1 /*
   2  * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #include "gc/z/zErrno.hpp"
  25 #include "gc/z/zCPU.hpp"
  26 #include "gc/z/zNUMA.hpp"
  27 #include "runtime/os.hpp"
  28 #include "utilities/debug.hpp"
  29 
  30 #include <unistd.h>
  31 #include <sys/syscall.h>
  32 
  33 #ifndef MPOL_F_NODE
  34 #define MPOL_F_NODE     (1<<0)  /* return next IL mode instead of node mask */
  35 #endif
  36 
  37 #ifndef MPOL_F_ADDR
  38 #define MPOL_F_ADDR     (1<<1)  /* look up vma using address */
  39 #endif
  40 
  41 static int z_get_mempolicy(uint32_t* mode, const unsigned long *nmask, unsigned long maxnode, uintptr_t addr, int flags) {
  42   return syscall(__NR_get_mempolicy, mode, nmask, maxnode, addr, flags);
  43 }
  44 
  45 void ZNUMA::initialize_platform() {
  46   _enabled = UseNUMA;
  47 }
  48 
  49 uint32_t ZNUMA::count() {
  50   if (!_enabled) {
  51     // NUMA support not enabled
  52     return 1;
  53   }
  54 
  55   return os::Linux::numa_max_node() + 1;
  56 }
  57 
  58 uint32_t ZNUMA::id() {
  59   if (!_enabled) {
  60     // NUMA support not enabled
  61     return 0;
  62   }
  63 
  64   return os::Linux::get_node_by_cpu(ZCPU::id());
  65 }
  66 
  67 uint32_t ZNUMA::memory_id(uintptr_t addr) {
  68   if (!_enabled) {
  69     // NUMA support not enabled, assume everything belongs to node zero
  70     return 0;
  71   }
  72 
  73   uint32_t id = (uint32_t)-1;
  74 
  75   if (z_get_mempolicy(&id, NULL, 0, addr, MPOL_F_NODE | MPOL_F_ADDR) == -1) {
  76     ZErrno err;
  77     fatal("Failed to get NUMA id for memory at " PTR_FORMAT " (%s)", addr, err.to_string());
  78   }
  79 
  80   assert(id < count(), "Invalid NUMA id");
  81 
  82   return id;
  83 }