Hi  Yinghao,

Here are some detail information provided by Yihao.


1. Implement the lastest version of CPU SLI feature (Sevice Level Index) for rich container;
   this new version show great advantages in performance and accuracy.
   
   The CPU SLI features isolate CPU runtime metrics for rich container users. It allows users
   to use commands like `top` or read pseduo files like /proc/loadavg in a container, and get
   the expected information, just as if they do in a traditional virtual machine.

   CPU SLI features have evolved several versions. The latest version overcame left bugs, and
   it achieved both great stability and accuracy.
    
   For now it covers these metrics.
   * CPU usage (usr%, nice%, sys%, idle%, steal%, iowait%, irq%, softirq%, guest%）
   * 1/5/15 load accounting
   * 1/5/15 running load accounting (meaning uninterruptible excluded)
   * nr_running, nr_uninterruptible, nr_migration
   * sched latency histogram

2. Design and implement cpu isolation solution for function computing running on Daishu, which
   enable 2000 microvm running on one machine which acceptable overhead (< 1%).

   Dynamic load tracking contributes most of the overhead, especially considering that enormous
   2000 microvms expand a both wide and deep group scheduling tree. Yihao managed to minimalize
   both cgroup hierarchy and dynamic load tracking, to limit the overhead of scheduling those
   microvms to less than 1%.


3. The core develper in plugsched project, which aims to upgrade linux kernel scheduler subsystem online.
   more details please visit project repo: https://gitee.com/anolis/plugsched

4. Backport cpuidle-haltpoll feature to ANCK and optimize performance for virtual machine.

   Guest haltpoll is a relatively novel technique (at that time Yihao backports it). And he made it
   enabled widely both on Aliyun ECS and in Alibaba Corp.

   Also on Aliyun ECS, he oberserved and tackled a poorly performed locking problem, that qspinlock
   was not enabled at all. This problem dates back long. At that time he solved this problem. The same
   problem still persists on Amazon EC2.

5. Proficient in problem analysis, be skilled using gdb, crash, pyGDB, qemu ...
   https://lore.kernel.org/all/20220428103726.108597-1-wuyihao@linux.alibaba.com/T/



-- csp

congrats .expecting more informative materaial from you。

---

谢英豪 18512581128 苏宁易购集团股份有限公司 IT总部苏宁云BU基础云研发中心Iaas研发中心计算及内核研发部

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---

----邮件原文----

发件人:Xunlei Pang

发件时间:2022-05-18 10:29:30

收件人:Shanpei Chen <shanpeic@linux.alibaba.com>,cloud-kernel <cloud-kernel@lists.openanolis.cn>,Michael Wang <yun.wang@linux.alibaba.com>,Artie Ding <artie.ding@linux.alibaba.com>,Gang Deng <gavin.dg@linux.alibaba.com>,Yihao Wu <wuyihao@linux.alibaba.com>

主题 :[ck] Re: Add Yihao Wu as scheduler's maintainer

在 2022/5/16 下午6:08, Shanpei Chen 写道:
> Hi, all
>
>
> I'm glad to invide Yihao Wu   as maintainer
> of ANCK scheduler.
> Yihao is working on linux kernel scheduler for 5 years, and show great
> interest in kernel technologies.
>
> Here are some highlight contributions from Yihao:
>
> 1. Implement the lastest version of CPU SLI feature (Sevice Level Index)
> for rich container;
>    this new version show great advantages in performance and accuracy.
>
> 2. Design and implement cpu isolation solution for function computing
> running on Daishu, which
>    enable 2000 microvm running on one machine which acceptable overhead
> (< 1%).
>
> 3. The core develper in plugsched project, which aims to upgrade linux
> kernel scheduler subsystem online.
>    more details please visit project repo:
> https://gitee.com/anolis/plugsched
>
> 4. Backport cpuidle-haltpoll feature to ANCK and optimize performance
> for virtual machine.
>
> 5. Proficient in problem analysis, be skilled using gdb, crash, pyGDB,
> qemu ...
> https://lore.kernel.org/all/20220428103726.108597-1-wuyihao@linux.alibaba.com/T/
>
>
>
> Working with Yihao is efficient and have a sense of achievement. Let us
> hope it happens soon.
>
>
> -- csp

Yihao has been working on scheduler for many years, he strikes me as a
very careful and skilled kernel geek, I believe he will do even better
under this new responsiblity:
Acked-by: Xunlei Pang
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