--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/parallel/psYoungGen.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2001, 2016, 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_PSYOUNGGEN_HPP
+#define SHARE_VM_GC_PARALLEL_PSYOUNGGEN_HPP
+
+#include "gc/parallel/mutableSpace.hpp"
+#include "gc/parallel/objectStartArray.hpp"
+#include "gc/parallel/psGenerationCounters.hpp"
+#include "gc/parallel/psVirtualspace.hpp"
+#include "gc/parallel/spaceCounters.hpp"
+
+class PSMarkSweepDecorator;
+
+class PSYoungGen : public CHeapObj<mtGC> {
+ friend class VMStructs;
+ friend class ParallelScavengeHeap;
+ friend class AdjoiningGenerations;
+
+ protected:
+ MemRegion _reserved;
+ PSVirtualSpace* _virtual_space;
+
+ // Spaces
+ MutableSpace* _eden_space;
+ MutableSpace* _from_space;
+ MutableSpace* _to_space;
+
+
+ // MarkSweep Decorators
+ PSMarkSweepDecorator* _eden_mark_sweep;
+ PSMarkSweepDecorator* _from_mark_sweep;
+ PSMarkSweepDecorator* _to_mark_sweep;
+
+ // Sizing information, in bytes, set in constructor
+ const size_t _init_gen_size;
+ const size_t _min_gen_size;
+ const size_t _max_gen_size;
+
+ // Performance counters
+ PSGenerationCounters* _gen_counters;
+ SpaceCounters* _eden_counters;
+ SpaceCounters* _from_counters;
+ SpaceCounters* _to_counters;
+
+ // Initialize the space boundaries
+ void compute_initial_space_boundaries();
+
+ // Space boundary helper
+ void set_space_boundaries(size_t eden_size, size_t survivor_size);
+
+ virtual bool resize_generation(size_t eden_size, size_t survivor_size);
+ virtual void resize_spaces(size_t eden_size, size_t survivor_size);
+
+ // Adjust the spaces to be consistent with the virtual space.
+ void post_resize();
+
+ // Return number of bytes that the generation can change.
+ // These should not be used by PSYoungGen
+ virtual size_t available_for_expansion();
+ virtual size_t available_for_contraction();
+
+ // Given a desired shrinkage in the size of the young generation,
+ // return the actual size available for shrinkage.
+ virtual size_t limit_gen_shrink(size_t desired_change);
+ // returns the number of bytes available from the current size
+ // down to the minimum generation size.
+ size_t available_to_min_gen();
+ // Return the number of bytes available for shrinkage considering
+ // the location the live data in the generation.
+ virtual size_t available_to_live();
+
+ public:
+ // Initialize the generation.
+ PSYoungGen(size_t initial_byte_size,
+ size_t minimum_byte_size,
+ size_t maximum_byte_size);
+ void initialize_work();
+ virtual void initialize(ReservedSpace rs, size_t alignment);
+ virtual void initialize_virtual_space(ReservedSpace rs, size_t alignment);
+
+ MemRegion reserved() const { return _reserved; }
+
+ bool is_in(const void* p) const {
+ return _virtual_space->contains((void *)p);
+ }
+
+ bool is_in_reserved(const void* p) const {
+ return reserved().contains((void *)p);
+ }
+
+ MutableSpace* eden_space() const { return _eden_space; }
+ MutableSpace* from_space() const { return _from_space; }
+ MutableSpace* to_space() const { return _to_space; }
+ PSVirtualSpace* virtual_space() const { return _virtual_space; }
+
+ // For Adaptive size policy
+ size_t min_gen_size() { return _min_gen_size; }
+
+ // MarkSweep support
+ PSMarkSweepDecorator* eden_mark_sweep() const { return _eden_mark_sweep; }
+ PSMarkSweepDecorator* from_mark_sweep() const { return _from_mark_sweep; }
+ PSMarkSweepDecorator* to_mark_sweep() const { return _to_mark_sweep; }
+
+ void precompact();
+ void adjust_pointers();
+ void compact();
+
+ // Called during/after GC
+ void swap_spaces();
+
+ // Resize generation using suggested free space size and survivor size
+ // NOTE: "eden_size" and "survivor_size" are suggestions only. Current
+ // heap layout (particularly, live objects in from space) might
+ // not allow us to use these values.
+ void resize(size_t eden_size, size_t survivor_size);
+
+ // Size info
+ size_t capacity_in_bytes() const;
+ size_t used_in_bytes() const;
+ size_t free_in_bytes() const;
+
+ size_t capacity_in_words() const;
+ size_t used_in_words() const;
+ size_t free_in_words() const;
+
+ // The max this generation can grow to
+ size_t max_size() const { return _reserved.byte_size(); }
+
+ // The max this generation can grow to if the boundary between
+ // the generations are allowed to move.
+ size_t gen_size_limit() const { return _max_gen_size; }
+
+ bool is_maximal_no_gc() const {
+ return true; // Never expands except at a GC
+ }
+
+ // Allocation
+ HeapWord* allocate(size_t word_size) {
+ HeapWord* result = eden_space()->cas_allocate(word_size);
+ return result;
+ }
+
+ HeapWord* volatile* top_addr() const { return eden_space()->top_addr(); }
+ HeapWord** end_addr() const { return eden_space()->end_addr(); }
+
+ // Iteration.
+ void oop_iterate(ExtendedOopClosure* cl);
+ void object_iterate(ObjectClosure* cl);
+
+ virtual void reset_after_change();
+ virtual void reset_survivors_after_shrink();
+
+ // Performance Counter support
+ void update_counters();
+
+ // Debugging - do not use for time critical operations
+ void print() const;
+ void print_on(outputStream* st) const;
+ void print_used_change(size_t prev_used) const;
+ virtual const char* name() const { return "PSYoungGen"; }
+
+ void verify();
+
+ // Space boundary invariant checker
+ void space_invariants() PRODUCT_RETURN;
+
+ // Helper for mangling survivor spaces.
+ void mangle_survivors(MutableSpace* s1,
+ MemRegion s1MR,
+ MutableSpace* s2,
+ MemRegion s2MR) PRODUCT_RETURN;
+
+ void record_spaces_top() PRODUCT_RETURN;
+};
+
+#endif // SHARE_VM_GC_PARALLEL_PSYOUNGGEN_HPP