DirtyBit
DirtyBit, commonly referred to as the dirty bit, is a flag used in computer systems to indicate that a data unit has been modified since it was last written to its backing store. It is a core concept in memory hierarchy management and is used to optimize input/output by avoiding unnecessary writes.
In CPU caches and memory, the dirty bit is set when a processor writes to a cache
In virtual memory and operating systems, the dirty bit can be part of page table entries to
In file systems and buffer management, dirty bits mark memory buffers or blocks that contain unsynced data.
Despite variations in implementation, the dirty bit remains a fundamental concept for coordinating when data must