2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1987, 1993
5 * The Regents of the University of California.
6 * Copyright (c) 2005, 2009 Robert N. M. Watson
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33 * @(#)malloc.h 8.5 (Berkeley) 5/3/95
37 #ifndef _SYS_MALLOC_H_
38 #define _SYS_MALLOC_H_
40 #include <sys/param.h>
41 #include <sys/queue.h>
42 #include <sys/_lock.h>
43 #include <sys/_mutex.h>
44 #include <machine/_limits.h>
46 #define MINALLOCSIZE UMA_SMALLEST_UNIT
51 #define M_NOWAIT 0x0001 /* do not block */
52 #define M_WAITOK 0x0002 /* ok to block */
53 #define M_ZERO 0x0100 /* bzero the allocation */
54 #define M_NOVM 0x0200 /* don't ask VM for pages */
55 #define M_USE_RESERVE 0x0400 /* can alloc out of reserve memory */
56 #define M_NODUMP 0x0800 /* don't dump pages in this allocation */
57 #define M_FIRSTFIT 0x1000 /* Only for vmem, fast fit. */
58 #define M_BESTFIT 0x2000 /* Only for vmem, low fragmentation. */
60 #define M_MAGIC 877983977 /* time when first defined :-) */
63 * Two malloc type structures are present: malloc_type, which is used by a
64 * type owner to declare the type, and malloc_type_internal, which holds
65 * malloc-owned statistics and other ABI-sensitive fields, such as the set of
66 * malloc statistics indexed by the compile-time MAXCPU constant.
67 * Applications should avoid introducing dependence on the allocator private
68 * data layout and size.
70 * The malloc_type ks_next field is protected by malloc_mtx. Other fields in
71 * malloc_type are static after initialization so unsynchronized.
73 * Statistics in malloc_type_stats are written only when holding a critical
74 * section and running on the CPU associated with the index into the stat
75 * array, but read lock-free resulting in possible (minor) races, which the
76 * monitoring app should take into account.
78 struct malloc_type_stats {
79 uint64_t mts_memalloced; /* Bytes allocated on CPU. */
80 uint64_t mts_memfreed; /* Bytes freed on CPU. */
81 uint64_t mts_numallocs; /* Number of allocates on CPU. */
82 uint64_t mts_numfrees; /* number of frees on CPU. */
83 uint64_t mts_size; /* Bitmask of sizes allocated on CPU. */
84 uint64_t _mts_reserved1; /* Reserved field. */
85 uint64_t _mts_reserved2; /* Reserved field. */
86 uint64_t _mts_reserved3; /* Reserved field. */
90 * Index definitions for the mti_probes[] array.
92 #define DTMALLOC_PROBE_MALLOC 0
93 #define DTMALLOC_PROBE_FREE 1
94 #define DTMALLOC_PROBE_MAX 2
96 struct malloc_type_internal {
97 uint32_t mti_probes[DTMALLOC_PROBE_MAX];
98 /* DTrace probe ID array. */
100 struct malloc_type_stats mti_stats[MAXCPU];
104 * Public data structure describing a malloc type. Private data is hung off
105 * of ks_handle to avoid encoding internal malloc(9) data structures in
106 * modules, which will statically allocate struct malloc_type.
109 struct malloc_type *ks_next; /* Next in global chain. */
110 u_long ks_magic; /* Detect programmer error. */
111 const char *ks_shortdesc; /* Printable type name. */
112 void *ks_handle; /* Priv. data, was lo_class. */
116 * Statistics structure headers for user space. The kern.malloc sysctl
117 * exposes a structure stream consisting of a stream header, then a series of
118 * malloc type headers and statistics structures (quantity maxcpus). For
119 * convenience, the kernel will provide the current value of maxcpus at the
120 * head of the stream.
122 #define MALLOC_TYPE_STREAM_VERSION 0x00000001
123 struct malloc_type_stream_header {
124 uint32_t mtsh_version; /* Stream format version. */
125 uint32_t mtsh_maxcpus; /* Value of MAXCPU for stream. */
126 uint32_t mtsh_count; /* Number of records. */
127 uint32_t _mtsh_pad; /* Pad/reserved field. */
130 #define MALLOC_MAX_NAME 32
131 struct malloc_type_header {
132 char mth_name[MALLOC_MAX_NAME];
136 #define MALLOC_DEFINE(type, shortdesc, longdesc) \
137 struct malloc_type type[1] = { \
138 { NULL, M_MAGIC, shortdesc, NULL } \
140 SYSINIT(type##_init, SI_SUB_KMEM, SI_ORDER_THIRD, malloc_init, \
142 SYSUNINIT(type##_uninit, SI_SUB_KMEM, SI_ORDER_ANY, \
145 #define MALLOC_DECLARE(type) \
146 extern struct malloc_type type[1]
148 MALLOC_DECLARE(M_CACHE);
149 MALLOC_DECLARE(M_DEVBUF);
150 MALLOC_DECLARE(M_TEMP);
153 * Deprecated macro versions of not-quite-malloc() and free().
155 #define MALLOC(space, cast, size, type, flags) \
156 ((space) = (cast)malloc((u_long)(size), (type), (flags)))
157 #define FREE(addr, type) free((addr), (type))
160 * XXX this should be declared in <sys/uio.h>, but that tends to fail
161 * because <sys/uio.h> is included in a header before the source file
162 * has a chance to include <sys/malloc.h> to get MALLOC_DECLARE() defined.
164 MALLOC_DECLARE(M_IOV);
166 extern struct mtx malloc_mtx;
169 * Function type used when iterating over the list of malloc types.
171 typedef void malloc_type_list_func_t(struct malloc_type *, void *);
173 void contigfree(void *addr, unsigned long size, struct malloc_type *type);
174 void *contigmalloc(unsigned long size, struct malloc_type *type, int flags,
175 vm_paddr_t low, vm_paddr_t high, unsigned long alignment,
176 vm_paddr_t boundary) __malloc_like __result_use_check
177 __alloc_size(1) __alloc_align(6);
178 void free(void *addr, struct malloc_type *type);
179 void *malloc(unsigned long size, struct malloc_type *type, int flags)
180 __malloc_like __result_use_check __alloc_size(1);
181 void *mallocarray(size_t nmemb, size_t size, struct malloc_type *type,
182 int flags) __malloc_like __result_use_check
183 __alloc_size(1) __alloc_size(2);
184 void malloc_init(void *);
185 int malloc_last_fail(void);
186 void malloc_type_allocated(struct malloc_type *type, unsigned long size);
187 void malloc_type_freed(struct malloc_type *type, unsigned long size);
188 void malloc_type_list(malloc_type_list_func_t *, void *);
189 void malloc_uninit(void *);
190 void *realloc(void *addr, unsigned long size, struct malloc_type *type,
191 int flags) __result_use_check __alloc_size(2);
192 void *reallocf(void *addr, unsigned long size, struct malloc_type *type,
193 int flags) __result_use_check __alloc_size(2);
195 struct malloc_type *malloc_desc2type(const char *desc);
198 * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
199 * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
201 #define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 8 / 2))
203 WOULD_OVERFLOW(size_t nmemb, size_t size)
206 return ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
207 nmemb > 0 && __SIZE_T_MAX / nmemb < size);
209 #undef MUL_NO_OVERFLOW
212 #endif /* !_SYS_MALLOC_H_ */