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description: update 20211017

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study/kernel/00-DESCRIPTION/MEMORY_MANAGER.md
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@@ -267,7 +267,7 @@ Linux 一开始是在一台i386上的机器开发的, i386 的硬件页表是2
| 2021/06/30 | "Matthew Wilcox (Oracle)" <willy@infradead.org> | [Folio conversion of memcg](https://lwn.net/Articles/1450196) | NA | v3 ☐ | [PatchWork v13b](https://patchwork.kernel.org/project/linux-mm/cover/20210712194551.91920-1-willy@infradead.org/) |
| 2021/07/19 | "Matthew Wilcox (Oracle)" <willy@infradead.org> | [Folio support in block + iomap layers](https://lwn.net/Articles/1450196) | NA | v15 ☐ | [PatchWork v15,00/17](https://patchwork.kernel.org/project/linux-mm/cover/20210712194551.91920-1-willy@infradead.org/) |
| 2021/07/15 | "Matthew Wilcox (Oracle)" <willy@infradead.org> | [Memory folios: Pagecache edition](https://patchwork.kernel.org/project/linux-mm/cover/20210715200030.899216-1-willy@infradead.org) | NA | v14c ☑ 5.16-rc1 | [PatchWork v14c,00/39](https://patchwork.kernel.org/project/linux-mm/cover/20210715200030.899216-1-willy@infradead.org) |
| 2021/11/10 | David Howells <dhowells@redhat.com> | [netfs, 9p, afs, ceph: Support folios, at least partially](https://patchwork.kernel.org/project/linux-mm/cover/163649323416.309189.4637503793406396694.stgit@warthog.procyon.org.uk) | NA | v5 ☐ | [PatchWork v4,0/5](https://patchwork.kernel.org/project/linux-mm/cover/163649323416.309189.4637503793406396694.stgit@warthog.procyon.org.uk)<br>*-*-*-*-*-*-*-* <br>[PatchWork v5,0/4](https://patchwork.kernel.org/project/linux-mm/cover/163657847613.834781.7923681076643317435.stgit@warthog.procyon.org.uk) |
| 2021/11/10 | David Howells <dhowells@redhat.com> | [netfs, 9p, afs, ceph: Support folios, at least partially](https://www.phoronix.com/scan.php?page=news_item&px=AFS-9p-NETFS-Folios-Linux-5.16) | NA | v5 ☑ 5.16-rc1 | [PatchWork v4,0/5](https://patchwork.kernel.org/project/linux-mm/cover/163649323416.309189.4637503793406396694.stgit@warthog.procyon.org.uk)<br>*-*-*-*-*-*-*-* <br>[PatchWork v5,0/4](https://patchwork.kernel.org/project/linux-mm/cover/163657847613.834781.7923681076643317435.stgit@warthog.procyon.org.uk)<br>*-*-*-*-*-*-*-* <br>[Merge tag](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0f7ddea6225b9b001966bc9665924f1f8b9ac535) |
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
@@ -1536,6 +1536,9 @@ active 头(热烈使用中) > active 尾 > inactive 头 > inactive 尾(被驱逐
Google 测试多代 LRU 为 Linux 带来更好的性能提升, 参见 [Google Proposes Multi-Generational LRU For Linux To Yield Much Better Performance](https://www.phoronix.com/scan.php?page=news_item&px=Linux-Multigen-LRU).
