X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_eal%2Flinuxapp%2Feal%2Feal_hugepage_info.c;h=d602350b59267b63480eec6c1264129e93610510;hb=e1d09b00d7d486a6cbe2aaed999382bfc60ce1bf;hp=8f61d7c8542e42e538bbd17f67add60b21da2a89;hpb=99dde4b0e2f504b707ded1105c2f913db01689b9;p=dpdk.git diff --git a/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c b/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c index 8f61d7c854..d602350b59 100644 --- a/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c +++ b/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c @@ -1,35 +1,34 @@ /*- * BSD LICENSE - * - * Copyright(c) 2010-2013 Intel Corporation. All rights reserved. + * + * 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 + * + * 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 + * + * * 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 + * * 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 + * * 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 + * + * 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 @@ -48,7 +47,6 @@ #include #include -#include #include #include #include @@ -63,23 +61,24 @@ static const char sys_dir_path[] = "/sys/kernel/mm/hugepages"; -static int32_t +/* this function is only called from eal_hugepage_info_init which itself + * is only called from a primary process */ +static uint32_t get_num_hugepages(const char *subdir) { char path[PATH_MAX]; - long unsigned num_pages = 0; - const char *nr_hp_file; - - /* 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"; + long unsigned resv_pages, num_pages = 0; + const char *nr_hp_file = "free_hugepages"; + 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; - rte_snprintf(path, sizeof(path), "%s/%s/%s", + 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; @@ -87,7 +86,18 @@ get_num_hugepages(const char *subdir) RTE_LOG(WARNING, EAL, "No free hugepages reported in %s\n", subdir); - return (int32_t)num_pages; + /* adjust num_pages */ + if (num_pages >= resv_pages) + num_pages -= resv_pages; + else if (resv_pages) + num_pages = 0; + + /* we want to return a uint32_t and more than this looks suspicious + * anyway ... */ + if (num_pages > UINT32_MAX) + num_pages = UINT32_MAX; + + return num_pages; } static uint64_t @@ -269,64 +279,74 @@ 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; + struct dirent *dirent; - DIR *dir = opendir(sys_dir_path); + dir = opendir(sys_dir_path); if (dir == NULL) - rte_panic("Cannot open directory %s to read system hugepage info\n", - sys_dir_path); + 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]; + for (dirent = readdir(dir); dirent != NULL; dirent = readdir(dir)) { + struct hugepage_info *hpi; + + if (strncmp(dirent->d_name, dirent_start_text, + dirent_start_len) != 0) + continue; + + 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 { + if (hpi->hugedir == NULL) { + uint32_t num_pages; + + num_pages = get_num_hugepages(dirent->d_name); + if (num_pages > 0) + RTE_LOG(INFO, EAL, "%" PRIu32 " hugepages of size %" PRIu64 " reserved, " + "but no mounted hugetlbfs found for that size\n", + num_pages, hpi->hugepage_sz); + continue; + } + /* 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"); - return -1; + break; } /* clear out the hugepages dir from unused pages */ if (clear_hugedir(hpi->hugedir) == -1) - return -1; + break; /* 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_X86_64 +#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); + + /* something went wrong, and we broke from the for loop above */ + if (dirent != NULL) + return -1; + internal_config.num_hugepage_sizes = num_sizes; /* sort the page directory entries by size, largest to smallest */ - for (i = 0; i < num_sizes; i++){ + 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 < \ + 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]); @@ -335,7 +355,7 @@ eal_hugepage_info_init(void) /* 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) + internal_config.hugepage_info[i].num_pages[0] > 0) return 0; /* no valid hugepage mounts available, return error */