diff -r fd16c54261b3 -r 489c9b5090e2 hotspot/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,182 @@ +/* + * Copyright 2001-2006 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. + * + */ + +class PSMarkSweepDecorator; + +class PSYoungGen : public CHeapObj { + 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(); + + // Parallel Old + void move_and_update(ParCompactionManager* cm); + + // 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, bool is_tlab) { + HeapWord* result = eden_space()->cas_allocate(word_size); + return result; + } + + HeapWord** top_addr() const { return eden_space()->top_addr(); } + HeapWord** end_addr() const { return eden_space()->end_addr(); } + + // Iteration. + void oop_iterate(OopClosure* 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(bool allow_dirty); + + // Space boundary invariant checker + void space_invariants() PRODUCT_RETURN; +};