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study/arch/MicroArchitecture/README.md
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---
title: SMT
date: 2021-06-26 09:40
author: gatieme
tags:
- linux
- tools
categories:
- 技术积累
thumbnail:
blogexcerpt: 虚拟化 & KVM 子系统
---
<br>
本作品采用<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议</a>进行许可, 转载请注明出处, 谢谢合作
<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="知识共享许可协议" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a>
因本人技术水平和知识面有限, 内容如有纰漏或者需要修正的地方, 欢迎大家指正, 鄙人在此谢谢啦
**转载请务必注明出处, 谢谢, 不胜感激**
<br>
| 日期 | 作者 | GitHub| CSDN | BLOG |
| ------- |:-------:|:-------:|:-------:|:-------:|
| 2022/01/03 | [成坚-gatieme](https://kernel.blog.csdn.net) | [`AderXCoding/system/tools/fzf`](https://github.com/gatieme/AderXCoding/tree/master/system/tools/fzf) | [AMP 异构多核系统研究](https://blog.csdn.net/gatieme/article/details/113828826) | [Using FZF to Improve Productivit](https://oskernellab.com/2021/02/15/2021/0215-0001-Using_FZF_to_Improve_Productivity)|
<br>
# 1 Rentable Units
-------
英特尔近日申请了一项新的技术专利 [METHODS AND APPARATUS TO SCHEDULE PARALLEL INSTRUCTIONS USING HYBRID CORES - Intel Corporation (freepatentsonline.com)](https://www.freepatentsonline.com/y2023/0168898.html), 介绍了跨混合架构的并行调度方案, 正式确认了 "Rentable Unit" 方案. 这项技术作为一个超线程 SMT 技术的继任者叫作, 相比较传统同步多线程(SMT)技术, 灵活性和可行性更高.
| 编号 | 资料 | 描述 |
|:---:|:----:|:---:|
| 1 | [Intel 多线程秘密武器: 详解「Rentable Units」](https://mp.weixin.qq.com/s/sR9aKrkAlDTWLWVV7bJWxg) | 头发实验室公众号, 介绍 "Rentable Units" |
| 2 | [英特尔专利曝光超线程技术继任者, 更灵活调度、高效处理任务](https://ngabbs.com/read.php?&tid=37385627) | 精英玩家俱乐部论坛对 "Rentable Units" 的介绍 |
| 3 | [Intel 17th Gen CPUs to Get Rentable Units: Why Hyper-Threading is Going Away](https://www.hardwaretimes.com/intel-15th-gen-cpus-to-get-rentable-units-why-hyper-threading-is-going-away) | 介绍了 SMT 以及 "Rentable Unit" 的基本原理. |
| 4 | [Intel Patent Reveals the ‘Rentable Unit’, Marking the End for Hyperthreading](https://appuals.com/intel-rentable-unit-patent) | 简单分析了下 "Rentable Unit" 的基本原理. |
英特尔在 Alder Lake(第 12 代) 处理器上, 采用了大小核 (性能 + 效率) 的混合架构设计, 通过动态算法, 将复杂的任务交由性能核心 (P 核) 处理, 后台任务交由效率 (E 核) 处理. P 核启用了 SMT, 物理内核即使具有 2 个逻辑线程, 1 次也仅能执行 1 条指令, 无法并行工作. 英特尔为了克服并行性问题, 引入了 E 核, 而 "Rentable Unit" 就是超线程技术的继任者.
"Rentable Unit" 工作原理如下:
Rentable Unit 接收指令, 并根据指令的复杂性、可用资源和 CPU 结构对其进行划分.
Rentable Unit 根据任务调度 P 核和 E 核, 确保所有核心都处于活跃状态.
该原理就是确保没有核心处于闲置状态, 如果 P 核处于闲置状态下, 也可以处理 E 核的任务.
它会尝试预测任务在 P/E 核上的完成时间然后试图分割任务以更小粒度跨核调度, 调度会更复杂, 上下文切换会更多, 优化目标可能会倾向吞吐量所以 P 核上高优任务延迟可能会被影响: P 核高优任务可能分一部分扔去 E 核, 而 E 核低优任务可能分一部分拿来 P 核跑.
<br>
* 本作品/博文 ( [AderStep-紫夜阑珊-青伶巷草 Copyright ©2013-2017](http://blog.csdn.net/gatieme) ), 由 [成坚(gatieme)](http://blog.csdn.net/gatieme) 创作.
* 采用<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="知识共享许可协议" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议</a>进行许可. 欢迎转载、使用、重新发布, 但务必保留文章署名[成坚gatieme](http://blog.csdn.net/gatieme) ( 包含链接: http://blog.csdn.net/gatieme ), 不得用于商业目的.
* 基于本文修改后的作品务必以相同的许可发布. 如有任何疑问, 请与我联系.
* **转载请务必注明出处, 谢谢, 不胜感激**
<br>
study/kernel/00-DESCRIPTION/ARCH.md
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@@ -135,6 +135,7 @@ v5.7 引入了拆分锁检测的支持, 这依赖于 x86_64 intel CPU 遇到拆
|:---:|:----:|:---:|:----:|:---------:|:----:|
| 2022/10/06 | Xin Li <xin3.li@intel.com> | [Enable LKGS instruction](https://lore.kernel.org/all/20221006154041.13001-1-xin3.li@intel.com) | [Intel Preps The Linux Kernel For LKGS - Part Of FRED](https://www.phoronix.com/news/Intel-LKGS-Linux-Patches) | v1 ☐☑✓ | [LORE v1,0/6](https://lore.kernel.org/all/20221006154041.13001-1-xin3.li@intel.com) |
| 2022/12/19 | Xin Li <xin3.li@intel.com> | [x86: enable FRED for x86-64](https://lore.kernel.org/all/20221220063658.19271-1-xin3.li@intel.com) | [Intel Sends Out Initial Linux Kernel Patches For FRED](https://www.phoronix.com/news/Intel-FRED-Linux-Patches) 和 [Intel FRED Merged For Linux 6.9 As An Important Improvement With Future CPUs](https://www.phoronix.com/news/Intel-FRED-Merged-Linux-6.9). | v1 ☐☑✓ | [LORE v1,0/32](https://lore.kernel.org/all/20221220063658.19271-1-xin3.li@intel.com)<br>*-*-*-*-*-*-*-* <br>[LORE v13,0/35](https://lore.kernel.org/all/20231205105030.8698-1-xin3.li@intel.com) |
| 2024/05/29 | Jacob Pan <jacob.jun.pan@linux.intel.com> | [Add support for NMI source reporting](https://lore.kernel.org/all/20240529203325.3039243-1-jacob.jun.pan@linux.intel.com) | 参见 phoronix 报道 [Intel Improving NMI Source Reporting On Linux With FRED](https://www.phoronix.com/news/Intel-Linux-NMI-Source-Report). | v1 ☐☑✓ | [LORE v1,0/6](https://lore.kernel.org/all/20240529203325.3039243-1-jacob.jun.pan@linux.intel.com) |
@@ -238,7 +239,7 @@ ASYM_PACKING 用于平衡物理核心与 SMT 之间的负载均衡处理 (例如
| 2022/08/25 | Ricardo Neri <ricardo.neri-calderon@linux.intel.com> | [sched/fair: Avoid unnecessary migrations within SMT domains](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?id=046a5a95c3b0425cfe79e43021d8ee90c1c4f8c9) | 参见 phoronix 报道 [Linux 6.5 To Boast Improved Handling For Intel Hybrid CPUs With Hyper Threading](https://www.phoronix.com/news/Linux-6.4-Avoid-Unnecessary-SMT). | v1 ☐☑✓ | [2022/08/25 LORE v1,0/4](https://lore.kernel.org/all/20220825225529.26465-1-ricardo.neri-calderon@linux.intel.com)<br>*-*-*-*-*-*-*-* <br>[2022/11/22 LORE v2,0/7](https://lore.kernel.org/lkml/20221122203532.15013-1-ricardo.neri-calderon@linux.intel.com)<br>*-*-*-*-*-*-*-* <br>[2023/02/07 LORE v3,0/10](https://lore.kernel.org/all/20230207045838.11243-1-ricardo.neri-calderon@linux.intel.com) |
#### 1.4.1.3 Intel Thread Director (ITD)
#### 1.4.1.4 Intel Thread Director (ITD)
-------
[Intel 支持混合内核架构的硬件线程调度器是怎么工作的？](https://mp.weixin.qq.com/s/9Zl-h61hm0kDhq68bsBEJQ)
@@ -254,7 +255,8 @@ ASYM_PACKING 用于平衡物理核心与 SMT 之间的负载均衡处理 (例如
随后发布了 v2, 参见 phoronix 报道 [Intel Advances Linux"IPC Classes"Design To Improve Load Balancing For Hybrid CPUs](https://www.phoronix.com/news/Intel-IPC-Classes-Post-RFC).
