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 }