The
vm_fault_prefault ();
function provides a means of clustering pagefaults into a process's
address space.
It operates upon the physical map
Fa pmap .
The
Fa entry
argument specifies the entry to be prefaulted; the
Fa addra
argument specifies the beginning of the mapping in the process's virtual
address space.
It is typically called by
vm_fault ();
after the first page fault.
It benefits the
execve(2)
system call by eliminating repetitive calls to
vm_fault (,);
which would otherwise be made to bring the process's executable pages
into physical memory.
IMPLEMENTATION NOTES
This is a machine-independent function which calls the machine-dependent
pmap_is_prefaultable9
helper function to determine if a page may be prefaulted into physical memory.
