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description/debug: psi v2
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Cheng Jian
@@ -174,8 +174,42 @@ Date: Tue Feb 21 16:09:33 2017 +0100
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| 2019/11/21 | Will Deacon <will@kernel.org> | [Rework REFCOUNT_FULL using atomic_fetch_* operations](https://lore.kernel.org/patchwork/cover/1156945) | 通过 atomic_fetch_* 操作来降低 cmpxchg() 带来的性能开销, 从而提升 refcount 机制的性能. | v4 ☑ [5.5-rc1]() | [PatchWork](https://lore.kernel.org/patchwork/cover/1156945) |
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# 6 Load Average
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# 6 PSI
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## 6.1 LTENEX Load Average
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-------
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[Linux Load Averages: 什么是平均负载 ?](https://zhuanlan.zhihu.com/p/75975041)
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Load Averages 是一项历史悠久的指标, 在 1973 年 8 月的 RFC 546 中对 [LTENEX Load Average](https://datatracker.ietf.org/doc/html/rfc546) 有一个很好的描述. 原始的 load averages 仅显示 CPU 需求: 运行的进程数 + 等待运行的进程数.
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## 6.2 Delay accounting
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[Delay accounting](https://www.kernel.org/doc/html/latest/accounting/delay-accounting.html)
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[Utility to get per-pid delay accounting statistics from the kernel using libnl](https://github.com/andrestc/linux-delays)
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[per-task-delay-accounting: add memory reclaim delay](https://lwn.net/Articles/285346)
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[Per-task delay accounting](https://lwn.net/Articles/160123)
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[Patch 0/6 delay accounting & taskstats fixes](http://lkml.iu.edu/hypermail/linux/kernel/0607.1/1005.html)
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## 6.3 memory vmpressure
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| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
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| 2018/08/28 | Johannes Weiner <hannes@cmpxchg.org> | [psi: pressure stall information for CPU, memory, and IO v4](https://lwn.net/Articles/759781) | 引入 PSI 评估系统 CPU, MEMORY, IO 等资源的压力. | v4 ☑ [4.20-rc1](https://kernelnewbies.org/Linux_4.20#Core_.28various.29) | [LWN](https://lwn.net/Articles/544652), [](https://lkml.org/lkml/2013/2/10/140), [关键 commit](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=70ddf637eebe47e61fb2be08a59315581b6d2f38) |
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## 6 PSI
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@@ -190,7 +224,7 @@ Facebook 在 2018 年开源了一套解决重要计算集群管理问题的 Linu
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| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
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| 2018/08/28 | Johannes Weiner <hannes@cmpxchg.org> | [psi: pressure stall information for CPU, memory, and IO v4](https://lwn.net/Articles/759781) | 引入 PSI 评估系统 CPU, MEMORY, IO 等资源的压力. | v4 ☑ [4.20-rc1](https://kernelnewbies.org/Linux_4.20#Core_.28various.29) | [Patchwork](https://lore.kernel.org/patchwork/patch/978495), [Patchwork 0/9](https://patchwork.kernel.org/project/linux-mm/cover/20180828172258.3185-1-hannes@cmpxchg.org) |
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| 2018/08/28 | Johannes Weiner <hannes@cmpxchg.org> | [psi: pressure stall information for CPU, memory, and IO v4](https://lwn.net/Articles/759781) | 引入 PSI 评估系统 CPU, MEMORY, IO 等资源的压力. | v4 ☑ [4.20-rc1](https://kernelnewbies.org/Linux_4.20#Core_.28various.29) | [Patchwork](https://lore.kernel.org/patchwork/patch/978495), [Patchwork 0/9](https://patchwork.kernel.org/project/linux-mm/cover/20180828172258.3185-1-hannes@cmpxchg.org), [关键 commit](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eb414681d5a07d28d2ff90dc05f69ec6b232ebd2) |
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| 2019/03/19 | Suren Baghdasaryan <surenb@google.com> | [psi: pressure stall monitors v6](https://lwn.net/Articles/775971/) | NA | v6 ☑ [5.2-rc1](https://kernelnewbies.org/Linux_5.2#Improved_Presure_Stall_Information_for_better_resource_monitoring) | [Patchwork](https://lore.kernel.org/patchwork/patch/1052413) |
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| 2020/03/03 | Suren Baghdasaryan <surenb@google.com> | [psi: Add PSI_CPU_FULL state and some code optimization](ttps://lore.kernel.org/patchwork/patch/1388805) | 1. 添加 PSI_CPU_FULL 状态标记 cgroup 中的所有非空闲任务在 cgroup 之外的 CPU 资源上被延迟, 或者 cgroup 被 throttle<br>2. 使用 ONCPU 状态和当前的 in_memstall 标志来检测回收, 删除 timer tick 中的钩子, 使代码更简洁和可维护.<br>4. 通过移除两个任务的每个公共cgroup祖先的psi_group_change()调用来优化自愿睡眠开关. | v2 ☑ 5.13-rc1 | [Patchwork](https://lore.kernel.org/patchwork/patch/1388805) |
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| 2020/03/31 | Yafang Shao <laoar.shao@gmail.com> | [psi: enhance psi with the help of ebpf](https://lwn.net/Articles/1218304) | 引入 psi_memstall_type 标记 MEMSTALL 的类别, 并在 tracepoint 输出, 从而可以被 ebpf 使用来增强工具. | v4 ☑ [4.20-rc1](https://kernelnewbies.org/Linux_4.20#Core_.28various.29) | [Patchwork](https://lore.kernel.org/patchwork/patch/1218304) |
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