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/vm/vm_swapout_dummy.c

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    1 /*-
    2  * SPDX-License-Identifier: (BSD-4-Clause AND MIT-CMU)
    3  *
    4  * Copyright (c) 1991 Regents of the University of California.
    5  * All rights reserved.
    6  * Copyright (c) 1994 John S. Dyson
    7  * All rights reserved.
    8  * Copyright (c) 1994 David Greenman
    9  * All rights reserved.
   10  * Copyright (c) 2005 Yahoo! Technologies Norway AS
   11  * All rights reserved.
   12  *
   13  * This code is derived from software contributed to Berkeley by
   14  * The Mach Operating System project at Carnegie-Mellon University.
   15  *
   16  * Redistribution and use in source and binary forms, with or without
   17  * modification, are permitted provided that the following conditions
   18  * are met:
   19  * 1. Redistributions of source code must retain the above copyright
   20  *    notice, this list of conditions and the following disclaimer.
   21  * 2. Redistributions in binary form must reproduce the above copyright
   22  *    notice, this list of conditions and the following disclaimer in the
   23  *    documentation and/or other materials provided with the distribution.
   24  * 3. All advertising materials mentioning features or use of this software
   25  *    must display the following acknowledgement:
   26  *      This product includes software developed by the University of
   27  *      California, Berkeley and its contributors.
   28  * 4. Neither the name of the University nor the names of its contributors
   29  *    may be used to endorse or promote products derived from this software
   30  *    without specific prior written permission.
   31  *
   32  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   33  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   34  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   35  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   36  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   40  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   41  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   42  * SUCH DAMAGE.
   43  *
   44  *      from: @(#)vm_pageout.c  7.4 (Berkeley) 5/7/91
   45  *
   46  *
   47  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   48  * All rights reserved.
   49  *
   50  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
   51  *
   52  * Permission to use, copy, modify and distribute this software and
   53  * its documentation is hereby granted, provided that both the copyright
   54  * notice and this permission notice appear in all copies of the
   55  * software, derivative works or modified versions, and any portions
   56  * thereof, and that both notices appear in supporting documentation.
   57  *
   58  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   59  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   60  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   61  *
   62  * Carnegie Mellon requests users of this software to return to
   63  *
   64  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   65  *  School of Computer Science
   66  *  Carnegie Mellon University
   67  *  Pittsburgh PA 15213-3890
   68  *
   69  * any improvements or extensions that they make and grant Carnegie the
   70  * rights to redistribute these changes.
   71  */
   72 
   73 #include <sys/cdefs.h>
   74 __FBSDID("$FreeBSD: releng/12.0/sys/vm/vm_swapout_dummy.c 326403 2017-11-30 15:48:35Z pfg $");
   75 
   76 #include <sys/param.h>
   77 #include <sys/systm.h>
   78 #include <sys/kernel.h>
   79 #include <sys/lock.h>
   80 #include <sys/mutex.h>
   81 #include <sys/proc.h>
   82 #include <sys/sysctl.h>
   83 #include <sys/vmmeter.h>
   84 
   85 #include <vm/vm.h>
   86 #include <vm/vm_param.h>
   87 #include <vm/vm_pageout.h>
   88 
   89 static int vm_swap_enabled = 0;
   90 SYSCTL_INT(_vm, VM_SWAPPING_ENABLED, swap_enabled, CTLFLAG_RD,
   91     &vm_swap_enabled, 0,
   92     "Enable entire process swapout");
   93 
   94 static int vm_swap_idle_enabled = 0;
   95 SYSCTL_INT(_vm, OID_AUTO, swap_idle_enabled, CTLFLAG_RD,
   96     &vm_swap_idle_enabled, 0,
   97     "Allow swapout on idle criteria");
   98 
   99 void
  100 vm_swapout_run(void)
  101 {
  102 }
  103 
  104 void
  105 vm_swapout_run_idle(void)
  106 {
  107 }
  108 
  109 void
  110 faultin(struct proc *p)
  111 {
  112 
  113         PROC_LOCK_ASSERT(p, MA_OWNED);
  114         if ((p->p_flag & P_INMEM) == 0)
  115                 panic("faultin: proc %p swapped out with NO_SWAPPING", p);
  116 }
  117 
  118 void
  119 swapper(void)
  120 {
  121 
  122         for (;;)
  123                 tsleep(&proc0, PVM, "swapin", MAXSLP * hz);
  124 }

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