Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include <linux/mm.h> |
5b3cc15a | 19 | #include <linux/sched/mm.h> |
1da177e4 | 20 | #include <linux/highmem.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 LT |
22 | #include <linux/swap.h> |
23 | #include <linux/blkdev.h> | |
3fcfab16 | 24 | #include <linux/backing-dev.h> |
1da177e4 | 25 | #include "kmem.h" |
4f10700a | 26 | #include "xfs_message.h" |
1da177e4 | 27 | |
bdfb0430 CH |
28 | /* |
29 | * Greedy allocation. May fail and may return vmalloced memory. | |
bdfb0430 CH |
30 | */ |
31 | void * | |
32 | kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize) | |
33 | { | |
34 | void *ptr; | |
35 | size_t kmsize = maxsize; | |
36 | ||
fdd3ccee | 37 | while (!(ptr = vzalloc(kmsize))) { |
bdfb0430 CH |
38 | if ((kmsize >>= 1) <= minsize) |
39 | kmsize = minsize; | |
40 | } | |
41 | if (ptr) | |
42 | *size = kmsize; | |
43 | return ptr; | |
44 | } | |
1da177e4 | 45 | |
1da177e4 | 46 | void * |
77ba7877 | 47 | kmem_alloc(size_t size, xfs_km_flags_t flags) |
1da177e4 | 48 | { |
27496a8c AV |
49 | int retries = 0; |
50 | gfp_t lflags = kmem_flags_convert(flags); | |
51 | void *ptr; | |
1da177e4 LT |
52 | |
53 | do { | |
bdfb0430 | 54 | ptr = kmalloc(size, lflags); |
1da177e4 LT |
55 | if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) |
56 | return ptr; | |
57 | if (!(++retries % 100)) | |
4f10700a | 58 | xfs_err(NULL, |
847f9f68 | 59 | "%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)", |
5bf97b1c | 60 | current->comm, current->pid, |
847f9f68 | 61 | (unsigned int)size, __func__, lflags); |
8aa7e847 | 62 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
1da177e4 LT |
63 | } while (1); |
64 | } | |
65 | ||
fdd3ccee DC |
66 | void * |
67 | kmem_zalloc_large(size_t size, xfs_km_flags_t flags) | |
68 | { | |
ae687e58 | 69 | unsigned noio_flag = 0; |
fdd3ccee | 70 | void *ptr; |
ae687e58 | 71 | gfp_t lflags; |
fdd3ccee DC |
72 | |
73 | ptr = kmem_zalloc(size, flags | KM_MAYFAIL); | |
74 | if (ptr) | |
75 | return ptr; | |
ae687e58 DC |
76 | |
77 | /* | |
78 | * __vmalloc() will allocate data pages and auxillary structures (e.g. | |
79 | * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context | |
80 | * here. Hence we need to tell memory reclaim that we are in such a | |
81 | * context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering | |
82 | * the filesystem here and potentially deadlocking. | |
83 | */ | |
84 | if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) | |
85 | noio_flag = memalloc_noio_save(); | |
86 | ||
87 | lflags = kmem_flags_convert(flags); | |
88 | ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); | |
89 | ||
90 | if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) | |
91 | memalloc_noio_restore(noio_flag); | |
92 | ||
93 | return ptr; | |
fdd3ccee DC |
94 | } |
95 | ||
1da177e4 | 96 | void * |
664b60f6 | 97 | kmem_realloc(const void *old, size_t newsize, xfs_km_flags_t flags) |
1da177e4 | 98 | { |
664b60f6 CH |
99 | int retries = 0; |
100 | gfp_t lflags = kmem_flags_convert(flags); | |
101 | void *ptr; | |
1da177e4 | 102 | |
664b60f6 CH |
103 | do { |
104 | ptr = krealloc(old, newsize, lflags); | |
105 | if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) | |
106 | return ptr; | |
107 | if (!(++retries % 100)) | |
108 | xfs_err(NULL, | |
109 | "%s(%u) possible memory allocation deadlock size %zu in %s (mode:0x%x)", | |
110 | current->comm, current->pid, | |
111 | newsize, __func__, lflags); | |
112 | congestion_wait(BLK_RW_ASYNC, HZ/50); | |
113 | } while (1); | |
1da177e4 LT |
114 | } |
115 | ||
116 | void * | |
77ba7877 | 117 | kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags) |
1da177e4 | 118 | { |
27496a8c AV |
119 | int retries = 0; |
120 | gfp_t lflags = kmem_flags_convert(flags); | |
121 | void *ptr; | |
1da177e4 LT |
122 | |
123 | do { | |
124 | ptr = kmem_cache_alloc(zone, lflags); | |
125 | if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) | |
126 | return ptr; | |
127 | if (!(++retries % 100)) | |
4f10700a | 128 | xfs_err(NULL, |
5bf97b1c TH |
129 | "%s(%u) possible memory allocation deadlock in %s (mode:0x%x)", |
130 | current->comm, current->pid, | |
131 | __func__, lflags); | |
8aa7e847 | 132 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
1da177e4 LT |
133 | } while (1); |
134 | } |