1 /*- 2 * Copyright (c) 2018 Intel Corporation 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in 11 * the documentation and/or other materials provided with the 12 * distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUXKPI_LINUX_SWAP_H_ 28 #define _LINUXKPI_LINUX_SWAP_H_ 29 30 #include <sys/param.h> 31 #include <sys/domainset.h> 32 #include <sys/queue.h> 33 #include <sys/proc.h> 34 #include <sys/pcpu.h> 35 36 #include <vm/vm.h> 37 #include <vm/swap_pager.h> 38 #include <vm/vm_pageout.h> 39 40 static inline long 41 get_nr_swap_pages(void) 42 { 43 int i, j; 44 45 /* NB: This could be done cheaply by obtaining swap_total directly */ 46 swap_pager_status(&i, &j); 47 return i - j; 48 } 49 50 static inline int 51 current_is_kswapd(void) 52 { 53 54 return (curproc == pageproc); 55 } 56 57 #endif 58