src/hotspot/os_cpu/linux_x86/gc/z/zNUMA_linux_x86.cpp
branchniosocketimpl-branch
changeset 57277 d2b2a4edbfe7
parent 57275 222fa5ed1c91
parent 54216 f10ca228b22f
child 57278 bf925a3ee68a
equal deleted inserted replaced
57275:222fa5ed1c91 57277:d2b2a4edbfe7
     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 }