Linux kernel process schedulers

Completely Fair Scheduler

The Completely Fair Scheduler (CFS) is a process scheduler that was merged into the 2.6.23 (October 2007) release of the Linux kernel and is the default scheduler of the tasks of the SCHED_NORMAL class (i.e., tasks that have no real-time execution constraints). It handles CPU resource allocation for executing processes, and aims to maximize overall CPU utilization while also maximizing interactive performance. In contrast to the previous O(1) scheduler used in older Linux 2.6 kernels, which maintained and switched run queues of active and expired tasks, the CFS scheduler implementation is based on per-CPU run queues, whose nodes are time-ordered schedulable entities that are kept sorted by redโ€“black trees. The CFS does away with the old notion of per-priorities fixed time-slices and instead it aims at giving a fair share of CPU time to tasks (or, better, schedulable entities). (Wikipedia).

Completely Fair Scheduler
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Related pages

Stride scheduling | Run queue | Brain Fuck Scheduler | O(1) scheduler | Redโ€“black tree | SCHED DEADLINE | Fair-share scheduling | Logarithm