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.sun.com/software/products/lustre/docs/GPLv2.pdf
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2014, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * libcfs/include/libcfs/linux/linux-mem.h
38 * Basic library routines.
41 #ifndef __LIBCFS_LINUX_CFS_MEM_H__
42 #define __LIBCFS_LINUX_CFS_MEM_H__
44 #ifndef __LIBCFS_LIBCFS_H__
45 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
49 #error This include is only for kernel use.
53 #include <linux/vmalloc.h>
54 #include <linux/pagemap.h>
55 #include <linux/slab.h>
57 # include <linux/mm_inline.h>
60 #ifndef HAVE_LIBCFS_CPT
61 /* Need this for cfs_cpt_table */
62 #include <libcfs/libcfs_cpu.h>
65 #define CFS_PAGE_MASK (~((__u64)PAGE_CACHE_SIZE-1))
67 #define page_index(p) ((p)->index)
70 #define memory_pressure_get() (current->flags & PF_MEMALLOC)
71 #define memory_pressure_set() do { current->flags |= PF_MEMALLOC; } while (0)
72 #define memory_pressure_clr() do { current->flags &= ~PF_MEMALLOC; } while (0)
74 #if BITS_PER_LONG == 32
75 /* limit to lowmem on 32-bit systems */
76 #define NUM_CACHEPAGES \
77 min(totalram_pages, 1UL << (30 - PAGE_CACHE_SHIFT) * 3 / 4)
79 #define NUM_CACHEPAGES totalram_pages
83 * In Linux there is no way to determine whether current execution context is
86 #define ALLOC_ATOMIC_TRY GFP_ATOMIC
87 /* GFP_IOFS was added in 2.6.33 kernel */
89 #define GFP_IOFS (__GFP_IO | __GFP_FS)
92 #define DECL_MMSPACE mm_segment_t __oldfs
93 #define MMSPACE_OPEN \
94 do { __oldfs = get_fs(); set_fs(get_ds());} while(0)
95 #define MMSPACE_CLOSE set_fs(__oldfs)
98 extern void *cfs_cpt_malloc(struct cfs_cpt_table *cptab, int cpt,
99 size_t nr_bytes, gfp_t flags);
100 extern void *cfs_cpt_vzalloc(struct cfs_cpt_table *cptab, int cpt,
102 extern struct page *cfs_page_cpt_alloc(struct cfs_cpt_table *cptab,
103 int cpt, gfp_t flags);
104 extern void *cfs_mem_cache_cpt_alloc(struct kmem_cache *cachep,
105 struct cfs_cpt_table *cptab,
106 int cpt, gfp_t flags);
111 #ifdef HAVE_SHRINK_CONTROL
112 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
113 struct shrinker *shrinker, \
114 struct shrink_control *sc
115 # define shrink_param(sc, var) ((sc)->var)
117 struct shrink_control {
119 unsigned long nr_to_scan;
121 # ifdef HAVE_SHRINKER_WANT_SHRINK_PTR
122 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
123 struct shrinker *shrinker, \
124 int nr_to_scan, gfp_t gfp_mask
126 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
127 int nr_to_scan, gfp_t gfp_mask
129 /* avoid conflict with spl mm_compat.h */
130 # define HAVE_SHRINK_CONTROL_STRUCT 1
131 # define shrink_param(sc, var) (var)
134 #ifdef HAVE_SHRINKER_COUNT
135 struct shrinker_var {
136 unsigned long (*count)(struct shrinker *,
137 struct shrink_control *sc);
138 unsigned long (*scan)(struct shrinker *,
139 struct shrink_control *sc);
141 # define DEF_SHRINKER_VAR(name, shrink, count_obj, scan_obj) \
142 struct shrinker_var name = { .count = count_obj, .scan = scan_obj }
144 struct shrinker_var {
145 int (*shrink)(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask));
147 # define DEF_SHRINKER_VAR(name, shrinker, count, scan) \
148 struct shrinker_var name = { .shrink = shrinker }
149 # define SHRINK_STOP (~0UL)
153 struct shrinker *set_shrinker(int seek, struct shrinker_var *var)
157 s = kzalloc(sizeof(*s), GFP_KERNEL);
161 #ifdef HAVE_SHRINKER_COUNT
162 s->count_objects = var->count;
163 s->scan_objects = var->scan;
165 s->shrink = var->shrink;
169 register_shrinker(s);
175 void remove_shrinker(struct shrinker *shrinker)
177 if (shrinker == NULL)
180 unregister_shrinker(shrinker);
184 #endif /* __LINUX_CFS_MEM_H__ */