/*- * Copyright (c) 2020 Emmanuel Vadot * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _LINUXKPI_LINUX_SHRINKER_H_ #define _LINUXKPI_LINUX_SHRINKER_H_ #include #include struct shrink_control { gfp_t gfp_mask; unsigned long nr_to_scan; unsigned long nr_scanned; }; struct shrinker { unsigned long (*count_objects)(struct shrinker *, struct shrink_control *); unsigned long (*scan_objects)(struct shrinker *, struct shrink_control *); int seeks; long batch; TAILQ_ENTRY(shrinker) next; }; #define SHRINK_STOP (~0UL) #define DEFAULT_SEEKS 2 int linuxkpi_register_shrinker(struct shrinker *s); void linuxkpi_unregister_shrinker(struct shrinker *s); void linuxkpi_synchronize_shrinkers(void); #if defined(LINUXKPI_VERSION) && LINUXKPI_VERSION >= 60000 #define register_shrinker(s, ...) linuxkpi_register_shrinker(s) #else #define register_shrinker(s) linuxkpi_register_shrinker(s) #endif #define unregister_shrinker(s) linuxkpi_unregister_shrinker(s) #define synchronize_shrinkers() linuxkpi_synchronize_shrinkers() #endif /* _LINUXKPI_LINUX_SHRINKER_H_ */