1 /* 2 * Copyright (c) 2015-2016 François Tigeot 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_SWAP_H_ 28 #define _LINUX_SWAP_H_ 29 30 #include <vm/vm_page2.h> 31 32 #include <linux/list.h> 33 #include <asm/page.h> 34 35 static inline void mark_page_accessed(struct vm_page *m) 36 { 37 vm_page_flag_set(m, PG_REFERENCED); 38 } 39 40 /* from vm/swap_pager.h */ 41 #include <sys/conf.h> 42 extern int nswdev; 43 extern struct swdevt *swdevt; 44 45 static inline long 46 get_nr_swap_pages(void) 47 { 48 int n; 49 struct swdevt *sp; 50 long total_pages = 0; 51 long used_pages = 0; 52 53 for (n = 0; n < nswdev; n++) { 54 sp = &swdevt[n]; 55 56 total_pages += sp->sw_nblks; 57 used_pages += sp->sw_nused; 58 } 59 60 return (total_pages - used_pages); 61 } 62 63 #endif /* _LINUX_SWAP_H_ */ 64