1.\" 2.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd July 21, 2003 29.Dt VM_FAULT_PREFAULT 9 30.Os 31.Sh NAME 32.Nm vm_fault_prefault 33.Nd cluster page faults into a process's address space 34.Sh SYNOPSIS 35.In sys/param.h 36.In vm/vm.h 37.In vm/pmap.h 38.Ft void 39.Fn vm_fault_prefault "pmap_t pmap" "vm_offset_t addra" "vm_map_entry_t entry" 40.Sh DESCRIPTION 41The 42.Fn vm_fault_prefault 43function provides a means of clustering pagefaults into a process's 44address space. 45It operates upon the physical map 46.Fa pmap . 47The 48.Fa entry 49argument specifies the entry to be prefaulted; the 50.Fa addra 51argument specifies the beginning of the mapping in the process's virtual 52address space. 53.Pp 54It is typically called by 55.Fn vm_fault 56after the first page fault. 57It benefits the 58.Xr execve 2 59system call by eliminating repetitive calls to 60.Fn vm_fault , 61which would otherwise be made to bring the process's executable pages 62into physical memory. 63.Sh IMPLEMENTATION NOTES 64This is a machine-independent function which calls the machine-dependent 65.Xr pmap_is_prefaultable 9 66helper function to determine if a page may be prefaulted into physical memory. 67.Sh SEE ALSO 68.Xr execve 2 , 69.Xr pmap_is_prefaultable 9 70.Sh AUTHORS 71This manual page was written by 72.An Bruce M Simpson Aq Mt bms@spc.org . 73