mtmalloc_impl.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1998-2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _MTMALLOC_IMPL_H
#define _MTMALLOC_IMPL_H
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Various data structures that define the guts of the mt malloc
* library.
*/
#include <sys/types.h>
#include <synch.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct cache {
mutex_t mt_cache_lock; /* lock for this data structure */
caddr_t mt_freelist; /* free block bit mask */
caddr_t mt_arena; /* addr of arena for actual dblks */
size_t mt_nfree; /* how many freeblocks do we have */
size_t mt_size; /* size of this cache */
size_t mt_span; /* how long is this cache */
struct cache *mt_next; /* next cache in list */
int mt_hunks; /* at creation time what chunk size */
} cache_t;
typedef struct oversize {
struct oversize *next_bysize;
struct oversize *prev_bysize;
struct oversize *next_byaddr;
struct oversize *prev_byaddr;
struct oversize *hash_next;
caddr_t addr;
size_t size;
} oversize_t;
typedef struct cache_head {
cache_t *mt_cache;
cache_t *mt_hint;
} cache_head_t;
/* used to avoid false sharing, should be power-of-2 >= cache coherency size */
#define CACHE_COHERENCY_UNIT 64
#define PERCPU_SIZE CACHE_COHERENCY_UNIT
#define PERCPU_PAD (PERCPU_SIZE - sizeof (mutex_t) - \
sizeof (cache_head_t *))
typedef struct percpu {
mutex_t mt_parent_lock; /* used for hooking in new caches */
cache_head_t *mt_caches;
char mt_pad[PERCPU_PAD];
} percpu_t;
typedef uint_t (*curcpu_func)(void);
#define DATA_SHIFT 1
#define TAIL_SHIFT 2
/*
* Oversize bit definitions: 3 bits to represent the oversize for
* head fragment, data itself, and tail fragment.
* If the head fragment is oversize, the first bit is on.
* If the data itself is oversize, the second bit is on.
* If the tail fragment is oversize, then the third bit is on.
*/
#define NONE_OVERSIZE 0x0
#define HEAD_OVERSIZE 0x1
#define DATA_OVERSIZE 0x2
#define HEAD_AND_DATA_OVERSIZE 0x3
#define TAIL_OVERSIZE 0x4
#define HEAD_AND_TAIL_OVERSIZE 0x5
#define DATA_AND_TAIL_OVERSIZE 0x6
#define ALL_OVERSIZE 0x7
#ifdef __cplusplus
}
#endif
#endif /* _MTMALLOC_IMPL_H */