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Cheng Jian
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2 **OpenAnolis cloud-kernel 分析**
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=====================
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[Alibaba Cloud Linux 2](https://help.aliyun.com/document_detail/154950.html)
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[Alibaba Cloud Linux 2功能和接口概述](https://help.aliyun.com/document_detail/177687.html)
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如果您对Linux的内核系统有一定的了解，并且有需求需要使用Linux内核功能，您可以依据下表提供的Alibaba Cloud Linux 2的内核功能与接口进行相关操作.
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| 文档链接 | 说明 |
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|:-------:|:----:|
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| 启用cgroup writeback功能 | Alibaba Cloud Linux 2在内核版本4.19.36-12.al7中，对内核接口cgroup v1新增了控制群组回写(cgroup writeback)功能. 该功能使您在使用内核接口cgroup v1时，可以对缓存异步I/O (Buffered I/O) 进行限速. |
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| blk-iocost权重限速 | Alibaba Cloud Linux 2在内核版本4.19.81-17.al7.x86_64开始支持基于成本模型(cost model)的权重限速功能，即blk-iocost功能. 该功能是对内核中IO子系统(blkcg)基于权重的磁盘限速功能的进一步完善. |
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| 在cgroup v1接口开启PSI功能 | Alibaba Cloud Linux 2在内核版本4.19.81-17.al7中为cgroup v1接口提供了PSI功能. PSI(Pressure Stall Information)是一个可以监控CPU、内存及IO性能异常的内核功能. |
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| 修改TCP TIME-WAIT超时时间 | 在Linux的内核中，TCP/IP协议的TIME-WAIT状态持续60秒且无法修改. 但在某些场景下，例如TCP负载过高时，适当调小该值有助于提升网络性能. 因此Alibaba Cloud Linux 2在内核版本4.19.43-13.al7新增内核接口，用于修改TCP TIME-WAIT超时时间. |
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| Block IO限流增强监控接口 | 为了更方便地监控Linux block IO限流，Alibaba Cloud Linux 2在内核版本4.19.81-17.al7增加相关接口，用于增强block IO限流的监控统计能力. |
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| JBD2优化接口 | JBD2作为ext4文件系统的内核线程，在使用过程中常会遇到影子状态(BH_Shadow)，影响系统性能. 为解决使用JBD2过程中出现的异常，Alibaba Cloud Linux 2在内核版本4.19.81-17.al7对JBD2进行了优化. |
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| 跨目录配额创建硬链接 | 默认情况下，ext4文件系统中存在约束，不允许跨目录配额创建硬链接. 但在实际中，某些特定场景有创建硬链接的需求，因此Alibaba Cloud Linux 2提供定制接口，该接口能够绕过ext4文件系统中的约束，实现跨目录配额创建硬链接. |
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| 追踪IO时延 | Alibaba Cloud Linux 2优化了IO时延分析工具iostat的原始数据来源/proc/diskstats接口，增加了对设备侧的读、写及特殊IO(discard)等耗时的统计，此外还提供了一个方便追踪IO时延的工具bcc. |
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| 检测文件系统和块层的IO hang | IO hang是指在系统运行过程中，因某些IO耗时过长而引起的系统不稳定甚至宕机. 为了准确检测出IO hang，Alibaba Cloud Linux 2扩展核心数据结构，增加了在较小的系统开销下，快速定位并检测IO hang的功能. |
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| Memcg全局最低水位线分级 | Alibaba Cloud Linux 2新增了memcg全局最低水位线分级功能. 在global wmark_min的基础上，将资源消耗型任务的global wmark_min上移，使其提前进入直接内存回收. 将时延敏感型业务的global wmark_min下移，使其尽量避免直接内存回收. 这样当资源消耗型任务瞬间申请大量内存的时候，会通过上移的global wmark_min将其短时间抑制，避免时延敏感型业务发生直接内存回收. 等待全局kswapd回收一定量的内存后，再解除资源消耗型任务的短时间抑制. |
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| Memcg后台异步回收 | Alibaba Cloud Linux 2增加了memcg粒度的后台异步回收功能. 该功能的实现不同于全局kswapd内核线程的实现，并没有创建对应的memcg kswapd内核线程，而是采用了workqueue机制来实现. |
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| cgroup v1接口支持memcg QoS功能 | 内存子系统服务质量(memcg QoS)可以用来控制内存子系统(memcg)的内存使用量的保证(锁定)与限制. Alibaba Cloud Linux 2在4.19.91-18.al7内核版本，新增cgroup v1接口支持memcg QoS的相关功能. |
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| Memcg Exstat功能 | Alibaba Cloud Linux 2在4.19.91-18.al7内核版本开始支持的Memcg Exstat(Extend/Extra)功能. |
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| TCP-RT功能的配置说明 | Alibaba Cloud Linux 2在内核版本kernel-4.19.91-21.al7开始支持TCP层的服务监控功能(TCP-RT). |
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# 1 SCHED_SLI
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-------
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```cpp
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abd7f977069d alinux: sched: Fix a branch prediction error in static_key
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a66f5804aa67 alinux: sched: Fix compiling error without CONFIG_FAIR_GROUP_SCHED
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252315eb68be alinux: sched: get_sched_lat_count_idx optimization
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b2250b442fa9 alinux: sched: Fix per-cgroup idle accounting deadlock
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ab81d2d9f745 alinux: sched: Add cpu_stress to show system-wide task waiting
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c7462cfec178 alinux: sched: Fix wrong cpuacct_update_latency declaration
