vm_fault_prefault(9)
NAME
- vm_fault_prefault - cluster page faults into a process's ad
- dress 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
- The vm_fault_prefault() function provides a means of clus
- tering pagefaults into a process's address space. It operates upon the
- physical map
pmap. The entry argument specifies the entry to be pre - faulted; the addra
argument specifies the beginning of the mapping in the pro - cess'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 pro - cess's executable pages into physical memory.
IMPLEMENTATION NOTES
- This is a machine-independent function which calls the ma
- chine-dependent
pmap_is_prefaultable(9) helper function to determine if a - page may be
prefaulted into physical memory.
SEE ALSO
execve(2), pmap_is_prefaultable(9)
AUTHORS
- This manual page was written by Bruce M Simpson
- <bms@spc.org>.
- BSD July 21, 2003