aoqi@0: /*
aoqi@0:  * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_MEMORY_ADAPTIVEFREELIST_HPP
aoqi@0: #define SHARE_VM_MEMORY_ADAPTIVEFREELIST_HPP
aoqi@0: 
aoqi@0: #include "memory/freeList.hpp"
aoqi@0: #include "gc_implementation/shared/allocationStats.hpp"
aoqi@0: 
aoqi@0: class CompactibleFreeListSpace;
aoqi@0: 
aoqi@0: // A class for maintaining a free list of Chunk's.  The FreeList
aoqi@0: // maintains a the structure of the list (head, tail, etc.) plus
aoqi@0: // statistics for allocations from the list.  The links between items
aoqi@0: // are not part of FreeList.  The statistics are
aoqi@0: // used to make decisions about coalescing Chunk's when they
aoqi@0: // are swept during collection.
aoqi@0: //
aoqi@0: // See the corresponding .cpp file for a description of the specifics
aoqi@0: // for that implementation.
aoqi@0: 
aoqi@0: class Mutex;
aoqi@0: 
aoqi@0: template <class Chunk>
aoqi@0: class AdaptiveFreeList : public FreeList<Chunk> {
aoqi@0:   friend class CompactibleFreeListSpace;
aoqi@0:   friend class VMStructs;
aoqi@0:   // friend class PrintTreeCensusClosure<Chunk, FreeList_t>;
aoqi@0: 
aoqi@0:   size_t        _hint;          // next larger size list with a positive surplus
aoqi@0: 
aoqi@0:   AllocationStats _allocation_stats; // allocation-related statistics
aoqi@0: 
aoqi@0:  public:
aoqi@0: 
aoqi@0:   AdaptiveFreeList();
aoqi@0: 
aoqi@0:   using FreeList<Chunk>::assert_proper_lock_protection;
aoqi@0: #ifdef ASSERT
aoqi@0:   using FreeList<Chunk>::protecting_lock;
aoqi@0: #endif
aoqi@0:   using FreeList<Chunk>::count;
aoqi@0:   using FreeList<Chunk>::size;
aoqi@0:   using FreeList<Chunk>::verify_chunk_in_free_list;
aoqi@0:   using FreeList<Chunk>::getFirstNChunksFromList;
aoqi@0:   using FreeList<Chunk>::print_on;
aoqi@0:   void return_chunk_at_head(Chunk* fc, bool record_return);
aoqi@0:   void return_chunk_at_head(Chunk* fc);
aoqi@0:   void return_chunk_at_tail(Chunk* fc, bool record_return);
aoqi@0:   void return_chunk_at_tail(Chunk* fc);
aoqi@0:   using FreeList<Chunk>::return_chunk_at_tail;
aoqi@0:   using FreeList<Chunk>::remove_chunk;
aoqi@0:   using FreeList<Chunk>::prepend;
aoqi@0:   using FreeList<Chunk>::print_labels_on;
aoqi@0:   using FreeList<Chunk>::get_chunk_at_head;
aoqi@0: 
aoqi@0:   // Initialize.
aoqi@0:   void initialize();
aoqi@0: 
aoqi@0:   // Reset the head, tail, hint, and count of a free list.
