Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/g1/g1StringDedupThread.cpp @ 20295:3f2894c5052e
8048112: G1 Full GC needs to support the case when the very first region is not available
Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett.
Reviewed-by: brutisso
author | tschatzl |
---|---|
date | Mon, 21 Jul 2014 10:00:31 +0200 |
parents | 581e70386ec9 |
children |
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/* * Copyright (c) 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/g1/g1Log.hpp" #include "gc_implementation/g1/g1StringDedup.hpp" #include "gc_implementation/g1/g1StringDedupTable.hpp" #include "gc_implementation/g1/g1StringDedupThread.hpp" #include "gc_implementation/g1/g1StringDedupQueue.hpp" G1StringDedupThread* G1StringDedupThread::_thread = NULL; G1StringDedupThread::G1StringDedupThread() : ConcurrentGCThread() { set_name("String Deduplication Thread"); 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; } void G1StringDedupThread::print_on(outputStream* st) const { st->print("\"%s\" ", name()); Thread::print_on(st); st->cr(); } void G1StringDedupThread::run() { G1StringDedupStat total_stat; initialize_in_thread(); wait_for_universe_init(); // 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; stat.mark_exec(); // 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.should_yield()) { stat.mark_block(); sts.yield(); stat.mark_unblock(); } } G1StringDedupTable::trim_entry_cache(); stat.mark_done(); // Print statistics total_stat.add(stat); print(gclog_or_tty, stat, total_stat); } } terminate(); } void G1StringDedupThread::stop() { { MonitorLockerEx ml(Terminator_lock); _thread->_should_terminate = true; } G1StringDedupQueue::cancel_wait(); { MonitorLockerEx ml(Terminator_lock); while (!_thread->_has_terminated) { ml.wait(); } } } void G1StringDedupThread::print(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat) { if (G1Log::fine() || PrintStringDeduplicationStatistics) { G1StringDedupStat::print_summary(st, last_stat, total_stat); if (PrintStringDeduplicationStatistics) { G1StringDedupStat::print_statistics(st, last_stat, false); G1StringDedupStat::print_statistics(st, total_stat, true); G1StringDedupTable::print_statistics(st); G1StringDedupQueue::print_statistics(st); } } }