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/*
* Copyright (c) 2012, 2013, 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/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) {
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 ")",
this, size(), _allocation_stats.prev_sweep(), _allocation_stats.split_births(),
_allocation_stats.split_births(), _allocation_stats.split_deaths(),
_allocation_stats.coal_deaths(), count()));
}
#endif
// Needs to be after the definitions have been seen.
template class AdaptiveFreeList<FreeChunk>;
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