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hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp

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+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_cmsPermGen.cpp.incl"
+
+CMSPermGen::CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
+             CardTableRS* ct,
+             FreeBlockDictionary::DictionaryChoice dictionaryChoice) {
+  CMSPermGenGen* g =
+    new CMSPermGenGen(rs, initial_byte_size, -1, ct);
+  if (g == NULL) {
+    vm_exit_during_initialization("Could not allocate a CompactingPermGen");
+  }
+
+  g->initialize_performance_counters();
+
+  _gen = g;
+}
+
+HeapWord* CMSPermGen::mem_allocate(size_t size) {
+  Mutex* lock = _gen->freelistLock();
+  bool lock_owned = lock->owned_by_self();
+  if (lock_owned) {
+    MutexUnlocker mul(lock);
+    return mem_allocate_work(size);
+  } else {
+    return mem_allocate_work(size);
+  }
+}
+
+HeapWord* CMSPermGen::mem_allocate_work(size_t size) {
+  assert(!_gen->freelistLock()->owned_by_self(), "Potetntial deadlock");
+
+  MutexLocker ml(Heap_lock);
+  HeapWord* obj = NULL;
+
+  obj = _gen->allocate(size, false);
+  // Since we want to minimize pause times, we will prefer
+  // expanding the perm gen rather than doing a stop-world
+  // collection to satisfy the allocation request.
+  if (obj == NULL) {
+    // Try to expand the perm gen and allocate space.
+    obj = _gen->expand_and_allocate(size, false, false);
+    if (obj == NULL) {
+      // Let's see if a normal stop-world full collection will
+      // free up enough space.
+      SharedHeap::heap()->collect_locked(GCCause::_permanent_generation_full);
+      obj = _gen->allocate(size, false);
+      if (obj == NULL) {
+        // The collection above may have shrunk the space, so try
+        // to expand again and allocate space.
+        obj = _gen->expand_and_allocate(size, false, false);
+      }
+      if (obj == NULL) {
+        // We have not been able to allocate space despite a
+        // full stop-world collection. We now make a last-ditch collection
+        // attempt (in which soft refs are all aggressively freed)
+        // that will try to reclaim as much space as possible.
+        SharedHeap::heap()->collect_locked(GCCause::_last_ditch_collection);
+        obj = _gen->allocate(size, false);
+        if (obj == NULL) {
+          // Expand generation in case it was shrunk following the collection.
+          obj = _gen->expand_and_allocate(size, false, false);
+        }
+      }
+    }
+  }
+  return obj;
+}
+
+void CMSPermGen::compute_new_size() {
+  _gen->compute_new_size();
+}
+
+void CMSPermGenGen::initialize_performance_counters() {
+
+  const char* gen_name = "perm";
+
+  // Generation Counters - generation 2, 1 subspace
+  _gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space);
+
+  _gc_counters = NULL;
+
+  _space_counters = new GSpaceCounters(gen_name, 0,
+                                       _virtual_space.reserved_size(),
+                                       this, _gen_counters);
+}