* 混合拓扑结构支持
##### 1.4.1.4.1 Hardware Feedback Interface 支持
-------
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:----:|:---------:|:----:|
@@ -262,7 +264,6 @@ ASYM_PACKING 用于平衡物理核心与 SMT 之间的负载均衡处理 (例如
| 2022/09/09 | Ricardo Neri <ricardo.neri-calderon@linux.intel.com> | [sched: Introduce classes of tasks for load balance](https://lore.kernel.org/all/20220909231205.14009-1-ricardo.neri-calderon@linux.intel.com) | 实现 Thread-Director, 根据应用程序的类型 classes 实现选核和负载均衡. | v1 ☐☑✓ | [LORE v1,00/23](https://lore.kernel.org/all/20220909231205.14009-1-ricardo.neri-calderon@linux.intel.com)<br>*-*-*-*-*-*-*-* <br>[LORE v2,00/22](https://lore.kernel.org/all/20221128132100.30253-1-ricardo.neri-calderon@linux.intel.com)<br>*-*-*-*-*-*-*-* <br>[LORE v3,0/24](https://lore.kernel.org/all/20230207051105.11575-1-ricardo.neri-calderon@linux.intel.com)<br>*-*-*-*-*-*-*-* <br>[LORE v4,00/24](https://lore.kernel.org/all/20230613042422.5344-1-ricardo.neri-calderon@linux.intel.com) |
| 2024/01/31 | Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> | [thermal/netlink/intel_hfi: Enable HFI feature only when required](https://lore.kernel.org/all/20240131120535.933424-1-stanislaw.gruszka@linux.intel.com) | 该补丁集仅在有用户空间实体侦听热网络链接事件时才启用 HFI. 引入了一个 netlink 通知, 它与 netlink_has_listners()检查一起, 允许驱动程序根据实际用户空间消费者的存在发送 netlink 多播事件. 此功能通过允许在不需要时禁用功能来优化资源使用. 然后在 intel_hif 驱动程序中实现通知机制, 用于动态禁用硬件反馈接口 (HFI). 通过实现 netlink 通知回调, 驱动程序现在可以根据实际需求启用或禁用 HFI, 特别是当用户空间应用程序(如英特尔速度选择或英特尔低功耗守护进程) 利用与性能和能效功能相关的事件时. 在有 Intel HFI 但没有安装用户空间组件的机器上, 我们可以节省大量的 CPU 周期. | v1 ☐☑✓ | [LORE v1,0/3](https://lore.kernel.org/all/20240131120535.933424-1-stanislaw.gruszka@linux.intel.com) |
| 2024/02/02 | Ricardo Neri <ricardo.neri-calderon@linux.intel.com> | [thermal: intel: hfi: Prework for the virtualization of HFI](https://lore.kernel.org/all/20240203040515.23947-1-ricardo.neri-calderon@linux.intel.com) | 用于 [支持 IPC 类任务的调度](https://lore.kernel.org/all/20230613042422.5344-1-ricardo.neri-calderon@linux.intel.com) 的基础 <br>1. 重新组织 HFI 驱动程序的部分, 以便于实现虚拟 HFI 表.<br>2. 引入了 ITD 类的概念并启用了 ITD.<br>3. 增加了对重置当前任务的 ITD 分类历史的支持, 以便在上下文切换期间使用. HFI 的虚拟化要求在系统中无条件启用 HFI 和 ITD. 这与 Stanislaw 的补丁集 [thermal/netlink/intel_hfi: Enable HFI feature only when required](https://lore.kernel.org/all/20240131120535.933424-1-stanislaw.gruszka@linux.intel.com) 存在冲突. | v1 ☐☑✓ | [LORE v1,0/9](https://lore.kernel.org/all/20240203040515.23947-1-ricardo.neri-calderon@linux.intel.com) |
| 2024/02/03 | Zhao Liu <zhao1.liu@linux.intel.com> | [Intel Thread Director Virtualization](https://lore.kernel.org/all/20240203091214.411862-1-zhao1.liu@linux.intel.com) | 以虚拟化硬件反馈接口 (HFI) 和英特尔线程控制器(ITD), 从而为使用 ITD 进行调度的虚拟机带来好处. 他的实验表明, 在某些工作负载和配置中, 性能提高了 14%. [Intel Thread Director Virtualization Patches Boost Some Workloads By ~14%](https://www.phoronix.com/news/Intel-Thread-Director-Virt) | v1 ☐☑✓ | [LORE v1,0/26](https://lore.kernel.org/all/20240203091214.411862-1-zhao1.liu@linux.intel.com)|
| 2024/02/23 | Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> | [thermal/netlink/intel_hfi: Enable HFI feature only when required](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?id=b33f3d2677b8ddd7a3aba2b02497422a1d2c2a01) | 英特尔 HFI 驱动程序可以在需要时启用它, 从而"节省大量 CPU 周期". 仅在有用户空间使用者处于活动状态时启用它. 如果英特尔 Speed Select 或英特尔低功耗守护程序正在运行, 英特尔 HFI 接口将被激活, 但如果不是, 它将被禁用, 从而显然可以节省大量 CPU 资源. 参见 phoronix 报道 [英特尔 HFI 驱动程序可以“节省大量 CPU 周期”，只需在需要时才启用自身](https://www.phoronix.com/news/Intel-HFI-Enable-Disable) 以及 [](https://www.phoronix.com/news/Intel-HFI-Efficient-Linux-6.10) | v4 ☐☑✓ v6.10-rc1 | [LORE v4,0/3](https://lore.kernel.org/all/20240223155942.60813-1-stanislaw.gruszka@linux.intel.com) |
@@ -284,14 +285,38 @@ hfi_update_work_fn
```
#### 1.4.1.2 编译器支持
##### 1.4.1.4.2 Intel Thread Director (ITD) 支持
-------
为了更好的发挥这种混合架构的优势, Intel 提供了一项名为 [Thread Director 的技术](https://www.anandtech.com/show/16881/a-deep-dive-into-intels-alder-lake-microarchitectures/2), 专利分析 [The Alder Lake hardware scheduler – A brief overview](https://coreteks.tech/articles/index.php/2021/07/02/the-alder-lake-hardware-scheduler-a-brief-overview/)
1. 首席按通过机器学习算法对进程在 P-core/E-core 的性能和功耗进行分析和建模, 识别进程特征, 从而可以预测出不同类型进程或者进程某段时期在 P/E core 上的能效关系.
2. 硬件将进程的运行能效换算后, 直接填写到内存中. 当进程在 P/E core 上运行时负责某种规则时(比如进程行为特征发生变化, 即能效发生变化), 直接通知 OS/Kernel 调度器进行决策, 以达到最好的能效.
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:----:|:---------:|:----:|
| 2024/02/03 | Zhao Liu <zhao1.liu@linux.intel.com> | [Intel Thread Director Virtualization](https://lore.kernel.org/all/20240203091214.411862-1-zhao1.liu@linux.intel.com) | 以虚拟化硬件反馈接口 (HFI) 和英特尔线程控制器(ITD), 从而为使用 ITD 进行调度的虚拟机带来好处. 他的实验表明, 在某些工作负载和配置中, 性能提高了 14%. [Intel Thread Director Virtualization Patches Boost Some Workloads By ~14%](https://www.phoronix.com/news/Intel-Thread-Director-Virt) | v1 ☐☑✓ | [LORE v1,0/26](https://lore.kernel.org/all/20240203091214.411862-1-zhao1.liu@linux.intel.com)|
##### 1.4.1.4.3 Intel Low Power Mode Daemon(LPMD) 支持
-------
英特尔低功耗模式守护程序 LPMD, 用于优化 Linux 下现代酷睿混合 CPU 的主动空闲电源, 这些 CPU 具有 E 和 P 内核的组合. Intel LPMD 支持多种低功耗状态, 可以根据 EPP/EPB/ITMT 设置、IRQ 迁移和任务迁移定义多种状态. 还可以根据不同的利用率阈值选择不同的低功耗状态. 根据检测到的 CPU 拓扑或用户配置文件选择最节能的 CPU. 根据系统利用率等信息, 将在适用时将系统置于低功耗模式, 比如使用最节能的 E 核, 并在不需要时禁用 P 的内核.
2024/06/12 LPMD 发布 0.0.4, 增强了其硬件反馈接口(HFI)监视器, 支持对来自被禁止的 CPU 的提示进行 HFI 监视, 支持多种低功耗状态, 支持工作负载类型提示, 并支持在低功耗模式转换期间更改能效偏好(EPP). 参见 )
报道 [Intel Low Power Mode Daemon v0.0.4 Released To Optimize Hybrid CPUs On Linux](https://www.phoronix.com/news/Intel-LPMD-Low-Power-0.0.4).
#### 1.4.1.5 编译器支持
-------
[Intel Updates Alder Lake Tuning For GCC, Reaffirms No Official AVX-512](https://www.phoronix.com/scan.php?page=news_item&px=Intel-Alder-Lake-Tuning-GCC)
#### 1.4.1.3 性能评测
#### 1.4.1.6 性能评测
-------
[Intel Core I9-12900K VS I5-12600K](https://openbenchmarking.org/vs/Processor/Intel%20Core%20i5-12600K,Intel%20Core%20i9-12900K)
@@ -308,14 +333,7 @@ Intel Alder Lake CPU 支持 AVX 512
[An Important Note On The Alder Lake Mobile Power/Performance With Linux 5.19](https://www.phoronix.com/scan.php?page=article&item=linux-519-alderlakep) 针对 AdlerLake 笔记本测试了 v5.18 和 v5.19 电源管理等带来的能效差异.
#### 1.4.1.4 调度器优化
-------
为了更好的发挥这种混合架构的优势, Intel 提供了一项名为 [Thread Director 的技术](https://www.anandtech.com/show/16881/a-deep-dive-into-intels-alder-lake-microarchitectures/2), 专利分析 [The Alder Lake hardware scheduler – A brief overview](https://coreteks.tech/articles/index.php/2021/07/02/the-alder-lake-hardware-scheduler-a-brief-overview/)
1. 首席按通过机器学习算法对进程在 P-core/E-core 的性能和功耗进行分析和建模, 识别进程特征, 从而可以预测出不同类型进程或者进程某段时期在 P/E core 上的能效关系.
2. 硬件将进程的运行能效换算后, 直接填写到内存中. 当进程在 P/E core 上运行时负责某种规则时(比如进程行为特征发生变化, 即能效发生变化), 直接通知 OS/Kernel 调度器进行决策, 以达到最好的能效.
