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44 #include <sys/types.h>
46 #include <sys/queue.h>
51 #include <sys/ioctl.h>
54 #include <rte_memory.h>
55 #include <rte_memzone.h>
56 #include <rte_launch.h>
57 #include <rte_tailq.h>
59 #include <rte_per_lcore.h>
60 #include <rte_lcore.h>
61 #include <rte_common.h>
62 #include <rte_string_fns.h>
64 #include "eal_private.h"
65 #include "eal_internal_cfg.h"
66 #include "eal_filesystem.h"
67 #include "eal_hugepages.h"
71 * Huge page mapping under linux
73 * To reserve a big contiguous amount of memory, we use the hugepage
74 * feature of linux. For that, we need to have hugetlbfs mounted. This
75 * code will create many files in this directory (one per page) and
76 * map them in virtual memory. For each page, we will retrieve its
77 * physical address and remap it in order to have a virtual contiguous
78 * zone as well as a physical contiguous zone.
82 #define RANDOMIZE_VA_SPACE_FILE "/proc/sys/kernel/randomize_va_space"
85 * Check whether address-space layout randomization is enabled in
86 * the kernel. This is important for multi-process as it can prevent
87 * two processes mapping data to the same virtual address
89 * 0 - address space randomization disabled
90 * 1/2 - address space randomization enabled
91 * negative error code on error
97 int retval, fd = open(RANDOMIZE_VA_SPACE_FILE, O_RDONLY);
100 retval = read(fd, &c, 1);
110 default: return -EINVAL;
115 * Try to mmap *size bytes in /dev/zero. If it is succesful, return the
116 * pointer to the mmap'd area and keep *size unmodified. Else, retry
117 * with a smaller zone: decrease *size by hugepage_sz until it reaches
118 * 0. In this case, return NULL. Note: this function returns an address
119 * which is a multiple of hugepage size.
122 get_virtual_area(uint64_t *size, uint64_t hugepage_sz)
128 RTE_LOG(INFO, EAL, "Ask a virtual area of 0x%"PRIx64" bytes\n", *size);
130 fd = open("/dev/zero", O_RDONLY);
132 RTE_LOG(ERR, EAL, "Cannot open /dev/zero\n");
136 addr = mmap(NULL, (*size) + hugepage_sz, PROT_READ, MAP_PRIVATE, fd, 0);
137 if (addr == MAP_FAILED)
138 *size -= hugepage_sz;
139 } while (addr == MAP_FAILED && *size > 0);
141 if (addr == MAP_FAILED) {
143 RTE_LOG(INFO, EAL, "Cannot get a virtual area\n");
147 munmap(addr, (*size) + hugepage_sz);
150 /* align addr to a huge page size boundary */
151 aligned_addr = (long)addr;
152 aligned_addr += (hugepage_sz - 1);
153 aligned_addr &= (~(hugepage_sz - 1));
154 addr = (void *)(aligned_addr);
156 RTE_LOG(INFO, EAL, "Virtual area found at %p (size = 0x%"PRIx64")\n",
163 * Mmap all hugepages of hugepage table: it first open a file in
164 * hugetlbfs, then mmap() hugepage_sz data in it. If orig is set, the
165 * virtual address is stored in hugepg_tbl[i].orig_va, else it is stored
166 * in hugepg_tbl[i].final_va. The second mapping (when orig is 0) tries to
167 * map continguous physical blocks in contiguous virtual blocks.
170 map_all_hugepages(struct hugepage *hugepg_tbl,
171 struct hugepage_info *hpi, int orig)
176 void *vma_addr = NULL;
177 uint64_t vma_len = 0;
179 for (i = 0; i < hpi->num_pages[0]; i++) {
180 uint64_t hugepage_sz = hpi->hugepage_sz;
183 hugepg_tbl[i].file_id = i;
184 hugepg_tbl[i].size = hugepage_sz;
185 eal_get_hugefile_path(hugepg_tbl[i].filepath,
186 sizeof(hugepg_tbl[i].filepath), hpi->hugedir,
187 hugepg_tbl[i].file_id);
188 hugepg_tbl[i].filepath[sizeof(hugepg_tbl[i].filepath) - 1] = '\0';
190 #ifndef RTE_ARCH_X86_64
191 /* for 32-bit systems, don't remap 1G pages, just reuse original
192 * map address as final map address.
