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shrinker.h revision 1.3 
      1  1.3  riastrad /*	$NetBSD: shrinker.h,v 1.3 2014/07/16 20:56:25 riastradh Exp $	*/
      2  1.2  riastrad 
      3  1.2  riastrad /*-
      4  1.2  riastrad  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  1.2  riastrad  * All rights reserved.
      6  1.2  riastrad  *
      7  1.2  riastrad  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2  riastrad  * by Taylor R. Campbell.
      9  1.2  riastrad  *
     10  1.2  riastrad  * Redistribution and use in source and binary forms, with or without
     11  1.2  riastrad  * modification, are permitted provided that the following conditions
     12  1.2  riastrad  * are met:
     13  1.2  riastrad  * 1. Redistributions of source code must retain the above copyright
     14  1.2  riastrad  *    notice, this list of conditions and the following disclaimer.
     15  1.2  riastrad  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.2  riastrad  *    notice, this list of conditions and the following disclaimer in the
     17  1.2  riastrad  *    documentation and/or other materials provided with the distribution.
     18  1.2  riastrad  *
     19  1.2  riastrad  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.2  riastrad  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.2  riastrad  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.2  riastrad  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.2  riastrad  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.2  riastrad  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.2  riastrad  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.2  riastrad  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.2  riastrad  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.2  riastrad  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.2  riastrad  * POSSIBILITY OF SUCH DAMAGE.
     30  1.2  riastrad  */
     31  1.2  riastrad 
     32  1.2  riastrad #ifndef _LINUX_SHRINKER_H_
     33  1.2  riastrad #define _LINUX_SHRINKER_H_
     34  1.2  riastrad 
     35  1.2  riastrad struct shrink_control {
     36  1.3  riastrad 	unsigned long	nr_to_scan;
     37  1.2  riastrad };
     38  1.2  riastrad 
     39  1.2  riastrad struct shrinker {
     40  1.3  riastrad 	int		(*shrink)(struct shrinker *, struct shrink_control *);
     41  1.3  riastrad 	unsigned long	(*count_objects)(struct shrinker *,
     42  1.3  riastrad 			    struct shrink_control *);
     43  1.3  riastrad 	unsigned long	(*scan_objects)(struct shrinker *,
     44  1.3  riastrad 			    struct shrink_control *);
     45  1.3  riastrad 	int		seeks;
     46  1.2  riastrad };
     47  1.2  riastrad 
     48  1.2  riastrad #define	DEFAULT_SEEKS	2	/* XXX cargo-culted from Linux */
     49  1.2  riastrad 
     50  1.2  riastrad static inline void
     51  1.2  riastrad register_shrinker(struct shrinker *shrinker __unused)
     52  1.2  riastrad {
     53  1.2  riastrad }
     54  1.2  riastrad 
     55  1.2  riastrad static inline void
     56  1.2  riastrad unregister_shrinker(struct shrinker *shrinker __unused)
     57  1.2  riastrad {
     58  1.2  riastrad }
     59  1.2  riastrad 
     60  1.2  riastrad #endif  /* _LINUX_SHRINKER_H_ */
     61