### 1.4.2 AMD's version of big.LITTLE
-------
@@ -334,7 +352,7 @@ AMD 关于大小核的专利 [US20210173715A1: METHOD OF TASK TRANSITION BETWEEN
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:---:|:----:|:---:|:----:|:---------:|:----:|
| 2024/05/07 | Perry Yuan <perry.yuan@amd.com> | [AMD Pstate Driver Fixes and Improvements](https://lore.kernel.org/all/cover.1715065568.git.perry.yuan@amd.com) | 参见 phoronix 报道 [AMD Posts Patches For Improving Heterogeneous Core Type CPUs On Linux](https://www.phoronix.com/news/AMD-Heterogeneous-P-State-Linux). | v1 ☐☑✓ | [LORE v1,0/11](https://lore.kernel.org/all/cover.1715065568.git.perry.yuan@amd.com) |
| 2024/05/07 | Perry Yuan <perry.yuan@amd.com> | [AMD Pstate Driver Fixes and Improvements](https://lore.kernel.org/all/cover.1715065568.git.perry.yuan@amd.com) | 参见 phoronix 报道 [AMD Posts Patches For Improving Heterogeneous Core Type CPUs On Linux](https://www.phoronix.com/news/AMD-Heterogeneous-P-State-Linux) 和 [AMD P-State Linux Patches Updated For Heterogeneous CPUs](https://www.phoronix.com/news/AMD-P-State-Hetero-v3). | v1 ☐☑✓ | [2024/05/07, LORE v1,0/11](https://lore.kernel.org/all/cover.1715065568.git.perry.yuan@amd.com)<br>*-*-*-*-*-*-*-* <br>[2024/06/11, LORE v3,0/10](https://lore.kernel.org/all/cover.1718095377.git.perry.yuan@amd.com) |
### 1.4.3 ARM big.LITTLE & DynamIQ
-------
@@ -821,8 +839,7 @@ ARM v8.2 引入了 [UAO](https://community.arm.com/arm-community-blogs/b/archite
|:-----:|:----:|:----:|:----:|:------------:|:----:|
| 2022/05/04 | Hector Martin <marcan@marcan.st> | [Apple SoC cpufreq driver](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20220504075153.185208-1-marcan@marcan.st/) | 638189 | v2 ☐☑ | [LORE v2,0/4](https://lore.kernel.org/r/20220504075153.185208-1-marcan@marcan.st) |
Apple Silicon 不支持像插入 U 盘并重新启动到 Linux 安装程序这样简单的事情. 想要在 M1 或更高版本的 Mac 上安装 Linux 的用户必须在 macOS 中开始安装, 调整磁盘大小以便有空间容纳 Asahi, 然后重新启动到 macOS 恢复 (recoveryOS) 以完成安装. Asahi Linux 通常与 macOS 一起安装, 因此用户可以选择启动到任一操作系统, 但用户可以完全摆脱 macOS 分区. 作为该过程的一部分, Asahi 将用于系统恢复的 macOS 内核替换为 Asahi 的 m1n1 引导加载程序, 用于 Apple 硬件. 这意味着安装程序(用 Python 编写)需要两个 macOS 二进制文件来执行安装: macOS 的 Python 解释器和 libffi, recoveryOS 中的 Python 使用它从 macOS 内核中提取固件供 Linux 使用. 不幸的是, 它需要 Xcode 为 macOS 构建这些二进制文件, 因此不可能在 Linux 上构建二进制文件, 这意味着要发布预构建的二进制文件. 这方面 Fedora 已经批准了这些二进制程序的构建于发布. 参见 [LWN, 2024/05/29, FESCo-2024, Fedora approves shipping pre-built macOS binaries](https://lwn.net/Articles/975445).
## 2.8 clocksource
-------
@@ -1085,7 +1102,7 @@ https://blogs.vmware.com/vsphere/2021/10/introducing-project-capitola.html
| 2018/07/16 | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | [Updates to the formal memory model](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?id=71b7ff5ebc9b1d5aa95eb48d6388234f1304fd19) | NA | v1 ☑✓ 4.19-rc1 | [LORE v1,0/14](https://lore.kernel.org/all/20180716180540.GA14222@linux.vnet.ibm.com) |
### 6.5.3 内存一致性问题(memory consistency)
### 6.5.2 内存一致性问题(memory consistency)
-------
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
@@ -1093,6 +1110,21 @@ https://blogs.vmware.com/vsphere/2021/10/introducing-project-capitola.html
| 2024/04/10 | Zayd Qumsieh <zayd_qumsieh@apple.com> | [tso: aarch64: Expose TSO for virtualized linux on Apple Silicon](https://lore.kernel.org/all/20240410211652.16640-1-zayd_qumsieh@apple.com) | x86 CPU 使用 TSO 内存模型. Apple Silicon CPU 能够选择性地使用 TSO 内存模型. 这可以通过设置 ACTLR 来完成. TSOEN 位为 1. 此功能对 x86 仿真器非常有用, 因为它消除了仿真器插入内存屏障以遵守的需要. 通过 TSO 存储器模型. 此补丁系列将添加 ACTLR. TSOEN 支持 Apple Silicon 机器上的虚拟化 linux. 用户空间将能够使用 prctl 将 CPU 的内存模型从默认的 ARM64 内存模型更改为 TSO 内存模型. 可以使用一个简单的测试来确定 TSO 内存模型是否正在使用中. 这必须在 Apple Silicon MacOS Sonoma 14.4 版或更高版本上完成, 因为早期版本不支持修改 TSOEN 位. 用例程序参见 [TSOEnabler](https://github.com/saagarjha/TSOEnabler/blob/master/testtso/main.c), 如果 TSO 正在使用, 此程序将无限期挂起, 如果不使用, 则几乎立即崩溃. 参见 LWN 报道 [Support for the TSO memory model on Arm CPUs](https://lwn.net/Articles/970907) | v1 ☐☑✓ | [LORE v1,0/3](https://lore.kernel.org/all/20240410211652.16640-1-zayd_qumsieh@apple.com) |
### 6.5.3 Concurrent Code Verification
-------
| 编号 | 作者 | 工具 | 描述 | 链接 |
|:---:|:-----:|:----:|:---:|:----:
| 1 | paulmckrcu | [litmus](https://github.com/paulmckrcu/litmus) | Automatically generated litmus tests for validation LISA-language Linux-kernel memory models | [github/paulmckrcu/litmus](https://github.com/paulmckrcu/litmus) |
| 2 | herd | [herd/herdtools7](https://github.com/herd/herdtools7) | 一个用于测试弱内存模型的工具套件. HERD7: 用于弱内存模型的通用模拟器, litmus7: 运行 litmus 测试(作为 Power、ARM、AArch64 或 X86 的汇编程序提供)来测试执行机器的内存模型, DIY7: 根据简明规范制作石蕊测试 | [官网](http://diy.inria.fr) |
| 3 | Hernan Ponce de Leon 等 | [Dat3M](https://github.com/hernanponcedeleon/Dat3M) | Memory Model Aware Verification, Dartagnan is a tool to check state reachability under weak memory models. | [github/hernanponcedeleon/Dat3M](https://github.com/hernanponcedeleon/Dat3M) |
| 4 | MPI-SWS(Max Planck Institute for Software Systems) | [GenMC](https://github.com/MPI-SWS/genmc) | A Model Checker for Weak Memory Models | [官网](https://plv.mpi-sws.org/genmc), [论文引用详情](https://ouci.dntb.gov.ua/en/works/4ryroeM7), [github/MPI-SWS/genmc](https://github.com/MPI-SWS/genmc) |
| 5 | MPI-SWS(Max Planck Institute for Software Systems) | [Kater](https://github.com/MPI-SWS/kater) | Automating Weak Memory Model Metatheory and Consistency Checking | [MPI-SWS/kater](https://github.com/MPI-SWS/kater) |
| 6 | NVlabs | [NVlabs/mixedproxy](https://github.com/NVlabs/mixedproxy) | Mixed-Proxy Extensions for the NVIDIA PTX Memory Consistency Model | [NVlabs/mixedproxy](https://github.com/NVlabs/mixedproxy) |
| 7 | [Open, Safe and Scalable System Software Concurrency](https://github.com/open-s4c) | [vsyncer](https://github.com/open-s4c/vsyncer) | vsyncer: is a toolkit to verify and optimize concurrent C/C++ programs on WMMs, which employs state-of-the-art model checkers Dartagnan and GenMC. | [open-s4c](https://github.com/open-s4c) |
## 6.6 objtool
-------
@@ -1105,11 +1137,18 @@ https://blogs.vmware.com/vsphere/2021/10/introducing-project-capitola.html
## 6.7 指令转译
-------
### 6.7.1 Apple Rosetta
-------
Rosetta 是一个转译过程, 允许用户在 Apple Silicon 上运行包含 x86_64 指令的应用程序. 在 macOS 中, 这允许为基于英特尔的 Mac 电脑构建的应用程序在 Apple Silicon 上无缝运行; Rosetta 可以在 ARM Linux 虚拟机中为英特尔 Linux 应用程序提供同样的功能.
[macOS 13 Adding Ability To Use Rosetta In ARM Linux VMs For Speedy x86_64 Linux Binaries](https://www.phoronix.com/scan.php?page=news_item&px=macOS-13-Rosetta-Linux-Binaries)
### 6.7.2 FEX 2406
-------
FEX 是在 ARM64/AArch64 Linux 上开发用户模式 x86/x86_64 二进制仿真的开源项目之一. FEX 2406 于 2024/6/13 发布新版本, 附带了许多[即时 JIT 优化](https://fex-emu.com/FEX-2406)、大大改进的寄存器分配器以及各种其他性能优化, 带来了 2% 到 12% 的性能提升. FEX 2406 还增加了对 32 位 OpenGL thunking 的支持, 作为提高其 x86 32 位游戏/应用程序兼容性的一部分. [FEX 2406 Brings JIT Optimizations For Running x86_64 Binaries On AArch64](https://www.phoronix.com/news/FEX-2406-Released).
