lib/libcaps/slaballoc.h

   1 /*
   2  * SLABALLOC.H  - Userland SLAB memory allocator
   3  *
   4  * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com>
   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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $DragonFly: src/lib/libcaps/slaballoc.h,v 1.3 2004/03/06 19:48:22 dillon Exp $
  29  */
  30
  31 #ifndef _LIBCAPS_SLABALLOC_H_
  32 #define _LIBCAPS_SLABALLOC_H_
  33
  34 #ifndef _SYS_STDINT_H_
  35 #include <sys/stdint.h>
  36 #endif
  37 #ifndef _SYS_MALLOC_H_
  38 #include <sys/malloc.h>
  39 #endif
  40
  41 /*
  42  * Note that any allocations which are exact multiples of PAGE_SIZE, or
  43  * which are >= ZALLOC_ZONE_LIMIT, will fall through to the kmem subsystem.
  44  */
  45 #define ZALLOC_ZONE_LIMIT       (16 * 1024)     /* max slab-managed alloc */
  46 #define ZALLOC_MIN_ZONE_SIZE    (32 * 1024)     /* minimum zone size */
  47 #define ZALLOC_MAX_ZONE_SIZE    (128 * 1024)    /* maximum zone size */
  48 #define ZALLOC_SLAB_MAGIC       0x736c6162      /* magic sanity */
  49 #define ZALLOC_OVSZ_MAGIC       0x736c6163      /* magic sanity */
  50 #define ZALLOC_SLAB_SLIDE       20
  51
  52
  53 #if ZALLOC_ZONE_LIMIT == 16384
  54 #define NZONES                  72
  55 #elif ZALLOC_ZONE_LIMIT == 32768
  56 #define NZONES                  80
  57 #else
  58 #error "I couldn't figure out NZONES"
  59 #endif
  60
  61 /*
  62  * Chunk structure for free elements
  63  */
  64 typedef struct SLChunk {
  65     struct SLChunk *c_Next;
  66 } SLChunk;
  67
  68 /*
  69  * The IN-BAND zone header is placed at the beginning of each zone.
  70  */
  71 typedef struct SLZone {
  72     __int32_t   z_Magic;        /* magic number for sanity check */
  73     int         z_Cpu;          /* which cpu owns this zone? */
  74     struct globaldata *z_CpuGd;
  75     int         z_NFree;        /* total free chunks / ualloc space in zone */
  76     struct SLZone *z_Next;      /* ZoneAry[] link if z_NFree non-zero */
  77     int         z_NMax;         /* maximum free chunks */
  78     char        *z_BasePtr;     /* pointer to start of chunk array */
  79     int         z_UIndex;       /* current initial allocation index */
  80     int         z_UEndIndex;    /* last (first) allocation index */
  81     int         z_ChunkSize;    /* chunk size for validation */
  82     int         z_FirstFreePg;  /* chunk list on a page-by-page basis */
  83     int         z_ZoneIndex;
  84     int         z_Flags;
  85     SLChunk     *z_PageAry[ZALLOC_MAX_ZONE_SIZE / PAGE_SIZE];
  86 } SLZone;
  87
  88 #define SLZF_UNOTZEROD          0x0001
  89
  90 typedef struct SLGlobalData {
  91     SLZone      *ZoneAry[NZONES];       /* linked list of zones NFree > 0 */
  92     SLZone      *FreeZones;             /* whole zones that have become free */
  93     SLZone      *FreeOvZones;           /* oversized zones */
  94     int         NFreeZones;             /* free zone count */
  95     int         JunkIndex;
  96     struct malloc_type ZoneInfo;        /* stats on meta-zones allocated */
  97 } SLGlobalData;
  98
  99 typedef struct SLOversized {
 100     struct SLOversized  *ov_Next;
 101     void                *ov_Ptr;
 102     __uintptr_t         ov_Bytes;
 103 } SLOversized;
 104
 105 void slab_init(void);
 106 void slab_malloc_init(void *data);
 107 void *slab_malloc(unsigned long size, struct malloc_type *type, int flags);
 108 void slab_free(void *ptr, struct malloc_type *info);
 109
 110 #endif
 111