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Os Linux Documentation
- 7. In early days, Linux development revolved around central OS kernel.
- 9. Is an entirely original piece of SW developed from scratch by the Linux community.
- 11. Some written from scratch, other borrowed from other development projects and other created in collection with other team.
- 14. The first version was written by ken Thompson in assembler for the PDP-7 minicomputer
- 15. This was soon followed by a version for the PDP-11 written in a new language call C that was devised and implemented by Dennis Ritchie
- 21. 1 GB is not visible when running in user mode.
- 22. Linux also uses different linked lists of pages to facilitate an LRU-style algorithm.
- 23. Linux divides physical memory into three "zones:" one for DMA (devices I/0) pages, one for normal pages, and one for dynamically allocated memory.
- 28. Second the paging mechanism carries out the transfer and pages data back into physical memory when they are needed again.
- 29. Linux policy uses modified version of the standard clock (or second chance) algorithm.
- 30. Under Linux a clock is used, and every page has an age that is adjusted on each pass of the clock. Age is measure of youthfulness of pages.