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 #include <linux/gfp.h> 33 34 struct shrink_control { 35 gfp_t gfp_mask; 36 unsigned long nr_to_scan; 37 unsigned long nr_scanned; 38 }; 39 40 struct shrinker { 41 unsigned long (*count_objects)(struct shrinker *, struct shrink_control *); 42 unsigned long (*scan_objects)(struct shrinker *, struct shrink_control *); 43 int seeks; 44 long batch; 45 TAILQ_ENTRY(shrinker) next; 46 }; 47 48 #define SHRINK_STOP (~0UL) 49 50 #define DEFAULT_SEEKS 2 51 52 int linuxkpi_register_shrinker(struct shrinker *s); 53 void linuxkpi_unregister_shrinker(struct shrinker *s); 54 55 #define register_shrinker(s) linuxkpi_register_shrinker(s) 56 #define unregister_shrinker(s) linuxkpi_unregister_shrinker(s) 57 58 #endif /* _LINUXKPI_LINUX_SHRINKER_H_ */ 59