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/
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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 <linux/libcfs/libcfs.h> instead
50 #include <linux/vmalloc.h>
51 #include <linux/pagemap.h>
52 #include <linux/slab.h>
53 #include <linux/memcontrol.h>
54 #include <linux/mm_inline.h>
56 #define CFS_PAGE_MASK (~((__u64)PAGE_CACHE_SIZE-1))
57 #define page_index(p) ((p)->index)
59 #define memory_pressure_get() (current->flags & PF_MEMALLOC)
60 #define memory_pressure_set() do { current->flags |= PF_MEMALLOC; } while (0)
61 #define memory_pressure_clr() do { current->flags &= ~PF_MEMALLOC; } while (0)
63 #if BITS_PER_LONG == 32
64 /* limit to lowmem on 32-bit systems */
65 #define NUM_CACHEPAGES \
66 min(totalram_pages, 1UL << (30 - PAGE_CACHE_SHIFT) * 3 / 4)
68 #define NUM_CACHEPAGES totalram_pages
72 * In Linux there is no way to determine whether current execution context is
75 #define ALLOC_ATOMIC_TRY GFP_ATOMIC
77 #define DECL_MMSPACE mm_segment_t __oldfs
78 #define MMSPACE_OPEN \
79 do { __oldfs = get_fs(); set_fs(get_ds());} while(0)
80 #define MMSPACE_CLOSE set_fs(__oldfs)
82 #endif /* __LINUX_CFS_MEM_H__ */