@@ -1221,7 +1260,7 @@ openEuler 提供了 [openEuler/prefetch_tuning](https://gitee.com/openeuler/pref
| 2022/03/25 | Mario Limonciello <mario.limonciello@amd.com> | [Improve usability for amd-pstate](https://lore.kernel.org/all/20220325054228.5247-1-mario.limonciello@amd.com) | TODO | v1 ☐☑✓ | [LORE v1,0/3](https://lore.kernel.org/all/20220325054228.5247-1-mario.limonciello@amd.com)<br>*-*-*-*-*-*-*-* <br>[LORE v3,0/6](https://lore.kernel.org/linux-pm/20220414164801.1051-1-mario.limonciello@amd.com) |
| 2023/01/13 | Wyes Karny <wyes.karny@amd.com> | [amd_pstate: Add guided autonomous mode support](https://lore.kernel.org/all/20230113052141.2874296-1-wyes.karny@amd.com) | [AMD Updates P-State"Guided Autonomous Mode"Support For Linux](https://www.phoronix.com/news/AMD-Guided-Auto-Mode-v2) | v2 ☐☑✓ | [LORE v2,0/6](https://lore.kernel.org/all/20230113052141.2874296-1-wyes.karny@amd.com) |
| 2024/01/30 | Perry Yuan <perry.yuan@amd.com> | [enable x86_energy_perf_policy for AMD CPU](https://lore.kernel.org/all/cover.1706583551.git.perry.yuan@amd.com) | 对 AMD 处理器上 x86_energy_perf_policy 实用程序的支持, 这些处理器使用 CPPC(Collaborative Processor Performance Control) 接口进行频率缩放, 并使用 AMD_state 驱动程序模块. AMD 处理器已经支持各种能源性能偏好 EPP(Energy Performance Preference) 配置文件. 有了这个实用程序, 用户现在可以使用提供的命令在这些 EPP 配置文件之间无缝切换. 并使用此工具检查 CPPC 的功能. 此增强旨在提高 AMD 处理器的电源效率和性能管理, 为用户提供对系统能源性能行为的更多控制. 参见 [Linux's x86_energy_perf_policy Utility Being Extended To AMD CPUs](https://www.phoronix.com/news/AMD-x86_energy_perf_policy) | v1 ☐☑✓ | [LORE v1,0/8](https://lore.kernel.org/all/cover.1706583551.git.perry.yuan@amd.com) |
| 2024/04/28 | Xiaojian Du <Xiaojian.Du@amd.com> | [x86/cpufeatures: Add AMD FAST CPPC feature flag](https://lore.kernel.org/all/20240428091133.592333-1-Xiaojian.Du@amd.com) | 一些 AMD Zen 4 处理器支持新功能 FAST CPPC, 由于内部架构增强, 该功能允许更快的 CPPC 循环. 这种更快循环的目标是在相同的功耗下获得更高的性能. 参见 phoronix 报道 [AMD Enabling "Fast CPPC" For Even Greater Linux Performance & Power Efficiency On Some CPUs](https://www.phoronix.com/news/AMD-Fast-CPPC-Linux-Patches). | v1 ☐☑✓ | [LORE v1,0/2](https://lore.kernel.org/all/20240428091133.592333-1-Xiaojian.Du@amd.com) |
| 2024/04/28 | Xiaojian Du <Xiaojian.Du@amd.com> | [x86/cpufeatures: Add AMD FAST CPPC feature flag](https://lore.kernel.org/all/20240428091133.592333-1-Xiaojian.Du@amd.com) | 一些 AMD Zen 4 处理器支持新功能 FAST CPPC, 由于内部架构增强, 该功能允许更快的 CPPC 循环. 这种更快循环的目标是在相同的功耗下获得更高的性能. 参见 phoronix 报道 [AMD Enabling "Fast CPPC" For Even Greater Linux Performance & Power Efficiency On Some CPUs](https://www.phoronix.com/news/AMD-Fast-CPPC-Linux-Patches). | v1 ☐☑✓ | [LORE v1,0/2](https://lore.kernel.org/all/20240428091133.592333-1-Xiaojian.Du@amd.com)<br>*-*-*-*-*-*-*-* <br>[LORE v4,1/2](https://lore.kernel.org/linux-pm/e717feea3df0a178a9951491040a76c79a00556c.1716649578.git.Xiaojian.Du@amd.com) |
#### 6.12.2.2 AMD P-State Preferred Core
@@ -1265,7 +1304,7 @@ AMD-pstate 驱动程序利用 ITMT 体系结构提供的功能和数据结构,
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:---:|:----:|:---:|:----:|:---------:|:----:|
| 2023/08/29 | Tony Luck <tony.luck@intel.com> | [Add support for Sub-NUMA cluster (SNC) systems](https://lore.kernel.org/all/20230829234426.64421-1-tony.luck@intel.com) | [Intel Fixing Up Sub-NUMA Clustering For Linux So That It Behaves With RDT](https://www.phoronix.com/news/Intel-SNT-RDT-Fixing-Up) | v5 ☐☑✓ | [LORE v5,0/8](https://lore.kernel.org/all/20230829234426.64421-1-tony.luck@intel.com) |
| 2023/08/29 | Tony Luck <tony.luck@intel.com> | [Add support for Sub-NUMA cluster (SNC) systems](https://lore.kernel.org/all/20230829234426.64421-1-tony.luck@intel.com) | Add support for Sub-NUMA cluster (SNC) systems](https://lore.kernel.org/all/20240528222006.58283-1-tony.luck@intel.com) | 英特尔推出了一个大型的 Linux 内核补丁系列, 以改进 Sub-NUMA 集群 "SNC" 支持, 使其在现代英特尔硬件上与英特尔资源总监技术(RDT) 配合良好. SNC 将 CPU 内核/缓存/内存拆分为多个 NUMA 域有助于提高 NUMA 感知工作负载的性能. 参见 phoronix 报道 [Intel Fixing Up Sub-NUMA Clustering For Linux So That It Behaves With RDT](https://www.phoronix.com/news/Intel-SNT-RDT-Fixing-Up) 和 | v5 ☐☑✓ | [LORE v5,0/8](https://lore.kernel.org/all/20230829234426.64421-1-tony.luck@intel.com)<br>*-*-*-*-*-*-*-* <br>[LORE v19,0/20](https://lore.kernel.org/all/20240528222006.58283-1-tony.luck@intel.com) |
| 2023/12/07 | Tony Luck <tony.luck@intel.com> | [x86/resctrl: mba_MBps enhancements](https://lore.kernel.org/all/20231207195613.153980-1-tony.luck@intel.com) | TODO | v6 ☐☑✓ | [LORE v6,0/3](https://lore.kernel.org/all/20231207195613.153980-1-tony.luck@intel.com) |
| 2024/02/13 | James Morse <james.morse@arm.com> | [x86/resctrl: monitored closid+rmid together, separate arch/fs locking](https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/log/?id=fb700810d30b9eb333a7bf447012e1158e35c62f) | [Improved Memory Bandwidth Throttling Behavior For Linux 6.9](https://www.phoronix.com/news/Linux-69-RAM-Bandwidth-Throttle) | v9 ☐☑✓ 6.9-rc1 | [LORE v9,0/24](https://lore.kernel.org/all/20240213184438.16675-1-james.morse@arm.com) |
| 2024/03/21 | James Morse <james.morse@arm.com> | [x86/resctrl: Move the resctrl filesystem code to /fs/resctrl](https://lore.kernel.org/all/20240321165106.31602-1-james.morse@arm.com) | TODO | v1 ☐☑✓ | [LORE v1,0/31](https://lore.kernel.org/all/20240321165106.31602-1-james.morse@arm.com) |
study/kernel/00-DESCRIPTION/BPF.md
+17 -1
View File
@@ -73,6 +73,7 @@ blogexcerpt: 虚拟化 & KVM 子系统
[bpftrace Cheat Sheet](https://www.brendangregg.com/BPF/bpftrace-cheat-sheet.html)
[Standardizing BPF](https://lwn.net/Articles/926882)
[Standardizing the BPF ISA](https://lwn.net/Articles/975830)
[摩斯电码博客-eBPF 学习](https://cnblogs.com/pengdonglin137/p/16808698.html)
@@ -89,6 +90,15 @@ blogexcerpt: 虚拟化 & KVM 子系统
## 2.1 编译器
-------
### 2.1.1. LLVM Support eBPF
-------
[LWN, 2024/05/27, LSFMMBPF-2024, LLVM improvements for BPF verification](https://lwn.net/Articles/974945).
### 2.1.2 GCC Support eBPF
-------
自 2019 年 5 月以来, Oracle 一直计划在 GCC 10 中引入 eBPF 后端, 以使 GNU 编译器成为通用内核虚拟机. Oracle 为 GCC 引入 eBPF 支持的倾向是该公司在 Linux 上改进 DTrace 的努力的一部分. 作为编译目标, eBPF 因内核验证器施加的限制而不同, 并且由于架构的安全驱动设计. 目前, 只要违反 eBPF 限制, 后端就会发出错误. 这增加了内核验证器可以接受结果对象的机会, 从而缩短了开发周期. 参见 [](https://www.phoronix.com/scan.php?page=news_item&px=GCC-10-eBPF-Port-Lands).
GCC 的支持 eBPF 经过了 3 个阶段.
@@ -106,12 +116,18 @@ GCC 的支持 eBPF 经过了 3 个阶段.
| 2020/09/25 | [BPF in GCC](https://lwn.net/Articles/831402) | [LWN：GCC 也支持 BPF 了！](https://blog.csdn.net/Linux_Everything/article/details/108806492) |
[GCC-DOC 3.19.14 eBPF Options](https://gcc.gnu.org/onlinedocs/gcc/eBPF-pthttps://lwn.net/Articles/800606/ions.html)
[GCC-DOC 3.19.14 eBPF Options](https://gcc.gnu.org/onlinedocs/gcc/eBPF-ptions.html)
[LWN, 2019/09/17, LPC-2019, Compiling to BPF with GCC](https://lwn.net/Articles/800606)
[LWN, 2023/10/06, 2023 GNU Tools Cauldron, The challenge of compiling for verified architectures](https://lwn.net/Articles/946254)
[LWN, 2024/05/28, LSFMMBPF-2024, Supporting BPF in GCC](https://lwn.net/Articles/975412)
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:----:|:---------:|:----:|
| 2019/08/14 | "Jose E. Marchesi" <jose.marchesi-AT-oracle.com> | [eBPF support for GCC](https://lwn.net/Articles/796317) | GCC 支持 eBPF | v1 ☐ | [LWN](https://lwn.net/Articles/796317/) |
## 2.2 加载器
-------
study/kernel/00-DESCRIPTION/DEBUGGING.md
+5 -11
View File
@@ -75,6 +75,7 @@ blogexcerpt: FZF 是目前最快的模糊搜索工具. 使用 golang 编写. 结
| 2018/11/23 | Shile Zhang <shile.zhang@linux.alibaba.com> | [Speed booting by sorting ORC unwind tables at build time](https://lore.kernel.org/patchwork/cover/1162315) | ORC unwind 有两个表, .orc_unwind_ip 和. orc_unwind 二分搜索需要排序. 在构建时对其进行排序可以节省更多 CPU 周期有助于加快内核引导. 添加 ORC 表排序在一个独立的线程有助于避免更多的链接. | RFC v6 ☐ | [PatchWork v6](https://lore.kernel.org/patchwork/cover/1162315) |
| 2021/08/12 | Shile Zhang <shile.zhang@linux.alibaba.com> | [arm64: Reorganize the unwinder and implement stack trace reliability checks](https://lwn.net/Articles/866194) | 使所有堆栈遍历函数都使用 arch_stack_walk().<br> 目前, ARM64 代码中有多个函数使用 start_backtrace() 和 unwind_frame() 遍历堆栈. 将它们全部转换为使用 arch_stack_walk(). 这使得维护更容易. | RFC v8 ☐ | [PatchWork RFC,v8,0/4](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210812190603.25326-1-madvenka@linux.microsoft.com) |
虽然不省略帧指针对性能有已知的影响, 因此之前各发行版都默认不开启栈帧, 但是 2022 年各大发行版, Fedora/Ubuntu 24.04 LTS 等均启用了帧指针以实现更好的调试/分析. 为了两全其美, 2024 年 Red Hat 开发 eu-stracktrace 作为一种新的分析方法, 而无需依赖帧指针. 参见 phoronix 报道 [phoronix, 2024/06/11, Red Hat Developing "eu-stacktrace" For Profiling Without Frame Pointers](https://www.phoronix.com/news/Red-Hat-eu-stacktrace), [redhat 博客--Get system-wide profiles of binaries without frame pointers](https://developers.redhat.com/articles/2024/06/11/get-system-wide-profiles-binaries-without-frame-pointers#), 以及 [elfutils, eu-stacktrace development branch](https://sourceware.org/cgit/elfutils/tree/README.eu-stacktrace?h=users/serhei/eu-stacktrace).
