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 26 #ifndef _LINUXKPI_LINUX_SHRINKER_H_ 27 #define _LINUXKPI_LINUX_SHRINKER_H_ 28 29 #include <sys/queue.h> 30 #include <linux/gfp.h> 31 32 struct shrink_control { 33 gfp_t gfp_mask; 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 void linuxkpi_synchronize_shrinkers(void); 53 54 #if defined(LINUXKPI_VERSION) && LINUXKPI_VERSION >= 60000 55 #define register_shrinker(s, ...) linuxkpi_register_shrinker(s) 56 #else 57 #define register_shrinker(s) linuxkpi_register_shrinker(s) 58 #endif 59 #define unregister_shrinker(s) linuxkpi_unregister_shrinker(s) 60 #define synchronize_shrinkers() linuxkpi_synchronize_shrinkers() 61 62 #endif /* _LINUXKPI_LINUX_SHRINKER_H_ */ 63