that might result from increased contention of global variables, the scheduler uses the concept of root domains and CPU priority management. The scope of the global variables is reduced to a subset of CPUs as opposed to the entire system, resulting in significant reduction of cache penalties and performance improvement.

Legal Statement

This work represents the views of the author and does not necessarily represent the view of IBM. Linux is a copyright of Linus Torvalds. Other company, product and service names may be trademarks or service marks of others.

Ankita Garg, a computer science graduate from the P.E.S. Institute of Technology, works as a developer at the Linux Technology Centre, IBM India. She currently is working on the Real-Time Linux Kernel Project. You are welcome to send your comments and suggestions to ankita@in.ibm.com.

______________________

Webinar
One Click, Universal Protection: Implementing Centralized Security Policies on Linux Systems

As Linux continues to play an ever increasing role in corporate data centers and institutions, ensuring the integrity and protection of these systems must be a priority. With 60% of the world's websites and an increasing share of organization's mission-critical workloads running on Linux, failing to stop malware and other advanced threats on Linux can increasingly impact an organization's reputation and bottom line.

Learn More

Sponsored by Bit9

Webinar
Linux Backup and Recovery Webinar

Most companies incorporate backup procedures for critical data, which can be restored quickly if a loss occurs. However, fewer companies are prepared for catastrophic system failures, in which they lose all data, the entire operating system, applications, settings, patches and more, reducing their system(s) to “bare metal.” After all, before data can be restored to a system, there must be a system to restore it to.

In this one hour webinar, learn how to enhance your existing backup strategies for better disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible bare-metal recovery solution for UNIX and Linux systems.

Learn More

Sponsored by Storix