# 2 unikernel
-------
@@ -324,14 +325,7 @@ $reclaim = current\_mem \times reclaim\_ratio \times max(0,1 – \frac{psi_some}
| 2022/02/07 | John Ogness <john.ogness@linutronix.de> | [implement threaded console printing](https://lore.kernel.org/all/20220207194323.273637-1-john.ogness@linutronix.de) | 参见 phoronix 报道 [Linux Gets Patches For Threaded Console Printing](https://www.phoronix.com/scan.php?page=news_item&px=Linux-Threaded-Console-Print) 和 [Patches Updated For Linux To Enjoy Consoles Running At Full-Speed](https://www.phoronix.com/scan.php?page=news_item&px=Printk-v3-Consoles-Full-Speed) | v1 ☐ | [LORE v1,0/13](https://lore.kernel.org/all/20220207194323.273637-1-john.ogness@linutronix.de) |
| 2023/03/02 | John Ogness <john.ogness@linutronix.de> | [threaded/atomic console support](https://lore.kernel.org/all/87wn3zsz5x.fsf@jogness.linutronix.de) | TODO | v1 ☐☑✓ | [LORE v1,0/18](https://lore.kernel.org/all/87wn3zsz5x.fsf@jogness.linutronix.de) |
| 2024/02/18 | John Ogness <john.ogness@linutronix.de> | [wire up write_atomic() printing](https://lore.kernel.org/all/20240218185726.1994771-1-john.ogness@linutronix.de) | TODO | v2 ☐☑✓ | [LORE v2,0/26](https://lore.kernel.org/all/20240218185726.1994771-1-john.ogness@linutronix.de) |
## 9.3 A new approach printk
-------
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:----:|:---------:|:----:|
| 2024/06/04 | John Ogness <john.ogness@linutronix.de> | [add threaded printing + the rest](https://lore.kernel.org/all/20240603232453.33992-1-john.ogness@linutronix.de) | [Updated Printk Rework Patches - Necessary Step For Mainlining Linux Real-Time "RT"](https://www.phoronix.com/news/Printk-Rework-v2-Linux) | v2 ☐☑✓ | [LORE v2,0/18](https://lore.kernel.org/all/20240603232453.33992-1-john.ogness@linutronix.de) |
| 2022/09/11 | Thomas Gleixner <tglx@linutronix.de> | [printk: A new approach - WIP](https://lore.kernel.org/all/20220910221947.171557773@linutronix.de) | | v1 ☐☑✓ | [LORE v1,0/29](https://lore.kernel.org/all/20220910221947.171557773@linutronix.de) |
| 2023/09/16 | John Ogness <john.ogness@linutronix.de> | [provide nbcon base](https://lore.kernel.org/all/20230916192007.608398-1-john.ogness@linutronix.de) | [NBCON Console Patches Updated For Eventually Unblocking Real-Time Linux Kernel](https://www.phoronix.com/news/Linux-NCON-Consoles-v5) | v5 ☐☑✓ | [LORE v5,0/8](https://lore.kernel.org/all/20230916192007.608398-1-john.ogness@linutronix.de) |
@@ -361,7 +355,7 @@ $reclaim = current\_mem \times reclaim\_ratio \times max(0,1 – \frac{psi_some}
`struct scripting_ops` 封装了 perf 支持的高级语言解析框架. 可通过 script_spec_register() 注册, 当前支持 perl, python.
支持对 Python 使用 Linux perf 进行性能分析 [The challenge of compiling for verified architectures](https://lwn.net/Articles/946254).
支持对 Python 使用 Linux perf 进行性能分析 [Python support for the Linux perf profiler](https://docs.python.org/3/howto/perf_profiling.html).
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:----:|:---------:|:----:|
@@ -395,7 +389,7 @@ $reclaim = current\_mem \times reclaim\_ratio \times max(0,1 – \frac{psi_some}
|:----:|:----:|:---:|:----:|:---------:|:----:|
| 2017/10/12 | Will Deacon <will.deacon@arm.com> | [Add support for the ARMv8.2 Statistical Profiling Extension](https://lore.kernel.org/lkml/1507811438-2267-1-git-send-email-will.deacon@arm.com) | perf PMU 驱动支持 SPE | v1 ☑ 4.15-rc1 | [PatchWork v6 0/7](https://lore.kernel.org/lkml/1507811438-2267-1-git-send-email-will.deacon@arm.com) |
| 2018/01/14 | Kim Phillips <kim.phillips@arm.com> | [perf tools: Add ARM Statistical Profiling Extensions (SPE) support](https://lore.kernel.org/lkml/1507811438-2267-1-git-send-email-will.deacon@arm.com) | perf tools 支持 SPE. 这个版本实现的功能还比较简单, 直接把 SPE 的 format 数据导出到了用户态, 由 perf 直接解析, 并没有提供更进一步的 profiling 的功能. | v1 ☑ 4.16-rc1 | [PatchWork v6](https://lore.kernel.org/patchwork/cover/1128886) |
| 2020/05/30 | Leo Yan <leo.yan@linaro.org> | [perf arm-spe: Add support for synthetic events](https://lore.kernel.org/lkml/20200530122442.490-1-leo.yan@linaro.org) | 支持将 SPE 的事件进行分类解析, 可以显示热点以及汇编等信息. | v1 ☑ 5.8-rc1 | [PatchWork v8 0/3](https://lore.kernel.org/lkml/20200530122442.490-1-leo.yan@linaro.org) |
| 2020/05/30 | Leo Yan <leo.yan@linaro.org> | [perf arm-spe: Add support for synthetic events](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?id=a54ca194981be3707213437a67792b88e08264fe) | 支持将 SPE 的事件进行分类解析, 可以显示热点以及汇编等信息. | v1 ☑ 5.8-rc1 | [PatchWork v8 0/3](https://lore.kernel.org/lkml/20200530122442.490-1-leo.yan@linaro.org) |
| 2020/11/06 | Leo Yan <leo.yan@linaro.org> | [perf mem/c2c: Support AUX trace](https://lore.kernel.org/lkml/20201106094853.21082-1-leo.yan@linaro.org) | NA. | v1 ☑ 5.8-rc1 | [PatchWork v4 0/9](https://lore.kernel.org/lkml/20201106094853.21082-1-leo.yan@linaro.org) |
| 2021/02/12 | James Clark <james.clark@arm.com> | [perf arm-spe: Enable sample type PERF_SAMPLE_DATA_SRC](https://lore.kernel.org/all/20210211133856.2137-1-james.clark@arm.com) | 在 perf 数据中为 Arm SPE 支持解析 PERF_SAMPLE_DATA_SRC 数据, 当输出跟踪数据时, 它告诉 perf 它在内存事件中包含数据源. | v1 ☑ 5.8-rc1 | [PatchWork v2 1/6](https://lore.kernel.org/all/20210211133856.2137-1-james.clark@arm.com/) |
| 2020/12/13 | Leo Yan <leo.yan@linaro.org>| [perf c2c: Sort cacheline with all loads](https://lore.kernel.org/all/20201213133850.10070-1-leo.yan@linaro.org) | 实现类似 x86 下 c2c 的功能, 由于 ARM SPE 中没有默认实现类似 X86 hitM 的 data_src, 因此不能有效地判断伪共享. 当前实现方案是将所有的 load 操作排序, 方便开发人员针对伪共享进行分析. | v1 ☐ | [PatchWork v2 00/11](https://lohttps://lore.kernel.org/all/20201213133850.10070-1-leo.yan@linaro.org) |
@@ -1135,7 +1129,7 @@ Fedora 尝试优化 systemd 开机以及重启的时间, 参见 phoronix 报道
| 2024/03/27 | Wedson Almeida Filho <wedsonaf@gmail.com> | [In-place module initialisation](https://lore.kernel.org/all/20240327032337.188938-1-wedsonaf@gmail.com) | [Microsoft Engineer Sends Rust Linux Kernel Patches For In-Place Module Initialization](https://www.phoronix.com/news/Linux-Rust-In-Place-Module-Init) | v1 ☐☑✓ | [LORE v1,0/2](https://lore.kernel.org/all/20240327032337.188938-1-wedsonaf@gmail.com) |
| 2024/03/22 | Boqun Feng <boqun.feng@gmail.com> | [Memory model and atomic API in Rust](https://lore.kernel.org/all/20240322233838.868874-1-boqun.feng@gmail.com) | [A memory model for Rust code in the kernel](https://lwn.net/Articles/967049). | v1 ☐☑✓ | [LORE v1,0/3](https://lore.kernel.org/all/20240322233838.868874-1-boqun.feng@gmail.com) |
| 2024/05/14 | Wedson Almeida Filho <wedsonaf@gmail.com> | [Rust abstractions for VFS](https://lore.kernel.org/all/20240514131711.379322-1-wedsonaf@gmail.com) | 参见 phoronix 报道 [Microsoft Engineer Ports EXT2 File-System Driver To Rust](https://www.phoronix.com/news/Rust-VFS-Linux-V2-Now-With-EXT2). | v2 ☐☑✓ | [LORE v2,0/30](https://lore.kernel.org/all/20240514131711.379322-1-wedsonaf@gmail.com) |
| 2024/05/20 | Danilo Krummrich <dakr@redhat.com> | [DRM Rust abstractions and Nova](https://lore.kernel.org/all/20240520172059.181256-1-dakr@redhat.com) | [RFC Patches Posted For Rust-Written NVIDIA "Nova" GPU Driver](https://www.phoronix.com/news/RFC-Rust-Nova-NVIDIA-Driver) | v1 ☐☑✓ | [LORE v1,0/8](https://lore.kernel.org/all/20240520172059.181256-1-dakr@redhat.com) |
