--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/parallel/mutableSpace.hpp Wed May 13 15:16:06 2015 +0200
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2001, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_PARALLEL_MUTABLESPACE_HPP
+#define SHARE_VM_GC_PARALLEL_MUTABLESPACE_HPP
+
+#include "gc/parallel/immutableSpace.hpp"
+#include "memory/memRegion.hpp"
+#include "utilities/copy.hpp"
+
+// A MutableSpace is a subtype of ImmutableSpace that supports the
+// concept of allocation. This includes the concepts that a space may
+// be only partially full, and the query methods that go with such
+// an assumption. MutableSpace is also responsible for minimizing the
+// page allocation time by having the memory pretouched (with
+// AlwaysPretouch) and for optimizing page placement on NUMA systems
+// by make the underlying region interleaved (with UseNUMA).
+//
+// Invariant: (ImmutableSpace +) bottom() <= top() <= end()
+// top() is inclusive and end() is exclusive.
+
+class MutableSpaceMangler;
+
+class MutableSpace: public ImmutableSpace {
+ friend class VMStructs;
+
+ // Helper for mangling unused space in debug builds
+ MutableSpaceMangler* _mangler;
+ // The last region which page had been setup to be interleaved.
+ MemRegion _last_setup_region;
+ size_t _alignment;
+ protected:
+ HeapWord* _top;
+
+ MutableSpaceMangler* mangler() { return _mangler; }
+
+ void numa_setup_pages(MemRegion mr, bool clear_space);
+ void pretouch_pages(MemRegion mr);
+
+ void set_last_setup_region(MemRegion mr) { _last_setup_region = mr; }
+ MemRegion last_setup_region() const { return _last_setup_region; }
+
+ public:
+ virtual ~MutableSpace();
+ MutableSpace(size_t page_size);
+
+ // Accessors
+ HeapWord* top() const { return _top; }
+ virtual void set_top(HeapWord* value) { _top = value; }
+
+ HeapWord** top_addr() { return &_top; }
+ HeapWord** end_addr() { return &_end; }
+
+ virtual void set_bottom(HeapWord* value) { _bottom = value; }
+ virtual void set_end(HeapWord* value) { _end = value; }
+
+ size_t alignment() { return _alignment; }
+
+ // Returns a subregion containing all objects in this space.
+ MemRegion used_region() { return MemRegion(bottom(), top()); }
+
+ static const bool SetupPages = true;
+ static const bool DontSetupPages = false;
+
+ // Initialization
+ virtual void initialize(MemRegion mr,
+ bool clear_space,
+ bool mangle_space,
+ bool setup_pages = SetupPages);
+
+ virtual void clear(bool mangle_space);
+ // Does the usual initialization but optionally resets top to bottom.
+#if 0 // MANGLE_SPACE
+ void initialize(MemRegion mr, bool clear_space, bool reset_top);
+#endif
+ virtual void update() { }
+ virtual void accumulate_statistics() { }
+
+ // Methods used in mangling. See descriptions under SpaceMangler.
+ virtual void mangle_unused_area() PRODUCT_RETURN;
+ virtual void mangle_unused_area_complete() PRODUCT_RETURN;
+ virtual void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
+ virtual void check_mangled_unused_area_complete() PRODUCT_RETURN;
+ virtual void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN;
+
+ // Used to save the space's current top for later use during mangling.
+ virtual void set_top_for_allocations() PRODUCT_RETURN;
+
+ virtual void ensure_parsability() { }
+
+ virtual void mangle_region(MemRegion mr) PRODUCT_RETURN;
+
+ // Boolean queries.
+ bool is_empty() const { return used_in_words() == 0; }
+ bool not_empty() const { return used_in_words() > 0; }
+ bool contains(const void* p) const { return _bottom <= p && p < _end; }
+
+ // Size computations. Sizes are in bytes.
+ size_t used_in_bytes() const { return used_in_words() * HeapWordSize; }
+ size_t free_in_bytes() const { return free_in_words() * HeapWordSize; }
+
+ // Size computations. Sizes are in heapwords.
+ virtual size_t used_in_words() const { return pointer_delta(top(), bottom()); }
+ virtual size_t free_in_words() const { return pointer_delta(end(), top()); }
+ virtual size_t tlab_capacity(Thread* thr) const { return capacity_in_bytes(); }
+ virtual size_t tlab_used(Thread* thr) const { return used_in_bytes(); }
+ virtual size_t unsafe_max_tlab_alloc(Thread* thr) const { return free_in_bytes(); }
+
+ // Allocation (return NULL if full)
+ virtual HeapWord* allocate(size_t word_size);
+ virtual HeapWord* cas_allocate(size_t word_size);
+ // Optional deallocation. Used in NUMA-allocator.
+ bool cas_deallocate(HeapWord *obj, size_t size);
+
+ // Iteration.
+ void oop_iterate(ExtendedOopClosure* cl);
+ void oop_iterate_no_header(OopClosure* cl);
+ void object_iterate(ObjectClosure* cl);
+
+ // Debugging
+ virtual void print() const;
+ virtual void print_on(outputStream* st) const;
+ virtual void print_short() const;
+ virtual void print_short_on(outputStream* st) const;
+ virtual void verify();
+};
+
+#endif // SHARE_VM_GC_PARALLEL_MUTABLESPACE_HPP