194 else if (hugepage_sz == RTE_PGSIZE_1G){
195 hugepg_tbl[i].final_va = hugepg_tbl[i].orig_va;
196 hugepg_tbl[i].orig_va = NULL;
200 else if (vma_len == 0) {
201 unsigned j, num_pages;
203 /* reserve a virtual area for next contiguous
204 * physical block: count the number of
205 * contiguous physical pages. */
206 for (j = i+1; j < hpi->num_pages[0] ; j++) {
207 if (hugepg_tbl[j].physaddr !=
208 hugepg_tbl[j-1].physaddr + hugepage_sz)
212 vma_len = num_pages * hugepage_sz;
214 /* get the biggest virtual memory area up to
215 * vma_len. If it fails, vma_addr is NULL, so
216 * let the kernel provide the address. */
217 vma_addr = get_virtual_area(&vma_len, hpi->hugepage_sz);
218 if (vma_addr == NULL)
219 vma_len = hugepage_sz;
222 fd = open(hugepg_tbl[i].filepath, O_CREAT | O_RDWR, 0755);
224 RTE_LOG(ERR, EAL, "%s(): open failed: %s\n", __func__,
229 virtaddr = mmap(vma_addr, hugepage_sz, PROT_READ | PROT_WRITE,
231 if (virtaddr == MAP_FAILED) {
232 RTE_LOG(ERR, EAL, "%s(): mmap failed: %s\n", __func__,
239 hugepg_tbl[i].orig_va = virtaddr;
240 memset(virtaddr, 0, hugepage_sz);
243 hugepg_tbl[i].final_va = virtaddr;
246 vma_addr = (char *)vma_addr + hugepage_sz;
247 vma_len -= hugepage_sz;
253 /* Unmap all hugepages from original mapping. */
255 unmap_all_hugepages_orig(struct hugepage *hugepg_tbl, struct hugepage_info *hpi)
258 for (i = 0; i < hpi->num_pages[0]; i++) {
259 if (hugepg_tbl[i].orig_va) {
260 munmap(hugepg_tbl[i].orig_va, hpi->hugepage_sz);
261 hugepg_tbl[i].orig_va = NULL;
268 * For each hugepage in hugepg_tbl, fill the physaddr value. We find
269 * it by browsing the /proc/self/pagemap special file.
272 find_physaddr(struct hugepage *hugepg_tbl, struct hugepage_info *hpi)
277 unsigned long virt_pfn;
280 /* standard page size */
281 page_size = getpagesize();
283 fd = open("/proc/self/pagemap", O_RDONLY);
285 RTE_LOG(ERR, EAL, "%s(): cannot open /proc/self/pagemap: %s\n",
286 __func__, strerror(errno));
290 for (i = 0; i < hpi->num_pages[0]; i++) {
292 virt_pfn = (unsigned long)hugepg_tbl[i].orig_va /
294 offset = sizeof(uint64_t) * virt_pfn;
295 if (lseek(fd, offset, SEEK_SET) != offset){
296 RTE_LOG(ERR, EAL, "%s(): seek error in /proc/self/pagemap: %s\n",
297 __func__, strerror(errno));
301 if (read(fd, &page, sizeof(uint64_t)) < 0) {
302 RTE_LOG(ERR, EAL, "%s(): cannot read /proc/self/pagemap: %s\n",
303 __func__, strerror(errno));
309 * the pfn (page frame number) are bits 0-54 (see
310 * pagemap.txt in linux Documentation)
312 hugepg_tbl[i].physaddr = ((page & 0x7fffffffffffffULL) * page_size);
319 * Parse /proc/self/numa_maps to get the NUMA socket ID for each huge
323 find_numasocket(struct hugepage *hugepg_tbl, struct hugepage_info *hpi)
327 unsigned i, hp_count = 0;
330 char hugedir_str[PATH_MAX];
333 f = fopen("/proc/self/numa_maps", "r");
335 RTE_LOG(INFO, EAL, "cannot open /proc/self/numa_maps,"
336 " consider that all memory is in socket_id 0\n");
340 rte_snprintf(hugedir_str, sizeof(hugedir_str),
341 "%s/", hpi->hugedir);
