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/uvm/uvm_anon.h

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    1 /*      $NetBSD: uvm_anon.h,v 1.17 2004/05/05 11:54:32 yamt Exp $       */
    2 
    3 /*
    4  *
    5  * Copyright (c) 1997 Charles D. Cranor and Washington University.
    6  * All rights reserved.
    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 Charles D. Cranor and
   19  *      Washington University.
   20  * 4. The name of the author may not be used to endorse or promote products
   21  *    derived from this software without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #ifndef _UVM_UVM_ANON_H_
   36 #define _UVM_UVM_ANON_H_
   37 
   38 /*
   39  * uvm_anon.h
   40  */
   41 
   42 /*
   43  * anonymous memory management
   44  *
   45  * anonymous virtual memory is short term virtual memory that goes away
   46  * when the processes referencing it go away.    an anonymous page of
   47  * virtual memory is described by the following data structure:
   48  */
   49 
   50 struct vm_anon {
   51         int an_ref;                     /* reference count [an_lock] */
   52         struct simplelock an_lock;      /* lock for an_ref */
   53         union {
   54                 struct vm_anon *an_nxt; /* if on free list [afreelock] */
   55                 struct vm_page *an_page;/* if in RAM [an_lock] */
   56         } u;
   57         int an_swslot;          /* drum swap slot # (if != 0)
   58                                    [an_lock.  also, it is ok to read
   59                                    an_swslot if we hold an_page PG_BUSY] */
   60 };
   61 
   62 /*
   63  * a pool of vm_anon data structures is allocated and put on a global
   64  * free list at boot time.  vm_anon's on the free list use "an_nxt" as
   65  * a pointer to the next item on the free list.  for active vm_anon's
   66  * the data can be in one of the following state: [1] in a vm_page
   67  * with no backing store allocated yet, [2] in a vm_page with backing
   68  * store allocated, or [3] paged out to backing store (no vm_page).
   69  *
   70  * for pageout in case [2]: if the page has been modified then we must
   71  * flush it out to backing store, otherwise we can just dump the
   72  * vm_page.
   73  */
   74 
   75 /*
   76  * anons are grouped together in anonymous memory maps, or amaps.
   77  * amaps are defined in uvm_amap.h.
   78  */
   79 
   80 /*
   81  * processes reference anonymous virtual memory maps with an anonymous
   82  * reference structure:
   83  */
   84 
   85 struct vm_aref {
   86         int ar_pageoff;                 /* page offset into amap we start */
   87         struct vm_amap *ar_amap;        /* pointer to amap */
   88 };
   89 
   90 /*
   91  * the offset field indicates which part of the amap we are referencing.
   92  * locked by vm_map lock.
   93  */
   94 
   95 #ifdef _KERNEL
   96 
   97 /*
   98  * prototypes
   99  */
  100 
  101 struct vm_anon *uvm_analloc(void);
  102 void uvm_anfree(struct vm_anon *);
  103 void uvm_anon_init(void);
  104 int uvm_anon_add(int);
  105 void uvm_anon_remove(int);
  106 struct vm_page *uvm_anon_lockloanpg(struct vm_anon *);
  107 void uvm_anon_dropswap(struct vm_anon *);
  108 boolean_t anon_swap_off(int, int);
  109 void uvm_anon_release(struct vm_anon *);
  110 #endif /* _KERNEL */
  111 
  112 #endif /* _UVM_UVM_ANON_H_ */

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