This week at LWN: SCHED_FIFO and realtime throttling
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The SCHED_FIFO scheduling class is a longstanding, POSIX-specified realtime feature. Processes in this class are given the CPU for as long as they want it, subject only to the needs of higher-priority realtime processes. If there are two SCHED_FIFO processes with the same priority contending for the CPU, the process which is currently running will continue to do so until it decides to give the processor up. SCHED_FIFO is thus useful for realtime applications where one wants to know, with great assurance, that the highest-priority process on the system will have full access to the processor for as long as it needs it.
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