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https://git.rwth-aachen.de/acs/public/villas/node/
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118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/** Hugepage memory allocator.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017-2018, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <strings.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/types.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 <villas/kernel/kernel.h>
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#include <villas/log.h>
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#include <villas/memory.h>
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#include <villas/utils.h>
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#include <villas/kernel/kernel.h>
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/** Allocate memory backed by hugepages with malloc() like interface */
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static struct memory_allocation * memory_hugepage_alloc(struct memory_type *m, size_t len, size_t alignment)
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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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int ret, fd = -1;
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size_t pgsz = kernel_get_page_size();
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size_t hugepgsz = kernel_get_hugepage_size();
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#ifdef __MACH__
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fd = VM_FLAGS_SUPERPAGE_SIZE_2MB;
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#elif defined(__linux__)
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flags |= MAP_HUGETLB;
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#endif
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struct memory_allocation *ma = alloc(sizeof(struct memory_allocation));
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if (!ma)
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return NULL;
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/** We must make sure that len is a multiple of the hugepage size
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*
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* See: https://lkml.org/lkml/2014/10/22/925
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*/
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ma->length = ALIGN(len, hugepgsz);
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ma->alignment = ALIGN(alignment, hugepgsz);
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ma->type = m;
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ma->address = mmap(NULL, ma->length, prot, flags, fd, 0);
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if (ma->address == MAP_FAILED) {
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warn("memory_hugepage_alloc: %s. Mapped as normal pages instead!", strerror(errno));
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//warn(" aligned=%#zx, length=%#zx", ma->alignment, ma->length);
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#ifdef __MACH__
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fd = -1;
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#elif defined(__linux__)
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flags &= ~MAP_HUGETLB;
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#endif
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ma->length = ALIGN(len, pgsz);
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ma->alignment = ALIGN(alignment, pgsz);
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ma->address = mmap(NULL, ma->length, prot, flags, fd, 0);
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if (ma->address == MAP_FAILED) {
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free(ma);
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return NULL;
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}
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}
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if (getuid() == 0) {
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ret = mlock(ma->address, ma->length);
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if (ret)
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return NULL;
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}
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return ma;
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}
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static int memory_hugepage_free(struct memory_type *m, struct memory_allocation *ma)
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{
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int ret;
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ret = munmap(ma->address, ma->length);
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if (ret)
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return ret;
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return 0;
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}
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struct memory_type memory_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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