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shrinker.h revision 1.3 
      1 /*	$NetBSD: shrinker.h,v 1.3 2014/07/16 20:56:25 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_SHRINKER_H_
     33 #define _LINUX_SHRINKER_H_
     34 
     35 struct shrink_control {
     36 	unsigned long	nr_to_scan;
     37 };
     38 
     39 struct shrinker {
     40 	int		(*shrink)(struct shrinker *, struct shrink_control *);
     41 	unsigned long	(*count_objects)(struct shrinker *,
     42 			    struct shrink_control *);
     43 	unsigned long	(*scan_objects)(struct shrinker *,
     44 			    struct shrink_control *);
     45 	int		seeks;
     46 };
     47 
     48 #define	DEFAULT_SEEKS	2	/* XXX cargo-culted from Linux */
     49 
     50 static inline void
     51 register_shrinker(struct shrinker *shrinker __unused)
     52 {
     53 }
     54 
     55 static inline void
     56 unregister_shrinker(struct shrinker *shrinker __unused)
     57 {
     58 }
     59 
     60 #endif  /* _LINUX_SHRINKER_H_ */
     61