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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)vm_pageout.h 8.2 (Berkeley) 1/12/94 33 * 34 * 35 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 36 * All rights reserved. 37 * 38 * Author: Avadis Tevanian, Jr. 39 * 40 * Permission to use, copy, modify and distribute this software and 41 * its documentation is hereby granted, provided that both the copyright 42 * notice and this permission notice appear in all copies of the 43 * software, derivative works or modified versions, and any portions 44 * thereof, and that both notices appear in supporting documentation. 45 * 46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 49 * 50 * Carnegie Mellon requests users of this software to return to 51 * 52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 53 * School of Computer Science 54 * Carnegie Mellon University 55 * Pittsburgh PA 15213-3890 56 * 57 * any improvements or extensions that they make and grant Carnegie the 58 * rights to redistribute these changes. 59 * 60 * $FreeBSD$ 61 */ 62 63 #ifndef _VM_VM_PAGEOUT_H_ 64 #define _VM_VM_PAGEOUT_H_ 65 66 /* 67 * Header file for pageout daemon. 68 */ 69 70 /* 71 * Exported data structures. 72 */ 73 74 extern int vm_page_max_wired; 75 extern int vm_pageout_deficit; 76 extern int vm_pageout_page_count; 77 extern bool vm_pageout_wanted; 78 extern bool vm_pages_needed; 79 80 #define VM_OOM_MEM 1 81 #define VM_OOM_SWAPZ 2 82 83 /* 84 * vm_lowmem flags. 85 */ 86 #define VM_LOW_KMEM 0x01 87 #define VM_LOW_PAGES 0x02 88 89 /* 90 * Exported routines. 91 */ 92 93 /* 94 * Signal pageout-daemon and wait for it. 95 */ 96 97 extern void pagedaemon_wakeup(void); 98 #define VM_WAIT vm_wait() 99 #define VM_WAITPFAULT vm_waitpfault() 100 extern void vm_wait(void); 101 extern void vm_waitpfault(void); 102 103 #ifdef _KERNEL 104 int vm_pageout_flush(vm_page_t *, int, int, int, int *, boolean_t *); 105 void vm_pageout_oom(int shortage); 106 107 void vm_swapout_run(void); 108 void vm_swapout_run_idle(void); 109 #endif 110 #endif /* _VM_VM_PAGEOUT_H_ */ 111