1 /*- 2 * Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are 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 the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 #ifndef _LINUXKPI_LINUX_SHRINKER_H_ 29 #define _LINUXKPI_LINUX_SHRINKER_H_ 30 31 #include <sys/queue.h> 32 33 struct shrink_control { 34 unsigned long nr_to_scan; 35 unsigned long nr_scanned; 36 }; 37 38 struct shrinker { 39 unsigned long (*count_objects)(struct shrinker *, struct shrink_control *); 40 unsigned long (*scan_objects)(struct shrinker *, struct shrink_control *); 41 int seeks; 42 long batch; 43 TAILQ_ENTRY(shrinker) next; 44 }; 45 46 #define SHRINK_STOP (~0UL) 47 48 #define DEFAULT_SEEKS 2 49 50 int linuxkpi_register_shrinker(struct shrinker *s); 51 void linuxkpi_unregister_shrinker(struct shrinker *s); 52 53 #define register_shrinker(s) linuxkpi_register_shrinker(s) 54 #define unregister_shrinker(s) linuxkpi_unregister_shrinker(s) 55 56 #endif /* _LINUXKPI_LINUX_SHRINKER_H_ */ 57