Enabling Push Callback in Fair Class

Explore the implementation of push callback mechanisms in the Linux kernel's fair scheduling class through this 21-minute conference talk from the Linux Plumbers Conference. Learn how push callbacks can address limitations in current task migration strategies that rely solely on wakeup paths and periodic load balancing. Discover how Energy Aware Scheduling (EAS) systems can benefit from push mechanisms when periodic load balancing is disabled, and understand how non-EAS systems can leverage task pushing to idle CPUs. Examine the current status of push callback implementation, analyze how these mechanisms could potentially replace periodic load balancing in specific scenarios, and discuss the open questions and challenges surrounding this kernel scheduling enhancement.