man.bsd.lv manual page server

Manual Page Search Parameters

VM_FAULT_PREFAULT(9) Kernel Developer's Manual VM_FAULT_PREFAULT(9)

vm_fault_prefaultcluster page faults into a process's address space

#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);

The () 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 () 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.

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.

execve(2), pmap_is_prefaultable(9)

This manual page was written by Bruce M Simpson <bms@spc.org>.

July 21, 2003 FreeBSD-12.0