1 /*
   2  * Copyright (c) 2018, 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/z/zAddress.inline.hpp"
  26 #include "gc/z/zThreadLocalAllocBuffer.hpp"
  27 #include "gc/z/zValue.inline.hpp"
  28 #include "runtime/globals.hpp"
  29 #include "runtime/thread.hpp"
  30 
  31 ZPerWorker<ThreadLocalAllocStats>* ZThreadLocalAllocBuffer::_stats = NULL;
  32 
  33 void ZThreadLocalAllocBuffer::initialize() {
  34   if (UseTLAB) {
  35     assert(_stats == NULL, "Already initialized");
  36     _stats = new ZPerWorker<ThreadLocalAllocStats>();
  37     reset_statistics();
  38   }
  39 }
  40 
  41 void ZThreadLocalAllocBuffer::reset_statistics() {
  42   if (UseTLAB) {
  43     ZPerWorkerIterator<ThreadLocalAllocStats> iter(_stats);
  44     for (ThreadLocalAllocStats* stats; iter.next(&stats);) {
  45       stats->reset();
  46     }
  47   }
  48 }
  49 
  50 void ZThreadLocalAllocBuffer::publish_statistics() {
  51   if (UseTLAB) {
  52     ThreadLocalAllocStats total;
  53 
  54     ZPerWorkerIterator<ThreadLocalAllocStats> iter(_stats);
  55     for (ThreadLocalAllocStats* stats; iter.next(&stats);) {
  56       total.update(*stats);
  57     }
  58 
  59     total.publish();
  60   }
  61 }
  62 
  63 static void fixup_address(HeapWord** p) {
  64   *p = (HeapWord*)ZAddress::good_or_null((uintptr_t)*p);
  65 }
  66 
  67 void ZThreadLocalAllocBuffer::retire(Thread* thread) {
  68   if (UseTLAB && thread->is_Java_thread()) {
  69     ThreadLocalAllocStats* const stats = _stats->addr();
  70     thread->tlab().addresses_do(fixup_address);
  71     thread->tlab().retire(stats);
  72     if (ResizeTLAB) {
  73       thread->tlab().resize();
  74     }
  75   }
  76 }
  77 
  78 void ZThreadLocalAllocBuffer::remap(Thread* thread) {
  79   if (UseTLAB && thread->is_Java_thread()) {
  80     thread->tlab().addresses_do(fixup_address);
  81   }
  82 }