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28 .\" @(#)mincore.2 8.1 (Berkeley) 6/9/93
36 .Nd determine residency of memory pages
42 .Fn mincore "const void *addr" "size_t len" "char *vec"
46 system call determines whether each of the pages in the region beginning at
51 .\"The beginning address,
53 .\"is first rounded down to a multiple of the page size (see
54 .\".Xr getpagesize 3 ) .
56 .\".Fa addr No + Fa len ,
57 .\"is rounded up to a multiple of the page size.
58 The status is returned in the
60 array, one character per page.
61 Each character is either 0 if the page is not resident, or a combination of
62 the following flags (defined in
64 .Bl -tag -width ".Dv MINCORE_REFERENCED_OTHER"
66 Page is in core (resident).
67 .It Dv MINCORE_REFERENCED
68 Page has been referenced by us.
69 .It Dv MINCORE_MODIFIED
70 Page has been modified by us.
71 .It Dv MINCORE_REFERENCED_OTHER
72 Page has been referenced.
73 .It Dv MINCORE_MODIFIED_OTHER
74 Page has been modified.
76 Page is part of a "super" page. (only i386 & amd64)
79 The information returned by
81 may be out of date by the time the system call returns.
82 The only way to ensure that a page is resident is to lock it into memory
91 system call will fail if:
94 The virtual address range specified by the
98 arguments is not fully mapped.
102 argument points to an illegal address.
114 system call first appeared in