344 while (fgets(buf, sizeof(buf), f) != NULL) {
346 /* ignore non huge page */
347 if (strstr(buf, " huge ") == NULL &&
348 strstr(buf, hugedir_str) == NULL)
352 virt_addr = strtoull(buf, &end, 16);
353 if (virt_addr == 0 || end == buf) {
354 RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
358 /* get node id (socket id) */
359 nodestr = strstr(buf, " N");
360 if (nodestr == NULL) {
361 RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
365 end = strstr(nodestr, "=");
367 RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
373 socket_id = strtoul(nodestr, &end, 0);
374 if ((nodestr[0] == '\0') || (end == NULL) || (*end != '\0')) {
375 RTE_LOG(ERR, EAL, "%s(): error in numa_maps parsing\n", __func__);
379 /* if we find this page in our mappings, set socket_id */
380 for (i = 0; i < hpi->num_pages[0]; i++) {
381 void *va = (void *)(unsigned long)virt_addr;
382 if (hugepg_tbl[i].orig_va == va) {
383 hugepg_tbl[i].socket_id = socket_id;
389 if (hp_count < hpi->num_pages[0])
401 * Sort the hugepg_tbl by physical address (lower addresses first). We
402 * use a slow algorithm, but we won't have millions of pages, and this
403 * is only done at init time.
406 sort_by_physaddr(struct hugepage *hugepg_tbl, struct hugepage_info *hpi)
410 uint64_t smallest_addr;
413 for (i = 0; i < hpi->num_pages[0]; i++) {
418 * browse all entries starting at 'i', and find the
419 * entry with the smallest addr
421 for (j=i; j< hpi->num_pages[0]; j++) {
423 if (smallest_addr == 0 ||
424 hugepg_tbl[j].physaddr < smallest_addr) {
425 smallest_addr = hugepg_tbl[j].physaddr;
430 /* should not happen */
431 if (smallest_idx == -1) {
432 RTE_LOG(ERR, EAL, "%s(): error in physaddr sorting\n", __func__);
436 /* swap the 2 entries in the table */
437 memcpy(&tmp, &hugepg_tbl[smallest_idx], sizeof(struct hugepage));
438 memcpy(&hugepg_tbl[smallest_idx], &hugepg_tbl[i],
439 sizeof(struct hugepage));
440 memcpy(&hugepg_tbl[i], &tmp, sizeof(struct hugepage));
446 * Uses mmap to create a shared memory area for storage of data
447 * Used in this file to store the hugepage file map on disk
450 create_shared_memory(const char *filename, const size_t mem_size)
453 int fd = open(filename, O_CREAT | O_RDWR, 0666);
456 if (ftruncate(fd, mem_size) < 0) {
460 retval = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
466 * this copies *active* hugepages from one hugepage table to another.
467 * destination is typically the shared memory.
470 copy_hugepages_to_shared_mem(struct hugepage * dst, int dest_size,
471 const struct hugepage * src, int src_size)
473 int src_pos, dst_pos = 0;
475 for (src_pos = 0; src_pos < src_size; src_pos++) {
476 if (src[src_pos].final_va != NULL) {
477 /* error on overflow attempt */
478 if (dst_pos == dest_size)
480 memcpy(&dst[dst_pos], &src[src_pos], sizeof(struct hugepage));
488 * unmaps hugepages that are not going to be used. since we originally allocate
489 * ALL hugepages (not just those we need), additional unmapping needs to be done.