["MGLRU" Code Updated For More Performant Linux Page Reclamation](https://www.phoronix.com/scan.php?page=news_item&px=Multigen-LRU-v5)
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:----:|:---------:|:----:|
| 2021/11/11 | Yu Zhao <yuzhao@google.com> | [Multigenerational LRU Framework(https://lwn.net/Articles/856931) | 将 LRU 的列表划分为多代老化. 通过 CONFIG_LRU_GEN 来控制. | v3 ☐ | [Patchwork v1,00/14](https://lore.kernel.org/patchwork/patch/1394674)<br>*-*-*-*-*-*-*-*<br>[PatchWork v2,00/16](https://lore.kernel.org/patchwork/cover/1412560)<br>*-*-*-*-*-*-*-*<br>[2021/05/20 PatchWork v3,00/14](https://patchwork.kernel.org/project/linux-mm/cover/20210520065355.2736558-1-yuzhao@google.com)<br>*-*-*-*-*-*-*-*<br>[2021/08/18 PatchWork v4,00/11](https://patchwork.kernel.org/project/linux-mm/cover/20210818063107.2696454-1-yuzhao@google.com)<br>*-*-*-*-*-*-*-*<br>[2021/11/11 PatchWork v5,00/10](https://patchwork.kernel.org/project/linux-mm/cover/20211111041510.402534-1-yuzhao@google.com) |
@@ -3344,9 +3347,9 @@ DAMON 利用两个核心机制 : **基于区域的采样**和**自适应区域
| 2021/10/19 | SeongJae Park <sjpark@amazon.com> | [Introduce DAMON-based Proactive Reclamation](https://lwn.net/Articles/863753) | 该补丁集改进了用于生产质量的通用数据访问模式内存管理的引擎, 并在其之上实现了主动回收. | v4 ☑ 5.16-rc1 | [PatchWork RFC,00/13](https://patchwork.kernel.org/project/linux-mm/cover/20210720131309.22073-1-sj38.park@gmail.com)<br>*-*-*-*-*-*-*-* <br>[PatchWork RFC,v2,00/14](https://patchwork.kernel.org/project/linux-mm/patch/20210608115254.11930-15-sj38.park@gmail.com)<br>*-*-*-*-*-*-*-* <br>[PatchWork RFC,v3,00/15](https://patchwork.kernel.org/project/linux-mm/cover/20210720131309.22073-1-sj38.park@gmail.com)<br>*-*-*-*-*-*-*-* <br>[PatchWork v4 00/15](https://patchwork.kernel.org/project/linux-mm/cover/20211019150731.16699-1-sj@kernel.org) |
| 2021/08/31 | SeongJae Park <sjpark@amazon.com>/<sj38.park@gmail.com>/<sjpark@amazon.de> | [mm/damon/vaddr: Safely walk page table](https://patchwork.kernel.org/project/linux-mm/patch/20210831161800.29419-1-sj38.park@gmail.com) | 提交 linux-mm 的 [3f49584b262c ("mm/damon: implement primitives for the virtual memory address spaces")](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3f49584b262c) 尝试使用 follow_invalidate_PTE() 查找任意虚拟地址的 PTE 或 PMD, 但没有正确锁定. 此提交通过在正确的锁定(保持 mmap 读取锁定)下使用另一个页面表遍历函数来解决此问题, 并使用了更通用的 walk_page_range(). | v1 ☐ | [PatchWork v2](https://patchwork.kernel.org/project/linux-mm/patch/20210831161800.29419-1-sj38.park@gmail.com) |
| 2021/09/17 | SeongJae Park <sjpark@amazon.com> | [mm, mm/damon: Trivial fixes](https://patchwork.kernel.org/project/linux-mm/cover/20210917123958.3819-1-sj@kernel.org) | DAMON 的 fix 补丁. | v1 ☐ | [PatchWork 0/5](https://patchwork.kernel.org/project/linux-mm/cover/20210917123958.3819-1-sj@kernel.org) |
| 2021/10/01 | SeongJae Park <sjpark@amazon.com> | [Implement Data Access Monitoring-based Memory Operation Schemes](https://patchwork.kernel.org/project/linux-mm/cover/20211001125604.29660-1-sj@kernel.org) | 实现了 DAMON 的基于数据访问监视的操作方案 (DAMOS).<br>DAMON 可以用作支持数据访问的内存管理优化的原语. 因此, 希望进行此类优化的用户应该运行 DAMON, 读取监视结果, 分析并优化内存管理方案.<br>然而, 在许多其他情况下, 用户只是希望系统对具有特定时间的特定访问频率的特定大小的内存区域应用内存管理操作. 例如, “page out a memory region than 100mib only rare visits more than 2 minutes”, 或者 “Do not use THP For a memory region than 2mib rarely visits more than 1 seconds”. 