4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2014, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * libcfs/include/libcfs/linux/linux-mem.h
34 * Basic library routines.
37 #ifndef __LIBCFS_LINUX_CFS_MEM_H__
38 #define __LIBCFS_LINUX_CFS_MEM_H__
40 #ifndef __LIBCFS_LIBCFS_H__
41 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
45 #error This include is only for kernel use.
49 #include <linux/vmalloc.h>
50 #include <linux/pagemap.h>
51 #include <linux/slab.h>
53 # include <linux/mm_inline.h>
59 #ifdef HAVE_SHRINK_CONTROL
60 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
61 struct shrinker *shrinker, \
62 struct shrink_control *sc
63 # define shrink_param(sc, var) ((sc)->var)
65 struct shrink_control {
67 unsigned long nr_to_scan;
69 # ifdef HAVE_SHRINKER_WANT_SHRINK_PTR
70 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
71 struct shrinker *shrinker, \
72 int nr_to_scan, gfp_t gfp_mask
74 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
75 int nr_to_scan, gfp_t gfp_mask
77 /* avoid conflict with spl mm_compat.h */
78 # define HAVE_SHRINK_CONTROL_STRUCT 1
79 # define shrink_param(sc, var) (var)
82 #ifdef HAVE_SHRINKER_COUNT
84 unsigned long (*count)(struct shrinker *,
85 struct shrink_control *sc);
86 unsigned long (*scan)(struct shrinker *,
87 struct shrink_control *sc);
89 # define DEF_SHRINKER_VAR(name, shrink, count_obj, scan_obj) \
90 struct shrinker_var name = { .count = count_obj, .scan = scan_obj }
93 int (*shrink)(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask));
95 # define DEF_SHRINKER_VAR(name, shrinker, count, scan) \
96 struct shrinker_var name = { .shrink = shrinker }
97 # define SHRINK_STOP (~0UL)
101 struct shrinker *set_shrinker(int seek, struct shrinker_var *var)
105 s = kzalloc(sizeof(*s), GFP_KERNEL);
109 #ifdef HAVE_SHRINKER_COUNT
110 s->count_objects = var->count;
111 s->scan_objects = var->scan;
113 s->shrink = var->shrink;
117 register_shrinker(s);
123 void remove_shrinker(struct shrinker *shrinker)
125 if (shrinker == NULL)
128 unregister_shrinker(shrinker);
132 #endif /* __LINUX_CFS_MEM_H__ */