492 unmap_unneeded_hugepages(struct hugepage *hugepg_tbl,
493 struct hugepage_info *hpi,
494 unsigned num_hp_info)
496 unsigned socket, size;
497 int page, nrpages = 0;
500 /* get total number of hugepages */
501 for (size = 0; size < num_hp_info; size++)
502 for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++)
503 nrpages += internal_config.hugepage_info[size].num_pages[socket];
505 for (size = 0; size < num_hp_info; size++) {
506 for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) {
507 unsigned pages_found = 0;
508 /* traverse until we have unmapped all the unused pages */
509 for (page = 0; page < nrpages; page++) {
510 struct hugepage *hp = &hugepg_tbl[page];
512 /* find a page that matches the criteria */
513 if ((hp->size == hpi[size].hugepage_sz) &&
514 (hp->socket_id == (int) socket)) {
516 /* if we skipped enough pages, unmap the rest */
517 if (pages_found == hpi[size].num_pages[socket]) {
518 munmap(hp->final_va, hp->size);
526 } /* foreach socket */
527 } /* foreach pagesize */
532 static inline uint64_t
533 get_socket_mem_size(int socket)
538 for (i = 0; i < internal_config.num_hugepage_sizes; i++){
539 struct hugepage_info *hpi = &internal_config.hugepage_info[i];
540 if (hpi->hugedir != NULL)
541 size += hpi->hugepage_sz * hpi->num_pages[socket];
548 * This function is a NUMA-aware equivalent of calc_num_pages.
549 * It takes in the list of hugepage sizes and the
550 * number of pages thereof, and calculates the best number of
551 * pages of each size to fulfill the request for <memory> ram
554 calc_num_pages_per_socket(uint64_t * memory,
555 struct hugepage_info *hp_info,
556 struct hugepage_info *hp_used,
557 unsigned num_hp_info)
559 unsigned socket, j, i = 0;
560 unsigned requested, available;
561 int total_num_pages = 0;
562 uint64_t remaining_mem, cur_mem;
563 uint64_t total_mem = internal_config.memory;
565 if (num_hp_info == 0)
568 for (socket = 0; socket < RTE_MAX_NUMA_NODES && total_mem != 0; socket++) {
569 /* if specific memory amounts per socket weren't requested */
570 if (internal_config.force_sockets == 0) {
571 /* take whatever is available */
572 memory[socket] = RTE_MIN(get_socket_mem_size(socket),
575 /* skips if the memory on specific socket wasn't requested */
576 for (i = 0; i < num_hp_info && memory[socket] != 0; i++){
577 hp_used[i].hugedir = hp_info[i].hugedir;
578 hp_used[i].num_pages[socket] = RTE_MIN(
579 memory[socket] / hp_info[i].hugepage_sz,
580 hp_info[i].num_pages[socket]);
582 cur_mem = hp_used[i].num_pages[socket] *
583 hp_used[i].hugepage_sz;
585 memory[socket] -= cur_mem;
586 total_mem -= cur_mem;
588 total_num_pages += hp_used[i].num_pages[socket];
590 /* check if we have met all memory requests */
591 if (memory[socket] == 0)
594 /* check if we have any more pages left at this size, if so
595 * move on to next size */
596 if (hp_used[i].num_pages[socket] == hp_info[i].num_pages[socket])
598 /* At this point we know that there are more pages available that are
599 * bigger than the memory we want, so lets see if we can get enough
600 * from other page sizes.
603 for (j = i+1; j < num_hp_info; j++)
604 remaining_mem += hp_info[j].hugepage_sz *
605 hp_info[j].num_pages[socket];
607 /* is there enough other memory, if not allocate another page and quit */
608 if (remaining_mem < memory[socket]){
609 cur_mem = RTE_MIN(memory[socket],
610 hp_info[i].hugepage_sz);
611 memory[socket] -= cur_mem;
612 total_mem -= cur_mem;
613 hp_used[i].num_pages[socket]++;
615 break; /* we are done with this socket*/
618 /* if we didn't satisfy all memory requirements per socket */
619 if (memory[socket] > 0) {
620 /* to prevent icc errors */
621 requested = (unsigned) (internal_config.socket_mem[socket] /
623 available = requested -
624 ((unsigned) (memory[socket] / 0x100000));
625 RTE_LOG(INFO, EAL, "Not enough memory available on socket %u! "
626 "Requested: %uMB, available: %uMB\n", socket,
627 requested, available);
632 /* if we didn't satisfy total memory requirements */
634 requested = (unsigned) (internal_config.memory / 0x100000);
635 available = requested - (unsigned) (total_mem / 0x100000);
636 RTE_LOG(INFO, EAL, "Not enough memory available! Requested: %uMB,"
637 " available: %uMB\n", requested, available);
640 return total_num_pages;
644 * Prepare physical memory mapping: fill configuration structure with
645 * these infos, return 0 on success.
