Question

What is a dirty page in operating system?

Answer 1

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A dirty bit or modified bit is a bit that is associated with a block of computer memory and indicates whether or not the corresponding block of memory has been modified. ... Dirty bits are used by the CPU cache and in the page replacement algorithms of an operating system.
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Answer 2

Dirty page in Linux operating system:

• Dirty pages are the pages in memory (page cache) that have been rationalized and consequently have changed from what is currently stored on disk. This usually happens when an existing file on the disk is altered or appended.

• Page store on a Linux system is the area where file system based I/O is cached and that these settings affect how the cache is exploited by the kernel.

• Dirty bits are used by the central processing unit cache and in the page replacement algorithms of an operating system.

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