diff options
Diffstat (limited to 'src/dpdk_lib18/librte_eal/linuxapp/eal/eal_hugepage_info.c')
| -rwxr-xr-x | src/dpdk_lib18/librte_eal/linuxapp/eal/eal_hugepage_info.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/src/dpdk_lib18/librte_eal/linuxapp/eal/eal_hugepage_info.c b/src/dpdk_lib18/librte_eal/linuxapp/eal/eal_hugepage_info.c new file mode 100755 index 00000000..590cb565 --- /dev/null +++ b/src/dpdk_lib18/librte_eal/linuxapp/eal/eal_hugepage_info.c @@ -0,0 +1,359 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <string.h> +#include <sys/types.h> +#include <sys/file.h> +#include <dirent.h> +#include <stdint.h> +#include <stdlib.h> +#include <stdio.h> +#include <fnmatch.h> +#include <inttypes.h> +#include <stdarg.h> +#include <unistd.h> +#include <errno.h> +#include <sys/queue.h> + +#include <rte_memory.h> +#include <rte_memzone.h> +#include <rte_tailq.h> +#include <rte_eal.h> +#include <rte_launch.h> +#include <rte_per_lcore.h> +#include <rte_lcore.h> +#include <rte_debug.h> +#include <rte_log.h> +#include <rte_common.h> +#include "rte_string_fns.h" +#include "eal_internal_cfg.h" +#include "eal_hugepages.h" +#include "eal_filesystem.h" + +static const char sys_dir_path[] = "/sys/kernel/mm/hugepages"; + +static int32_t +get_num_hugepages(const char *subdir) +{ + char path[PATH_MAX]; + long unsigned resv_pages, num_pages = 0; + const char *nr_hp_file; + const char *nr_rsvd_file = "resv_hugepages"; + + /* first, check how many reserved pages kernel reports */ + snprintf(path, sizeof(path), "%s/%s/%s", + sys_dir_path, subdir, nr_rsvd_file); + + if (eal_parse_sysfs_value(path, &resv_pages) < 0) + return 0; + + /* if secondary process, just look at the number of hugepages, + * otherwise look at number of free hugepages */ + if (internal_config.process_type == RTE_PROC_SECONDARY) + nr_hp_file = "nr_hugepages"; + else + nr_hp_file = "free_hugepages"; + + memset(path, 0, sizeof(path)); + + snprintf(path, sizeof(path), "%s/%s/%s", + sys_dir_path, subdir, nr_hp_file); + + if (eal_parse_sysfs_value(path, &num_pages) < 0) + return 0; + + if (num_pages == 0) + RTE_LOG(WARNING, EAL, "No free hugepages reported in %s\n", + subdir); + + /* adjust num_pages in case of primary process */ + if (num_pages > 0 && internal_config.process_type == RTE_PROC_PRIMARY) + num_pages -= resv_pages; + + return (int32_t)num_pages; +} + +static uint64_t +get_default_hp_size(void) +{ + const char proc_meminfo[] = "/proc/meminfo"; + const char str_hugepagesz[] = "Hugepagesize:"; + unsigned hugepagesz_len = sizeof(str_hugepagesz) - 1; + char buffer[256]; + unsigned long long size = 0; + + FILE *fd = fopen(proc_meminfo, "r"); + if (fd == NULL) + rte_panic("Cannot open %s\n", proc_meminfo); + while(fgets(buffer, sizeof(buffer), fd)){ + if (strncmp(buffer, str_hugepagesz, hugepagesz_len) == 0){ + size = rte_str_to_size(&buffer[hugepagesz_len]); + break; + } + } + fclose(fd); + if (size == 0) + rte_panic("Cannot get default hugepage size from %s\n", proc_meminfo); + return size; +} + +static const char * +get_hugepage_dir(uint64_t hugepage_sz) +{ + enum proc_mount_fieldnames { + DEVICE = 0, + MOUNTPT, + FSTYPE, + OPTIONS, + _FIELDNAME_MAX + }; + static uint64_t default_size = 0; + const char proc_mounts[] = "/proc/mounts"; + const char hugetlbfs_str[] = "hugetlbfs"; + const size_t htlbfs_str_len = sizeof(hugetlbfs_str) - 1; + const char pagesize_opt[] = "pagesize="; + const size_t pagesize_opt_len = sizeof(pagesize_opt) - 1; + const char split_tok = ' '; + char *splitstr[_FIELDNAME_MAX]; + char buf[BUFSIZ]; + char *retval = NULL; + + FILE *fd = fopen(proc_mounts, "r"); + if (fd == NULL) + rte_panic("Cannot open %s\n", proc_mounts); + + if (default_size == 0) + default_size = get_default_hp_size(); + + while (fgets(buf, sizeof(buf), fd)){ + if (rte_strsplit(buf, sizeof(buf), splitstr, _FIELDNAME_MAX, + split_tok) != _FIELDNAME_MAX) { + RTE_LOG(ERR, EAL, "Error parsing %s\n", proc_mounts); + break; /* return NULL */ + } + + /* we have a specified --huge-dir option, only examine that dir */ + if (internal_config.hugepage_dir != NULL && + strcmp(splitstr[MOUNTPT], internal_config.hugepage_dir) != 0) + continue; + + if (strncmp(splitstr[FSTYPE], hugetlbfs_str, htlbfs_str_len) == 0){ + const char *pagesz_str = strstr(splitstr[OPTIONS], pagesize_opt); + + /* if no explicit page size, the default page size is compared */ + if (pagesz_str == NULL){ + if (hugepage_sz == default_size){ + retval = strdup(splitstr[MOUNTPT]); + break; + } + } + /* there is an explicit page size, so check it */ + else { + uint64_t