2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1987, 1993
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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>
45 #define MINALLOCSIZE UMA_SMALLEST_UNIT
50 #define M_NOWAIT 0x0001 /* do not block */
51 #define M_WAITOK 0x0002 /* ok to block */
52 #define M_ZERO 0x0100 /* bzero the allocation */
53 #define M_NOVM 0x0200 /* don't ask VM for pages */
54 #define M_USE_RESERVE 0x0400 /* can alloc out of reserve memory */
55 #define M_NODUMP 0x0800 /* don't dump pages in this allocation */
56 #define M_FIRSTFIT 0x1000 /* Only for vmem, fast fit. */
57 #define M_BESTFIT 0x2000 /* Only for vmem, low fragmentation. */
59 #define M_MAGIC 877983977 /* time when first defined :-) */
62 * Two malloc type structures are present: malloc_type, which is used by a
63 * type owner to declare the type, and malloc_type_internal, which holds
64 * malloc-owned statistics and other ABI-sensitive fields, such as the set of
65 * malloc statistics indexed by the compile-time MAXCPU constant.
66 * Applications should avoid introducing dependence on the allocator private
67 * data layout and size.
69 * The malloc_type ks_next field is protected by malloc_mtx. Other fields in
70 * malloc_type are static after initialization so unsynchronized.
72 * Statistics in malloc_type_stats are written only when holding a critical
73 * section and running on the CPU associated with the index into the stat
74 * array, but read lock-free resulting in possible (minor) races, which the
75 * monitoring app should take into account.
77 struct malloc_type_stats {
78 uint64_t mts_memalloced; /* Bytes allocated on CPU. */
79 uint64_t mts_memfreed; /* Bytes freed on CPU. */
80 uint64_t mts_numallocs; /* Number of allocates on CPU. */
81 uint64_t mts_numfrees; /* number of frees on CPU. */
82 uint64_t mts_size; /* Bitmask of sizes allocated on CPU. */
83 uint64_t _mts_reserved1; /* Reserved field. */
84 uint64_t _mts_reserved2; /* Reserved field. */
85 uint64_t _mts_reserved3; /* Reserved field. */
89 * Index definitions for the mti_probes[] array.
91 #define DTMALLOC_PROBE_MALLOC 0
92 #define DTMALLOC_PROBE_FREE 1
93 #define DTMALLOC_PROBE_MAX 2
95 struct malloc_type_internal {
96 uint32_t mti_probes[DTMALLOC_PROBE_MAX];
97 /* DTrace probe ID array. */
99 struct malloc_type_stats mti_stats[MAXCPU];
103 * Public data structure describing a malloc type. Private data is hung off
104 * of ks_handle to avoid encoding internal malloc(9) data structures in
105 * modules, which will statically allocate struct malloc_type.
108 struct malloc_type *ks_next; /* Next in global chain. */
109 u_long ks_magic; /* Detect programmer error. */
110 const char *ks_shortdesc; /* Printable type name. */
111 void *ks_handle; /* Priv. data, was lo_class. */
115 * Statistics structure headers for user space. The kern.malloc sysctl
116 * exposes a structure stream consisting of a stream header, then a series of
117 * malloc type headers and statistics structures (quantity maxcpus). For
118 * convenience, the kernel will provide the current value of maxcpus at the
119 * head of the stream.
121 #define MALLOC_TYPE_STREAM_VERSION 0x00000001
122 struct malloc_type_stream_header {
123 uint32_t mtsh_version; /* Stream format version. */
124 uint32_t mtsh_maxcpus; /* Value of MAXCPU for stream. */
125 uint32_t mtsh_count; /* Number of records. */
126 uint32_t _mtsh_pad; /* Pad/reserved field. */
129 #define MALLOC_MAX_NAME 32
130 struct malloc_type_header {
131 char mth_name[MALLOC_MAX_NAME];
135 #define MALLOC_DEFINE(type, shortdesc, longdesc) \
136 struct malloc_type type[1] = { \
137 { NULL, M_MAGIC, shortdesc, NULL } \
139 SYSINIT(type##_init, SI_SUB_KMEM, SI_ORDER_THIRD, malloc_init, \
141 SYSUNINIT(type##_uninit, SI_SUB_KMEM, SI_ORDER_ANY, \
144 #define MALLOC_DECLARE(type) \
145 extern struct malloc_type type[1]
147 MALLOC_DECLARE(M_CACHE);
148 MALLOC_DECLARE(M_DEVBUF);
149 MALLOC_DECLARE(M_TEMP);
152 * Deprecated macro versions of not-quite-malloc() and free().
154 #define MALLOC(space, cast, size, type, flags) \
155 ((space) = (cast)malloc((u_long)(size), (type), (flags)))
156 #define FREE(addr, type) free((addr), (type))
159 * XXX this should be declared in <sys/uio.h>, but that tends to fail
160 * because <sys/uio.h> is included in a header before the source file
161 * has a chance to include <sys/malloc.h> to get MALLOC_DECLARE() defined.
163 MALLOC_DECLARE(M_IOV);
165 extern struct mtx malloc_mtx;
168 * Function type used when iterating over the list of malloc types.
170 typedef void malloc_type_list_func_t(struct malloc_type *, void *);
172 void contigfree(void *addr, unsigned long size, struct malloc_type *type);
173 void *contigmalloc(unsigned long size, struct malloc_type *type, int flags,
174 vm_paddr_t low, vm_paddr_t high, unsigned long alignment,
175 vm_paddr_t boundary) __malloc_like __result_use_check
176 __alloc_size(1) __alloc_align(6);
177 void free(void *addr, struct malloc_type *type);
178 void *malloc(unsigned long size, struct malloc_type *type, int flags)
179 __malloc_like __result_use_check __alloc_size(1);
180 void malloc_init(void *);
181 int malloc_last_fail(void);
182 void malloc_type_allocated(struct malloc_type *type, unsigned long size);
183 void malloc_type_freed(struct malloc_type *type, unsigned long size);
184 void malloc_type_list(malloc_type_list_func_t *, void *);
185 void malloc_uninit(void *);
186 void *realloc(void *addr, unsigned long size, struct malloc_type *type,
187 int flags) __result_use_check __alloc_size(2);
188 void *reallocf(void *addr, unsigned long size, struct malloc_type *type,
189 int flags) __alloc_size(2);
191 struct malloc_type *malloc_desc2type(const char *desc);
194 #endif /* !_SYS_MALLOC_H_ */