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hotspot/src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.cpp

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+/*
+ * Copyright 2003-2005 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/_adjoiningVirtualSpaces.cpp.incl"
+
+AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs,
+                                               size_t min_low_byte_size,
+                                               size_t min_high_byte_size,
+                                               size_t alignment) :
+  _reserved_space(rs), _min_low_byte_size(min_low_byte_size),
+  _min_high_byte_size(min_high_byte_size), _low(0), _high(0),
+  _alignment(alignment) {}
+
+// The maximum byte sizes are for the initial layout of the
+// virtual spaces and are not the limit on the maximum bytes sizes.
+void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size,
+                                        size_t init_low_byte_size,
+                                        size_t init_high_byte_size) {
+
+  // The reserved spaces for the two parts of the virtual space.
+  ReservedSpace old_rs   = _reserved_space.first_part(max_low_byte_size);
+  ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size);
+
+  _low = new PSVirtualSpace(old_rs, alignment());
+  if (!_low->expand_by(init_low_byte_size)) {
+    vm_exit_during_initialization("Could not reserve enough space for "
+                                  "object heap");
+  }
+
+  _high = new PSVirtualSpaceHighToLow(young_rs, alignment());
+  if (!_high->expand_by(init_high_byte_size)) {
+    vm_exit_during_initialization("Could not reserve enough space for "
+                                  "object heap");
+  }
+}
+
+bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) {
+  assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
+  size_t actual_change = low()->expand_into(high(), change_in_bytes);
+  return actual_change != 0;
+}
+
+bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) {
+  assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
+  size_t actual_change = high()->expand_into(low(), change_in_bytes);
+  return actual_change != 0;
+}