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. 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: src/sys/vm/vm_pageout.h,v 1.26.2.1 2002/02/26 05:49:28 silby Exp $
  61  * $DragonFly: src/sys/vm/vm_pageout.h,v 1.8 2008/07/01 02:02:56 dillon Exp $
  62  */
  63
  64 #ifndef _VM_VM_PAGEOUT_H_
  65 #define _VM_VM_PAGEOUT_H_
  66
  67 #ifndef _VM_VM_PAGE_H_
  68 #include <vm/vm_page.h>
  69 #endif
  70
  71 /*
  72  *      Header file for pageout daemon.
  73  */
  74
  75 /*
  76  *      Exported data structures.
  77  */
  78
  79 extern int vm_page_max_wired;
  80 extern int vm_pages_needed;     /* should be some "event" structure */
  81 extern int vm_pageout_pages_needed;
  82 extern int vm_pageout_deficit;
  83 extern int vm_page_free_hysteresis;
  84 extern int vm_pageout_memuse_mode;
  85
  86 #define VM_PAGEOUT_ASYNC 0
  87 #define VM_PAGEOUT_SYNC 1
  88 #define VM_PAGEOUT_FORCE 2
  89
  90 /*
  91  * Swap out requests
  92  */
  93 #define VM_SWAP_NORMAL 1
  94 #define VM_SWAP_IDLE 2
  95
  96 /*
  97  *      Exported routines.
  98  */
  99
 100 /*
 101  *      Signal pageout-daemon and wait for it.
 102  */
 103
 104 extern void pagedaemon_wakeup (void);
 105 extern void vm_wait (int timo);
 106 extern void vm_wait_pfault (void);
 107
 108 #ifdef _KERNEL
 109 void vm_pageout_cluster (vm_page_t, vm_object_t);
 110 int vm_pageout_flush (vm_page_t *, int, int);
 111 int vm_pageout_clean (vm_page_t);
 112 void vm_pageout_map_deactivate_pages(vm_map_t map, vm_pindex_t limit);
 113
 114 #endif
 115
 116 #endif  /* _VM_VM_PAGEOUT_H_ */