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fa418988c52e alinux: sched: Finer grain of sched latency
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2abfd07b1c1a alinux: sched: Add "nr" to sched latency histogram
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6dbaddaa480a alinux: sched: Add cgroup's scheduling latency histograms
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a055ee2ce27b alinux: sched: Add cgroup-level blocked time histograms
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76d98609f832 alinux: sched: Introduce cfs scheduling latency histograms
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bcaf8afd6270 alinux: sched: Add switch for scheduler_tick load tracking
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bb48b716f496 alinux: sched: Add switch for update_blocked_averages
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1c5ab7a7f5d9 alinux: sched: Fix %steal in cpuacct.proc_stat in guest OS
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1607a4855848 alinux: sched: Fix regression caused by nr_uninterruptible
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1e0cec0b58c7 alinux: sched: make SCHED_SLI dependent on FAIR_GROUP_SCHED
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5be663e3cfcf alinux: sched: Fix p->cpu build error on aarch64
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435d7069244d alinux: sched: Fix nr_migrations compile errors
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9e7b35d6d84e alinux: sched: Introduce per-cgroup iowait accounting
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c75529800bf2 alinux: sched: Introduce per-cgroup steal accounting
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61e5885959be alinux: sched: Introduce per-cgroup idle accounting
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004b3ba9ebd3 alinux: sched/cputime: Fix guest cputime of cpuacct.proc_stat
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36da4fe9851a alinux: sched: Maintain "nr_uninterruptible" in runqueue
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06d7286d7c8e alinux: sched: add kconfig SCHED_SLI
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```
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@@ -944,11 +944,13 @@ PageCacheLimit
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Cgroup-Aware OOM killer
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https://lwn.net/Articles/317814
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https://lwn.net/Articles/761118
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| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
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|:----:|:----:|:---:|:----:|:---------:|:----:|
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| 2017/03/17 | Roman Gushchin <guro@fb.com> | [add support for reclaiming priorities per mem cgroup](https://lore.kernel.org/patchwork/cover/771278) | 设置 CGROUP 的内存优先级, Kswapd 等优先扫描低优先级 CGROUP 来回收内存. 用于优化 Android 上的内存回收和 OOM 等机制 | v13 ☐ | [PatchWork v7](https://lore.kernel.org/patchwork/cover/771278), [LKML](https://lkml.org/lkml/2017/3/17/658) |
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| 2017/09/04 | Tim Murray <timmurray@google.com> | [cgroup-aware OOM killer](https://lore.kernel.org/patchwork/cover/828043) | Cgroup 感知的 OOM, 通过优先级限定 OOM 时杀进程的次序 | v13 ☐ | [PatchWork v7](https://lore.kernel.org/patchwork/cover/828043) 带 oom_priority<br>*-*-*-*-*-*-*-* <br>[PatchWork v13](https://lore.kernel.org/patchwork/cover/828043) |
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| 2018/03/16 | David Rientjes <rientjes@google.com> | [rewrite cgroup aware oom killer for general use](https://lore.kernel.org/patchwork/cover/828043) | Cgroup 感知的 OOM, 通过优先级限定 OOM 时杀进程的次序 | v13 ☐ | [PatchWork v1](https://lore.kernel.org/patchwork/cover/934536) |
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| 2021/04/14 | Yulei Zhang <yuleixzhang@tencent.com> | [introduce new attribute "priority" to control group](https://lore.kernel.org/patchwork/cover/828043) | Cgroup 感知的 OOM, 通过优先级限定 OOM 时杀进程的次序 | v13 ☐ | [PatchWork v1](https://lwn.net/Articles/851649)<br>*-*-*-*-*-*-*-* <br>[LWN](https://lwn.net/Articles/852378/) |
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| 2021/03/25 | Ybrookxu | [bfq: introduce bfq.ioprio for cgroup](https://lore.kernel.org/patchwork/cover/828043) | Cgroup 感知的 bfq.ioprio | v3 ☐ | [LKML](https://lkml.org/lkml/2021/3/25/93) |
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