[devel-5.10-rt]sched: Fix migrate_disable() vs rt/dl balancing · Pull Request !9 · anolis/embedded-kernel

sched: Fix migrate_disable() vs rt/dl balancing
description：
In order to minimize the interference of migrate_disable() on lower
priority tasks, which can be deprived of runtime due to being stuck
below a higher priority task. Teach the RT/DL balancers to push away
these higher priority tasks when a lower priority task gets selected
to run on a freshly demoted CPU (pull).

This adds migration interference to the higher priority task, but
restores bandwidth to system that would otherwise be irrevocably lost.
Without this it would be possible to have all tasks on the system
stuck on a single CPU, each task preempted in a migrate_disable()
section with a single high priority task running.

This way we can still approximate running the M highest priority tasks
on the system.

Migrating the top task away is (ofcourse) still subject to
migrate_disable() too, which means the lower task is subject to an
interference equivalent to the worst case migrate_disable() section.

upstream:
4daccf68f6910e0ac30df2eb80ae25fc04afaa55

类型	指派人员	状态
审查	ralf003 已审查通过 meganz009 liuchun22 ZTE-HuangJian	已完成 (1/1人)
测试	ralf003 已测试通过 ranmaosheng 已测试通过 meganz009 已测试通过杨洋已测试通过 liuchun22 已测试通过 ZTE-HuangJian 已测试通过	已完成 (6/1人)

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