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.h

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    1 /*      $NetBSD: uvm.h,v 1.44 2006/09/15 15:51:12 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  * from: Id: uvm.h,v 1.1.2.14 1998/02/02 20:07:19 chuck Exp
   35  */
   36 
   37 #ifndef _UVM_UVM_H_
   38 #define _UVM_UVM_H_
   39 
   40 #if defined(_KERNEL_OPT)
   41 #include "opt_lockdebug.h"
   42 #include "opt_multiprocessor.h"
   43 #include "opt_uvmhist.h"
   44 #endif
   45 
   46 #include <uvm/uvm_extern.h>
   47 
   48 #include <uvm/uvm_stat.h>
   49 
   50 /*
   51  * pull in prototypes
   52  */
   53 
   54 #include <uvm/uvm_amap.h>
   55 #include <uvm/uvm_aobj.h>
   56 #include <uvm/uvm_fault.h>
   57 #include <uvm/uvm_glue.h>
   58 #include <uvm/uvm_km.h>
   59 #include <uvm/uvm_loan.h>
   60 #include <uvm/uvm_map.h>
   61 #include <uvm/uvm_object.h>
   62 #include <uvm/uvm_page.h>
   63 #include <uvm/uvm_pager.h>
   64 #include <uvm/uvm_pdaemon.h>
   65 #include <uvm/uvm_swap.h>
   66 
   67 #ifdef _KERNEL
   68 
   69 /*
   70  * pull in VM_NFREELIST
   71  */
   72 #include <machine/vmparam.h>
   73 
   74 /*
   75  * uvm structure (vm global state: collected in one structure for ease
   76  * of reference...)
   77  */
   78 
   79 struct uvm {
   80         /* vm_page related parameters */
   81 
   82                 /* vm_page queues */
   83         struct pgfreelist page_free[VM_NFREELIST]; /* unallocated pages */
   84         int page_free_nextcolor;        /* next color to allocate from */
   85         struct simplelock pageqlock;    /* lock for active/inactive page q */
   86         struct simplelock fpageqlock;   /* lock for free page q */
   87         boolean_t page_init_done;       /* TRUE if uvm_page_init() finished */
   88         boolean_t page_idle_zero;       /* TRUE if we should try to zero
   89                                            pages in the idle loop */
   90 
   91                 /* page daemon trigger */
   92         int pagedaemon;                 /* daemon sleeps on this */
   93         struct proc *pagedaemon_proc;   /* daemon's pid */
   94         struct simplelock pagedaemon_lock;
   95 
   96                 /* aiodone daemon trigger */
   97         int aiodoned;                   /* daemon sleeps on this */
   98         struct proc *aiodoned_proc;     /* daemon's pid */
   99         struct simplelock aiodoned_lock;
  100 
  101                 /* page hash */
  102         struct pglist *page_hash;       /* page hash table (vp/off->page) */
  103         int page_nhash;                 /* number of buckets */
  104         int page_hashmask;              /* hash mask */
  105         struct simplelock hashlock;     /* lock on page_hash array */
  106 
  107         struct simplelock kentry_lock;
  108 
  109         /* aio_done is locked by uvm.pagedaemon_lock and splbio! */
  110         TAILQ_HEAD(, buf) aio_done;             /* done async i/o reqs */
  111 
  112         /* swap-related items */
  113         struct simplelock swap_data_lock;
  114 
  115         /* kernel object: to support anonymous pageable kernel memory */
  116         struct uvm_object *kernel_object;
  117 };
  118 
  119 #endif /* _KERNEL */
  120 
  121 /*
  122  * vm_map_entry etype bits:
  123  */
  124 
  125 #define UVM_ET_OBJ              0x01    /* it is a uvm_object */
  126 #define UVM_ET_SUBMAP           0x02    /* it is a vm_map submap */
  127 #define UVM_ET_COPYONWRITE      0x04    /* copy_on_write */
  128 #define UVM_ET_NEEDSCOPY        0x08    /* needs_copy */
  129 
  130 #define UVM_ET_ISOBJ(E)         (((E)->etype & UVM_ET_OBJ) != 0)
  131 #define UVM_ET_ISSUBMAP(E)      (((E)->etype & UVM_ET_SUBMAP) != 0)
  132 #define UVM_ET_ISCOPYONWRITE(E) (((E)->etype & UVM_ET_COPYONWRITE) != 0)
  133 #define UVM_ET_ISNEEDSCOPY(E)   (((E)->etype & UVM_ET_NEEDSCOPY) != 0)
  134 
  135 #ifdef _KERNEL
  136 
  137 /*
  138  * holds all the internal UVM data
  139  */
  140 extern struct uvm uvm;
  141 
  142 /*
  143  * historys
  144  */
  145 
  146 #ifdef UVMHIST
  147 UVMHIST_DECL(maphist);
  148 UVMHIST_DECL(pdhist);
  149 UVMHIST_DECL(ubchist);
  150 UVMHIST_DECL(loanhist);
  151 #endif
  152 
  153 extern struct evcnt uvm_ra_total;
  154 extern struct evcnt uvm_ra_hit;
  155 extern struct evcnt uvm_ra_miss;
  156 
  157 /*
  158  * UVM_UNLOCK_AND_WAIT: atomic unlock+wait... wrapper around the
  159  * interlocked tsleep() function.
  160  */
  161 
  162 #define UVM_UNLOCK_AND_WAIT(event, slock, intr, msg, timo)              \
  163 do {                                                                    \
  164         (void) ltsleep(event, PVM | PNORELOCK | (intr ? PCATCH : 0),    \
  165             msg, timo, slock);                                          \
  166 } while (/*CONSTCOND*/ 0)
  167 
  168 void uvm_kick_pdaemon(void);
  169 
  170 /*
  171  * UVM_PAGE_OWN: track page ownership (only if UVM_PAGE_TRKOWN)
  172  */
  173 
  174 #if defined(UVM_PAGE_TRKOWN)
  175 #define UVM_PAGE_OWN(PG, TAG) uvm_page_own(PG, TAG)
  176 #else
  177 #define UVM_PAGE_OWN(PG, TAG) /* nothing */
  178 #endif /* UVM_PAGE_TRKOWN */
  179 
  180 #include <uvm/uvm_fault_i.h>
  181 
  182 #endif /* _KERNEL */
  183 
  184 #endif /* _UVM_UVM_H_ */

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