1. 30 1月, 2008 10 次提交
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    • P
      sched: high-res preemption tick · 8f4d37ec
      Peter Zijlstra 提交于
      Use HR-timers (when available) to deliver an accurate preemption tick.
      
      The regular scheduler tick that runs at 1/HZ can be too coarse when nice
      level are used. The fairness system will still keep the cpu utilisation 'fair'
      by then delaying the task that got an excessive amount of CPU time but try to
      minimize this by delivering preemption points spot-on.
      
      The average frequency of this extra interrupt is sched_latency / nr_latency.
      Which need not be higher than 1/HZ, its just that the distribution within the
      sched_latency period is important.
      Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      8f4d37ec
  4. 15 1月, 2008 1 次提交
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