Linux: CFS Group Level Fairness
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Following a review of Ingo Molnar's Completely Fair Scheduler, Srivatsa Vaddagiri posted a patch allowing the new scheduler to provide fairness at a per-group level rather than at a per-process level. He described the changes that he made and noted,"I have used'uid' as the basis of grouping for timebeing (since that grouping concept is already in mainline today). The patch can be adapted to a moregeneric process grouping mechanism later."Ingo reacted to the patch favorably,"yeah, i like this alot." He went on to comment,"the'struct sched_entity' abstraction looks very clean, and that's the main thing that matters: it allows for a design that will only cost us performance if group scheduling is desired."
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