Record an interview

An interview was arranged in the afternoon , It's been about an hour , Mainly based on the other party's resume , There are also some comprehensive requirements on our side , Let's sort out the questions of the interview questions at that time .

• Self introduction. （ It's basically a fixed process ）

• Project introduction on resume

• VMM（ Virtual machine monitor ） How to switch between the safe world and the non safe world ？（ I mentioned it in my introduction hyper-v）

• A brief introduction  Linux The startup process of the kernel

• Briefly introduce the hardware from power on to os The process of starting .

• TLB What is the function and principle of

• MMU What functions are completed ？

• Two separate processes A and B, Why? A Will not inadvertently destroy B Memory data for ？

• Why will the operating system not be interrupted in the early stage of startup ？

• TCP Three handshakes .

• There is one web The server , When the browser accesses, the state is always pendding, So doubt server There are deadlocks or loops , Briefly describe the troubleshooting method .

• ping On which floor does the command work ？

• gdb Some common commands of , How to view the call chain information of a thread ？

• Common design patterns

• Suppose there are two modules , A module is responsible for logging , Another module is responsible for alarm . The log will generate an alarm of insufficient disk space , The alarm module will also use logs to record alarm information . How to design such interdependent modules to reduce the coupling between modules ？

• Introduce the middle order traversal of binary tree

• For a binary search tree , Are the nodes obtained by traversal in middle order still ordered ？

• Time complexity of quick sorting

• The Internet io What is the difference between synchronous and asynchronous ？

• poll return -1, It must be fd Is there a mistake ？

• Linux What are the modes of interprocess communication ？

• The process address space isolation mentioned earlier , So how does shared memory break this isolation ？

• TCP and UDP Advantages and disadvantages

• A brief introduction TLS The purpose and method of using

• docker Two important technologies are used in the process of containerization , One is for resource isolation , The other is for resource quotas , Briefly introduce these two technologies

• k8s Do you know ？

• Linux There are some modules in the system that can be compiled with the kernel , It can also be compiled into ko Dynamic loading , Briefly describe the advantages and disadvantages of the two methods .

• A brief introduction at linux x86_64 Next c The calling process of language functions , How stack space changes ？

• The operating system uses system calls to open kernel functions to applications , What are the benefits of doing so ？

• Briefly introduce the signal processing flow

• Has Xie Cheng ever known ？

• Difference between process and thread

• In a multithreaded program , If the main thread exits , Is it possible for the process to continue to survive ？

• Fork Can the child process directly use the fd？

• For a multithreaded program , In one of the threads fork, Whether the number of threads in the child process is the same as that in the parent process ？

• Why do you want to leave your last company ？ Can you accept our overtime ？ Have you settled here ？ What was the rating of the company in the past ？ Is the current status of on-the-job or resignation ？ If our company sends you offer How long does it take to start ？

• About our company , Is there anything you want to know ？