为了使工作更容易且不冗余, 这个补丁集实现了 DAMON 的一个新特性, 称为基于数据访问监视的操作方案 (DAMOS). 使用该特性, 用户可以以简单的方式描述常规方案, 并要求 DAMON 自行执行这些方案.<br>DAMOS 对于内存管理优化是准确和有用的.<br>1. THP 的一个实验性的基于 damon 的操作方案 'ethp' 减少了 76.15% 的 THP 内存开销, 同时保留了 51.25% 的 THP 加速.<br>2. 另一个实验性的基于 damon 的 "主动回收" 实现 "prcl", 减少了 93.38% 的 residential sets 和 23.63% 的内存占用, 而在最好的情况下只产生 1.22% 的运行时开销 (parsec3/freqmine). | v1 ☐ | [2020/12/16 PatchWork RFC,v15.1,0/8](https://patchwork.kernel.org/project/linux-mm/cover/20201216084404.23183-1-sjpark@amazon.com)<br>*-*-*-*-*-*-*-* <br>[2021/10/01 PatchWork 0/7](https://patchwork.kernel.org/project/linux-mm/cover/20211001125604.29660-1-sj@kernel.org) |
| 2021/10/01 | SeongJae Park <sjpark@amazon.com> | [Implement Data Access Monitoring-based Memory Operation Schemes](https://patchwork.kernel.org/project/linux-mm/cover/20211001125604.29660-1-sj@kernel.org) | 实现了 DAMON 的基于数据访问监视的操作方案 (DAMOS).<br>DAMON 可以用作支持数据访问的内存管理优化的原语. 因此, 希望进行此类优化的用户应该运行 DAMON, 读取监视结果, 分析并优化内存管理方案.<br>然而, 在许多其他情况下, 用户只是希望系统对具有特定时间的特定访问频率的特定大小的内存区域应用内存管理操作. 例如, “page out a memory region than 100mib only rare visits more than 2 minutes”, 或者 “Do not use THP For a memory region than 2mib rarely visits more than 1 seconds”. 为了使工作更容易且不冗余, 这个补丁集实现了 DAMON 的一个新特性, 称为基于数据访问监视的操作方案 (DAMOS). 使用该特性, 用户可以以简单的方式描述常规方案, 并要求 DAMON 自行执行这些方案.<br>DAMOS 对于内存管理优化是准确和有用的.<br>1. THP 的一个实验性的基于 damon 的操作方案 'ethp' 减少了 76.15% 的 THP 内存开销, 同时保留了 51.25% 的 THP 加速.<br>2. 另一个实验性的基于 damon 的 "主动回收" 实现 "prcl", 减少了 93.38% 的 residential sets 和 23.63% 的内存占用, 而在最好的情况下只产生 1.22% 的运行时开销 (parsec3/freqmine). | v1 ☑ 5.16-rc1 | [2020/12/16 PatchWork RFC,v15.1,0/8](https://patchwork.kernel.org/project/linux-mm/cover/20201216084404.23183-1-sjpark@amazon.com)<br>*-*-*-*-*-*-*-* <br>[2021/10/01 PatchWork 0/7](https://patchwork.kernel.org/project/linux-mm/cover/20211001125604.29660-1-sj@kernel.org) |
| 2021/10/08 | SeongJae Park <sjpark@amazon.com> | [mm/damon/dbgfs: Implement recording feature](https://patchwork.kernel.org/project/linux-mm/patch/20211008094509.16179-1-sj@kernel.org) | 为 'damon-dbgfs' 实现 'recording' 特性<br>用户空间可以通过 'damon_aggregate' 跟踪点事件获得监视结果. 为了简单起见, 跟踪点事件有一些重复的信息, 比如 'target_id' 和 'nr_regions'. 这造成它的大小比实际需要的要大. 另外, 对于一些简单的用例, 处理跟踪点可能会很复杂. 为了给用户空间提供一种更有效和简单的监控结果的方法, 这个提交实现了 'damon-dbgfs' 中的 'recording' 特性. 该特性通过一个名为 'record' 的新 debugfs 文件导出到用户空间, 该文件位于 '/damon/' 目录下. 该文件允许用户以简单格式在常规二进制文件中记录监视的访问模式. 记录的结果首先写入内存缓冲区并批处理刷新到文件中. 用户可以通过读取和写入 record 文件来获取和设置缓冲区的大小和结果文件的路径. | v1 ☐ | [PatchWork 1/4](https://patchwork.kernel.org/project/linux-mm/patch/20211008094509.16179-1-sj@kernel.org) |
| 2021/10/08 | SeongJae Park <sjpark@amazon.com> | [DAMON: Support Physical Memory Address Space Monitoring](https://www.phoronix.com/scan.php?page=news_item&px=DAMON-Physical-Monitoring) | 允许物理地址空间监控. | v1 ☐ | [PatchWork RFC,v9,00/10](https://patchwork.kernel.org/project/linux-mm/cover/20201007071409.12174-1-sjpark@amazon.com)<br>*-*-*-*-*-*-*-* <br>[PatchWork RFC,v10,00/13](https://patchwork.kernel.org/project/linux-mm/cover/20201216094221.11898-1-sjpark@amazon.com))<br>*-*-*-*-*-*-*-* <br>[PatchWork 0/7](https://patchwork.kernel.org/project/linux-mm/cover/20211012205711.29216-1-sj@kernel.org)|
