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103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/** Memory allocators.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2016, Institute for Automation of Complex Power Systems, EONERC
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* This file is part of VILLASnode. All Rights Reserved. Proprietary and confidential.
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* Unauthorized copying of this file, via any medium is strictly prohibited.
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*/
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#include <stdlib.h>
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#include <sys/mman.h>
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/* Required to allocate hugepages on Apple OS X */
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#ifdef __MACH__
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#include <mach/vm_statistics.h>
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#endif
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#include "log.h"
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#include "memory.h"
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void * memory_alloc(const struct memtype *m, size_t len)
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{
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debug(LOG_MEM | 2, "Allocating %#zx bytes of %s memory", len, m->name);
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return m->alloc(len);
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}
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void * memory_alloc_aligned(const struct memtype *m, size_t len, size_t alignment)
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{
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debug(LOG_MEM | 2, "Allocating %#zx bytes of %#zx-byte-aligned %s memory", len, alignment, m->name);
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warn("%s: not implemented yet!", __FUNCTION__);
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return memory_alloc(m, len);
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}
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int memory_free(const struct memtype *m, void *ptr, size_t len)
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{
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debug(LOG_MEM | 2, "Releasing %#zx bytes of %s memory", len, m->name);
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return m->free(ptr, len);
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}
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static void * memory_heap_alloc(size_t len)
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{
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return malloc(len);
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}
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int memory_heap_free(void *ptr, size_t len)
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{
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free(ptr);
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return 0;
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}
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/** Allocate memory backed by hugepages with malloc() like interface */
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static void * memory_hugepage_alloc(size_t len)
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{
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int prot = PROT_READ | PROT_WRITE;
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int flags = MAP_PRIVATE | MAP_ANONYMOUS;
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#ifdef __MACH__
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flags |= VM_FLAGS_SUPERPAGE_SIZE_2MB;
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#elif defined(__linux__)
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flags |= MAP_HUGETLB | MAP_LOCKED;
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#endif
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void *ret = mmap(NULL, len, prot, flags, -1, 0);
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if (ret == MAP_FAILED) {
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info("Failed to allocate huge pages: Check https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt");
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return NULL;
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}
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return ret;
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}
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static int memory_hugepage_free(void *ptr, size_t len)
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{
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len = ALIGN(len, HUGEPAGESIZE); /* ugly see: https://lkml.org/lkml/2015/3/27/171 */
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return munmap(ptr, len);
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}
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/* List of available memory types */
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const struct memtype memtype_heap = {
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.name = "heap",
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.flags = MEMORY_HEAP,
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.alloc = memory_heap_alloc,
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.free = memory_heap_free,
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.alignment = 1
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};
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const struct memtype memtype_hugepage = {
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.name = "mmap_hugepages",
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.flags = MEMORY_MMAP | MEMORY_HUGEPAGE,
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.alloc = memory_hugepage_alloc,
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.free = memory_hugepage_free,
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.alignment = 21 /* 2 MiB hugepage */
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};
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/** @todo */
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const struct memtype memtype_dma = {
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.name = "dma",
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.flags = MEMORY_DMA | MEMORY_MMAP,
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.alloc = NULL, .free = NULL,
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.alignment = 12
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};
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