aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/linux-2.6/kmem.c
blob: 2d3f90afe5f14ee6ef3543d0bd6e01be014952ba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include "time.h"
#include "kmem.h"

#define MAX_VMALLOCS	6
#define MAX_SLAB_SIZE	0x20000

void *
kmem_alloc(size_t size, unsigned int __nocast flags)
{
	int	retries = 0;
	gfp_t	lflags = kmem_flags_convert(flags);
	void	*ptr;

#ifdef DEBUG
	if (unlikely(!(flags & KM_LARGE) && (size > PAGE_SIZE))) {
		printk(KERN_WARNING "Large %s attempt, size=%ld\n",
			__func__, (long)size);
		dump_stack();
	}
#endif

	do {
		if (size < MAX_SLAB_SIZE || retries > MAX_VMALLOCS)
			ptr = kmalloc(size, lflags);
		else
			ptr = __vmalloc(size, lflags, PAGE_KERNEL);
		if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
			return ptr;
		if (!(++retries % 100))
			printk(KERN_ERR "XFS: possible memory allocation "
					"deadlock in %s (mode:0x%x)\n",
					__func__, lflags);
		congestion_wait(BLK_RW_ASYNC, HZ/50);
	} while (1);
}

void *
kmem_zalloc(size_t size, unsigned int __nocast flags)
{
	void	*ptr;

	ptr = kmem_alloc(size, flags);
	if (ptr)
		memset((char *)ptr, 0, (int)size);
	return ptr;
}

void *
kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize,
		   unsigned int __nocast flags)
{
	void		*ptr;
	size_t		kmsize = maxsize;
	unsigned int	kmflags = (flags & ~KM_SLEEP) | KM_NOSLEEP;

	while (!(ptr = kmem_zalloc(kmsize, kmflags))) {
		if ((kmsize <= minsize) && (flags & KM_NOSLEEP))
			break;
		if ((kmsize >>= 1) <= minsize) {
			kmsize = minsize;
			kmflags = flags;
		}
	}
	if (ptr)
		*size = kmsize;
	return ptr;
}

void
kmem_free(const void *ptr)
{
	if (!is_vmalloc_addr(ptr)) {
		kfree(ptr);
	} else {
		vfree(ptr);
	}
}

void *
kmem_realloc(const void *ptr, size_t newsize, size_t oldsize,
	     unsigned int __nocast flags)
{
	void	*new;

	new = kmem_alloc(newsize, flags);
	if (ptr) {
		if (new)
			memcpy(new, ptr,
				((oldsize < newsize) ? oldsize : newsize));
		kmem_free(ptr);
	}
	return new;
}

void *
kmem_zone_alloc(kmem_zone_t *zone, unsigned int __nocast flags)
{
	int	retries = 0;
	gfp_t	lflags = kmem_flags_convert(flags);
	void	*ptr;

	do {
		ptr = kmem_cache_alloc(zone, lflags);
		if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
			return ptr;
		if (!(++retries % 100))
			printk(KERN_ERR "XFS: possible memory allocation "
					"deadlock in %s (mode:0x%x)\n",
					__func__, lflags);
		congestion_wait(BLK_RW_ASYNC, HZ/50);
	} while (1);
}

void *
kmem_zone_zalloc(kmem_zone_t *zone, unsigned int __nocast flags)
{
	void	*ptr;

	ptr = kmem_zone_alloc(zone, flags);
	if (ptr)
		memset((char *)ptr, 0, kmem_cache_size(zone));
	return ptr;
}