646 * 1. map N huge pages in separate files in hugetlbfs
647 * 2. find associated physical addr
648 * 3. find associated NUMA socket ID
649 * 4. sort all huge pages by physical address
650 * 5. remap these N huge pages in the correct order
651 * 6. unmap the first mapping
652 * 7. fill memsegs in configuration with contiguous zones
655 rte_eal_hugepage_init(void)
657 struct rte_mem_config *mcfg;
658 struct hugepage *hugepage, *tmp_hp = NULL;
659 struct hugepage_info used_hp[MAX_HUGEPAGE_SIZES];
661 uint64_t memory[RTE_MAX_NUMA_NODES];
664 int i, j, new_memseg;
665 int nrpages, total_pages = 0;
668 memset(used_hp, 0, sizeof(used_hp));
670 /* get pointer to global configuration */
671 mcfg = rte_eal_get_configuration()->mem_config;
673 /* for debug purposes, hugetlbfs can be disabled */
674 if (internal_config.no_hugetlbfs) {
675 addr = malloc(internal_config.memory);
676 mcfg->memseg[0].phys_addr = (phys_addr_t)(uintptr_t)addr;
677 mcfg->memseg[0].addr = addr;
678 mcfg->memseg[0].len = internal_config.memory;
679 mcfg->memseg[0].socket_id = 0;
684 /* calculate total number of hugepages available. at this point we haven't
685 * yet started sorting them so they all are on socket 0 */
686 for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++) {
687 /* meanwhile, also initialize used_hp hugepage sizes in used_hp */
688 used_hp[i].hugepage_sz = internal_config.hugepage_info[i].hugepage_sz;
690 total_pages += internal_config.hugepage_info[i].num_pages[0];
694 * allocate a memory area for hugepage table.
695 * this isn't shared memory yet. due to the fact that we need some
696 * processing done on these pages, shared memory will be created
699 tmp_hp = malloc(total_pages * sizeof(struct hugepage));
703 memset(tmp_hp, 0, total_pages * sizeof(struct hugepage));
705 hp_offset = 0; /* where we start the current page size entries */
707 /* map all hugepages and sort them */
708 for (i = 0; i < (int)internal_config.num_hugepage_sizes; i ++){
709 struct hugepage_info *hpi;
712 * we don't yet mark hugepages as used at this stage, so
713 * we just map all hugepages available to the system
714 * all hugepages are still located on socket 0
716 hpi = &internal_config.hugepage_info[i];
718 if (hpi->num_pages == 0)
721 /* map all hugepages available */
722 if (map_all_hugepages(&tmp_hp[hp_offset], hpi, 1) < 0){
723 RTE_LOG(DEBUG, EAL, "Failed to mmap %u MB hugepages\n",
724 (unsigned)(hpi->hugepage_sz / 0x100000));
728 /* find physical addresses and sockets for each hugepage */
729 if (find_physaddr(&tmp_hp[hp_offset], hpi) < 0){
730 RTE_LOG(DEBUG, EAL, "Failed to find phys addr for %u MB pages\n",
731 (unsigned)(hpi->hugepage_sz / 0x100000));
735 if (find_numasocket(&tmp_hp[hp_offset], hpi) < 0){
736 RTE_LOG(DEBUG, EAL, "Failed to find NUMA socket for %u MB pages\n",
737 (unsigned)(hpi->hugepage_sz / 0x100000));
741 if (sort_by_physaddr(&tmp_hp[hp_offset], hpi) < 0)
744 /* remap all hugepages */
745 if (map_all_hugepages(&tmp_hp[hp_offset], hpi, 0) < 0){
746 RTE_LOG(DEBUG, EAL, "Failed to remap %u MB pages\n",
747 (unsigned)(hpi->hugepage_sz / 0x100000));
751 /* unmap original mappings */
752 if (unmap_all_hugepages_orig(&tmp_hp[hp_offset], hpi) < 0)
755 /* we have processed a num of hugepages of this size, so inc offset */
756 hp_offset += hpi->num_pages[0];
759 /* clean out the numbers of pages */
