malloc.h

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    1 /*
    2  * Copyright (c) 1987, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)malloc.h    8.5 (Berkeley) 5/3/95
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _SYS_MALLOC_H_
   38 #define _SYS_MALLOC_H_
   39 
   40 #define splmem splhigh
   41 
   42 /*
   43  * flags to malloc.
   44  */
   45 #define M_WAITOK        0x0000
   46 #define M_NOWAIT        0x0001          /* do not block */
   47 #define M_USE_RESERVE   0x0002          /* can alloc out of reserve memory */
   48 #define M_ASLEEP        0x0004          /* async sleep on failure */
   49 #define M_ZERO          0x0008          /* bzero the allocation */
   50 
   51 #define M_MAGIC         877983977       /* time when first defined :-) */
   52 
   53 struct malloc_type {
   54         struct malloc_type *ks_next;    /* next in list */
   55         long    ks_memuse;      /* total memory held in bytes */
   56         long    ks_limit;       /* most that are allowed to exist */
   57         long    ks_size;        /* sizes of this thing that are allocated */
   58         long    ks_inuse;       /* # of packets of this type currently in use */
   59         int64_t ks_calls;       /* total packets of this type ever allocated */
   60         long    ks_maxused;     /* maximum number ever used */
   61         u_long  ks_magic;       /* if it's not magic, don't touch it */
   62         const char *ks_shortdesc;       /* short description */
   63         u_short ks_limblocks;   /* number of times blocked for hitting limit */
   64         u_short ks_mapblocks;   /* number of times blocked for kernel map */
   65 };
   66 
   67 #ifdef _KERNEL
   68 #define MALLOC_DEFINE(type, shortdesc, longdesc) \
   69         struct malloc_type type[1] = { \
   70                 { NULL, 0, 0, 0, 0, 0, 0, M_MAGIC, shortdesc, 0, 0 } \
   71         }; \
   72         SYSINIT(type##_init, SI_SUB_KMEM, SI_ORDER_ANY, malloc_init, type); \
   73         SYSUNINIT(type##_uninit, SI_SUB_KMEM, SI_ORDER_ANY, malloc_uninit, type)
   74 
   75 #define MALLOC_DECLARE(type) \
   76         extern struct malloc_type type[1]
   77 
   78 MALLOC_DECLARE(M_CACHE);
   79 MALLOC_DECLARE(M_DEVBUF);
   80 MALLOC_DECLARE(M_TEMP);
   81 
   82 MALLOC_DECLARE(M_IP6OPT); /* for INET6 */
   83 MALLOC_DECLARE(M_IP6NDP); /* for INET6 */
   84 #endif /* _KERNEL */
   85 
   86 /*
   87  * Array of descriptors that describe the contents of each page
   88  */
   89 struct kmemusage {
   90         short ku_indx;          /* bucket index */
   91         union {
   92                 u_short freecnt;/* for small allocations, free pieces in page */
   93                 u_short pagecnt;/* for large allocations, pages alloced */
   94         } ku_un;
   95 };
   96 #define ku_freecnt ku_un.freecnt
   97 #define ku_pagecnt ku_un.pagecnt
   98 
   99 /*
  100  * Set of buckets for each size of memory block that is retained
  101  */
  102 struct kmembuckets {
  103         caddr_t kb_next;        /* list of free blocks */
  104         caddr_t kb_last;        /* last free block */
  105         int64_t kb_calls;       /* total calls to allocate this size */
  106         long    kb_total;       /* total number of blocks allocated */
  107         long    kb_elmpercl;    /* # of elements in this sized allocation */
  108         long    kb_totalfree;   /* # of free elements in this bucket */
  109         long    kb_highwat;     /* high water mark */
  110         long    kb_couldfree;   /* over high water mark and could free */
  111 };
  112 
  113 #ifdef _KERNEL
  114 #define MINALLOCSIZE    (1 << MINBUCKET)
  115 #define BUCKETINDX(size) \
  116         ((size) <= (MINALLOCSIZE * 128) \
  117                 ? (size) <= (MINALLOCSIZE * 8) \
  118                         ? (size) <= (MINALLOCSIZE * 2) \
