vm_page_lookup(9) [freebsd man page]

VM_PAGE_LOOKUP(9)					   BSD Kernel Developer's Manual					 VM_PAGE_LOOKUP(9)

NAME

     vm_page_lookup -- lookup a vm page

SYNOPSIS

     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_page.h>

     vm_page_t
     vm_page_lookup(vm_object_t object, vm_pindex_t pindex);

DESCRIPTION

     The vm_page_lookup() function searches for a VM page given its VM object and index.  If the page is not found, NULL is returned.  Its argu-
     ments are:

     object  The VM object to search on.

     pindex  The page index to search on.

RETURN VALUES

     A vm_page_t is returned if successful; otherwise, NULL is returned.

AUTHORS

     This manual page was written by Chad David <davidc@acns.ab.ca>.

BSD
								   July 13, 2001							       BSD

VM_PAGE_INSERT(9)					   BSD Kernel Developer's Manual					 VM_PAGE_INSERT(9)

NAME

     vm_page_insert, vm_page_remove -- add/remove page from an object

SYNOPSIS

     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_page.h>

     void
     vm_page_insert(vm_page_t m, vm_object_t object, vm_pindex_t pindex);

     void
     vm_page_remove(vm_page_t m);

DESCRIPTION

     The vm_page_insert() function adds a page to the given object at the given index.	The page is added to both the VM page hash table and to
     the object's list of pages, but the hardware page tables are not updated.	In the case of a user page, it will be faulted in when it is
     accessed.	If the page is a kernel page, the caller is expected to handle adding the page to the kernel's pmap.

     If PG_WRITEABLE is set in the page's flags, OBJ_WRITEABLE and OBJ_MIGHTBEDIRTY are set in the object's flags.

     The vm_page_remove() function removes the given page from its object, and from the VM page hash table.  The page must be busy prior to this
     call, or the system will panic.  The pmap entry for the page is not removed by this function.

     The arguments to vm_page_insert() are:

     m	     The page to add to the object.

     object  The object the page should be added to.

     pindex  The index into the object the page should be at.

     The arguments to vm_page_remove() are:

     m	The page to remove.

IMPLEMENTATION NOTES

     The index of a page in a VM object is the byte index into the same object truncated to a page boundary.  For example, if the page size is
     4096 bytes, and the address in the object is 81944, the page index is 20.

AUTHORS

     This manual page was written by Chad David <davidc@acns.ab.ca>.

BSD
								   July 17, 2001							       BSD