| /* |
| * Copyright (c) 2012, 2014, 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc_implementation/concurrentMarkSweep/adaptiveFreeList.hpp" |
| #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" |
| #include "memory/freeBlockDictionary.hpp" |
| #include "memory/sharedHeap.hpp" |
| #include "runtime/globals.hpp" |
| #include "runtime/mutex.hpp" |
| #include "runtime/orderAccess.inline.hpp" |
| #include "runtime/vmThread.hpp" |
| |
| template <> |
| void AdaptiveFreeList<FreeChunk>::print_on(outputStream* st, const char* c) const { |
| if (c != NULL) { |
| st->print("%16s", c); |
| } else { |
| st->print(SIZE_FORMAT_W(16), size()); |
| } |
| st->print("\t" |
| SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" |
| SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\n", |
| bfr_surp(), surplus(), desired(), prev_sweep(), before_sweep(), |
| count(), coal_births(), coal_deaths(), split_births(), split_deaths()); |
| } |
| |
| template <class Chunk> |
| AdaptiveFreeList<Chunk>::AdaptiveFreeList() : FreeList<Chunk>(), _hint(0) { |
| init_statistics(); |
| } |
| |
| template <class Chunk> |
| void AdaptiveFreeList<Chunk>::initialize() { |
| FreeList<Chunk>::initialize(); |
| set_hint(0); |
| init_statistics(true /* split_birth */); |
| } |
| |
| template <class Chunk> |
| void AdaptiveFreeList<Chunk>::reset(size_t hint) { |
| FreeList<Chunk>::reset(); |
| set_hint(hint); |
| } |
| |
| #ifndef PRODUCT |
| template <class Chunk> |
| void AdaptiveFreeList<Chunk>::assert_proper_lock_protection_work() const { |
| assert(protecting_lock() != NULL, "Don't call this directly"); |
| assert(ParallelGCThreads > 0, "Don't call this directly"); |
| Thread* thr = Thread::current(); |
| if (thr->is_VM_thread() || thr->is_ConcurrentGC_thread()) { |
| // assert that we are holding the freelist lock |
| } else if (thr->is_GC_task_thread()) { |
| assert(protecting_lock()->owned_by_self(), "FreeList RACE DETECTED"); |
| } else if (thr->is_Java_thread()) { |
| assert(!SafepointSynchronize::is_at_safepoint(), "Should not be executing"); |
| } else { |
| ShouldNotReachHere(); // unaccounted thread type? |
| } |
| } |
| #endif |
| template <class Chunk> |
| void AdaptiveFreeList<Chunk>::init_statistics(bool split_birth) { |
| _allocation_stats.initialize(split_birth); |
| } |
| |
| template <class Chunk> |
| size_t AdaptiveFreeList<Chunk>::get_better_size() { |
| |
| // A candidate chunk has been found. If it is already under |
| // populated and there is a hinT, REturn the hint(). Else |
| // return the size of this chunk. |
| if (surplus() <= 0) { |
| if (hint() != 0) { |
| return hint(); |
| } else { |
| return size(); |
| } |
| } else { |
| // This list has a surplus so use it. |
| return size(); |
| } |
| } |
| |
| |
| template <class Chunk> |
| void AdaptiveFreeList<Chunk>::return_chunk_at_head(Chunk* chunk) { |
| assert_proper_lock_protection(); |
| return_chunk_at_head(chunk, true); |
| } |
| |
| template <class Chunk> |
| void AdaptiveFreeList<Chunk>::return_chunk_at_head(Chunk* chunk, bool record_return) { |
| FreeList<Chunk>::return_chunk_at_head(chunk, record_return); |
| #ifdef ASSERT |
| if (record_return) { |
| increment_returned_bytes_by(size()*HeapWordSize); |
| } |
| #endif |
| } |
| |
| template <class Chunk> |
| void AdaptiveFreeList<Chunk>::return_chunk_at_tail(Chunk* chunk) { |
| AdaptiveFreeList<Chunk>::return_chunk_at_tail(chunk, true); |
| } |
| |
| template <class Chunk> |
| void AdaptiveFreeList<Chunk>::return_chunk_at_tail(Chunk* chunk, bool record_return) { |
| FreeList<Chunk>::return_chunk_at_tail(chunk, record_return); |
| #ifdef ASSERT |
| if (record_return) { |
| increment_returned_bytes_by(size()*HeapWordSize); |
| } |
| #endif |
| } |
| |
| #ifndef PRODUCT |
| template <class Chunk> |
| void AdaptiveFreeList<Chunk>::verify_stats() const { |
| // The +1 of the LH comparand is to allow some "looseness" in |
| // checking: we usually call this interface when adding a block |
| // and we'll subsequently update the stats; we cannot update the |
| // stats beforehand because in the case of the large-block BT |
| // dictionary for example, this might be the first block and |
| // in that case there would be no place that we could record |
| // the stats (which are kept in the block itself). |
| assert((_allocation_stats.prev_sweep() + _allocation_stats.split_births() |
| + _allocation_stats.coal_births() + 1) // Total Production Stock + 1 |
| >= (_allocation_stats.split_deaths() + _allocation_stats.coal_deaths() |
| + (ssize_t)count()), // Total Current Stock + depletion |
| err_msg("FreeList " PTR_FORMAT " of size " SIZE_FORMAT |
| " violates Conservation Principle: " |
| "prev_sweep(" SIZE_FORMAT ")" |
| " + split_births(" SIZE_FORMAT ")" |
| " + coal_births(" SIZE_FORMAT ") + 1 >= " |
| " split_deaths(" SIZE_FORMAT ")" |
| " coal_deaths(" SIZE_FORMAT ")" |
| " + count(" SSIZE_FORMAT ")", |
| p2i(this), size(), _allocation_stats.prev_sweep(), _allocation_stats.split_births(), |
| _allocation_stats.coal_births(), _allocation_stats.split_deaths(), |
| _allocation_stats.coal_deaths(), count())); |
| } |
| #endif |
| |
| // Needs to be after the definitions have been seen. |
| template class AdaptiveFreeList<FreeChunk>; |