mem: take reserved hugepages into account

[dpdk.git] / lib / librte_eal / linuxapp / eal / eal_hugepage_info.c

diff --git a/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c b/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
index ef4cd1d..4ffeda5 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
+++ b/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
@@ -66,8 +66,16 @@ static int32_t
 get_num_hugepages(const char *subdir)
 {
        char path[PATH_MAX];
-       long unsigned num_pages = 0;
+       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 */
+       rte_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 */
@@ -76,6 +84,8 @@ get_num_hugepages(const char *subdir)
        else
                nr_hp_file = "free_hugepages";
 
+       memset(path, 0, sizeof(path));
+
        rte_snprintf(path, sizeof(path), "%s/%s/%s",
                        sys_dir_path, subdir, nr_hp_file);
 
@@ -86,6 +96,10 @@ get_num_hugepages(const char *subdir)
                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;
 }