[5.10]anolis: sched: introduce ID_BOOK_CPU · Pull Request !5455 · anolis/cloud-kernel

bugzilla: https://bugzilla.openanolis.cn/show_bug.cgi?id=22143

In high-concurrency scenarios, highclass tasks often select the same
    idle CPU when waking up, which can cause scheduling delays. The reason
    is that To reduce
    the scheduling delays caused by this situation, we introduce
    ID_BOOK_CPU:
    
    When highclass task selecting idle cpu, check whether it has been
    booked by other tasks and whether it's still idle before we select it
    to wake up. If the idle cpu we found has been booked by other tasks,
    select again, until book the idle cpu successfully or reach the retry
    limit. If the idle cpu hasn't been booked by any other, make rq->booked
    true to mark that the cpu is booked, and make rq->booked false after the
    highclass task actually enqueues into the rq of the cpu. The operation
    of read and write about rq->booked are both in rq->lock hold state.
    
    To Enable ID_BOOK_CPU,
    echo ID_BOOK_CPU > /sys/kernel/debug/sched_features.
    
    To set retry limit, modify /proc/sys/kernel/sched_id_book_cpu_nr_tries.

类型	指派人员	状态
审查	winterddd xueshuai 赵鑫鹏陶义 dtc health_jay	已完成 (0/0人)
测试	小龙已测试通过	已完成 (1/1人)

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