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[http://www.ghostpapers.com/term-papers-site/college-term-papers.html college term paper]
* ''private mapping'' — this includes the following types of mappings:
** writable anonymous mappings
** writable private file mappings
: Both types are not backed by disk file and thus may not be just freed. These mappings are charged with possible reject right when they are made — in <code>sys_mmap()</code>/<code>sys_brk()</code>.