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 1.25 2008/01/02 11:49:15 ad 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 #if defined(_KERNEL_OPT)
   43 #include "opt_vmswap.h"
   44 #endif
   45 
   46 /*
   47  * anonymous memory management
   48  *
   49  * anonymous virtual memory is short term virtual memory that goes away
   50  * when the processes referencing it go away.    an anonymous page of
   51  * virtual memory is described by the following data structure:
   52  */
   53 
   54 struct vm_anon {
   55         int an_ref;                     /* reference count [an_lock] */
   56         kmutex_t an_lock;               /* lock for an_ref */
   57         struct vm_page *an_page;/* if in RAM [an_lock] */
   58 #if defined(VMSWAP) || 1 /* XXX libkvm */
   59         int an_swslot;          /* drum swap slot # (if != 0)
   60                                    [an_lock.  also, it is ok to read
   61                                    an_swslot if we hold an_page PG_BUSY] */
   62 #endif /* defined(VMSWAP) */
   63 };
   64 
   65 /*
   66  * for active vm_anon's the data can be in one of the following state:
   67  * [1] in a vm_page with no backing store allocated yet, [2] in a vm_page
   68  * with backing store allocated, or [3] paged out to backing store
   69  * (no vm_page).
   70  *
   71  * for pageout in case [2]: if the page has been modified then we must
   72  * flush it out to backing store, otherwise we can just dump the
   73  * vm_page.
   74  */
   75 
   76 /*
   77  * anons are grouped together in anonymous memory maps, or amaps.
   78  * amaps are defined in uvm_amap.h.
   79  */
   80 
   81 /*
   82  * processes reference anonymous virtual memory maps with an anonymous
   83  * reference structure:
   84  */
   85 
   86 struct vm_aref {
   87         int ar_pageoff;                 /* page offset into amap we start */
   88         struct vm_amap *ar_amap;        /* pointer to amap */
   89 };
   90 
   91 /*
   92  * the offset field indicates which part of the amap we are referencing.
   93  * locked by vm_map lock.
   94  */
   95 
   96 #ifdef _KERNEL
   97 
   98 /*
   99  * prototypes
  100  */
  101 
  102 struct vm_anon *uvm_analloc(void);
  103 void uvm_anfree(struct vm_anon *);
  104 void uvm_anon_init(void);
  105 struct vm_page *uvm_anon_lockloanpg(struct vm_anon *);
  106 #if defined(VMSWAP)
  107 void uvm_anon_dropswap(struct vm_anon *);
  108 #else /* defined(VMSWAP) */
  109 #define uvm_anon_dropswap(a)    /* nothing */
  110 #endif /* defined(VMSWAP) */
  111 void uvm_anon_release(struct vm_anon *);
  112 bool uvm_anon_pagein(struct vm_anon *);
  113 #endif /* _KERNEL */
  114 
  115 #endif /* _UVM_UVM_ANON_H_ */

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