pagesz = rte_str_to_size(&pagesz_str[pagesize_opt_len]); + if (pagesz == hugepage_sz) { + retval = strdup(splitstr[MOUNTPT]); + break; + } + } + } /* end if strncmp hugetlbfs */ + } /* end while fgets */ + + fclose(fd); + return retval; +} + +static inline void +swap_hpi(struct hugepage_info *a, struct hugepage_info *b) +{ + char buf[sizeof(*a)]; + memcpy(buf, a, sizeof(buf)); + memcpy(a, b, sizeof(buf)); + memcpy(b, buf, sizeof(buf)); +} + +/* + * Clear the hugepage directory of whatever hugepage files + * there are. Checks if the file is locked (i.e. + * if it's in use by another DPDK process). + */ +static int +clear_hugedir(const char * hugedir) +{ + DIR *dir; + struct dirent *dirent; + int dir_fd, fd, lck_result; + const char filter[] = "*map_*"; /* matches hugepage files */ + + /* open directory */ + dir = opendir(hugedir); + if (!dir) { + RTE_LOG(INFO, EAL, "Unable to open hugepage directory %s\n", + hugedir); + goto error; + } + dir_fd = dirfd(dir); + + dirent = readdir(dir); + if (!dirent) { + RTE_LOG(INFO, EAL, "Unable to read hugepage directory %s\n", + hugedir); + goto error; + } + + while(dirent != NULL){ + /* skip files that don't match the hugepage pattern */ + if (fnmatch(filter, dirent->d_name, 0) > 0) { + dirent = readdir(dir); + continue; + } + + /* try and lock the file */ + fd = openat(dir_fd, dirent->d_name, O_RDONLY); + + /* skip to next file */ + if (fd == -1) { + dirent = readdir(dir); + continue; + } + + /* non-blocking lock */ + lck_result = flock(fd, LOCK_EX | LOCK_NB); + + /* if lock succeeds, unlock and remove the file */ + if (lck_result != -1) { + flock(fd, LOCK_UN); + unlinkat(dir_fd, dirent->d_name, 0); + } + close (fd); + dirent = readdir(dir); + } + + closedir(dir); + return 0; + +error: + if (dir) + closedir(dir); + + RTE_LOG(INFO, EAL, "Error while clearing hugepage dir: %s\n", + strerror(errno)); + + return -1; +} + +/* + * when we initialize the hugepage info, everything goes + * to socket 0 by default. it will later get sorted by memory + * initialization procedure. + */ +int +eal_hugepage_info_init(void) +{ + const char dirent_start_text[] = "hugepages-"; + const size_t dirent_start_len = sizeof(dirent_start_text) - 1; + unsigned i, num_sizes = 0; + + DIR *dir = opendir(sys_dir_path); + if (dir == NULL) + rte_panic("Cannot open directory %s to read system hugepage info\n", + sys_dir_path); + + struct dirent *dirent = readdir(dir); + while(dirent != NULL){ + if (strncmp(dirent->d_name, dirent_start_text, dirent_start_len) == 0){ + struct hugepage_info *hpi = \ + &internal_config.hugepage_info[num_sizes]; + hpi->hugepage_sz = rte_str_to_size(&dirent->d_name[dirent_start_len]); + hpi->hugedir = get_hugepage_dir(hpi->hugepage_sz); + + /* first, check if we have a mountpoint */ + if (hpi->hugedir == NULL){ + int32_t num_pages; + if ((num_pages = get_num_hugepages(dirent->d_name)) > 0) + RTE_LOG(INFO, EAL, "%u hugepages of size %llu reserved, "\ + "but no mounted hugetlbfs found for that size\n", + (unsigned)num_pages, + (unsigned long long)hpi->hugepage_sz); + } else { + /* try to obtain a writelock */ + hpi->lock_descriptor = open(hpi->hugedir, O_RDONLY); + + /* if blocking lock failed */ + if (flock(hpi->lock_descriptor, LOCK_EX) == -1) { + RTE_LOG(CRIT, EAL, "Failed to lock hugepage directory!\n"); + closedir(dir); + return -1; + } + /* clear out the hugepages dir from unused pages */ + if (clear_hugedir(hpi->hugedir) == -1) { + closedir(dir); + return -1; + } + + /* for now, put all pages into socket 0, + * later they will be sorted */ + hpi->num_pages[0] = get_num_hugepages(dirent->d_name); + +#ifndef RTE_ARCH_64 + /* for 32-bit systems, limit number of hugepages to 1GB per page size */ + hpi->num_pages[0] = RTE_MIN(hpi->num_pages[0], + RTE_PGSIZE_1G / hpi->hugepage_sz); +#endif + + num_sizes++; + } + } + dirent = readdir(dir); + } + closedir(dir); + internal_config.num_hugepage_sizes = num_sizes; + + /* sort the page directory entries by size, largest to smallest */ + for (i = 0; i < num_sizes; i++){ + unsigned j; + for (j = i+1; j < num_sizes; j++) + if (internal_config.hugepage_info[j-1].hugepage_sz < \ + internal_config.hugepage_info[j].hugepage_sz) + swap_hpi(&internal_config.hugepage_info[j-1], + &internal_config.hugepage_info[j]); + } + + /* now we have all info, check we have at least one valid size */ + for (i = 0; i < num_sizes; i++) + if (internal_config.hugepage_info[i].hugedir != NULL && + internal_config.hugepage_info[i].num_pages[0] > 0) + return 0; + + /* no valid hugepage mounts available, return error */ + return -1; +} |