1 /* 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * The Mach Operating System project at Carnegie-Mellon University. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)vm_pageout.h 8.2 (Berkeley) 1/12/94 37 * 38 * 39 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 40 * All rights reserved. 41 * 42 * Author: Avadis Tevanian, Jr. 43 * 44 * Permission to use, copy, modify and distribute this software and 45 * its documentation is hereby granted, provided that both the copyright 46 * notice and this permission notice appear in all copies of the 47 * software, derivative works or modified versions, and any portions 48 * thereof, and that both notices appear in supporting documentation. 49 * 50 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 51 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 52 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 53 * 54 * Carnegie Mellon requests users of this software to return to 55 * 56 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 57 * School of Computer Science 58 * Carnegie Mellon University 59 * Pittsburgh PA 15213-3890 60 * 61 * any improvements or extensions that they make and grant Carnegie the 62 * rights to redistribute these changes. 63 * 64 * $Id: vm_pageout.h,v 1.16 1995/11/20 12:19:22 phk Exp $ 65 */ 66 67 #ifndef _VM_VM_PAGEOUT_H_ 68 #define _VM_VM_PAGEOUT_H_ 69 70 /* 71 * Header file for pageout daemon. 72 */ 73 74 /* 75 * Exported data structures. 76 */ 77 78 extern int vm_page_max_wired; 79 extern int vm_pages_needed; /* should be some "event" structure */ 80 extern int vm_pageout_pages_needed; 81 82 #define VM_PAGEOUT_ASYNC 0 83 #define VM_PAGEOUT_SYNC 1 84 #define VM_PAGEOUT_FORCE 2 85 86 /* 87 * Exported routines. 88 */ 89 90 /* 91 * Signal pageout-daemon and wait for it. 92 */ 93 94 static void pagedaemon_wakeup __P((void)); 95 static inline void 96 pagedaemon_wakeup() 97 { 98 if (!vm_pages_needed && curproc != pageproc) { 99 vm_pages_needed++; 100 wakeup(&vm_pages_needed); 101 } 102 } 103 104 #define VM_WAIT vm_wait() 105 106 static void vm_wait __P((void)); 107 static inline void 108 vm_wait() 109 { 110 int s; 111 112 s = splhigh(); 113 if (curproc == pageproc) { 114 vm_pageout_pages_needed = 1; 115 tsleep(&vm_pageout_pages_needed, PSWP, "vmwait", 0); 116 } else { 117 if (!vm_pages_needed) { 118 vm_pages_needed++; 119 wakeup(&vm_pages_needed); 120 } 121 tsleep(&cnt.v_free_count, PVM, "vmwait", 0); 122 } 123 splx(s); 124 } 125 126 127 #ifdef KERNEL 128 void vm_pageout_page __P((vm_page_t, vm_object_t)); 129 void vm_pageout_cluster __P((vm_page_t, vm_object_t)); 130 int vm_pageout_flush __P((vm_page_t *, int, int)); 131 132 #endif 133 134 #endif 135