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src/share/vm/memory/metaspace.cpp

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rev 8910 : full patch for jfr
   1 /*
   2  * Copyright (c) 2011, 2018, 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  *


1118       dec_committed_words(vsl->committed_words());
1119       dec_virtual_space_count();
1120       purged_vsl = vsl;
1121       delete vsl;
1122     } else {
1123       prev_vsl = vsl;
1124     }
1125   }
1126 #ifdef ASSERT
1127   if (purged_vsl != NULL) {
1128     // List should be stable enough to use an iterator here.
1129     VirtualSpaceListIterator iter(virtual_space_list());
1130     while (iter.repeat()) {
1131       VirtualSpaceNode* vsl = iter.get_next();
1132       assert(vsl != purged_vsl, "Purge of vsl failed");
1133     }
1134   }
1135 #endif
1136 }
1137 
1138 
1139 // This function looks at the mmap regions in the metaspace without locking.
1140 // The chunks are added with store ordering and not deleted except for at
1141 // unloading time during a safepoint.
1142 bool VirtualSpaceList::contains(const void* ptr) {
1143   // List should be stable enough to use an iterator here because removing virtual
1144   // space nodes is only allowed at a safepoint.
1145   VirtualSpaceListIterator iter(virtual_space_list());
1146   while (iter.repeat()) {
1147     VirtualSpaceNode* vsn = iter.get_next();
1148     if (vsn->contains(ptr)) {
1149       return true;
1150     }
1151   }
1152   return false;
1153 }
1154 
1155 void VirtualSpaceList::retire_current_virtual_space() {
1156   assert_lock_strong(SpaceManager::expand_lock());
1157 
1158   VirtualSpaceNode* vsn = current_virtual_space();


   1 /*
   2  * Copyright (c) 2011, 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  *


1118       dec_committed_words(vsl->committed_words());
1119       dec_virtual_space_count();
1120       purged_vsl = vsl;
1121       delete vsl;
1122     } else {
1123       prev_vsl = vsl;
1124     }
1125   }
1126 #ifdef ASSERT
1127   if (purged_vsl != NULL) {
1128     // List should be stable enough to use an iterator here.
1129     VirtualSpaceListIterator iter(virtual_space_list());
1130     while (iter.repeat()) {
1131       VirtualSpaceNode* vsl = iter.get_next();
1132       assert(vsl != purged_vsl, "Purge of vsl failed");
1133     }
1134   }
1135 #endif
1136 }
1137 

1138 // This function looks at the mmap regions in the metaspace without locking.
1139 // The chunks are added with store ordering and not deleted except for at
1140 // unloading time during a safepoint.
1141 bool VirtualSpaceList::contains(const void* ptr) {
1142   // List should be stable enough to use an iterator here because removing virtual
1143   // space nodes is only allowed at a safepoint.
1144   VirtualSpaceListIterator iter(virtual_space_list());
1145   while (iter.repeat()) {
1146     VirtualSpaceNode* vsn = iter.get_next();
1147     if (vsn->contains(ptr)) {
1148       return true;
1149     }
1150   }
1151   return false;
1152 }
1153 
1154 void VirtualSpaceList::retire_current_virtual_space() {
1155   assert_lock_strong(SpaceManager::expand_lock());
1156 
1157   VirtualSpaceNode* vsn = current_virtual_space();


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