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description/memory: update to day 20211105

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study/kernel/00-DESCRIPTION/MEMORY_MANAGER.md
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@@ -1533,7 +1533,7 @@ PREEMPT-RT PATCH 的核心思想是最小化内核中不可抢占部分的代码
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:----:|:---------:|:----:|
| 2020/08/03 | Peter Oskolkov <posk@google.com>/<posk@posk.io> | [FUTEX_SWAP](https://lore.kernel.org/patchwork/cover/1433967) | 通过对 futex 的魔改, 使得在用户态使用 switch_to() 指定任务切换的能力. 这就是用户模式线程的用途: 极低的切换开销, 意味着我们操作系统可以支持的数以千计的线程可以提高到 10 倍以上甚至百万级别. | [2020/06/15 PatchWork RFC,0/3](https://lore.kernel.org/patchwork/cover/1256264)<br>*-*-*-*-*-*-*-* <br>[2020/06/16 PatchWork RFC,0/3,v2](https://lore.kernel.org/patchwork/cover/1257233)<br>*-*-*-*-*-*-*-* <br>[2021/07/16 PatchWork RFC,0/3,v3](https://lore.kernel.org/patchwork/cover/1263506)<br>*-*-*-*-*-*-*-* <br>[2020/08/03 PatchWork for,5.9,v2,0/4](https://lore.kernel.org/patchwork/cover/1283798) |
| 2021/10/12 | Peter Oskolkov <posk@google.com>/<posk@posk.io> | [sched,mm,x86/uaccess: implement User Managed Concurrency Groups](https://lore.kernel.org/patchwork/cover/1433967) | UMCG (User-Managed Concurrency Groups) | [PatchWork RFC,v0.1,0/9](https://lore.kernel.org/patchwork/cover/1433967)<br>*-*-*-*-*-*-*-* <br>[2021/07/08 PatchWork RFC,0/3,v0.2](https://lore.kernel.org/patchwork/cover/1455166)<br>*-*-*-*-*-*-*-* <br>[2021/07/16 PatchWork RFC,0/4,v0.3](https://lore.kernel.org/patchwork/cover/1461708)<br>*-*-*-*-*-*-*-* <br>[2021/08/01 PatchWork 0/4,v0.4](https://lore.kernel.org/patchwork/cover/1470650)<br>*-*-*-*-*-*-*-* <br>[2021/08/01 LWN 0/4,v0.5](https://lore.kernel.org/patchwork/cover/1470650)<br>*-*-*-*-*-*-*-* <br>[2021/10/12 PatchWork v0.7,0/5](https://patchwork.kernel.org/project/linux-mm/cover/20211012232522.714898-1-posk@google.com) |
| 2021/11/04 | Peter Oskolkov <posk@google.com>/<posk@posk.io> | [sched,mm,x86/uaccess: implement User Managed Concurrency Groups](https://lore.kernel.org/patchwork/cover/1433967) | UMCG (User-Managed Concurrency Groups) | [PatchWork RFC,v0.1,0/9](https://lore.kernel.org/patchwork/cover/1433967)<br>*-*-*-*-*-*-*-* <br>[2021/07/08 PatchWork RFC,0/3,v0.2](https://lore.kernel.org/patchwork/cover/1455166)<br>*-*-*-*-*-*-*-* <br>[2021/07/16 PatchWork RFC,0/4,v0.3](https://lore.kernel.org/patchwork/cover/1461708)<br>*-*-*-*-*-*-*-* <br>[2021/08/01 PatchWork 0/4,v0.4](https://lore.kernel.org/patchwork/cover/1470650)<br>*-*-*-*-*-*-*-* <br>[2021/08/01 LWN 0/4,v0.5](https://lore.kernel.org/patchwork/cover/1470650)<br>*-*-*-*-*-*-*-* <br>[2021/10/12 PatchWork v0.7,0/5](https://patchwork.kernel.org/project/linux-mm/cover/20211012232522.714898-1-posk@google.com)<br>*-*-*-*-*-*-*-* <br>[2021/11/04 PatchWork v0.8,0/6](https://patchwork.kernel.org/project/linux-mm/cover/20211104195804.83240-1-posk@google.com) |
| 2021/09/08 | Peter Oskolkov <posk@google.com>/<posk@posk.io> | [google ghOSt](https://github.com/google/ghost-kernel) | ghOSt 是在 Linux 内核上实现的用户态调度策略的通用代理. ghOSt 框架提供了一个丰富的 API, 该 API 从用户空间接收进程的调度决策, 并将其作为事务执行. 程序员可以使用任何语言或工具来开发策略, 这些策略可以在不重新启动机器的情况下升级. ghOSt 支持一系列调度目标的策略, 从 µs 级延迟到吞吐量, 再到能源效率, 等等, 并且调度操作的开销较低. 许多策略只是几百行代码. 总之, ghOSt 提供了一个性能框架, 用于将线程调度策略委托给用户空间进程, 从而实现策略优化、无中断升级和故障隔离. | [github kernel](https://github.com/google/ghost-kernel)<br>*-*-*-*-*-*-*-* <br>[github userspace](https://github.com/google/ghost-userspace) |