I saw a Q&A on Zhihu.com titled “What level does being ‘familiar with the Linux operating system’ generally refer to?” The content of the answer comes from Brendan Gregg, a performance expert in Linux, and is based on his personal blog and technical books. His work not only covers system performance monitoring and analysis but also delves deeply into the root causes of performance issues and their solutions.

His illustrations are outstanding; here is an excerpt of one of the images:

**Reference