An easy way to troubleshoot paging kernel issues

September 29, 2020 by Anthony Middleton


You should check these fixing methods if you get a "Swap kernel" error message on your computer.

Writing pages to your hard drive into free space is called paging. If a page error subsequently occurs because the page is on disk, in swap space and not in memory, the kernel reads the page from disk and corrects the page error. This is an exchange.



Swap was introduced for hard disk backup unassigned pages. From the previous discussion, we know that there is Three types of pages to manage while sharing Subsystem:

How does Linux swap work?

Linux divides its physical RAM (random access memory) into memory cores called pages. Swap is the process of copying a page from memory to a preconfigured space on your hard disk called paging space to free that page.

As with paging on demand, the exchange should be transparent to programs. in In other words, there is no need to have a specific trading instruction. inserted into the code. To understand how to do this, remember section " Normal Pagination "in chapter 2 that each page table entry contains the Present flag. The kernel uses this indicator signal that a page belonging to the process's address space has been replaced out. In addition to this flag, Linux also uses the remaining bits Page table entries to save the "replaced page" identify ", which encodes the location of the page on disk. When a page error exception occurs, the corresponding exception handler can Detect that the page does not exist in RAM and call the appropriate function replaceable missing page on the hard disk.

swap kernel







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