The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/malloc.h

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    1 /*-
    2  * Copyright (c) 1987, 1993
    3  *      The Regents of the University of California.
    4  * Copyright (c) 2005 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/6.2/sys/sys/malloc.h 164286 2006-11-14 20:42:41Z cvs2svn $
   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 struct malloc_type_internal {
   84         struct malloc_type_stats        mti_stats[MAXCPU];
   85 };
   86 
   87 /*
   88  * ABI-compatible version of the old 'struct malloc_type', only all stats are
   89  * now malloc-managed in malloc-owned memory rather than in caller memory, so
   90  * as to avoid ABI issues.  The ks_next pointer is reused as a pointer to the
   91  * internal data handle.
   92  */
   93 struct malloc_type {
   94         struct malloc_type *ks_next;    /* Next in global chain. */
   95         u_long           _ks_memuse;    /* No longer used. */
   96         u_long           _ks_size;      /* No longer used. */
   97         u_long           _ks_inuse;     /* No longer used. */
   98         uint64_t         _ks_calls;     /* No longer used. */
   99         u_long           _ks_maxused;   /* No longer used. */
  100         u_long           ks_magic;      /* Detect programmer error. */
  101         const char      *ks_shortdesc;  /* Printable type name. */
  102 
  103         /*
  104          * struct malloc_type was terminated with a struct mtx, which is no
  105          * longer required.  For ABI reasons, continue to flesh out the full
  106          * size of the old structure, but reuse the _lo_class field for our
  107          * internal data handle.
  108          */
  109         void            *ks_handle;     /* Priv. data, was lo_class. */
  110         const char      *_lo_name;
  111         const char      *_lo_type;
  112         u_int            _lo_flags;
  113         void            *_lo_list_next;
  114         struct witness  *_lo_witness;
  115         uintptr_t        _mtx_lock;
  116         u_int            _mtx_recurse;
  117 };
  118 
  119 /*
  120  * Statistics structure headers for user space.  The kern.malloc sysctl
  121  * exposes a structure stream consisting of a stream header, then a series of
  122  * malloc type headers and statistics structures (quantity maxcpus).  For
  123  * convenience, the kernel will provide the current value of maxcpus at the
  124  * head of the stream.
  125  */
  126 #define MALLOC_TYPE_STREAM_VERSION      0x00000001
  127 struct malloc_type_stream_header {
  128         uint32_t        mtsh_version;   /* Stream format version. */
  129         uint32_t        mtsh_maxcpus;   /* Value of MAXCPU for stream. */
  130         uint32_t        mtsh_count;     /* Number of records. */
  131         uint32_t        _mtsh_pad;      /* Pad/reserved field. */
  132 };
  133 
  134 #define MALLOC_MAX_NAME 32
  135 struct malloc_type_header {
  136         char                            mth_name[MALLOC_MAX_NAME];
  137 };
  138 
  139 #ifdef _KERNEL
  140 #define MALLOC_DEFINE(type, shortdesc, longdesc)                        \
  141         struct malloc_type type[1] = {                                  \
  142                 { NULL, 0, 0, 0, 0, 0, M_MAGIC, shortdesc, NULL, NULL,  \
  143                     NULL, 0, NULL, NULL, 0, 0 }                         \
  144         };                                                              \
  145         SYSINIT(type##_init, SI_SUB_KMEM, SI_ORDER_SECOND, malloc_init, \
  146             type);                                                      \
  147         SYSUNINIT(type##_uninit, SI_SUB_KMEM, SI_ORDER_ANY,             \
  148             malloc_uninit, type);
  149 
  150 #define MALLOC_DECLARE(type) \
  151         extern struct malloc_type type[1]
  152 
  153 MALLOC_DECLARE(M_CACHE);
  154 MALLOC_DECLARE(M_DEVBUF);
  155 MALLOC_DECLARE(M_TEMP);
  156 
  157 MALLOC_DECLARE(M_IP6OPT); /* for INET6 */
  158 MALLOC_DECLARE(M_IP6NDP); /* for INET6 */
  159 
  160 /*
  161  * Deprecated macro versions of not-quite-malloc() and free().
  162  */
  163 #define MALLOC(space, cast, size, type, flags) \
  164         ((space) = (cast)malloc((u_long)(size), (type), (flags)))
  165 #define FREE(addr, type) free((addr), (type))
  166 
  167 /*
  168  * XXX this should be declared in <sys/uio.h>, but that tends to fail
  169  * because <sys/uio.h> is included in a header before the source file
  170  * has a chance to include <sys/malloc.h> to get MALLOC_DECLARE() defined.
  171  */
  172 MALLOC_DECLARE(M_IOV);
  173 
  174 extern struct mtx malloc_mtx;
  175 
  176 /* XXX struct malloc_type is unused for contig*(). */
  177 void    contigfree(void *addr, unsigned long size, struct malloc_type *type);
  178 void    *contigmalloc(unsigned long size, struct malloc_type *type, int flags,
  179             vm_paddr_t low, vm_paddr_t high, unsigned long alignment,
  180             unsigned long boundary);
  181 void    free(void *addr, struct malloc_type *type);
  182 void    *malloc(unsigned long size, struct malloc_type *type, int flags);
  183 void    malloc_init(void *);
  184 int     malloc_last_fail(void);
  185 void    malloc_type_allocated(struct malloc_type *type, unsigned long size);
  186 void    malloc_type_freed(struct malloc_type *type, unsigned long size);
  187 void    malloc_uninit(void *);
  188 void    *realloc(void *addr, unsigned long size, struct malloc_type *type,
  189             int flags);
  190 void    *reallocf(void *addr, unsigned long size, struct malloc_type *type,
  191             int flags);
  192 #endif /* _KERNEL */
  193 
  194 #endif /* !_SYS_MALLOC_H_ */

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