NAME
vm_fault_prefault —
cluster page faults into a process's
address space
SYNOPSIS
#include
<sys/param.h>
#include <vm/vm.h>
#include <vm/pmap.h>
void
vm_fault_prefault(pmap_t
pmap, vm_offset_t
addra, vm_map_entry_t
entry);
DESCRIPTION
Thevm_fault_prefault()
function provides a means of clustering pagefaults into a process's address
space. It operates upon the physical map pmap. The
entry argument specifies the entry to be prefaulted; the
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_prefaultable(9) helper function to determine if a page may be prefaulted into physical memory.
SEE ALSO
AUTHORS
This manual page was written by Bruce M Simpson <bms@spc.org>.