FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/swap.h

     /*-
      * Copyright (c) 2018 Intel Corporation
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _LINUXKPI_LINUX_SWAP_H_
    #define _LINUXKPI_LINUX_SWAP_H_
    
    #include <sys/param.h>
    #include <sys/domainset.h>
    #include <sys/queue.h>
    #include <sys/proc.h>
    #include <sys/pcpu.h>
    
    #include <vm/vm.h>
    #include <vm/swap_pager.h>
    #include <vm/vm_pageout.h>
    
    static inline long
    get_nr_swap_pages(void)
    {
            int i, j;
    
            /* NB: This could be done cheaply by obtaining swap_total directly */
            swap_pager_status(&i, &j);
            return i - j;
    }
    
    static inline int
    current_is_kswapd(void)
    {
    
            return (curproc == pageproc);
    }
    
    #endif

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