| 2021/10/12 | SeongJae Park <sjpark@amazon.com> | [DAMON: Support Physical Memory Address Space Monitoring](https://www.phoronix.com/scan.php?page=news_item&px=DAMON-Physical-Monitoring) | 允许物理地址空间监控. | v1 ☑ 5.16-rc1 | [PatchWork RFC,v9,00/10](https://patchwork.kernel.org/project/linux-mm/cover/20201007071409.12174-1-sjpark@amazon.com)<br>*-*-*-*-*-*-*-* <br>[PatchWork RFC,v10,00/13](https://patchwork.kernel.org/project/linux-mm/cover/20201216094221.11898-1-sjpark@amazon.com))<br>*-*-*-*-*-*-*-* <br>[PatchWork 0/7](https://patchwork.kernel.org/project/linux-mm/cover/20211012205711.29216-1-sj@kernel.org)|
| 2021/10/12 | Xin Hao <xhao@linux.alibaba.com> | [mm/damon/dbgfs: add region_stat interface](https://patchwork.kernel.org/project/linux-mm/patch/20211012054948.90381-1-xhao@linux.alibaba.com) | DAMON 中使用 damon-dbgfs 操作带来了很大的便利, 有时候如果我希望能够查看任务的划分区域 nr_access 等值, 当前这不能直接通过 dbgfs 接口查看, 所以添加一个接口 "region_stat" 来显示. | v1 ☐ | [PatchWork](https://patchwork.kernel.org/project/linux-mm/patch/20211012054948.90381-1-xhao@linux.alibaba.com/) |
| 2021/10/13 | Xin Hao <xhao@linux.alibaba.com> | [mm/damon: Adjust the size of kbuf array to avoid overflow](https://patchwork.kernel.org/project/linux-mm/patch/20211013114854.15705-1-xhao@linux.alibaba.com) | NA | v1 ☐ | [PatchWork](https://patchwork.kernel.org/project/linux-mm/patch/20211013114854.15705-1-xhao@linux.alibaba.com) |
| 2021/10/16 | Xin Hao <xhao@linux.alibaba.com> | [mm/damon/core: Optimize kdamod.%d thread creation code](https://patchwork.kernel.org/project/linux-mm/patch/20211016165914.96049-1-xhao@linux.alibaba.com) | 当 ctx->adaptive_targets 列表为空, 无需创建并调用kdamond. 只有当 ctx->adaptive_targets 列表不为空, 且 ctx->kdamond 指针为 NULL 时, 才调用__damon_start函数. | v1 ☐ | [PatchWork v1](https://patchwork.kernel.org/project/linux-mm/patch/20211016165616.95849-1-xhao@linux.alibaba.com)<br>*-*-*-*-*-*-*-* <br>[PatchWork v2](https://patchwork.kernel.org/project/linux-mm/patch/20211016165914.96049-1-xhao@linux.alibaba.com) |
study/kernel/00-DESCRIPTION/SCHEDULER.md
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@@ -1011,6 +1011,7 @@ ARM64 机器(如 kunpeng920)和 x86 机器(如 Jacobsville)具有一定的硬件
[Cluster-Aware Scheduling Lands In Linux 5.16](https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.16-Sched-Core)
| 计划 | 任务 | 描述 |
|:---:|:----:|:---:|
| 第一个系列 | 增加 cluster 调度域 | 让拓扑域感知 cluster 的存在, 在 sysfs 接口中提供 cluster 的信息(包括 id 和 cpumask 等), 并添加 CONFIG_SCHED_CLUSTER, 可以在 cluster 之间实现负载平衡, 从而使大量工作负载受益. 测试表明, 在 Jacobsville 上增加 25.1% 的 SPECrate mcf, 在 kunpeng920 上增加 13.574% 的 mcf. |
@@ -1019,8 +1020,8 @@ ARM64 机器(如 kunpeng920)和 x86 机器(如 Jacobsville)具有一定的硬件
| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:----:|:---:|:----------:|:---:|
| 2021/09/20 | Barry Song <song.bao.hua@hisilicon.com> | [scheduler: expose the topology of clusters and add cluster scheduler](https://lore.kernel.org/patchwork/cover/1415806) | 增加了 cluster 层次的 CPU select. 多个架构都是有 CLUSTER 域的概念的, 比如 Kunpeng 920 一个 NODE(DIE) 24个 CPU 分为 8 个 CLUSTER, 整个 DIE 共享 L3 tag, 但是一个 CLUSTER 使用一个 L3 TAG. 这种情况下对于有数据共享的进程, 在一个 cluster 上运行, 通讯的时延更低. | RFC v6 ☐ | [2020/12/01 PatchWork RFC,v2,0/2](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20201201025944.18260-1-song.bao.hua@hisilicon.com)<br>*-*-*-*-*-*-*-* <br>[2021/03/01 PatchWork RFC,v4,0/4](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210301225940.16728-1-song.bao.hua@hisilicon.com)<br>*-*-*-*-*-*-*-* <br>[2021/03/19 PatchWork RFC,v5,0/4](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210319041618.14316-1-song.bao.hua@hisilicon.com)<br>*-*-*-*-*-*-*-* <br>[2021/09/20 PatchWork v6,0/4](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210420001844.9116-1-song.bao.hua@hisilicon.com) |
