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