diff options
Diffstat (limited to 'drivers/staging/lustre/include/linux/libcfs/linux/linux-mem.h')
-rw-r--r-- | drivers/staging/lustre/include/linux/libcfs/linux/linux-mem.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/staging/lustre/include/linux/libcfs/linux/linux-mem.h b/drivers/staging/lustre/include/linux/libcfs/linux/linux-mem.h new file mode 100644 index 000000000000..042a2bc432be --- /dev/null +++ b/drivers/staging/lustre/include/linux/libcfs/linux/linux-mem.h @@ -0,0 +1,120 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2011, 2012, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * libcfs/include/libcfs/linux/linux-mem.h + * + * Basic library routines. + */ + +#ifndef __LIBCFS_LINUX_CFS_MEM_H__ +#define __LIBCFS_LINUX_CFS_MEM_H__ + +#ifndef __LIBCFS_LIBCFS_H__ +#error Do not #include this file directly. #include <linux/libcfs/libcfs.h> instead +#endif + + +#include <linux/mm.h> +#include <linux/vmalloc.h> +#include <linux/pagemap.h> +#include <linux/slab.h> +#include <linux/memcontrol.h> +#include <linux/mm_inline.h> + +#define CFS_PAGE_MASK (~((__u64)PAGE_CACHE_SIZE-1)) +#define page_index(p) ((p)->index) + +#define memory_pressure_get() (current->flags & PF_MEMALLOC) +#define memory_pressure_set() do { current->flags |= PF_MEMALLOC; } while (0) +#define memory_pressure_clr() do { current->flags &= ~PF_MEMALLOC; } while (0) + +#if BITS_PER_LONG == 32 +/* limit to lowmem on 32-bit systems */ +#define NUM_CACHEPAGES \ + min(num_physpages, 1UL << (30 - PAGE_CACHE_SHIFT) * 3 / 4) +#else +#define NUM_CACHEPAGES num_physpages +#endif + +/* + * In Linux there is no way to determine whether current execution context is + * blockable. + */ +#define ALLOC_ATOMIC_TRY GFP_ATOMIC + +#define DECL_MMSPACE mm_segment_t __oldfs +#define MMSPACE_OPEN \ + do { __oldfs = get_fs(); set_fs(get_ds());} while(0) +#define MMSPACE_CLOSE set_fs(__oldfs) + +/* + * Shrinker + */ + +# define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask) \ + struct shrinker *shrinker, \ + struct shrink_control *sc +# define shrink_param(sc, var) ((sc)->var) + +typedef int (*shrinker_t)(SHRINKER_ARGS(sc, nr_to_scan, gfp_mask)); + +static inline +struct shrinker *set_shrinker(int seek, shrinker_t func) +{ + struct shrinker *s; + + s = kmalloc(sizeof(*s), GFP_KERNEL); + if (s == NULL) + return (NULL); + + s->shrink = func; + s->seeks = seek; + + register_shrinker(s); + + return s; +} + +static inline +void remove_shrinker(struct shrinker *shrinker) +{ + if (shrinker == NULL) + return; + + unregister_shrinker(shrinker); + kfree(shrinker); +} + +#endif /* __LINUX_CFS_MEM_H__ */ |