sys/vm/vm_pageout.h

   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  * $FreeBSD: src/sys/vm/vm_pageout.h,v 1.26.2.1 2002/02/26 05:49:28 silby Exp $
  65  * $DragonFly: src/sys/vm/vm_pageout.h,v 1.7 2006/05/20 02:42:15 dillon Exp $
  66  */
  67
  68 #ifndef _VM_VM_PAGEOUT_H_
  69 #define _VM_VM_PAGEOUT_H_
  70
  71 #ifndef _VM_VM_PAGE_H_
  72 #include <vm/vm_page.h>
  73 #endif
  74
  75 /*
  76  *      Header file for pageout daemon.
  77  */
  78
  79 /*
  80  *      Exported data structures.
  81  */
  82
  83 extern int vm_page_max_wired;
  84 extern int vm_pages_needed;     /* should be some "event" structure */
  85 extern int vm_pageout_pages_needed;
  86 extern int vm_pageout_deficit;
  87 extern int vm_load;
  88 extern int vm_load_enable;
  89 extern int vm_load_debug;
  90
  91 #define VM_PAGEOUT_ASYNC 0
  92 #define VM_PAGEOUT_SYNC 1
  93 #define VM_PAGEOUT_FORCE 2
  94
  95 /*
  96  * Swap out requests
  97  */
  98 #define VM_SWAP_NORMAL 1
  99 #define VM_SWAP_IDLE 2
 100
 101 /*
 102  *      Exported routines.
 103  */
 104
 105 /*
 106  *      Signal pageout-daemon and wait for it.
 107  */
 108
 109 extern void pagedaemon_wakeup (void);
 110 extern void vm_wait (void);
 111 extern void vm_waitpfault (void);
 112
 113 #ifdef _KERNEL
 114 void vm_pageout_page (vm_page_t, vm_object_t);
 115 void vm_pageout_cluster (vm_page_t, vm_object_t);
 116 int vm_pageout_flush (vm_page_t *, int, int);
 117 void vm_pageout_page_free (vm_page_t);
 118
 119 #endif
 120
 121 #endif  /* _VM_VM_PAGEOUT_H_ */