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V6.2 timerslack+cgroups#1

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Commits on Mar 28, 2023

• augmented rbtree: Add the rb_add helper equivalents to augmented rbtree.

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• timerqueue: Support using augmented rbtree for timers.

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• hrtimer: Greedy algorithm for hrtimer expiry time.

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Commits on Mar 30, 2023

• sched, treewide: Convert readers of task->timer_slack_ns to use helper.

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Commits on Apr 4, 2023

• sched: Abstract out the default timer slack to get_task_timer_slack_ns.

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Commits on Apr 11, 2023

• hrtimer: Allow running (soft) timers opportunistically after soft timeout.

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• hrtimer, sched/idle: Run soft-expired hrtimers opportunistically before idle.

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• cgroup: Add a filtered CSS iterator.

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• cgroup: introduce per cgroup timer slack.

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