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 PMAP_PAGE_EXISTS_QUICK 9 30.Os 31.Sh NAME 32.Nm pmap_page_exists_quick 33.Nd determine if a page exists in a physical map 34.Sh SYNOPSIS 35.In sys/param.h 36.In vm/vm.h 37.In vm/pmap.h 38.Ft boolean_t 39.Fn pmap_page_exists_quick "pmap_t pmap" "vm_page_t m" 40.Sh DESCRIPTION 41The 42.Fn pmap_page_exists_quick 43function is used to quickly determine if the page 44.Fa m 45exists in the physical map 46.Fa pmap . 47It is typically called from the VM paging code. 48.Sh RETURN VALUES 49The 50.Fn pmap_page_exists_quick 51returns 52.Dv TRUE 53only if the PV entry for the physical map 54.Fa pmap 55is one of the first 16 PVs linked from the page 56.Fa m . 57.Sh IMPLEMENTATION NOTES 58The PV count used above may be changed upwards or downwards in future; 59it is only necessary that 60.Dv TRUE 61be returned for a small subset of pmaps for proper page aging. 62.Sh SEE ALSO 63.Xr pmap 9 64.Sh AUTHORS 65This manual page was written by 66.An Bruce M Simpson Aq bms@spc.org . 67