diff --git a/study/kernel/00-DESCRIPTION/DEBUGGING.md b/study/kernel/00-DESCRIPTION/DEBUGGING.md
index 984caf7..de7863e 100644
--- a/study/kernel/00-DESCRIPTION/DEBUGGING.md
+++ b/study/kernel/00-DESCRIPTION/DEBUGGING.md
@@ -185,6 +185,7 @@ 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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 | 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) |
 | 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) |
+| 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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