| /* |
| * Copyright (c) 2014, 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/stringTable.hpp" |
| #include "gc/g1/g1StringDedup.hpp" |
| #include "gc/g1/g1StringDedupQueue.hpp" |
| #include "gc/g1/g1StringDedupTable.hpp" |
| #include "gc/g1/g1StringDedupThread.hpp" |
| #include "gc/g1/suspendibleThreadSet.hpp" |
| #include "logging/log.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/atomic.hpp" |
| |
| G1StringDedupThread* G1StringDedupThread::_thread = NULL; |
| |
| G1StringDedupThread::G1StringDedupThread() : |
| ConcurrentGCThread() { |
| set_name("G1 StrDedup"); |
| create_and_start(); |
| } |
| |
| G1StringDedupThread::~G1StringDedupThread() { |
| ShouldNotReachHere(); |
| } |
| |
| void G1StringDedupThread::create() { |
| assert(G1StringDedup::is_enabled(), "String deduplication not enabled"); |
| assert(_thread == NULL, "One string deduplication thread allowed"); |
| _thread = new G1StringDedupThread(); |
| } |
| |
| G1StringDedupThread* G1StringDedupThread::thread() { |
| assert(G1StringDedup::is_enabled(), "String deduplication not enabled"); |
| assert(_thread != NULL, "String deduplication thread not created"); |
| return _thread; |
| } |
| |
| class G1StringDedupSharedClosure: public OopClosure { |
| private: |
| G1StringDedupStat& _stat; |
| |
| public: |
| G1StringDedupSharedClosure(G1StringDedupStat& stat) : _stat(stat) {} |
| |
| virtual void do_oop(oop* p) { ShouldNotReachHere(); } |
| virtual void do_oop(narrowOop* p) { |
| oop java_string = oopDesc::load_decode_heap_oop(p); |
| G1StringDedupTable::deduplicate(java_string, _stat); |
| } |
| }; |
| |
| // The CDS archive does not include the string dedupication table. Only the string |
| // table is saved in the archive. The shared strings from CDS archive need to be |
| // added to the string dedupication table before deduplication occurs. That is |
| // done in the begining of the G1StringDedupThread (see G1StringDedupThread::run() |
| // below). |
| void G1StringDedupThread::deduplicate_shared_strings(G1StringDedupStat& stat) { |
| G1StringDedupSharedClosure sharedStringDedup(stat); |
| StringTable::shared_oops_do(&sharedStringDedup); |
| } |
| |
| void G1StringDedupThread::run_service() { |
| G1StringDedupStat total_stat; |
| |
| deduplicate_shared_strings(total_stat); |
| |
| // Main loop |
| for (;;) { |
| G1StringDedupStat stat; |
| |
| stat.mark_idle(); |
| |
| // Wait for the queue to become non-empty |
| G1StringDedupQueue::wait(); |
| if (should_terminate()) { |
| break; |
| } |
| |
| { |
| // Include thread in safepoints |
| SuspendibleThreadSetJoiner sts_join; |
| |
| stat.mark_exec(); |
| print_start(stat); |
| |
| // Process the queue |
| for (;;) { |
| oop java_string = G1StringDedupQueue::pop(); |
| if (java_string == NULL) { |
| break; |
| } |
| |
| G1StringDedupTable::deduplicate(java_string, stat); |
| |
| // Safepoint this thread if needed |
| if (sts_join.should_yield()) { |
| stat.mark_block(); |
| sts_join.yield(); |
| stat.mark_unblock(); |
| } |
| } |
| |
| stat.mark_done(); |
| |
| total_stat.add(stat); |
| print_end(stat, total_stat); |
| } |
| |
| G1StringDedupTable::clean_entry_cache(); |
| } |
| } |
| |
| void G1StringDedupThread::stop_service() { |
| G1StringDedupQueue::cancel_wait(); |
| } |
| |
| void G1StringDedupThread::print_start(const G1StringDedupStat& last_stat) { |
| G1StringDedupStat::print_start(last_stat); |
| } |
| |
| void G1StringDedupThread::print_end(const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat) { |
| G1StringDedupStat::print_end(last_stat, total_stat); |
| if (log_is_enabled(Debug, gc, stringdedup)) { |
| G1StringDedupStat::print_statistics(last_stat, false); |
| G1StringDedupStat::print_statistics(total_stat, true); |
| G1StringDedupTable::print_statistics(); |
| G1StringDedupQueue::print_statistics(); |
| } |
| } |