sys/uvm/uvm_pdaemon.h

   1 /*      $NetBSD: uvm_pdaemon.h,v 1.17 2011/02/02 15:25:27 chuck Exp $   */
   2
   3 /*
   4  * Copyright (c) 1997 Charles D. Cranor and Washington University.
   5  * Copyright (c) 1991, 1993, The Regents of the University of California.
   6  *
   7  * All rights reserved.
   8  *
   9  * This code is derived from software contributed to Berkeley by
  10  * The Mach Operating System project at Carnegie-Mellon University.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)vm_pageout.h        8.2 (Berkeley) 1/12/94
  37  * from: Id: uvm_pdaemon.h,v 1.1.2.4 1998/02/02 20:07:20 chuck Exp
  38  *
  39  *
  40  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
  41  * All rights reserved.
  42  *
  43  * Permission to use, copy, modify and distribute this software and
  44  * its documentation is hereby granted, provided that both the copyright
  45  * notice and this permission notice appear in all copies of the
  46  * software, derivative works or modified versions, and any portions
  47  * thereof, and that both notices appear in supporting documentation.
  48  *
  49  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  50  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
  51  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  52  *
  53  * Carnegie Mellon requests users of this software to return to
  54  *
  55  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  56  *  School of Computer Science
  57  *  Carnegie Mellon University
  58  *  Pittsburgh PA 15213-3890
  59  *
  60  * any improvements or extensions that they make and grant Carnegie the
  61  * rights to redistribute these changes.
  62  */
  63
  64 #ifndef _UVM_UVM_PDAEMON_H_
  65 #define _UVM_UVM_PDAEMON_H_
  66
  67 /*
  68  * uvm_pdaemon.h: page daemon hooks
  69  */
  70
  71 #ifdef _KERNEL
  72
  73 /*
  74  * prototypes
  75  */
  76
  77 void uvm_wait(const char *);
  78 bool uvm_reclaimable(void);
  79
  80 kmutex_t *uvmpd_trylockowner(struct vm_page *);
  81 #ifdef VMSWAP
  82 bool uvmpd_trydropswap(struct vm_page *);
  83 #else
  84 #define uvmpd_trydropswap(_a_) (/*CONSTCOND*/false)
  85 #endif
  86
  87 #endif /* _KERNEL */
  88
  89 #endif /* _UVM_UVM_PDAEMON_H_ */