760 for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++)
761 for (j = 0; j < RTE_MAX_NUMA_NODES; j++)
762 internal_config.hugepage_info[i].num_pages[j] = 0;
764 /* get hugepages for each socket */
765 for (i = 0; i < total_pages; i++) {
766 int socket = tmp_hp[i].socket_id;
768 /* find a hugepage info with right size and increment num_pages */
769 for (j = 0; j < (int) internal_config.num_hugepage_sizes; j++) {
770 if (tmp_hp[i].size ==
771 internal_config.hugepage_info[j].hugepage_sz) {
772 internal_config.hugepage_info[j].num_pages[socket]++;
777 /* make a copy of socket_mem, needed for number of pages calculation */
778 for (i = 0; i < RTE_MAX_NUMA_NODES; i++)
779 memory[i] = internal_config.socket_mem[i];
781 /* calculate final number of pages */
782 nrpages = calc_num_pages_per_socket(memory,
783 internal_config.hugepage_info, used_hp,
784 internal_config.num_hugepage_sizes);
786 /* error if not enough memory available */
791 for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++) {
792 for (j = 0; j < RTE_MAX_NUMA_NODES; j++) {
793 if (used_hp[i].num_pages[j] > 0) {
795 "Requesting %u pages of size %uMB"
797 used_hp[i].num_pages[j],
799 (used_hp[i].hugepage_sz / 0x100000),
805 /* create shared memory */
806 hugepage = create_shared_memory(eal_hugepage_info_path(),
807 nrpages * sizeof(struct hugepage));
809 if (hugepage == NULL) {
810 RTE_LOG(ERR, EAL, "Failed to create shared memory!\n");
815 * unmap pages that we won't need (looks at used_hp).
816 * also, sets final_va to NULL on pages that were unmapped.
818 if (unmap_unneeded_hugepages(tmp_hp, used_hp,
819 internal_config.num_hugepage_sizes) < 0) {
820 RTE_LOG(ERR, EAL, "Unmapping and locking hugepages failed!\n");
825 * copy stuff from malloc'd hugepage* to the actual shared memory.
826 * this procedure only copies those hugepages that have final_va
827 * not NULL. has overflow protection.
829 if (copy_hugepages_to_shared_mem(hugepage, nrpages,
830 tmp_hp, total_pages) < 0) {
831 RTE_LOG(ERR, EAL, "Copying tables to shared memory failed!\n");
835 /* free the temporary hugepage table */
839 memset(mcfg->memseg, 0, sizeof(mcfg->memseg));
841 for (i = 0; i < nrpages; i++) {
844 /* if this is a new section, create a new memseg */
847 else if (hugepage[i].socket_id != hugepage[i-1].socket_id)
849 else if (hugepage[i].size != hugepage[i-1].size)
851 else if ((hugepage[i].physaddr - hugepage[i-1].physaddr) !=
854 else if (((unsigned long)hugepage[i].final_va -
855 (unsigned long)hugepage[i-1].final_va) != hugepage[i].size)
860 if (j == RTE_MAX_MEMSEG)
863 mcfg->memseg[j].phys_addr = hugepage[i].physaddr;
864 mcfg->memseg[j].addr = hugepage[i].final_va;
865 mcfg->memseg[j].len = hugepage[i].size;
866 mcfg->memseg[j].socket_id = hugepage[i].socket_id;
867 mcfg->memseg[j].hugepage_sz = hugepage[i].size;
869 /* continuation of previous memseg */
871 mcfg->memseg[j].len += mcfg->memseg[j].hugepage_sz;
873 hugepage[i].memseg_id = j;
886 * uses fstat to report the size of a file on disk
892 if (fstat(fd, &st) < 0)
898 * This creates the memory mappings in the secondary process to match that of
899 * the server process. It goes through each memory segment in the DPDK runtime
900 * configuration and finds the hugepages which form that segment, mapping them
901 * in order to form a contiguous block in the virtual memory space
