mirror of
https://gitlab.isc.org/isc-projects/bind9
synced 2025-08-27 20:49:04 +00:00
8550c52588
This commit extends the internal memory management middleware code in BIND so that memory contexts backed by dedicated jemalloc arenas can be created. A new function (isc_mem_create_arena()) is added for that. Moreover, it extends the existing code so that specialised memory contexts can be created easily, should we need that functionality for other future purposes. We have achieved that by passing the flags to the underlying jemalloc-related calls. See the above isc_mem_create_arena(), which can serve as an example of this. Having this opens up possibilities for creating memory contexts tuned for specific needs.
175 lines
3.2 KiB
C
175 lines
3.2 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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#pragma once
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#if !defined(HAVE_JEMALLOC)
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#include <stddef.h>
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#include <string.h>
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#include <isc/util.h>
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const char *malloc_conf = NULL;
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#define MALLOCX_ZERO ((int)0x40)
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#define MALLOCX_TCACHE_NONE (0)
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#define MALLOCX_ARENA(a) (0)
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#if defined(HAVE_MALLOC_SIZE) || defined(HAVE_MALLOC_USABLE_SIZE)
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#include <stdlib.h>
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#ifdef HAVE_MALLOC_SIZE
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#include <malloc/malloc.h>
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static inline size_t
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sallocx(void *ptr, int flags) {
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UNUSED(flags);
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return (malloc_size(ptr));
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}
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#elif HAVE_MALLOC_USABLE_SIZE
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#ifdef __DragonFly__
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/*
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* On DragonFly BSD 'man 3 malloc' advises us to include the following
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* header to have access to malloc_usable_size().
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*/
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#include <malloc_np.h>
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#else
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#include <malloc.h>
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#endif
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static inline size_t
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sallocx(void *ptr, int flags) {
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UNUSED(flags);
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return (malloc_usable_size(ptr));
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}
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#endif /* HAVE_MALLOC_SIZE */
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static inline void *
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mallocx(size_t size, int flags) {
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void *ptr = malloc(size);
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INSIST(ptr != NULL);
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if ((flags & MALLOCX_ZERO) != 0) {
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memset(ptr, 0, sallocx(ptr, flags));
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}
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return (ptr);
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}
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static inline void
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sdallocx(void *ptr, size_t size, int flags) {
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UNUSED(size);
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UNUSED(flags);
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free(ptr);
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}
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static inline void *
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rallocx(void *ptr, size_t size, int flags) {
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void *new_ptr;
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size_t old_size, new_size;
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REQUIRE(size != 0);
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if ((flags & MALLOCX_ZERO) != 0) {
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old_size = sallocx(ptr, flags);
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}
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new_ptr = realloc(ptr, size);
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INSIST(new_ptr != NULL);
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if ((flags & MALLOCX_ZERO) != 0) {
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new_size = sallocx(new_ptr, flags);
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if (new_size > old_size) {
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memset((uint8_t *)new_ptr + old_size, 0,
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new_size - old_size);
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}
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}
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return (new_ptr);
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}
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#else /* defined(HAVE_MALLOC_SIZE) || defined (HAVE_MALLOC_USABLE_SIZE) */
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#include <stdlib.h>
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typedef union {
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size_t size;
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max_align_t __alignment;
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} size_info;
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static inline void *
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mallocx(size_t size, int flags) {
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void *ptr = NULL;
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size_t bytes = ISC_CHECKED_ADD(size, sizeof(size_info));
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size_info *si = malloc(bytes);
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INSIST(si != NULL);
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si->size = size;
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ptr = &si[1];
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if ((flags & MALLOCX_ZERO) != 0) {
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memset(ptr, 0, size);
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}
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return (ptr);
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}
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static inline void
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sdallocx(void *ptr, size_t size, int flags) {
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size_info *si = &(((size_info *)ptr)[-1]);
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UNUSED(size);
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UNUSED(flags);
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free(si);
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}
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static inline size_t
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sallocx(void *ptr, int flags) {
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size_info *si = &(((size_info *)ptr)[-1]);
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UNUSED(flags);
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return (si[0].size);
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}
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static inline void *
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rallocx(void *ptr, size_t size, int flags) {
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size_info *si = realloc(&(((size_info *)ptr)[-1]), size + sizeof(*si));
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INSIST(si != NULL);
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if ((flags & MALLOCX_ZERO) != 0 && size > si->size) {
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memset((uint8_t *)si + sizeof(*si) + si->size, 0,
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size - si->size);
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}
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si->size = size;
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ptr = &si[1];
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return (ptr);
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}
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#endif /* defined(HAVE_MALLOC_SIZE) || defined (HAVE_MALLOC_USABLE_SIZE) */
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#endif /* !defined(HAVE_JEMALLOC) */
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