Evolution of Suspend-to-Idle Support in the Linux Kernel

Explore the evolution of suspend-to-idle support in the Linux kernel through this 47-minute conference talk from linux.conf.au 2021. Delve into the complexities of implementing system-wide suspend without relying on platform support, including challenges with CPU idle states, scheduler ticks, and interrupt handling. Learn about the iterative development process, driven by user feedback, that has shaped this feature since its inception in 2013. Gain insights into the intricacies of ACPI systems, the distinction between wakeup and non-wakeup events, and the ongoing refinements to the Linux kernel's suspend-to-idle code. Follow the speaker's journey through multiple kernel versions, examining key changes and the reasoning behind them.