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
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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, 2012, 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 #define CFS_PAGE_MASK (~((__u64)PAGE_CACHE_SIZE-1))
62 #define page_index(p) ((p)->index)
65 #define memory_pressure_get() (current->flags & PF_MEMALLOC)
66 #define memory_pressure_set() do { current->flags |= PF_MEMALLOC; } while (0)
67 #define memory_pressure_clr() do { current->flags &= ~PF_MEMALLOC; } while (0)
69 #if BITS_PER_LONG == 32
70 /* limit to lowmem on 32-bit systems */
71 #define NUM_CACHEPAGES \
72 min(num_physpages, 1UL << (30 - PAGE_CACHE_SHIFT) * 3 / 4)
74 #define NUM_CACHEPAGES num_physpages
78 * In Linux there is no way to determine whether current execution context is
81 #define ALLOC_ATOMIC_TRY GFP_ATOMIC
82 /* GFP_IOFS was added in 2.6.33 kernel */
84 #define GFP_IOFS (__GFP_IO | __GFP_FS)
87 #define DECL_MMSPACE mm_segment_t __oldfs
88 #define MMSPACE_OPEN \
89 do { __oldfs = get_fs(); set_fs(get_ds());} while(0)
90 #define MMSPACE_CLOSE set_fs(__oldfs)
93 extern void *cfs_cpt_malloc(struct cfs_cpt_table *cptab, int cpt,
94 size_t nr_bytes, unsigned int flags);
95 extern void *cfs_cpt_vmalloc(struct cfs_cpt_table *cptab, int cpt,
97 extern struct page *cfs_page_cpt_alloc(struct cfs_cpt_table *cptab,
98 int cpt, unsigned int flags);
99 extern void *cfs_mem_cache_cpt_alloc(struct kmem_cache *cachep,
100 struct cfs_cpt_table *cptab,
101 int cpt, unsigned int flags);
107 #ifdef HAVE_SHRINK_CONTROL
108 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
109 struct shrinker *shrinker, \
110 struct shrink_control *sc
111 # define shrink_param(sc, var) ((sc)->var)
113 # ifdef HAVE_SHRINKER_WANT_SHRINK_PTR
114 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
115 struct shrinker *shrinker, \
116 int nr_to_scan, gfp_t gfp_mask
118 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \
119 int nr_to_scan, gfp_t gfp_mask
121 # define shrink_param(sc, var) (var)
124 typedef int (*shrinker_t)(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask));
127 struct shrinker *set_shrinker(int seek, shrinker_t func)
131 s = kmalloc(sizeof(*s), GFP_KERNEL);
138 register_shrinker(s);
144 void remove_shrinker(struct shrinker *shrinker)
146 if (shrinker == NULL)
149 unregister_shrinker(shrinker);
153 #endif /* __LINUX_CFS_MEM_H__ */