Backport the support for cluster scheduler level · Pull Request !246 · OpenCloudOS/OpenCloudOS-Kernel

#### 【PR介绍】
This PR has 5 series:
When the switch is turned off (kernel.sched_cluster=0 && SIS_UTIL=false), it does not affect the original schedule

1st series: make kernel aware of cluster, expose cluster to sysfs ABI and add SCHED_CLUSTER which can make load balance between clusters to benefit lots of workload. This has been merged into mainline:
https://lore.kernel.org/lkml/20210924085104.44806-1-21cnbao@gmail.com/

2nd series: Fix two bugs in cluster scheduler

3rd series: This is the follow-up work to support cluster scheduler. Previously we have added cluster level in the scheduler for both ARM64[1] and X86[2] to support load balance between clusters to bring more memory bandwidth and decrease cache contention. This patchset, on the other hand, takes care of wake-up path by giving CPUs within the same cluster a try before scanning the whole LLC to benefit those tasks communicating with each other.

4rd series: Introduce SIS_UTIL to search idle CPU based on sum of util_avg to reduce time spent on select_idle_cpu().But the UTIL feature is turned off by default and the PROP feature keeps enabled.
0583e3fcc24f sched/fair: Fix kabi borken in sched_domain_shared
ee1d60d88443 sched/fair:ARM64 enables SIS_UTIL and disables SIS_PROP
ad3b1a2e78aa sched/fair:keeping enabling SIS_PROP and disabling SIS_UTIL

5rd series: Fix one bugs in cluster scheduler
This has been merge in mainline:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4cc4cc28ec4154c4f1395648ab67ac9fd3e71fdc

| commitId     | 名称                                                                             | 是否冲突 | 冲突原因                                                              | 关闭是否影响原调度 | 原因              |
| ------------ | ------------------------------------------------------------------------------ | ---- | ----------------------------------------------------------------- | --------- | --------------- |
| 09d153b00 | topology: Represent clusters of CPUs within a die                              | 是    | Documentation的位置和格式发生变化。部分代码的相对位置发生变化                             | 否         | 新增cluster结构     |
| 4d7341416 | sched: Add cluster scheduler level in core and related Kconfig for ARM64       | 否    |                                                                   | 否         | 新增cluster调度级别   |
| 145d7dc35 | topology/sysfs: export cluster attributes only if an architectures has support | 是    | Documentaion的位置发生变化，按照4.19内核的原位置修改。部分代码发生重构，相对位置发生变化，基于4.19内核添加修改 | 否         | 限制属性在已支持平台可用    |
| c0ec47ce1 | topology: Remove unused cpu_cluster_mask()                                     | 否    |                                                                   | 否         | 对9af57e69c315修改 |
| a36a357fb | arch_topology: Limit span of cpu_clustergroup_mask()                           | 是    | 4.19内核到5.10内核存在重构，修改点所在的文件位置发生变化，基于4.19内核进行修改                     | 否         | 对1b13f2fb8f8b修改 |
| 84165d3b7 | arch_topology: Make cluster topology span at least SMT CPUs                    | 是    | 代码所在的文件位置发生变化，按照4.19内核中的原位置修改                                     | 否         | 对9c1386d3a2d2修改 |
| 6ed05224a | sched: Add per_cpu cluster domain info and cpus_share_lowest_cache API         | 是    | SD_CLUSTER的声明方式在4.19内核到5.10内核之间存在重构，这里使用4.19内核的声明方式               | 否         | 新增接口            |
| d74f364bc | sched/fair: Scan cluster before scanning LLC in wake-up path                   | 是    | select_idle_cpu这个函数在4.19内核到5.10内核之间存在重构，这里基于4.19内核的函数，修改patch的内容  | 否         | 该特性在开关关闭时不生效    |
| 881997e5c | scheduler: Create SDTL_SKIP flag to skip topology level                        | 是    | 当前4.19分支的CONFIG_SCHED_SMT默认为n，需要考虑sched_cluster作为调度域最低层级的情况       | 否         | 新增标签            |
| 9cc08a8c5 | scheduler: Add runtime knob sysctl_sched_cluster                               | 是    | 部分代码的相对位置发生变化                                                     | 否         | 添加运行时开关         |
| 639738704 | scheduler: Add boot time enabling/disabling of cluster scheduling              | 否    |                                                                   | 否         | 添加启动时开关         |
| 20abeb721 | scheduler: Disable cluster scheduling by default                               | 否    |                                                                   | 否         | 默认关闭cluster调度   |
| c21b50f4a | sched:Open the kernel configuration for cluster.                               | 是    | 修改arch/arm64/configs/tencent.config文件                             | 否         | 开启内核中cluster配置  |
| 68dd93a27 | sched/fair: Introduce SIS_UTIL to search idle CPU based on sum of util_avg     | 是    | 部分代码位置发生变化                                                        | 否         | UTIL关闭时该特性不生效   |
| 0e73bba4a | sched/fair: Fix kabi borken in sched_domain_shared                             | 是    | 部分代码位置发生变化                                                        | 否         |                 |
| 7d3c95111 | sched/fair:ARM64 enables SIS_UTIL and disables SIS_PROP                        | 是    | 部分代码位置发生变化                                                        | 否         |                 |
| c200d152f | sched/fair:keeping enabling SIS_PROP and disabling SIS_UTIL                    | 否    |                                                                   | 否         | 默认关闭 SIS_UTIL   |
| 1cd8093b9 | arch_topology: Fix missing clear cluster_cpumask in remove_cpu_topology()      | 否    |                                                                   | 否         | bugfix          |

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