tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include <linux/sched.h>
19#include <linux/mm.h>
20#include <linux/vmalloc.h>
21#include <linux/highmem.h>
22#include <linux/swap.h>
23#include <linux/blkdev.h>
24#include "time.h"
25#include "kmem.h"
26
27#define MAX_VMALLOCS 6
28#define MAX_SLAB_SIZE 0x20000
29
30void *
31kmem_alloc(size_t size, unsigned int __nocast flags)
32{
33 int retries = 0;
34 gfp_t lflags = kmem_flags_convert(flags);
35 void *ptr;
36
37 do {
38 if (size < MAX_SLAB_SIZE || retries > MAX_VMALLOCS)
39 ptr = kmalloc(size, lflags);
40 else
41 ptr = __vmalloc(size, lflags, PAGE_KERNEL);
42 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
43 return ptr;
44 if (!(++retries % 100))
45 printk(KERN_ERR "XFS: possible memory allocation "
46 "deadlock in %s (mode:0x%x)\n",
47 __FUNCTION__, lflags);
48 blk_congestion_wait(WRITE, HZ/50);
49 } while (1);
50}
51
52void *
53kmem_zalloc(size_t size, unsigned int __nocast flags)
54{
55 void *ptr;
56
57 ptr = kmem_alloc(size, flags);
58 if (ptr)
59 memset((char *)ptr, 0, (int)size);
60 return ptr;
61}
62
63void
64kmem_free(void *ptr, size_t size)
65{
66 if (((unsigned long)ptr < VMALLOC_START) ||
67 ((unsigned long)ptr >= VMALLOC_END)) {
68 kfree(ptr);
69 } else {
70 vfree(ptr);
71 }
72}
73
74void *
75kmem_realloc(void *ptr, size_t newsize, size_t oldsize,
76 unsigned int __nocast flags)
77{
78 void *new;
79
80 new = kmem_alloc(newsize, flags);
81 if (ptr) {
82 if (new)
83 memcpy(new, ptr,
84 ((oldsize < newsize) ? oldsize : newsize));
85 kmem_free(ptr, oldsize);
86 }
87 return new;
88}
89
90void *
91kmem_zone_alloc(kmem_zone_t *zone, unsigned int __nocast flags)
92{
93 int retries = 0;
94 gfp_t lflags = kmem_flags_convert(flags);
95 void *ptr;
96
97 do {
98 ptr = kmem_cache_alloc(zone, lflags);
99 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
100 return ptr;
101 if (!(++retries % 100))
102 printk(KERN_ERR "XFS: possible memory allocation "
103 "deadlock in %s (mode:0x%x)\n",
104 __FUNCTION__, lflags);
105 blk_congestion_wait(WRITE, HZ/50);
106 } while (1);
107}
108
109void *
110kmem_zone_zalloc(kmem_zone_t *zone, unsigned int __nocast flags)
111{
112 void *ptr;
113
114 ptr = kmem_zone_alloc(zone, flags);
115 if (ptr)
116 memset((char *)ptr, 0, kmem_cache_size(zone));
117 return ptr;
118}