  119                                 ? (size) <= (MINALLOCSIZE * 1) \
  120                                         ? (MINBUCKET + 0) \
  121                                         : (MINBUCKET + 1) \
  122                                 : (size) <= (MINALLOCSIZE * 4) \
  123                                         ? (MINBUCKET + 2) \
  124                                         : (MINBUCKET + 3) \
  125                         : (size) <= (MINALLOCSIZE* 32) \
  126                                 ? (size) <= (MINALLOCSIZE * 16) \
  127                                         ? (MINBUCKET + 4) \
  128                                         : (MINBUCKET + 5) \
  129                                 : (size) <= (MINALLOCSIZE * 64) \
  130                                         ? (MINBUCKET + 6) \
  131                                         : (MINBUCKET + 7) \
  132                 : (size) <= (MINALLOCSIZE * 2048) \
  133                         ? (size) <= (MINALLOCSIZE * 512) \
  134                                 ? (size) <= (MINALLOCSIZE * 256) \
  135                                         ? (MINBUCKET + 8) \
  136                                         : (MINBUCKET + 9) \
  137                                 : (size) <= (MINALLOCSIZE * 1024) \
  138                                         ? (MINBUCKET + 10) \
  139                                         : (MINBUCKET + 11) \
  140                         : (size) <= (MINALLOCSIZE * 8192) \
  141                                 ? (size) <= (MINALLOCSIZE * 4096) \
  142                                         ? (MINBUCKET + 12) \
  143                                         : (MINBUCKET + 13) \
  144                                 : (size) <= (MINALLOCSIZE * 16384) \
  145                                         ? (MINBUCKET + 14) \
  146                                         : (MINBUCKET + 15))
  147 
  148 /*
  149  * Turn virtual addresses into kmem map indices
  150  */
  151 #define kmemxtob(alloc) (kmembase + (alloc) * PAGE_SIZE)
  152 #define btokmemx(addr)  (((caddr_t)(addr) - kmembase) / PAGE_SIZE)
  153 #define btokup(addr)    (&kmemusage[((caddr_t)(addr) - kmembase) >> PAGE_SHIFT])
  154 
  155 /*
  156  * Deprecated macro versions of not-quite-malloc() and free().
  157  */
  158 #define MALLOC(space, cast, size, type, flags) \
  159         (space) = (cast)malloc((u_long)(size), (type), (flags))
  160 #define FREE(addr, type) free((addr), (type))
  161 
  162 /*
  163  * XXX this should be declared in <sys/uio.h>, but that tends to fail
  164  * because <sys/uio.h> is included in a header before the source file
  165  * has a chance to include <sys/malloc.h> to get MALLOC_DECLARE() defined.
  166  */
  167 MALLOC_DECLARE(M_IOV);
  168 
  169 /* XXX struct malloc_type is unused for contig*(). */
  170 void    contigfree __P((void *addr, unsigned long size,
  171                         struct malloc_type *type));
  172 void    *contigmalloc __P((unsigned long size, struct malloc_type *type,
  173                            int flags, vm_paddr_t low, vm_paddr_t high,
  174                            unsigned long alignment, unsigned long boundary));
  175 void    free __P((void *addr, struct malloc_type *type));
  176 void    *malloc __P((unsigned long size, struct malloc_type *type, int flags));
  177 void    malloc_init __P((void *));
  178 void    malloc_uninit __P((void *));
  179 void    *realloc __P((void *addr, unsigned long size,
  180                       struct malloc_type *type, int flags));
  181 void    *reallocf __P((void *addr, unsigned long size,
  182                       struct malloc_type *type, int flags));
  183 #endif /* _KERNEL */
  184 
  185 #endif /* !_SYS_MALLOC_H_ */

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

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sys/sys/malloc.h