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