source:Industry News release time:2022-10-18 Article author:yu Popular:pcb
It depends on how to define "PCB", "existence" and "memory". Simply speaking, PCB must only be in memory. There are only two kinds of things that the processor can handle, memory and IO. When the kernel modifies PCB, it must be in the register. Strictly speaking, only part of the PCB is in the register, and it is not the PCB itself, but a copy. (I'm not sure about this one.) Unused memory can be temporarily replaced into the file system. Is this "not in" memory? (PCB, which has a key impact on schedule, should not be replaced?)
The PCBs of each process are stored in the kernel space shared by all processes. The operating system manages the process, that is, the PCBs of all processes are managed in the kernel space through a linked list. If a process is to be created, such a 4G virtual memory is actually allocated, and its own PCBs are added to the two-way linked list in the shared kernel space.
The PCB (Process Control Block) process control block describes the basic information and running state of the process. The creation and destruction of the process are both operations on the PCB. The specific contents of the PCB are as follows
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