For the Black Eyed Peas song, see The Time (Dirty Bit).
A dirty bit or modified bit is a bit that is associated with a block of computer memory and indicates whether the corresponding block of memory has been modified.[1] The dirty bit is set when the processor writes to (modifies) this memory. The bit indicates that its associated block of memory has been modified and has not been saved to storage yet. When a block of memory is to be replaced, its corresponding dirty bit is checked to see if the block needs to be written back to secondary memory before being replaced or if it can simply be removed. Dirty bits are used by the CPU cache and in the page replacement algorithms of an operating system.
Dirty bits can also be used in Incremental computing by marking segments of data that need to be processed or have yet to be processed. This technique can be used with delayed computing to avoid unnecessary processing of objects or states that have not changed. When the model is updated (usually by multiple sources), only the segments that need to be reprocessed will be marked dirty. Afterwards, an algorithm will scan the model for dirty segments and process them, marking them as clean. This ensures the unchanged segments are not recalculated and saves processor time.
^Laplante, Philip A. (2001). Dictionary of Computer Science, Engineering, and Technology. CRC Press. p. 138. ISBN 0-8493-2691-5.
A dirtybit or modified bit is a bit that is associated with a block of computer memory and indicates whether the corresponding block of memory has been...
also auxiliary information about the page such as a present bit, a dirty or modified bit, address space or process ID information, amongst others. Secondary...
mixed reviews. The album's first single release was called "The Time (DirtyBit)", and was revealed on October 20, 2010, through will.i.am's Twitter account...
about whether the page has been written to (the dirtybit), when it was last used (the accessed bit, for a least recently used (LRU) page replacement...
the page table holds an "access" bit and a "dirty" bit for each page in the page table. The CPU sets the access bit when the process reads or writes memory...
Beginning, in November 2010. The first single from the album, "The Time (DirtyBit)", reached number 1 on the UK Singles Chart on December 12. The second...
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the system disk in the normal system mode. Instead, the system sets a dirtybit to the disk volume and then reboots the computer. During the Windows start-up...
requires one fewer tag bit to support the same cacheable memory size. The leftover tag bit is instead used to store the cache line dirtybit, and all 16 Kbits...
access flag, and the standardization of an optional, hardware updated, dirtybit mechanism. The Virtualization Host Extensions (VHE). These enhancements...
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evicted. A "dirtybit" is attached to each cache block and set whenever the cache block is modified. During eviction, blocks with a set dirtybit will be...
(Usher & will.i.am) "Where Is The Love?" (The Black Eyed Peas) "The Time (DirtyBit)" with "I Gotta Feeling" reprise (The Black Eyed Peas) XLVI (show) February...
Gold" by Jamie 30 0 440 250 720 1Million "SexyBack" by Justin Timberlake "The Time (DirtyBit)" by Black Eyed Peas "EZ" by Jvcki Wai 0 70 410 440 920...
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