The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_pageout.h

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    1 /*-
    2  * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
    3  *
    4  * Copyright (c) 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * The Mach Operating System project at Carnegie-Mellon University.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)vm_pageout.h  8.2 (Berkeley) 1/12/94
   35  *
   36  *
   37  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   38  * All rights reserved.
   39  *
   40  * Author: Avadis Tevanian, Jr.
   41  *
   42  * Permission to use, copy, modify and distribute this software and
   43  * its documentation is hereby granted, provided that both the copyright
   44  * notice and this permission notice appear in all copies of the
   45  * software, derivative works or modified versions, and any portions
   46  * thereof, and that both notices appear in supporting documentation.
   47  *
   48  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   49  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   50  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   51  *
   52  * Carnegie Mellon requests users of this software to return to
   53  *
   54  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   55  *  School of Computer Science
   56  *  Carnegie Mellon University
   57  *  Pittsburgh PA 15213-3890
   58  *
   59  * any improvements or extensions that they make and grant Carnegie the
   60  * rights to redistribute these changes.
   61  *
   62  * $FreeBSD$
   63  */
   64 
   65 #ifndef _VM_VM_PAGEOUT_H_
   66 #define _VM_VM_PAGEOUT_H_
   67 
   68 #ifdef _KERNEL
   69 
   70 /*
   71  *      Header file for pageout daemon.
   72  */
   73 
   74 /*
   75  *      Exported data structures.
   76  */
   77 
   78 extern u_long vm_page_max_user_wired;
   79 extern int vm_pageout_page_count;
   80 
   81 #define VM_OOM_MEM      1
   82 #define VM_OOM_MEM_PF   2
   83 #define VM_OOM_SWAPZ    3
   84 
   85 /*
   86  * vm_lowmem flags.
   87  */
   88 #define VM_LOW_KMEM     0x01
   89 #define VM_LOW_PAGES    0x02
   90 
   91 /*
   92  *      Exported routines.
   93  */
   94 
   95 /*
   96  *      Signal pageout-daemon and wait for it.
   97  */
   98 
   99 void vm_wait(vm_object_t obj);
  100 int vm_wait_intr(vm_object_t obj);
  101 void vm_waitpfault(struct domainset *, int timo);
  102 void vm_wait_domain(int domain);
  103 void vm_wait_min(void);
  104 void vm_wait_severe(void);
  105 
  106 int vm_pageout_flush(vm_page_t *, int, int, int, int *, boolean_t *);
  107 void vm_pageout_oom(int shortage);
  108 
  109 void vm_swapout_run(void);
  110 void vm_swapout_run_idle(void);
  111 
  112 #endif /* _KERNEL */
  113 #endif  /* _VM_VM_PAGEOUT_H_ */

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