October 2000
Intermediate to advanced
704 pages
18h 44m
English
Content preview from Solaris™ Internals: Core Kernel ComponentsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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5.5. Anonymous Memory
At many points we have mentioned anonymous memory. Anonymous memory refers to pages that are not directly associated with a vnode. Such pages are used for a process's heap space, its stack, and copy-on-write pages. In the Solaris kernel, two subsystems are dedicated to managing anonymous memory: the anon layer and the swapfs file system.
The anonymous memory allocated to the heap of a process is a result of a zero-fill-on-demand operation (ZFOD). The ZFOD operation is how we allocate new pages. A ZFOD occurs when we touch a memory address for the first time, and a new page of memory is dynamically allocated at that address. ZFOD is the allocation method used for the heap space and segments created as a map of /dev/zero
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