jdk

1
/*
2
 * Copyright (c) 2015, 2019, 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 "precompiled.hpp"
25
#include "gc/shared/gcLogPrecious.hpp"
26
#include "gc/x/xCPU.inline.hpp"
27
#include "memory/padded.inline.hpp"
28
#include "runtime/javaThread.hpp"
29
#include "runtime/os.hpp"
30
#include "utilities/debug.hpp"
31

32
#define XCPU_UNKNOWN_AFFINITY ((Thread*)-1)
33
#define XCPU_UNKNOWN_SELF     ((Thread*)-2)
34

35
PaddedEnd<XCPU::XCPUAffinity>* XCPU::_affinity = nullptr;
36
THREAD_LOCAL Thread*           XCPU::_self     = XCPU_UNKNOWN_SELF;
37
THREAD_LOCAL uint32_t          XCPU::_cpu      = 0;
38

39
void XCPU::initialize() {
40
  assert(_affinity == nullptr, "Already initialized");
41
  const uint32_t ncpus = count();
42

43
  _affinity = PaddedArray<XCPUAffinity, mtGC>::create_unfreeable(ncpus);
44

45
  for (uint32_t i = 0; i < ncpus; i++) {
46
    _affinity[i]._thread = XCPU_UNKNOWN_AFFINITY;
47
  }
48

49
  log_info_p(gc, init)("CPUs: %u total, %u available",
50
                       os::processor_count(),
51
                       os::initial_active_processor_count());
52
}
53

54
uint32_t XCPU::id_slow() {
55
  // Set current thread
56
  if (_self == XCPU_UNKNOWN_SELF) {
57
    _self = Thread::current();
58
  }
59

60
  // Set current CPU
61
  _cpu = os::processor_id();
62

63
  // Update affinity table
64
  _affinity[_cpu]._thread = _self;
65

66
  return _cpu;
67
}
68