| 2021/06/15 | Peter Zijlstra | [Represent cluster topology and enable load balance between clusters](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210820013008.12881-1-21cnbao@gmail.com) | 第一个系列(series): 让拓扑域感知 cluster 的存在, 在 sysfs 接口中提供 cluster 的信息(包括 id 和 cpumask 等), 并添加 CONFIG_SCHED_CLUSTER, 可以在 cluster 之间实现负载平衡, 从而使大量工作负载受益. 测试表明, 在 Jacobsville 上增加 25.1% 的 SPECrate mcf, 在 kunpeng920 上增加 13.574% 的 mcf. | RFC ☑ [5.16-rc1](https://lore.kernel.org/lkml/163572864855.3357115.17938524897008353101.tglx@xen13/) | [2021/09/20 PatchWork 0/3](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210820013008.12881-1-21cnbao@gmail.com), [2021/09/20 PatchWork RESEND,0/3](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210924085104.44806-1-21cnbao@gmail.com), [LKML](https://lkml.org/lkml/2021/9/24/178), [LWN](https://lwn.net/Articles/866914) |
| 2021/09/20 | Barry Song <song.bao.hua@hisilicon.com> | [scheduler: expose the topology of clusters and add cluster scheduler](https://lore.kernel.org/patchwork/cover/1415806) | 增加了 cluster 层次的 CPU select. 多个架构都是有 CLUSTER 域的概念的, 比如 Kunpeng 920 一个 NODE(DIE) 24个 CPU 分为 8 个 CLUSTER, 整个 DIE 共享 L3 tag, 但是一个 CLUSTER 使用一个 L3 TAG. 这种情况下对于有数据共享的进程, 在一个 cluster 上运行, 通讯的时延更低. | RFC v6 ☐ | [2020/12/01 PatchWork RFC,v2,0/2](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20201201025944.18260-1-song.bao.hua@hisilicon.com)<br>*-*-*-*-*-*-*-* <br>[2021/03/01 PatchWork RFC,v4,0/4](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210301225940.16728-1-song.bao.hua@hisilicon.com)<br>*-*-*-*-*-*-*-* <br>[2021/03/19 PatchWork RFC,v5,0/4](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210319041618.14316-1-song.bao.hua@hisilicon.com)<br>*-*-*-*-*-*-*-* <br>[2021/09/20 PatchWork v6,0/4](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210420001844.9116-1-song.bao.hua@hisilicon.com) |
| 2021/06/15 | Peter Zijlstra | [Represent cluster topology and enable load balance between clusters](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210820013008.12881-1-21cnbao@gmail.com) | 第一个系列(series): 让拓扑域感知 cluster 的存在, 在 sysfs 接口中提供 cluster 的信息(包括 id 和 cpumask 等), 并添加 CONFIG_SCHED_CLUSTER, 可以在 cluster 之间实现负载平衡, 从而使大量工作负载受益. 测试表明, 在 Jacobsville 上增加 25.1% 的 SPECrate mcf, 在 kunpeng920 上增加 13.574% 的 mcf. 但是社区测试在 alder lake 上造成了一定的性能回归, [Linux 5.16's New Cluster Scheduling Is Causing Regression, Further Hurting Alder Lake](https://www.phoronix.com/scan.php?page=article&item=linux-516-regress&num=1), [Windows 11 Better Than Linux Right Now For Intel Alder Lake Performance](https://www.phoronix.com/scan.php?page=article&item=alderlake-windows-linux&num=1) | RFC ☑ [5.16-rc1](https://lore.kernel.org/lkml/163572864855.3357115.17938524897008353101.tglx@xen13/) | [2021/09/20 PatchWork 0/3](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210820013008.12881-1-21cnbao@gmail.com), [2021/09/20 PatchWork RESEND,0/3](https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210924085104.44806-1-21cnbao@gmail.com), [LKML](https://lkml.org/lkml/2021/9/24/178), [LWN](https://lwn.net/Articles/866914) |