904 rte_eal_hugepage_attach(void)
906 const struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
907 const struct hugepage *hp = NULL;
909 unsigned i, s = 0; /* s used to track the segment number */
911 int fd, fd_zero = -1, fd_hugepage = -1;
913 if (aslr_enabled() > 0) {
914 RTE_LOG(WARNING, EAL, "WARNING: Address Space Layout Randomization "
915 "(ASLR) is enabled in the kernel.\n");
916 RTE_LOG(WARNING, EAL, " This may cause issues with mapping memory "
917 "into secondary processes\n");
920 fd_zero = open("/dev/zero", O_RDONLY);
922 RTE_LOG(ERR, EAL, "Could not open /dev/zero\n");
925 fd_hugepage = open(eal_hugepage_info_path(), O_RDONLY);
926 if (fd_hugepage < 0) {
927 RTE_LOG(ERR, EAL, "Could not open %s\n", eal_hugepage_info_path());
931 size = getFileSize(fd_hugepage);
932 hp = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd_hugepage, 0);
934 RTE_LOG(ERR, EAL, "Could not mmap %s\n", eal_hugepage_info_path());
938 num_hp = size / sizeof(struct hugepage);
939 RTE_LOG(DEBUG, EAL, "Analysing %u hugepages\n", num_hp);
941 while (s < RTE_MAX_MEMSEG && mcfg->memseg[s].len > 0){
942 void *addr, *base_addr;
943 uintptr_t offset = 0;
945 /* fdzero is mmapped to get a contiguous block of virtual addresses
946 * get a block of free memory of the appropriate size -
947 * use mmap to attempt to get an identical address as server.
949 base_addr = mmap(mcfg->memseg[s].addr, mcfg->memseg[s].len,
950 PROT_READ, MAP_PRIVATE, fd_zero, 0);
951 if (base_addr == MAP_FAILED || base_addr != mcfg->memseg[s].addr) {
952 RTE_LOG(ERR, EAL, "Could not mmap %llu bytes "
953 "in /dev/zero to requested address [%p]\n",
954 (unsigned long long)mcfg->memseg[s].len,
955 mcfg->memseg[s].addr);
956 if (aslr_enabled() > 0)
957 RTE_LOG(ERR, EAL, "It is recommended to disable ASLR in the kernel "
958 "and retry running both primary and secondary processes\n");
961 /* free memory so we can map the hugepages into the space */
962 munmap(base_addr, mcfg->memseg[s].len);
964 /* find the hugepages for this segment and map them
965 * we don't need to worry about order, as the server sorted the
966 * entries before it did the second mmap of them */
967 for (i = 0; i < num_hp && offset < mcfg->memseg[s].len; i++){
968 if (hp[i].memseg_id == (int)s){
969 fd = open(hp[i].filepath, O_RDWR);
971 RTE_LOG(ERR, EAL, "Could not open %s\n",
975 addr = mmap(RTE_PTR_ADD(base_addr, offset),
976 hp[i].size, PROT_READ | PROT_WRITE,
977 MAP_SHARED | MAP_FIXED, fd, 0);
978 close(fd); /* close file both on success and on failure */
979 if (addr == MAP_FAILED) {
980 RTE_LOG(ERR, EAL, "Could not mmap %s\n",
987 RTE_LOG(DEBUG, EAL, "Mapped segment %u of size 0x%llx\n", s,
988 (unsigned long long)mcfg->memseg[s].len);
998 if (fd_hugepage >= 0)
1004 rte_eal_memdevice_init(void)
1006 struct rte_config *config;
1008 if (rte_eal_process_type() == RTE_PROC_SECONDARY)
1011 config = rte_eal_get_configuration();
1012 config->mem_config->nchannel = internal_config.force_nchannel;
1013 config->mem_config->nrank = internal_config.force_nrank;
1019 /* init memory subsystem */
1021 rte_eal_memory_init(void)
1023 RTE_LOG(INFO, EAL, "Setting up hugepage memory...\n");
1024 const int retval = rte_eal_process_type() == RTE_PROC_PRIMARY ?
1025 rte_eal_hugepage_init() :
1026 rte_eal_hugepage_attach();
1030 if (internal_config.no_shconf == 0 && rte_eal_memdevice_init() < 0)