FreeBSD/Linux Kernel Cross Reference
sys/sys/malloc.h
1 /*-
2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2005, 2009 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)malloc.h 8.5 (Berkeley) 5/3/95
32 * $FreeBSD: releng/8.4/sys/sys/malloc.h 199583 2009-11-20 15:27:52Z jhb $
33 */
34
35 #ifndef _SYS_MALLOC_H_
36 #define _SYS_MALLOC_H_
37
38 #include <sys/param.h>
39 #include <sys/queue.h>
40 #include <sys/_lock.h>
41 #include <sys/_mutex.h>
42
43 #define MINALLOCSIZE UMA_SMALLEST_UNIT
44
45 /*
46 * flags to malloc.
47 */
48 #define M_NOWAIT 0x0001 /* do not block */
49 #define M_WAITOK 0x0002 /* ok to block */
50 #define M_ZERO 0x0100 /* bzero the allocation */
51 #define M_NOVM 0x0200 /* don't ask VM for pages */
52 #define M_USE_RESERVE 0x0400 /* can alloc out of reserve memory */
53
54 #define M_MAGIC 877983977 /* time when first defined :-) */
55
56 /*
57 * Two malloc type structures are present: malloc_type, which is used by a
58 * type owner to declare the type, and malloc_type_internal, which holds
59 * malloc-owned statistics and other ABI-sensitive fields, such as the set of
60 * malloc statistics indexed by the compile-time MAXCPU constant.
61 * Applications should avoid introducing dependence on the allocator private
62 * data layout and size.
63 *
64 * The malloc_type ks_next field is protected by malloc_mtx. Other fields in
65 * malloc_type are static after initialization so unsynchronized.
66 *
67 * Statistics in malloc_type_stats are written only when holding a critical
68 * section and running on the CPU associated with the index into the stat
69 * array, but read lock-free resulting in possible (minor) races, which the
70 * monitoring app should take into account.
71 */
72 struct malloc_type_stats {
73 uint64_t mts_memalloced; /* Bytes allocated on CPU. */
74 uint64_t mts_memfreed; /* Bytes freed on CPU. */
75 uint64_t mts_numallocs; /* Number of allocates on CPU. */
76 uint64_t mts_numfrees; /* number of frees on CPU. */
77 uint64_t mts_size; /* Bitmask of sizes allocated on CPU. */
78 uint64_t _mts_reserved1; /* Reserved field. */
79 uint64_t _mts_reserved2; /* Reserved field. */
80 uint64_t _mts_reserved3; /* Reserved field. */
81 };
82
83 /*
84 * Index definitions for the mti_probes[] array.
85 */
86 #define DTMALLOC_PROBE_MALLOC 0
87 #define DTMALLOC_PROBE_FREE 1
88 #define DTMALLOC_PROBE_MAX 2
89
90 struct malloc_type_internal {
91 uint32_t mti_probes[DTMALLOC_PROBE_MAX];
92 /* DTrace probe ID array. */
93 struct malloc_type_stats mti_stats[MAXCPU];
94 };
95
96 /*
97 * Public data structure describing a malloc type. Private data is hung off
98 * of ks_handle to avoid encoding internal malloc(9) data structures in
99 * modules, which will statically allocate struct malloc_type.
100 */
101 struct malloc_type {
102 struct malloc_type *ks_next; /* Next in global chain. */
103 u_long ks_magic; /* Detect programmer error. */
104 const char *ks_shortdesc; /* Printable type name. */
105 void *ks_handle; /* Priv. data, was lo_class. */
106 };
107
108 /*
109 * Statistics structure headers for user space. The kern.malloc sysctl
110 * exposes a structure stream consisting of a stream header, then a series of
111 * malloc type headers and statistics structures (quantity maxcpus). For
112 * convenience, the kernel will provide the current value of maxcpus at the
113 * head of the stream.
114 */
115 #define MALLOC_TYPE_STREAM_VERSION 0x00000001
116 struct malloc_type_stream_header {
117 uint32_t mtsh_version; /* Stream format version. */
118 uint32_t mtsh_maxcpus; /* Value of MAXCPU for stream. */
119 uint32_t mtsh_count; /* Number of records. */
120 uint32_t _mtsh_pad; /* Pad/reserved field. */
121 };
122
123 #define MALLOC_MAX_NAME 32
124 struct malloc_type_header {
125 char mth_name[MALLOC_MAX_NAME];
126 };
127
128 #ifdef _KERNEL
129 #define MALLOC_DEFINE(type, shortdesc, longdesc) \
130 struct malloc_type type[1] = { \
131 { NULL, M_MAGIC, shortdesc, NULL } \
132 }; \
133 SYSINIT(type##_init, SI_SUB_KMEM, SI_ORDER_SECOND, malloc_init, \
134 type); \
135 SYSUNINIT(type##_uninit, SI_SUB_KMEM, SI_ORDER_ANY, \
136 malloc_uninit, type)
137
138 #define MALLOC_DECLARE(type) \
139 extern struct malloc_type type[1]
140
141 MALLOC_DECLARE(M_CACHE);
142 MALLOC_DECLARE(M_DEVBUF);
143 MALLOC_DECLARE(M_TEMP);
144
145 MALLOC_DECLARE(M_IP6OPT); /* for INET6 */
146 MALLOC_DECLARE(M_IP6NDP); /* for INET6 */
147
148 /*
149 * Deprecated macro versions of not-quite-malloc() and free().
150 */
151 #define MALLOC(space, cast, size, type, flags) \
152 ((space) = (cast)malloc((u_long)(size), (type), (flags)))
153 #define FREE(addr, type) free((addr), (type))
154
155 /*
156 * XXX this should be declared in <sys/uio.h>, but that tends to fail
157 * because <sys/uio.h> is included in a header before the source file
158 * has a chance to include <sys/malloc.h> to get MALLOC_DECLARE() defined.
159 */
160 MALLOC_DECLARE(M_IOV);
161
162 extern struct mtx malloc_mtx;
163
164 /*
165 * Function type used when iterating over the list of malloc types.
166 */
167 typedef void malloc_type_list_func_t(struct malloc_type *, void *);
168
169 void contigfree(void *addr, unsigned long size, struct malloc_type *type);
170 void *contigmalloc(unsigned long size, struct malloc_type *type, int flags,
171 vm_paddr_t low, vm_paddr_t high, unsigned long alignment,
172 unsigned long boundary) __malloc_like;
173 void free(void *addr, struct malloc_type *type);
174 void *malloc(unsigned long size, struct malloc_type *type, int flags) __malloc_like;
175 void malloc_init(void *);
176 int malloc_last_fail(void);
177 void malloc_type_allocated(struct malloc_type *type, unsigned long size);
178 void malloc_type_freed(struct malloc_type *type, unsigned long size);
179 void malloc_type_list(malloc_type_list_func_t *, void *);
180 void malloc_uninit(void *);
181 void *realloc(void *addr, unsigned long size, struct malloc_type *type,
182 int flags);
183 void *reallocf(void *addr, unsigned long size, struct malloc_type *type,
184 int flags);
185
186 struct malloc_type *malloc_desc2type(const char *desc);
187 #endif /* _KERNEL */
188
189 #endif /* !_SYS_MALLOC_H_ */
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