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A driver can register a shrinker that will be called when the kernel wants to free some memory. Add support for that in linuxkpi and call the registered shrinkers when the lowmem event is triggered. Reviewed by: bz Differential Revision: https://reviews.freebsd.org/D27728
56 lines
2 KiB
C
56 lines
2 KiB
C
/*-
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* Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __LINUX_SHRINKER_H__
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#define __LINUX_SHRINKER_H__
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#include <sys/queue.h>
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struct shrink_control {
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unsigned long nr_to_scan;
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unsigned long nr_scanned;
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};
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struct shrinker {
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unsigned long (*count_objects)(struct shrinker *, struct shrink_control *);
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unsigned long (*scan_objects)(struct shrinker *, struct shrink_control *);
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int seeks;
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long batch;
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TAILQ_ENTRY(shrinker) next;
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};
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#define SHRINK_STOP (~0UL)
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#define DEFAULT_SEEKS 2
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int linuxkpi_register_shrinker(struct shrinker *s);
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void linuxkpi_unregister_shrinker(struct shrinker *s);
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#define register_shrinker(s) linuxkpi_register_shrinker(s)
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#define unregister_shrinker(s) linuxkpi_unregister_shrinker(s)
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#endif /* __LINUX_SHRINKER_H__ */
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