| 2024/05/20 | Danilo Krummrich <dakr@redhat.com> | [DRM Rust abstractions and Nova](https://lore.kernel.org/all/20240520172059.181256-1-dakr@redhat.com) | [RFC Patches Posted For Rust-Written NVIDIA "Nova" GPU Driver](https://www.phoronix.com/news/RFC-Rust-Nova-NVIDIA-Driver). | v1 ☐☑✓ | [LORE v1,0/8](https://lore.kernel.org/all/20240520172059.181256-1-dakr@redhat.com) |
## 22.2 C++
study/kernel/00-DESCRIPTION/HISTORY.md
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@@ -118,6 +118,7 @@ https://github.com/schwabe/tglx-history
[Linux kernel “historical” git repository with full history](https://stackoverflow.com/questions/3264283/linux-kernel-historical-git-repository-with-full-history)
[BitKeeper, Linux, and licensing disputes: How Linus wrote Git in 14 days (Graphite blog)](https://lwn.net/Articles/974914)
<br>
study/kernel/00-DESCRIPTION/LOCKING.md
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@@ -451,6 +451,7 @@ Peter Zijlstra 在 [RT-Summit 2017](https://wiki.linuxfoundation.org/realtime/ev
| 2022/10/03 | Connor O'Brien <connoro@google.com> | [Reviving the Proxy Execution Series](https://lore.kernel.org/all/20221003214501.2050087-1-connoro@google.com) | TODO | v1 ☐☑✓ | [2022/10/03 LORE v1,0/11](https://lore.kernel.org/all/20221003214501.2050087-1-connoro@google.com)<br>*-*-*-*-*-*-*-* <br>[2023/03/20 LORE v2,0/12](https://lore.kernel.org/all/20230320233720.3488453-1-jstultz@google.com)<br>*-*-*-*-*-*-*-* <br>[2023/04/11 LORE v3,00/14](https://lore.kernel.org/all/20230411042511.1606592-1-jstultz@google.com) |
| 2023/06/01 | John Stultz <jstultz@google.com> | [Generalized Priority Inheritance via Proxy Execution](https://lore.kernel.org/all/20230601055846.2349566-1-jstultz@google.com) | TODO | v3 ☐☑✓ | [LORE v4,0/13](https://lore.kernel.org/all/20230601055846.2349566-1-jstultz@google.com) |
| 2023/12/19 | John Stultz <jstultz@google.com> | [Proxy Execution: A generalized form of Priority Inheritance v7](https://lore.kernel.org/all/20231220001856.3710363-1-jstultz@google.com) | TODO | v7 ☐☑✓ | [2023/12/19, LORE v7,0/23](https://lore.kernel.org/all/20231220001856.3710363-1-jstultz@google.com)<br>*-*-*-*-*-*-*-* <br>[2024/02/24, LORE v8,0/7](https://lore.kernel.org/all/20240224001153.2584030-1-jstultz@google.com)<br>*-*-*-*-*-*-*-* <br>[20240401, LORE v9,0/7](https://lore.kernel.org/all/20240401234439.834544-1-jstultz@google.com) |
| 2024/05/06 | John Stultz <jstultz@google.com> | [Preparatory changes for Proxy Execution v10](https://lore.kernel.org/all/20240507045450.895430-1-jstultz@google.com) | TODO | v10 ☐☑✓ | [LORE v10,0/7](https://lore.kernel.org/all/20240507045450.895430-1-jstultz@google.com) |
| 2024/02/02 | Metin Kaya <metin.kaya@arm.com> | [sched: Add trace events for Proxy Execution (PE)](https://lore.kernel.org/all/20240202083338.1328060-1-metin.kaya@arm.com) | 添加 `sched_[start，finish]_task_selection` 跟踪事件以测量 PE 补丁在任务选择中的延迟. 此外, 在 PE 中引入有趣事件的跟踪事件:<br>1. sched_pe_enque_sleeping_task: 一个任务在睡眠任务(互斥体所有者)的等待队列中排队.<br>2. sched_pe_cross_mote_cpu: 依赖链跨远程 cpu.<br>3. sched_pe_task_is_migration: 互斥所有者任务迁移. 可以通过以下命令测试新的跟踪事件: `perf record -e sched:sched_start_task_selection -e sched:sched_finish_task_selection -e sched:sched_pe_enque_sleeping_task -e sched:sched_pe_cross_mote_cpu -e sched:sched_pe_task_is_migration`. 此补丁基于 John 的 [Proxy Execution v7 补丁系列](https://lore.kernel.org/linux-kernel/CANDhNCrHd+5twWVNqBAhVLfhMhkiO0KjxXBmwVgaCD4kAyFyWw@mail.gmail.com). | v1 ☐☑✓ | [LORE](https://lore.kernel.org/all/20240202083338.1328060-1-metin.kaya@arm.com) |
study/kernel/00-DESCRIPTION/MEMORY_MANAGER.md
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study/kernel/00-DESCRIPTION/OPEN_SOURCE.md
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@@ -109,7 +109,7 @@
| 6.7 | NA | NA | NA |
| 6.8 | [The first half of the 6.8 merge window](https://lwn.net/Articles/957188), [The rest of the 6.8 merge window](https://lwn.net/Articles/958178) | NA | NA |
| 6.9 | [The first half of the 6.9 merge window](https://lwn.net/Articles/965141), [Kernel prepatch 6.9-rc1](https://lwn.net/Articles/966525), [The rest of the 6.9 merge window](https://lwn.net/Articles/965541) | NA | NA |
| 6.10 | [The first half of the 6.10 merge window](https://lwn.net/Articles/973687) | NA | NA |
| 6.10 | [The first half of the 6.10 merge window](https://lwn.net/Articles/973687)<br>*-*-*-*-*-*-*-* <br>[The rest of the 6.10 merge window](https://lwn.net/Articles/974869)<br>*-*-*-*-*-*-*-* <br>[Kernel prepatch 6.10-rc2](https://lwn.net/Articles/976498). | NA | [Linux 6.10-rc1 Kernel Released With Many New Features](https://www.phoronix.com/news/Linux-6.10-rc1) |
年终盘点
study/kernel/00-DESCRIPTION/SCHEDULER.md
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study/kernel/00-DESCRIPTION/TODO.md
+74 -8
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@@ -120,7 +120,7 @@ khugepage_code 将选择命中率最高的节点作为首选节点, 并尝试在
| 2022/12/08 | Peter Xu <peterx@redhat.com> | [mm/uffd: Always wr-protect pte in pte|pmd_mkuffd_wp()](https://patchwork.kernel.org/project/linux-mm/patch/20221208194628.766316-1-peterx@redhat.com/) | 703082 | v1 ☐☑ | [LORE v1,0/1](https://lore.kernel.org/r/20221208194628.766316-1-peterx@redhat.com) |
| 2022/12/09 | Xander <xandermoerkerken@gmail.com> | [Added ability to vmalloc executable memory](https://patchwork.kernel.org/project/linux-mm/patch/20221209131052.64235-1-xander.moerkerken@omron.com/) | 703287 | v1 ☐☑ | [LORE v1,0/1](https://lore.kernel.org/r/20221209131052.64235-1-xander.moerkerken@omron.com) |
| 2022/12/09 | Nhat Pham <nphamcs@gmail.com> | [[v3,2/4] workingset: refactor LRU refault to expose refault recency check](https://patchwork.kernel.org/project/linux-mm/patch/20221209172922.3143160-1-nphamcs@gmail.com/) | 703468 | v3 ☐☑ | [LORE v3,0/4](https://lore.kernel.org/r/20221209172922.3143160-1-nphamcs@gmail.com) |
| 2022/12/12 | David Hildenbrand <david@redhat.com> | [[mm-stable] mm/gup_test: free memory allocated via kvcalloc() using kvfree()](https://patchwork.kernel.org/project/linux-mm/patch/20221212182018.264900-1-david@redhat.com/) | 703907 | v1 ☐☑ | [LORE v1,0/1](https://lore.kernel.org/r/20221212182018.264900-1-david@redhat.com) |
| 2022/12/12 | David Hildenbrand <david@redhat.com> | [[mm-stable] mm/GUP_test: free memory allocated via kvcalloc() using kvfree()](https://patchwork.kernel.org/project/linux-mm/patch/20221212182018.264900-1-david@redhat.com/) | 703907 | v1 ☐☑ | [LORE v1,0/1](https://lore.kernel.org/r/20221212182018.264900-1-david@redhat.com) |
| 2022/12/12 | Jason A. Donenfeld <Jason@zx2c4.com> | [mm: add VM_DROPPABLE for designating always lazily freeable mappings](https://patchwork.kernel.org/project/linux-mm/patch/20221212185347.1286824-2-Jason@zx2c4.com/) | 703918 | v12 ☐☑ | [LORE v12,0/6](https://lore.kernel.org/r/20221212185347.1286824-2-Jason@zx2c4.com)[LORE v14,0/7](https://lore.kernel.org/r/20230101162910.710293-3-Jason@zx2c4.com) |
| 2022/12/12 | Mike Kravetz <mike.kravetz@oracle.com> | [[1/2] hugetlb: really allocate vma lock for all sharable vmas](https://patchwork.kernel.org/project/linux-mm/patch/20221212235042.178355-1-mike.kravetz@oracle.com/) | 703972 | v1 ☐☑ | [LORE v1,0/2](https://lore.kernel.org/r/20221212235042.178355-1-mike.kravetz@oracle.com) |
