2994 
2995 bool os::numa_topology_changed() { return false; }
2996 
2997 size_t os::numa_get_groups_num() {
2998   // Return just the number of nodes in which it's possible to allocate memory
2999   // (in numa terminology, configured nodes).
3000   return Linux::numa_num_configured_nodes();
3001 }
3002 
3003 int os::numa_get_group_id() {
3004   int cpu_id = Linux::sched_getcpu();
3005   if (cpu_id != -1) {
3006     int lgrp_id = Linux::get_node_by_cpu(cpu_id);
3007     if (lgrp_id != -1) {
3008       return lgrp_id;
3009     }
3010   }
3011   return 0;
3012 }
3013 


















3014 int os::Linux::get_existing_num_nodes() {
3015   int node;
3016   int highest_node_number = Linux::numa_max_node();
3017   int num_nodes = 0;
3018 
3019   // Get the total number of nodes in the system including nodes without memory.
3020   for (node = 0; node <= highest_node_number; node++) {
3021     if (is_node_in_existing_nodes(node)) {
3022       num_nodes++;
3023     }
3024   }
3025   return num_nodes;
3026 }
3027 
3028 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3029   int highest_node_number = Linux::numa_max_node();
3030   size_t i = 0;
3031 
3032   // Map all node ids in which it is possible to allocate memory. Also nodes are
3033   // not always consecutively available, i.e. available from 0 to the highest

2994 
2995 bool os::numa_topology_changed() { return false; }
2996 
2997 size_t os::numa_get_groups_num() {
2998   // Return just the number of nodes in which it's possible to allocate memory
2999   // (in numa terminology, configured nodes).
3000   return Linux::numa_num_configured_nodes();
3001 }
3002 
3003 int os::numa_get_group_id() {
3004   int cpu_id = Linux::sched_getcpu();
3005   if (cpu_id != -1) {
3006     int lgrp_id = Linux::get_node_by_cpu(cpu_id);
3007     if (lgrp_id != -1) {
3008       return lgrp_id;
3009     }
3010   }
3011   return 0;
3012 }
3013 
3014 int os::numa_get_address_id(uintptr_t addr) {
3015 #ifndef MPOL_F_NODE
3016 #define MPOL_F_NODE     (1<<0)  // Return next IL mode instead of node mask
3017 #endif
3018 
3019 #ifndef MPOL_F_ADDR
3020 #define MPOL_F_ADDR     (1<<1)  // Look up VMA using address
3021 #endif
3022   
3023   uint32_t id = (uint32_t)-1;
3024 
3025   if (syscall(SYS_get_mempolicy, &id, NULL, 0, addr, MPOL_F_NODE | MPOL_F_ADDR) == -1) {
3026     warning("Failed to get numa id at " PTR_FORMAT " with errno=%d", p2i((void*)addr), errno);
3027     return os::InvalidId;
3028   }
3029   return id;
3030 }
3031 
3032 int os::Linux::get_existing_num_nodes() {
3033   int node;
3034   int highest_node_number = Linux::numa_max_node();
3035   int num_nodes = 0;
3036 
3037   // Get the total number of nodes in the system including nodes without memory.
3038   for (node = 0; node <= highest_node_number; node++) {
3039     if (is_node_in_existing_nodes(node)) {
3040       num_nodes++;
3041     }
3042   }
3043   return num_nodes;
3044 }
3045 
3046 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3047   int highest_node_number = Linux::numa_max_node();
3048   size_t i = 0;
3049 
3050   // Map all node ids in which it is possible to allocate memory. Also nodes are
3051   // not always consecutively available, i.e. available from 0 to the highest