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descrption: scheduler

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@@ -674,17 +674,27 @@ NUMA 机器一个重要特性就是不同 node 之间的内存访问速度有差
| 2020/03/11 | [sched: Streamline select_task_rq() & select_task_rq_fair()](https://lore.kernel.org/patchwork/patch/1208449) | 选核流程上的重构和优化, 当然除此之外还做了其他操作, 比如清理了 sd->flags 信息, 甚至 sysfs 接口都变成只读了 | | |
| 2020/03/11 | [sched: Instrument sched domain flags](https://lore.kernel.org/patchwork/cover/1208463) | 基于上一组补丁, 重构了 SD_FLAGS 的定义 | | |
## 1.5.4
## 1.5.4 load_balance 的其他优化
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Mel Gorman 深耕与解决 load_balance 一些不合理的行为.
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:---:|:----------:|:----:|
| 2017/12/18 | Mel Gorman | [Reduce scheduler migrations due to wake_affine](https://lore.kernel.org/patchwork/cover/864391) | 减少 wake_affine 机制和 load_balance 的冲突 | | [PatchWork](https://lore.kernel.org/patchwork/cover/864391)
| 2017/12/18 | Mel Gorman | [Reduce scheduler migrations due to wake_affine](https://lore.kernel.org/patchwork/cover/864391) | 减少 wake_affine 机制和 load_balance 的冲突 | | [PatchWork](https://lore.kernel.org/patchwork/cover/864391) |
| 2018/01/30 | Mel Gorman | [Reduce migrations and unnecessary spreading of load to multiple CPUs](https://lore.kernel.org/patchwork/cover/878789) | 减少不合理的迁移 | v1 ☑ 4.16-rc1 | [PatchWork](https://lore.kernel.org/patchwork/cover/878789) |
| 2018/02/12 | Mel Gorman | [Reduce migrations due to load imbalance and process exits](https://lore.kernel.org/patchwork/cover/886577) | 优化退出场景时的不合理迁移行为 | v1 ☑ 4.17-rc1 | [PatchWork](https://lore.kernel.org/patchwork/cover/886577) |
| 2018/02/12 | Mel Gorman | [Stop wake_affine fighting with automatic NUMA balancing](https://lore.kernel.org/patchwork/cover/886622) | 处理 NUMA balancing 和 wake_affine 的冲突 | v1 | [PatchWork](https://lore.kernel.org/patchwork/cover/886622) |
| 2018/02/13 | Mel Gorman | [Reduce migrations and conflicts with automatic NUMA balancing v2](https://lore.kernel.org/patchwork/cover/886940) | 处理 NUMA balancing 与负载均衡的冲突 | v1 | [PatchWork](https://lore.kernel.org/patchwork/cover/886940) |
Vincent Guittot 深耕与解决 load_balance 各种疑难杂症和不均衡状态, 特别是优化他对终端等嵌入式场景的性能.
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:---:|:----------:|:----:|
| 2017/12/18 | Vincent Guittot | [sched/fair: Improve fairness between cfs tasks](https://lore.kernel.org/patchwork/cover/1308748) | 当系统没有足够的周期用于所有任务时，调度器必须确保在CFS任务之间公平地分配这些cpu周期. 某些用例的公平性不能通过在系统上静态分配任务来解决，需要对系统进行周期性的再平衡但是，这种动态行为并不总是最优的，也不总是能够确保CPU绑定的公平分配. <br>这组补丁通过减少选择可迁移任务的限制来提高公平性. 这个更改可以降低不平衡阈值，因为 1st LB将尝试迁移完全匹配不平衡的任务. | v1 ☑ 5.10-rc1 | [PatchWork](https://lore.kernel.org/patchwork/cover/1308748) |
| 2021/01/06 | Vincent Guittot | [Reduce number of active LB](https://lore.kernel.org/patchwork/cover/1361676) | 减少 ACTIVE LOAD_BALANCE 的次数 | v2 ☑ 5.10-rc1 | [PatchWork](https://lore.kernel.org/patchwork/cover/1361676) |
| 2021/01/06 | Vincent Guittot | [move update blocked load outside newidle_balance](https://lore.kernel.org/patchwork/cover/1383963) |oel报告了newidle_balance中的抢占和irq关闭序列很长，因为大量的CPU cgroup正在使用，并且需要更新。这个补丁集将更新移动到newidle_imblance之外。这使我们能够在更新期间提前中止。在选择并进入空闲状态之前，触发CPU空闲线程中的统计数据更新，而不是踢一个正常的ILB来唤醒已经处于空闲状态的CPU。 | v2 ☑ 5.10-rc1 | [PatchWork](https://lore.kernel.org/patchwork/cover/1361676) |
# 1.6 pick_next_task
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