aoqi@0:   void reset(size_t hint);
aoqi@0: 
aoqi@0:   void assert_proper_lock_protection_work() const PRODUCT_RETURN;
aoqi@0: 
aoqi@0:   void print_on(outputStream* st, const char* c = NULL) const;
aoqi@0: 
aoqi@0:   size_t hint() const {
aoqi@0:     return _hint;
aoqi@0:   }
aoqi@0:   void set_hint(size_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     assert(v == 0 || size() < v, "Bad hint");
aoqi@0:     _hint = v;
aoqi@0:   }
aoqi@0: 
aoqi@0:   size_t get_better_size();
aoqi@0: 
aoqi@0:   // Accessors for statistics
aoqi@0:   void init_statistics(bool split_birth = false);
aoqi@0: 
aoqi@0:   AllocationStats* allocation_stats() {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     return &_allocation_stats;
aoqi@0:   }
aoqi@0: 
aoqi@0:   ssize_t desired() const {
aoqi@0:     return _allocation_stats.desired();
aoqi@0:   }
aoqi@0:   void set_desired(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_desired(v);
aoqi@0:   }
aoqi@0:   void compute_desired(float inter_sweep_current,
aoqi@0:                        float inter_sweep_estimate,
aoqi@0:                        float intra_sweep_estimate) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.compute_desired(count(),
aoqi@0:                                       inter_sweep_current,
aoqi@0:                                       inter_sweep_estimate,
aoqi@0:                                       intra_sweep_estimate);
aoqi@0:   }
aoqi@0:   ssize_t coal_desired() const {
aoqi@0:     return _allocation_stats.coal_desired();
aoqi@0:   }
aoqi@0:   void set_coal_desired(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_coal_desired(v);
aoqi@0:   }
aoqi@0: 
aoqi@0:   ssize_t surplus() const {
aoqi@0:     return _allocation_stats.surplus();
aoqi@0:   }
aoqi@0:   void set_surplus(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_surplus(v);
aoqi@0:   }
aoqi@0:   void increment_surplus() {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.increment_surplus();
aoqi@0:   }
aoqi@0:   void decrement_surplus() {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.decrement_surplus();
aoqi@0:   }
aoqi@0: 
aoqi@0:   ssize_t bfr_surp() const {
aoqi@0:     return _allocation_stats.bfr_surp();
aoqi@0:   }
aoqi@0:   void set_bfr_surp(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_bfr_surp(v);
aoqi@0:   }
aoqi@0:   ssize_t prev_sweep() const {
aoqi@0:     return _allocation_stats.prev_sweep();
aoqi@0:   }
aoqi@0:   void set_prev_sweep(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_prev_sweep(v);
aoqi@0:   }
aoqi@0:   ssize_t before_sweep() const {
aoqi@0:     return _allocation_stats.before_sweep();
aoqi@0:   }
aoqi@0:   void set_before_sweep(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_before_sweep(v);
aoqi@0:   }
aoqi@0: 
aoqi@0:   ssize_t coal_births() const {
aoqi@0:     return _allocation_stats.coal_births();
aoqi@0:   }
aoqi@0:   void set_coal_births(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_coal_births(v);
aoqi@0:   }
aoqi@0:   void increment_coal_births() {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.increment_coal_births();
aoqi@0:   }
aoqi@0: 
aoqi@0:   ssize_t coal_deaths() const {
aoqi@0:     return _allocation_stats.coal_deaths();
aoqi@0:   }
aoqi@0:   void set_coal_deaths(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_coal_deaths(v);
aoqi@0:   }
aoqi@0:   void increment_coal_deaths() {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.increment_coal_deaths();
aoqi@0:   }
aoqi@0: 
aoqi@0:   ssize_t split_births() const {
aoqi@0:     return _allocation_stats.split_births();
aoqi@0:   }
aoqi@0:   void set_split_births(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_split_births(v);
aoqi@0:   }
aoqi@0:   void increment_split_births() {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.increment_split_births();
aoqi@0:   }
aoqi@0: 
aoqi@0:   ssize_t split_deaths() const {
aoqi@0:     return _allocation_stats.split_deaths();
aoqi@0:   }
aoqi@0:   void set_split_deaths(ssize_t v) {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.set_split_deaths(v);
aoqi@0:   }
aoqi@0:   void increment_split_deaths() {
aoqi@0:     assert_proper_lock_protection();
aoqi@0:     _allocation_stats.increment_split_deaths();
aoqi@0:   }
aoqi@0: 
aoqi@0: #ifndef PRODUCT
aoqi@0:   // For debugging.  The "_returned_bytes" in all the lists are summed
aoqi@0:   // and compared with the total number of bytes swept during a
aoqi@0:   // collection.
aoqi@0:   size_t returned_bytes() const { return _allocation_stats.returned_bytes(); }
aoqi@0:   void set_returned_bytes(size_t v) { _allocation_stats.set_returned_bytes(v); }
aoqi@0:   void increment_returned_bytes_by(size_t v) {
aoqi@0:     _allocation_stats.set_returned_bytes(_allocation_stats.returned_bytes() + v);
aoqi@0:   }
aoqi@0:   // Stats verification
aoqi@0:   void verify_stats() const;
aoqi@0: #endif  // NOT PRODUCT
aoqi@0: };
aoqi@0: 
aoqi@0: #endif // SHARE_VM_MEMORY_ADAPTIVEFREELIST_HPP