sys/sys/objcache.h

   1 /*
   2  * Copyright (c) 2005 Jeffrey M. Hsu.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Jeffrey M. Hsu.
   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  * 3. Neither the name of The DragonFly Project nor the names of its
  16  *    contributors may be used to endorse or promote products derived
  17  *    from this software without specific, prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  22  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  23  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  25  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  27  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef _SYS_OBJCACHE_H_
  34 #define _SYS_OBJCACHE_H_
  35
  36 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  37
  38 #ifndef _SYS_TYPES_H_
  39 #include <sys/types.h>
  40 #endif
  41 #ifndef _SYS_MALLOC_H_
  42 #include <sys/malloc.h>
  43 #endif
  44
  45 #define OC_MFLAGS       0x0000ffff      /* same as malloc flags */
  46
  47 typedef __boolean_t (objcache_ctor_fn)(void *obj, void *privdata, int ocflags);
  48 typedef void (objcache_dtor_fn)(void *obj, void *privdata);
  49
  50 /*
  51  * Underlying allocator.
  52  */
  53 typedef void *(objcache_alloc_fn)(void *allocator_args, int ocflags);
  54 typedef void (objcache_free_fn)(void *obj, void *allocator_args);
  55
  56 #ifdef  _KERNEL
  57
  58 struct objcache;
  59
  60 struct objcache
  61         *objcache_create(const char *name, int cluster_limit, int nom_cache,
  62                          objcache_ctor_fn *ctor, objcache_dtor_fn *dtor,
  63                          void *privdata,
  64                          objcache_alloc_fn *alloc, objcache_free_fn *free,
  65                          void *allocator_args);
  66 struct objcache
  67         *objcache_create_simple(malloc_type_t mtype, size_t objsize);
  68 struct objcache
  69         *objcache_create_mbacked(malloc_type_t mtype, size_t objsize,
  70                           int cluster_limit, int nom_cache,
  71                           objcache_ctor_fn *ctor, objcache_dtor_fn *dtor,
  72                           void *privdata);
  73 void    objcache_set_cluster_limit(struct objcache *oc, int cluster_limit);
  74 void    *objcache_get(struct objcache *oc, int ocflags);
  75 void     objcache_put(struct objcache *oc, void *obj);
  76 void     objcache_dtor(struct objcache *oc, void *obj);
  77 void     objcache_populate_linear(struct objcache *oc, void *elts, int nelts,
  78                                   int size);
  79 __boolean_t objcache_reclaimlist(struct objcache *oc[], int nlist, int ocflags);
  80 void     objcache_destroy(struct objcache *oc);
  81
  82 #endif  /* !_KERNEL */
  83
  84 /*
  85  * Common underlying allocators.
  86  */
  87 struct objcache_malloc_args {
  88         size_t          objsize;
  89         malloc_type_t   mtype;
  90 };
  91
  92 #ifdef  _KERNEL
  93
  94 void    *objcache_malloc_alloc(void *allocator_args, int ocflags);
  95 void    *objcache_malloc_alloc_zero(void *allocator_args, int ocflags);
  96 void     objcache_malloc_free(void *obj, void *allocator_args);
  97
  98 void    *objcache_nop_alloc(void *allocator_args, int ocflags);
  99 void     objcache_nop_free(void *obj, void *allocator_args);
 100
 101 #endif  /* _KERNEL */
 102
 103 #endif  /* _KERNEL || _KERNEL_STRUCTURES */
 104
 105 #define OBJCACHE_UNLIMITED      0x40000000
 106 #define OBJCACHE_NAMELEN        32
 107
 108 struct objcache_stats {
 109         char            oc_name[OBJCACHE_NAMELEN];      /* \0 term. */
 110
 111         /*
 112          * >= OBJCACHE_UNLIMITED, if unlimited.
 113          */
 114         u_long          oc_limit;
 115
 116         u_long          oc_requested;
 117         u_long          oc_used;
 118         u_long          oc_cached;
 119         u_long          oc_exhausted;
 120         u_long          oc_failed;
 121         u_long          oc_allocated;
 122         u_long          oc_reserved[5];                 /* reserved 0. */
 123 };
 124
 125 #endif  /* !_SYS_OBJCACHE_H_ */