FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_pageout.h

     /*-
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * The Mach Operating System project at Carnegie-Mellon University.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)vm_pageout.h  8.2 (Berkeley) 1/12/94
     *
     *
     * Copyright (c) 1987, 1990 Carnegie-Mellon University.
     * All rights reserved.
     *
     * Author: Avadis Tevanian, Jr.
     *
     * Permission to use, copy, modify and distribute this software and
     * its documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     *
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * Carnegie Mellon requests users of this software to return to
     *
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     *
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     *
     * $FreeBSD: releng/11.2/sys/vm/vm_pageout.h 331722 2018-03-29 02:50:57Z eadler $
     */
    
    #ifndef _VM_VM_PAGEOUT_H_
    #define _VM_VM_PAGEOUT_H_
    
    #ifdef _KERNEL
    
    /*
     *      Header file for pageout daemon.
     */
    
    /*
     *      Exported data structures.
     */
    
    extern int vm_page_max_wired;
    extern int vm_pageout_deficit;
    extern int vm_pageout_page_count;
    extern bool vm_pageout_wanted;
    extern bool vm_pages_needed;
    
    #define VM_OOM_MEM      1
    #define VM_OOM_SWAPZ    2
    
    /*
     * vm_lowmem flags.
     */
    #define VM_LOW_KMEM     0x01
    #define VM_LOW_PAGES    0x02
    
    /*
     *      Exported routines.
     */
    
    /*
     *      Signal pageout-daemon and wait for it.
     */
    
    void pagedaemon_wait(int pri, const char *wmesg);
   void pagedaemon_wakeup(void);
   #define VM_WAIT vm_wait()
   #define VM_WAITPFAULT vm_waitpfault()
   void vm_wait(void);
   void vm_waitpfault(void);
   
   int vm_pageout_flush(vm_page_t *, int, int, int, int *, boolean_t *);
   void vm_pageout_oom(int shortage);
   
   void vm_swapout_run(void);
   void vm_swapout_run_idle(void);
   #endif /* _KERNEL */
   #endif  /* _VM_VM_PAGEOUT_H_ */

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