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/* $NetBSD: shrinker.h,v 1.5 2021/12/19 01:22:37 riastradh Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 _LINUX_SHRINKER_H_
#define _LINUX_SHRINKER_H_
#include <uvm/uvm.h>
struct shrink_control {
unsigned long nr_to_scan;
unsigned long nr_scanned;
};
struct shrinker {
int (*shrink)(struct shrinker *, struct shrink_control *);
unsigned long (*count_objects)(struct shrinker *,
struct shrink_control *);
unsigned long (*scan_objects)(struct shrinker *,
struct shrink_control *);
int seeks;
size_t batch;
};
#define SHRINK_STOP (~0UL)
#define DEFAULT_SEEKS 2 /* XXX cargo-culted from Linux */
static inline int
register_shrinker(struct shrinker *shrinker __unused)
{
return 0;
}
static inline void
unregister_shrinker(struct shrinker *shrinker __unused)
{
}
static inline bool
current_is_kswapd(void)
{
return curlwp == uvm.pagedaemon_lwp;
}
static inline size_t
get_nr_swap_pages(void)
{
return uvmexp.swpages;
}
#endif /* _LINUX_SHRINKER_H_ */
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