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scheduler: Migrate Disable Fix

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Cheng Jian
2021-02-23 22:00:27 +08:00
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study/kernel/00-DESCRIPTION/SCHEDULER.md
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@@ -456,7 +456,7 @@ https://lore.kernel.org/lkml/157476581065.5793.4518979877345136813.stgit@buzz/
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:----:|:---------:|:----:|
| 2021/02/21 | JHuaixin Chang | [[RFC,00/60] Coscheduling for Linux](https://lore.kernel.org/patchwork/cover/983568) | 突发任务的带宽控制优化, 通过临时之前剩余累计的配额, 使得突发进程在当前周期的配额突然用尽之后, 还可以临时使用之前累计的配额使用, 从而降级突发任务的时延. | RFC ☑ 5.9-rc1 | [ 2020/12/17 v1](https://lore.kernel.org/patchwork/cover/1354613)<br>*-*-*-*-*-*-*-*<br>[2021/01/20 v2](https://lore.kernel.org/patchwork/cover/1368037)<br>*-*-*-*-*-*-*-*<br>[2021/01/21 v3](https://lore.kernel.org/patchwork/cover/1368747/)<br>*-*-*-*-*-*-*-*<br>[ 2021-02-02 v4](https://lore.kernel.org/patchwork/cover/1374195) |
| 2021/02/21 | JHuaixin Chang | [[RFC,00/60] Coscheduling for Linux](https://lore.kernel.org/patchwork/cover/983568) | 突发任务的带宽控制优化, 通过临时之前剩余累计的配额, 使得突发进程在当前周期的配额突然用尽之后, 还可以临时使用之前累计的配额使用, 从而降低突发任务的时延. | RFC ☑ 5.9-rc1 | [ 2020/12/17 v1](https://lore.kernel.org/patchwork/cover/1354613)<br>*-*-*-*-*-*-*-*<br>[2021/01/20 v2](https://lore.kernel.org/patchwork/cover/1368037)<br>*-*-*-*-*-*-*-*<br>[2021/01/21 v3](https://lore.kernel.org/patchwork/cover/1368747/)<br>*-*-*-*-*-*-*-*<br>[ 2021-02-02 v4](https://lore.kernel.org/patchwork/cover/1374195) |
## 1.2.2 实时进程的组调度支持(RT Group Scheduling)
@@ -893,7 +893,7 @@ Linux 内核会将大量(并且在不断增加中)工作放置在内核线程中
|:----:|:----:|:---:|:----:|:---------:|:----:|
| 2020/09/17 | Thomas Gleixner | [sched: Migrate disable support for RT](https://lore.kernel.org/patchwork/cover/1307272) | 在启用 PREEMPT_RT 的内核上, 包括spin/rw锁持有部分在内的大部分代码都是可抢占的, 也使得任务可以迁移. 这违反了每个CPU的约束. 因此, PREEMPT_RT 需要一种独立于抢占的机制来控制迁移. | v1 ☐ | [PatchWork](https://lwn.net/Articles/1307272) |
| 2020/10/23 | Peter Zijlstra | [sched: Migrate disable support](https://lore.kernel.org/patchwork/cover/1323936) | Peter 自己实现的 Migrate disable | v4 ☑ 5.11-rc1 | [2020/09/11 preparations](https://lore.kernel.org/patchwork/cover/1304210)<br>*-*-*-*-*-*-*-* <br>[2020/09/21 v1 PatchWork](https://lore.kernel.org/patchwork/cover/1309702)<br>*-*-*-*-*-*-*-* <br>[2020/10/23 v4 PatchWork](https://lore.kernel.org/patchwork/cover/1323936) |
| 2021/01/16 | Peter Zijlstra | [sched: Fix hot-unplug regressions](https://lore.kernel.org/patchwork/cover/1366383) | 修复 Migrate Disable 合入后导致的 CRASH 问题 | v3 ☑ 5.11-rc1 | [sched: Fix hot-unplug regression](https://lore.kernel.org/patchwork/cover/1368710) |
| 2021/01/16 | Peter Zijlstra | [sched: Fix hot-unplug regressions](https://lore.kernel.org/patchwork/cover/1366383) | 修复 Migrate Disable 合入后导致的 CRASH 问题 | v3 ☑ 5.11-rc1 | [021/01/16 V1](https://lore.kernel.org/patchwork/cover/1366383)<br>*-*-*-*-*-*-*-*<br>[2021/01/21 V2](https://lore.kernel.org/patchwork/cover/1368710) |
接着 Thomas Gleixner 完成了 KMAP_LOCAL API.
@@ -902,6 +902,7 @@ Linux 内核会将大量(并且在不断增加中)工作放置在内核线程中
| 2020/09/17 | Thomas Gleixner | [mm/highmem: Preemptible variant of kmap_atomic & friends](https://lore.kernel.org/patchwork/cover/1341244) | 此处填写补丁描述 | v4 ☑ 5.11-rc1 | [v3 PatchWork](https://lore.kernel.org/patchwork/cover/1331277) <br>*-*-*-*-*-*-*-* <br>[v4 PatchWork](https://lore.kernel.org/patchwork/cover/1341244) |
| 2021/01/12 | Thomas Gleixner | [mm/highmem: Fix fallout from generic kmap_local conversions](https://lore.kernel.org/patchwork/cover/1364171) | 此处填写补丁描述| v1 ☐ | [v4 PatchWork](https://lore.kernel.org/patchwork/cover/1364171) |
后来主线上 Dexuan Cui 报 Migrate Disable 合入后引入了问题, [5.10: sched_cpu_dying() hits BUG_ON during hibernation: kernel BUG at kernel/sched/core.c:7596!](https://lkml.org/lkml/2020/12/22/141). Valentin Schneider 怀疑是有些 kworker 线程在 CPU 下线后又选到了下线核上运行, 因此建议去测试这组补丁 [workqueue: break affinity initiatively](https://lkml.org/lkml/2020/12/18/406). Dexuan Cui 测试以后可以解决这个问题, 但是会有其他 WARN. Peter Zijlstra 的 解决方案如下 [sched: Fix hot-unplug regression](https://lore.kernel.org/patchwork/cover/1368710).
# 1.9 调试信息
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