The
vm_page_grab()
function returns the page at
pindex
from the given object.
If the page exists and is busy,
vm_page_grab()
will sleep while waiting for it.
If the page does not exist, it is allocated.
The function sleeps until the allocation request can be satisfied.
The function requires the
object
to be locked on entry, and returns with the object locked.
If the
vm_page_grab()
function sleeps for any reason, the object lock is temporary dropped.
The
vm_page_grab()
supports all of the flags supported by
vm_page_alloc(9).
In addition,
vm_page_grab()
supports the following flags:
|
| VM_ALLOC_IGN_SBUSY
|
| |
When waiting for the busy state of the existing page to drain,
only test for exclusive busy; ignore the shared busy counter.
|
|
