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Frederic Weisbecker edited this page · 21 revisions
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  • Handle perf_event_task_tick()
  • Ensure irq work use self-IPIs and not hooks on the timer
  • Revisit the idle load balancing logic to make it working with adaptive tickless kernels.
  • Add some automated debugging checks that ensure we are not dealing with stale rq clock values due to missing update_[nohz_]rq_clock() calls. This could be done by using accessors like rq_clock() and rq_clock_task() that check that rq->clock value is not too far from sched_clock_cpu() if CONFIG_DEBUG_SCHED. That's would be a bit heuristic but better than nothing.
  • Handle update_cpu_load_active() (I'm pretty scared of that part)
  • We could shut down the tick even when more than one tasks are running using hrtick for preemption. But peterz said it's a bit broken and can be costly due to frequent writes on the hardware clock. That needs testing I think. This may be a win compared to keeping the periodic tick.
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