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⟩.