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This article mainly introduces the Linux memory monitoring virtual memory implementation mechanism and capacity setting example analysis, the article is very detailed, has a certain reference value, interested friends must read it!

In the address mapping, physical pages should be found through TLB (translation backup memory); exchange cache should also be used in the exchange mechanism, and the page table should be modified to map the document address after swapping the physical page content into the exchange document.

(1) Linux memory monitoring virtual memory implementation mechanism

The implementation of Linux memory monitoring Linux virtual memory needs the support of six mechanisms: address mapping mechanism, memory allocation recovery mechanism, cache and refresh mechanism, request page mechanism, exchange mechanism, memory sharing mechanism.

First of all, the memory management program maps the logical address of the user program to the physical address through the mapping mechanism, and when the user program is running, if it finds that the virtual address to be used in the program does not have the corresponding physical memory, the request page needs If there is free memory to allocate, request the allocation of memory (hence memory allocation and recycling) and record the physical pages in use in the cache (using the caching mechanism). If there is not enough memory to allocate, the swap mechanism is called to free up some memory. In addition, physical pages should be found through TLB (translation backup memory) in address mapping; exchange cache should also be used in the exchange mechanism, and the page table should be modified to map the document address after swapping the physical page content into the exchange document.

(2) Linux memory monitoring virtual memory capacity setting

Someone may tell you that virtual memory should be allocated twice as much as physical memory, but this is not a fixed rule. If your physical save is relatively small, you can set it this way. If you have 1 gigabyte of physical memory or more, you can shrink the virtual memory. Linux uses a lot of memory for Cache, but it is recycled when resources are tight. As long as you see that the swap is 0 or very small, you can rest assured, because it is a waste of storage that it is not used.

The above is all the contents of the article "example Analysis of Linux memory Monitoring Virtual memory implementation Mechanism and capacity setting". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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