January 2004
Intermediate to advanced
432 pages
11h 1m
English
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The Kernel View: The Hashtable
The name pdir is a bit of a throwback. Originally, HP-UX used an inverse page directory that mapped physical page numbers to virtual page numbers. This meant that while the size of the table was easy to determine (simply one entry for each page), searching for a specific virtual address was a lengthy process. To reduce search times, a hashed table of virtual addresses was created. In this format, a virtual page address is used to create a hashtable index value. The index is then tested against a mask value to make sure the index doesn't exceed the size of the hashtable, and the result is used as an offset into the htbl (or htbl2_0).
The hashing algorithm varies according to the hardware width. For a narrow system, ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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