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/*
* 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(totalram_pages, 1UL << (30 - PAGE_CACHE_SHIFT) * 3 / 4)
#else
#define NUM_CACHEPAGES totalram_pages
#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__ */
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