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description/scheduler: Reduce stacking and overscheduling

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2021-10-29 22:03:33 +08:00
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@@ -900,7 +900,7 @@ Mike Galbraith 调试发现, 触发这个问题的原因是因为 wake_affine_we
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:---:|:----------:|:----:|
| 2021/09/20 | Mel Gorman <mgorman@techsingularity.net> | [Scale wakeup granularity relative to nr_running](https://lore.kernel.org/lkml/20210920142614.4891-1-mgorman@techsingularity.net) | 在任务迁移或唤醒期间, 将决定是否抢占当前任务. 为了限制过度调度, 可以通过设置 sysctl_sched_wakeup_granularity 来延迟抢占, 以便在抢占之前允许至少一定的运行时间. 但是, 当任务堆叠而造成域严重过载时(例如 hackbench 测试), 过度调度的程度仍然很严重. 而且由于许多时间被调度器浪费在重新安排任务(切换等)上, 这会进一步延长过载状态. 这组补丁根据 CPU 上正在运行的任务数在 wakeup_gran() 中扩展唤醒粒度, 默认情况下最大可达 8ms. 其目的是允许任务在过载时运行更长时间, 以便某些任务可以更快地完成, 并降低域过载的程度. | v1 ☐ | [PatchWork v1](https://lore.kernel.org/lkml/20210920142614.4891-1-mgorman@techsingularity.net), [LKML](https://lkml.org/lkml/2021/9/20/478) |
| 2021/10/21 | Mel Gorman <mgorman@techsingularity.net> | [Reduce stacking and overscheduling](https://lkml.org/lkml/2021/10/21/661) | NA | v1 ☐ | [2021/10/21 LKML 0/2](https://lkml.org/lkml/2021/10/21/661), [LKML v4 0/2](https://lkml.org/lkml/2021/10/28/226) |
| 2021/10/28 | Mel Gorman <mgorman@techsingularity.net> | [Reduce stacking and overscheduling](https://lkml.org/lkml/2021/10/21/661) | Mike Galbraith 发现引起 CPU 上任务堆积的原因是 wake_affine_weight() 流程与 cpu_load() 更新路径的互不感知造成的, 因此进行了修复. | v1 ☐ | [2021/10/21 LKML 0/2](https://lkml.org/lkml/2021/10/21/661), [2021/10/28 LKML v4 0/2](https://lkml.org/lkml/2021/10/28/226) |
# 5 select_task_rq