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FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_pglist.h

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    1 /*      $NetBSD: uvm_pglist.h,v 1.5 2001/08/25 20:37:46 chs Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 2000, 2001 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Jason R. Thorpe.
    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. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the NetBSD
   21  *      Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 #ifndef _UVM_UVM_PGLIST_H_
   40 #define _UVM_UVM_PGLIST_H_
   41 
   42 /*
   43  * This defines the type of a page queue, e.g. active list, inactive
   44  * list, etc.
   45  */
   46 TAILQ_HEAD(pglist, vm_page);
   47 
   48 /*
   49  * A page free list consists of free pages of unknown contents and free
   50  * pages of all zeros.
   51  */
   52 #define PGFL_UNKNOWN    0
   53 #define PGFL_ZEROS      1
   54 #define PGFL_NQUEUES    2
   55 
   56 struct pgflbucket {
   57         struct pglist pgfl_queues[PGFL_NQUEUES];
   58 };
   59 
   60 struct pgfreelist {
   61         struct pgflbucket *pgfl_buckets;
   62 };
   63 
   64 #endif /* _UVM_UVM_PGLIST_H_ */

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