1 /* 2 * KERN_SLABALLOC.H - Kernel 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/sys/sys/slaballoc.h,v 1.4 2003/10/02 22:27:00 dillon Exp $ 29 */ 30 31 #ifndef _SYS_SLABALLOC_H_ 32 #define _SYS_SLABALLOC_H_ 33 34 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 35 36 #ifndef _SYS_MALLOC_H_ 37 #include <sys/malloc.h> 38 #endif 39 40 /* 41 * Note that any allocations which are exact multiples of PAGE_SIZE, or 42 * which are >= ZALLOC_ZONE_LIMIT, will fall through to the kmem subsystem. 43 */ 44 #define ZALLOC_ZONE_LIMIT (16 * 1024) /* max slab-managed alloc */ 45 #define ZALLOC_MIN_ZONE_SIZE (32 * 1024) /* minimum zone size */ 46 #define ZALLOC_MAX_ZONE_SIZE (128 * 1024) /* maximum zone size */ 47 #define ZALLOC_SLAB_MAGIC 0x736c6162 /* magic sanity */ 48 #define ZALLOC_OVSZ_MAGIC 0x736c6163 /* magic sanity */ 49 #define ZALLOC_SLAB_SLIDE 20 50 51 52 #if ZALLOC_ZONE_LIMIT == 16384 53 #define NZONES 72 54 #elif ZALLOC_ZONE_LIMIT == 32768 55 #define NZONES 80 56 #else 57 #error "I couldn't figure out NZONES" 58 #endif 59 60 /* 61 * Chunk structure for free elements 62 */ 63 typedef struct SLChunk { 64 struct SLChunk *c_Next; 65 } SLChunk; 66 67 /* 68 * The IN-BAND zone header is placed at the beginning of each zone. 69 */ 70 typedef struct SLZone { 71 int32_t z_Magic; /* magic number for sanity check */ 72 int z_Cpu; /* which cpu owns this zone? */ 73 int z_NFree; /* total free chunks / ualloc space in zone */ 74 struct SLZone *z_Next; /* ZoneAry[] link if z_NFree non-zero */ 75 int z_NMax; /* maximum free chunks */ 76 char *z_BasePtr; /* pointer to start of chunk array */ 77 int z_UIndex; /* current initial allocation index */ 78 int z_UEndIndex; /* last (first) allocation index */ 79 int z_ChunkSize; /* chunk size for validation */ 80 int z_FirstFreePg; /* chunk list on a page-by-page basis */ 81 int z_ZoneIndex; 82 int z_Flags; 83 SLChunk *z_PageAry[ZALLOC_MAX_ZONE_SIZE / PAGE_SIZE]; 84 } SLZone; 85 86 #define SLZF_UNOTZEROD 0x0001 87 88 typedef struct SLGlobalData { 89 SLZone *ZoneAry[NZONES]; /* linked list of zones NFree > 0 */ 90 SLZone *FreeZones; /* whole zones that have become free */ 91 SLZone *FreeOvZones; /* oversized zones */ 92 int NFreeZones; /* free zone count */ 93 int JunkIndex; 94 struct malloc_type ZoneInfo; /* stats on meta-zones allocated */ 95 } SLGlobalData; 96 97 #endif 98 99 #ifdef _KERNEL 100 101 void slab_init(void); 102 void *slab_alloc(struct malloc_type *info, uintptr_t bytes, int flags); 103 void slab_free(void *ptr, struct malloc_type *info); 104 105 #endif /* _KERNEL */ 106 107 #endif 108 109