| 2022/12/13 | Kefeng Wang <wangkefeng.wang@huawei.com> | [[-next,v3] mm: hwposion: support recovery from ksm_might_need_to_copy()](https://patchwork.kernel.org/project/linux-mm/patch/20221213030557.143432-1-wangkefeng.wang@huawei.com/) | 703997 | v3 ☐☑ | [LORE v3,0/1](https://lore.kernel.org/r/20221213030557.143432-1-wangkefeng.wang@huawei.com) |
@@ -188,8 +188,8 @@ https://www.latexlive.com
| 2023/02/06 | Sergey Senozhatsky <senozhatsky@chromium.org> | [zsmalloc: fine-grained fullness grouping](https://patchwork.kernel.org/project/linux-mm/cover/20230206092559.2722946-1-senozhatsky@chromium.org/) | 719058 | v1 ☐☑ | [LORE v1,0/2](https://lore.kernel.org/r/20230206092559.2722946-1-senozhatsky@chromium.org) |
| 2023/02/06 | Charan Teja Kalla <quic_charante@quicinc.com> | [mm: shmem: support POSIX_FADV_[WILL|DONT]NEED for shmem files](https://patchwork.kernel.org/project/linux-mm/cover/cover.1675690847.git.quic_charante@quicinc.com/) | 719143 | v6 ☐☑ | [LORE v6,0/2](https://lore.kernel.org/r/cover.1675690847.git.quic_charante@quicinc.com) |
| 2023/02/11 | Matthew Wilcox <willy@infradead.org> | [New arch interfaces for manipulating multiple pages](https://patchwork.kernel.org/project/linux-mm/cover/20230211033948.891959-1-willy@infradead.org/) | 720910 | v1 ☐☑ | [LORE v1,0/7](https://lore.kernel.org/r/20230211033948.891959-1-willy@infradead.org) |
| 2023/02/13 | Deepak Gupta <debug@rivosinc.com> | [[v1,RFC,Zisslpcfi,05/20] mmap : Introducing new protection "PROT_SHADOWSTACK" for mmap](https://patchwork.kernel.org/project/linux-mm/patch/20230213045351.3945824-6-debug@rivosinc.com/) | 721169 | v1 ☐☑ | [LORE v1,0/20](https://lore.kernel.org/r/20230213045351.3945824-6-debug@rivosinc.com) |
| 2023/02/13 | Deepak Gupta <debug@rivosinc.com> | [[v1,RFC,Zisslpcfi,05/20] mmap : Introducing new protection "PROT_SHADOWSTACK" for mmap](https://patchwork.kernel.org/project/linux-mm/patch/20230213045351.3945824-6-debug@rivosinc.com/) | 721169 | v1 ☐☑ | [LORE v1,0/20](https://lore.kernel.org/r/20230213045351.3945824-6-debug@rivosinc.com) |
| 2023/02/13 | Deepak GUPta <debug@rivosinc.com> | [[v1,RFC,Zisslpcfi,05/20] mmap : Introducing new protection "PROT_SHADOWSTACK" for mmap](https://patchwork.kernel.org/project/linux-mm/patch/20230213045351.3945824-6-debug@rivosinc.com/) | 721169 | v1 ☐☑ | [LORE v1,0/20](https://lore.kernel.org/r/20230213045351.3945824-6-debug@rivosinc.com) |
| 2023/02/13 | Deepak GUPta <debug@rivosinc.com> | [[v1,RFC,Zisslpcfi,05/20] mmap : Introducing new protection "PROT_SHADOWSTACK" for mmap](https://patchwork.kernel.org/project/linux-mm/patch/20230213045351.3945824-6-debug@rivosinc.com/) | 721169 | v1 ☐☑ | [LORE v1,0/20](https://lore.kernel.org/r/20230213045351.3945824-6-debug@rivosinc.com) |
| 2023/02/17 | Alexander Halbuer <halbuer@sra.uni-hannover.de> | [mm, page_alloc: batch cma update on pcp buffer refill](https://patchwork.kernel.org/project/linux-mm/patch/20230217120504.87043-1-halbuer@sra.uni-hannover.de/) | 722919 | v1 ☐☑ | [LORE v1,0/1](https://lore.kernel.org/r/20230217120504.87043-1-halbuer@sra.uni-hannover.de) |
@@ -490,7 +490,7 @@ BPF verifiery 已经做了很多工作来尽量确保加载进 kernel 的 BPF pr
| 2023/05/15 | Jeff Xu <jeffxu@chromium.org> | [Memory Mapping (VMA) protection using PKU - set 1](https://patchwork.kernel.org/project/linux-mm/cover/20230515130553.2311248-1-jeffxu@chromium.org/) | 747576 | v1 ☐☑ | [LORE v1,0/6](https://lore.kernel.org/r/20230515130553.2311248-1-jeffxu@chromium.org)<br>*-*-*-*-*-*-*-* <br>[LORE v1,0/6](https://lore.kernel.org/r/20230519011915.846407-1-jeffxu@chromium.org)<br>*-*-*-*-*-*-*-* <br>[LORE v1,0/6](https://lore.kernel.org/r/20230519011915.846407-1-jeffxu@chromium.org) |
|
| 2023/05/19 | Joel Fernandes <joel@joelfernandes.org> | [Optimize mremap during mutual alignment within PMD](https://patchwork.kernel.org/project/linux-mm/cover/20230519190934.339332-1-joel@joelfernandes.org/) | 749361 | v2 ☐☑ | [LORE v2,0/4](https://lore.kernel.org/r/20230519190934.339332-1-joel@joelfernandes.org)<br>*-*-*-*-*-*-*-* <br>[LORE v3,0/6](https://lore.kernel.org/r/20230524153239.3036507-1-joel@joelfernandes.org) |
| 2023/06/13 | Peter Xu <peterx@redhat.com> | [mm/gup: Unify hugetlb, speed up thp](https://patchwork.kernel.org/project/linux-mm/cover/20230613215346.1022773-1-peterx@redhat.com/) | 756868 | v1 ☐☑ | [LORE v1,0/7](https://lore.kernel.org/r/20230613215346.1022773-1-peterx@redhat.com)<br>*-*-*-*-*-*-*-* <br>[LORE v2,0/8](https://lore.kernel.org/r/20230619231044.112894-1-peterx@redhat.com)<br>*-*-*-*-*-*-*-* <br>[LORE v4,0/8](https://lore.kernel.org/r/20230628215310.73782-1-peterx@redhat.com |
| 2023/06/13 | Peter Xu <peterx@redhat.com> | [mm/GUP: Unify hugetlb, speed up thp](https://patchwork.kernel.org/project/linux-mm/cover/20230613215346.1022773-1-peterx@redhat.com/) | 756868 | v1 ☐☑ | [LORE v1,0/7](https://lore.kernel.org/r/20230613215346.1022773-1-peterx@redhat.com)<br>*-*-*-*-*-*-*-* <br>[LORE v2,0/8](https://lore.kernel.org/r/20230619231044.112894-1-peterx@redhat.com)<br>*-*-*-*-*-*-*-* <br>[LORE v4,0/8](https://lore.kernel.org/r/20230628215310.73782-1-peterx@redhat.com |
| 2023/06/16 | Huang, Ying <ying.huang@intel.com> | [memory tiering: calculate abstract distance based on ACPI HMAT](https://patchwork.kernel.org/project/linux-mm/cover/20230616070538.190042-1-ying.huang@intel.com/) | 757742 | v1 ☐☑ | [LORE v1,0/4](https://lore.kernel.org/r/20230616070538.190042-1-ying.huang@intel.com) |
| 2023/06/16 | Mike Rapoport <rppt@kernel.org> | [mm: jit/text allocator](https://patchwork.kernel.org/project/linux-mm/cover/20230616085038.4121892-1-rppt@kernel.org/) | 757762 | v2 ☐☑ | [LORE v2,0/12](https://lore.kernel.org/r/20230616085038.4121892-1-rppt@kernel.org) |
| 2023/06/16 | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | [Add support for DAX vmemmap optimization for ppc64](https://patchwork.kernel.org/project/linux-mm/cover/20230616110826.344417-1-aneesh.kumar@linux.ibm.com/) | 757832 | v2 ☐☑ | [LORE v2,0/16](https://lore.kernel.org/r/20230616110826.344417-1-aneesh.kumar@linux.ibm.com)<br>*-*-*-*-*-*-*-* <br>[LORE v4,0/13](https://lore.kernel.org/r/20230710160842.56300-1-aneesh.kumar@linux.ibm.com) |
@@ -645,6 +645,7 @@ cba6167f0adb
| 2024/03/29 | Chunxin Zang <spring.cxz@gmail.com> | [sched/fair: Reset vlag in dequeue when PLAGE_LAG is disabled](https://lore.kernel.org/all/20240329091933.340739-1-spring.cxz@gmail.com) | TODO | v1 ☐☑✓ | [LORE](https://lore.kernel.org/all/20240329091933.340739-1-spring.cxz@gmail.com) |
| 2024/04/03 | Pierre Gondois <pierre.gondois@arm.com> | [sched/fair|isolation: Correctly clear nohz.[nr_cpus|idle_cpus_mask] for isolated CPUs](https://lore.kernel.org/all/20240403150543.2793354-1-pierre.gondois@arm.com) | TODO | v1 ☐☑✓ | [LORE v1,0/7](https://lore.kernel.org/all/20240403150543.2793354-1-pierre.gondois@arm.com) |
[Dropping the page cache for filesystems](https://lwn.net/Articles/977486)
[udev-hid-bpf To Help Enable HID-BPF Use Rather Than Kernel Drivers To Fix HID Hardware](https://www.phoronix.com/news/udev-hid-bpf)
@@ -653,19 +654,84 @@ cba6167f0adb
[Better linked-list traversal in BPF](https://lwn.net/Articles/964381)
