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  * 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  * 4. 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 #ifdef _KERNEL
   67 
   68 /*
   69  *      Header file for pageout daemon.
   70  */
   71 
   72 /*
   73  *      Exported data structures.
   74  */
   75 
   76 extern int vm_page_max_wired;
   77 extern int vm_pageout_deficit;
   78 extern int vm_pageout_page_count;
   79 extern bool vm_pageout_wanted;
   80 extern bool vm_pages_needed;
   81 
   82 #define VM_OOM_MEM      1
   83 #define VM_OOM_SWAPZ    2
   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 pagedaemon_wait(int pri, const char *wmesg);
  100 void pagedaemon_wakeup(void);
  101 #define VM_WAIT vm_wait()
  102 #define VM_WAITPFAULT vm_waitpfault()
  103 void vm_wait(void);
  104 void vm_waitpfault(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 #endif /* _KERNEL */
  112 #endif  /* _VM_VM_PAGEOUT_H_ */

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