2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/types.h>
45 * Efficiently allocate memory that will only be freed in bulk
48 mzalloc(struct memzone *zone, int bytes)
50 struct memchunk *chunk;
53 if ((chunk = zone->curr) != NULL) {
54 if (bytes > chunk->bytes - zone->index) {
55 chunk->next = zone->list;
62 chunk = malloc(sizeof(*chunk));
65 bzero(chunk, sizeof(*chunk));
66 chunk->base = mmap(NULL, MEMZONE_CHUNK, PROT_READ|PROT_WRITE,
67 MAP_ANON|MAP_PRIVATE, -1, 0);
68 if (chunk->base == MAP_FAILED) {
72 chunk->bytes = MEMZONE_CHUNK;
76 if (bytes > chunk->bytes)
77 pfatal("allocation to large for mzalloc!");
78 ptr = chunk->base + zone->index;
79 zone->index += (bytes + 7) & ~7;
87 mzpurge(struct memzone *zone)
89 struct memchunk *chunk;
91 if ((chunk = zone->curr) != NULL) {
92 chunk->next = zone->list;
96 while ((chunk = zone->list) != NULL) {
97 zone->list = chunk->next;
98 munmap(chunk->base, chunk->bytes);