[A proposal for shared memory in BPF programs](https://lwn.net/Articles/961941)
[Sleepable BPF programs](https://lwn.net/Articles/825415)
[A plan to make BPF kfuncs polymorphic](https://lwn.net/Articles/974102)
[Recent improvements to BPF's struct_ops mechanism](https://lwn.net/Articles/974848)
[An instruction-level BPF memory model](https://lwn.net/Articles/976071/)
[Comparing BPF performance between implementations](https://lwn.net/Articles/976317)
[Wattch: a framework for architectural-level power analysis and optimizations](https://ieeexplore.ieee.org/document/854380)
[Dynamically sizing the kernel stack](https://lwn.net/Articles/974367)
[Intel Talks Up 2024 Xeon Sierra Forest & Granite Rapids At Hot Chips](https://www.phoronix.com/review/intel-hotchips-2023)
[uksmd](https://codeberg.org/pf-kernel/uksmd) 提供了一个 Userspace KSM helper daemon, [CachyOS](https://github.com/CachyOS/uksmd) 将其用在了自己的发行版中. 守护进程会定期检查用户空间任务列表, 并通知 ksmd kthread 设置相关进程 mm_struct 的 MM_VM_MERGE_ANY 标记, 以自动合并具有相同内容的内存页. 仅处理长期任务. 该机制依赖于 v6.4 [mm: process/cgroup ksm support](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?id=07115fcc15b4aa5c268fb80b82ad15868a82a285) 以及 [pf-kernel/linux](https://codeberg.org/pf-kernel/linux) 内核提供的 `process_ksm_{enable,disable,status}()` 系统调用;
[Memory Sealing"mseal"System Call Merged For Linux 6.10](https://www.phoronix.com/news/Linux-6.10-Merges-mseal)
| 2024/05/27 | Tero Kristo <tero.kristo@linux.intel.com> | [Intel Performance Limit Reasons support](https://lore.kernel.org/all/20240527133400.483634-1-tero.kristo@linux.intel.com) | 英特尔性能限制原因可以报告为什么性能 / 功耗在芯片级别或芯片内的单个 CPU 内核受到限制. 今天, 随着 Linux 内核邮件列表的一组新补丁的发布, 英特尔 PLR 硬件性能事件报告正在连接中. 这些信息通过 DebugFS 传达到用户空间, 供管理员直接访问, 或者供其他应用程序了解为什么他们的 CPU 性能可能受到限制. 对于英特尔性能限制原因提出的 Linux 补丁, 信息通过 `/sys/kernel/debug/tpmi-*/plr/domain*/status` 上报. 但是, 与 DebugFS 一样, `/sys/kernel/debug/` 的访问通常需要 ROOT 权限. 该组补丁提供了一个 INTEL_PLR_TPMI 的 Kconfig 选项, 用于控制此英特尔 PLR 驱动程序. 参见 phoronix 报道 [Intel Performance Limit Reasons For Linux To Report Why Your CPU Is Downclocking](https://www.phoronix.com/news/Intel-Perf-Limit-Reasons-Linux) | v2 ☐☑✓ | [LORE v2,0/6](https://lore.kernel.org/all/20240527133400.483634-1-tero.kristo@linux.intel.com) |
| 2024/02/26 | Lai Jiangshan <jiangshanlai@gmail.com> | [KVM: x86/PVM: Introduce a new hypervisor](https://lore.kernel.org/all/20240226143630.33643-1-jiangshanlai@gmail.com) | TODO | v1 ☐☑✓ | [LORE v1,0/73](https://lore.kernel.org/all/20240226143630.33643-1-jiangshanlai@gmail.com) |
| 2020/05/04 | Alexandre Chartre <alexandre.chartre@oracle.com> | [ASI - Part I (ASI Infrastructure and PTI)](https://lore.kernel.org/all/20200504144939.11318-1-alexandre.chartre@oracle.com) | TODO | v4 ☐☑✓ | [LORE v4,0/7](https://lore.kernel.org/all/20200504144939.11318-1-alexandre.chartre@oracle.com) |
| 2024/02/14 | Ard Biesheuvel <ardb+git@google.com> | [arm64: Add support for LPA2 and WXN at stage 1](https://lore.kernel.org/all/20240214122845.2033971-45-ardb+git@google.com) | TODO | v8 ☐☑✓ | [LORE v7,00/50](https://lore.kernel.org/all/20240123145258.1462979-52-ardb+git@google.com)<br>*-*-*-*-*-*-*-*<br>[LORE v8,0/43](https://lore.kernel.org/all/20240214122845.2033971-45-ardb+git@google.com) |
[WeWe-RSS](https://help.railway.app/templates/we-we-rss-d75eade8)
[免费部署wewe-rss服务](https://stupidjoey.net/posts/deploy_wewe_rss/)
[一键部署属于自己的微信公众号RSS(wewe-rss)](https://foxistudy.com/posts/wewe-rss/)
[专利号-WO2021US19353-Apple-ON-DEMAND MEMORY ALLOCATION](https://xueshu.baidu.com/usercenter/paper/show?paperid=102r0eg05d3q02p0mh7c0v60eu667084)
公开了与动态分配和映射私有内存的请求电路的技术方案. 这种硬件电路可以接收私有地址并将该私有地址转换为虚拟地址. 在一些实施例中, 私有存储器分配电路被配置成生成页表信息, 如果页表信息尚未设置, 则映射所请求的私有内存页. 在各种实施例中，这可以有利地允许动态私有内存分配, 例如, 有效地为具有不同类型工作负载的图形着色器分配内存. 与传统技术相比, 公开的页表信息缓存技术可以提高性能. 此外, 公开的实施例可以促进跨设备(例如图形处理器)的内存整合.
[The Forward Slice Core Microarchitecture](https://dl.acm.org/doi/10.1145/3410463.3414629)
[RL-CoPref: a reinforcement learning-based coordinated prefetching controller for multiple prefetchers](https://link.springer.com/article/10.1007/s11227-024-05938-9)
[eas_overview_and_integration_guide_r1p6.pdf](https://developer.arm.com/-/media/Arm%20Developer%20Community/PDF/Open%20Source/energy-aware-scheduling/eas_overview_and_integration_guide_r1p6.pdf)
[能量感知调度¶](https://www.kernel.org/doc/html/latest/translations/zh_CN/scheduler/sched-energy.html)
[Capturing stack traces asynchronously with BPF](https://lwn.net/Articles/978736)
| 编号 | 作者 | 工具 | 描述 | 链接 |
|:---:|:-----:|:----:|:---:|:----:
| 1 | paulmckrcu | [litmus](https://github.com/paulmckrcu/litmus) | Automatically generated litmus tests for validation LISA-language Linux-kernel memory models | [github/paulmckrcu/litmus](https://github.com/paulmckrcu/litmus) |
| 2 | herd | [herd/herdtools7](https://github.com/herd/herdtools7) | 一个用于测试弱内存模型的工具套件. HERD7: 用于弱内存模型的通用模拟器, litmus7: 运行 litmus 测试(作为 Power、ARM、AArch64 或 X86 的汇编程序提供)来测试执行机器的内存模型, DIY7: 根据简明规范制作石蕊测试 | [官网](http://diy.inria.fr) |
| 3 | Hernan Ponce de Leon 等 | [Dat3M](https://github.com/hernanponcedeleon/Dat3M) | Memory Model Aware Verification, Dartagnan is a tool to check state reachability under weak memory models. | [github/hernanponcedeleon/Dat3M](https://github.com/hernanponcedeleon/Dat3M) |
| 4 | MPI-SWS(Max Planck Institute for Software Systems) | [GenMC](https://github.com/MPI-SWS/genmc) | A Model Checker for Weak Memory Models | [官网](https://plv.mpi-sws.org/genmc), [论文引用详情](https://ouci.dntb.gov.ua/en/works/4ryroeM7), [github/MPI-SWS/genmc](https://github.com/MPI-SWS/genmc) |
| 5 | MPI-SWS(Max Planck Institute for Software Systems) | [Kater](https://github.com/MPI-SWS/kater) | Automating Weak Memory Model Metatheory and Consistency Checking | [MPI-SWS/kater](https://github.com/MPI-SWS/kater) |
| 6 | NVlabs | [NVlabs/mixedproxy](https://github.com/NVlabs/mixedproxy) | Mixed-Proxy Extensions for the NVIDIA PTX Memory Consistency Model | [NVlabs/mixedproxy](https://github.com/NVlabs/mixedproxy) |
| 7 | [Open, Safe and Scalable System Software Concurrency](https://github.com/open-s4c) | [vsyncer](https://github.com/open-s4c/vsyncer) | vsyncer: is a toolkit to verify and optimize concurrent C/C++ programs on WMMs, which employs state-of-the-art model checkers Dartagnan and GenMC. | [](https://github.com/open-s4c)
study/kernel/00-DESCRIPTION/TOOLS.md
+11
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@@ -240,6 +240,17 @@ Arch Linux 在 2022 年 5 月份开始了也提供了他们的 [debuginfod 调
[Intel Makes Continuous Profiler Open-Source To Help Improve CPU Performance](https://www.phoronix.com/news/Intel-Continuous-Profiler-OSS)
# 6 测试
-------
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:---:|:----:|:---:|:----:|:---------:|:----:|
| 2024/02/28 | Helen Koike <helen.koike@collabora.com> | [kci-gitlab: Introducing GitLab-CI Pipeline for Kernel Testing](https://lore.kernel.org/all/20240228225527.1052240-1-helen.koike@collabora.com) | [GitLab CI for the kernel](https://lwn.net/Articles/972713). | v1 ☐☑✓ | [LORE v1,0/3](https://lore.kernel.org/all/20240228225527.1052240-1-helen.koike@collabora.com) |
<br>
* 本作品/博文 ( [AderStep-紫夜阑珊-青伶巷草 Copyright ©2013-2017](http://blog.csdn.net/gatieme) ), 由 [成坚(gatieme)](http://blog.csdn.net/gatieme) 创作.