Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/g1/g1StringDedup.cpp @ 18027:9f169829d0e1
Merge
author | asaha |
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date | Tue, 08 Jul 2014 13:25:13 -0700 |
parents | 1772223a25a2 |
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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 "classfile/javaClasses.hpp" #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" #include "gc_implementation/g1/g1GCPhaseTimes.hpp" #include "gc_implementation/g1/g1StringDedup.hpp" #include "gc_implementation/g1/g1StringDedupQueue.hpp" #include "gc_implementation/g1/g1StringDedupStat.hpp" #include "gc_implementation/g1/g1StringDedupTable.hpp" #include "gc_implementation/g1/g1StringDedupThread.hpp" bool G1StringDedup::_enabled = false; void G1StringDedup::initialize() { assert(UseG1GC, "String deduplication only available with G1"); if (UseStringDeduplication) { _enabled = true; G1StringDedupQueue::create(); G1StringDedupTable::create(); G1StringDedupThread::create(); } } void G1StringDedup::stop() { assert(is_enabled(), "String deduplication not enabled"); G1StringDedupThread::stop(); } bool G1StringDedup::is_candidate_from_mark(oop obj) { if (java_lang_String::is_instance(obj)) { bool from_young = G1CollectedHeap::heap()->heap_region_containing_raw(obj)->is_young(); if (from_young && obj->age() < StringDeduplicationAgeThreshold) { // Candidate found. String is being evacuated from young to old but has not // reached the deduplication age threshold, i.e. has not previously been a // candidate during its life in the young generation. return true; } } // Not a candidate return false; } void G1StringDedup::enqueue_from_mark(oop java_string) { assert(is_enabled(), "String deduplication not enabled"); if (is_candidate_from_mark(java_string)) { G1StringDedupQueue::push(0 /* worker_id */, java_string); } } bool G1StringDedup::is_candidate_from_evacuation(bool from_young, bool to_young, oop obj) { if (from_young && java_lang_String::is_instance(obj)) { if (to_young && obj->age() == StringDeduplicationAgeThreshold) { // Candidate found. String is being evacuated from young to young and just // reached the deduplication age threshold. return true; } if (!to_young && obj->age() < StringDeduplicationAgeThreshold) { // Candidate found. String is being evacuated from young to old but has not // reached the deduplication age threshold, i.e. has not previously been a // candidate during its life in the young generation. return true; } } // Not a candidate return false; } void G1StringDedup::enqueue_from_evacuation(bool from_young, bool to_young, uint worker_id, oop java_string) { assert(is_enabled(), "String deduplication not enabled"); if (is_candidate_from_evacuation(from_young, to_young, java_string)) { G1StringDedupQueue::push(worker_id, java_string); } } void G1StringDedup::deduplicate(oop java_string) { assert(is_enabled(), "String deduplication not enabled"); G1StringDedupStat dummy; // Statistics from this path is never used G1StringDedupTable::deduplicate(java_string, dummy); } void G1StringDedup::oops_do(OopClosure* keep_alive) { assert(is_enabled(), "String deduplication not enabled"); unlink_or_oops_do(NULL, keep_alive); } void G1StringDedup::unlink(BoolObjectClosure* is_alive) { assert(is_enabled(), "String deduplication not enabled"); // Don't allow a potential resize or rehash during unlink, as the unlink // operation itself might remove enough entries to invalidate such a decision. unlink_or_oops_do(is_alive, NULL, false /* allow_resize_and_rehash */); } // // Task for parallel unlink_or_oops_do() operation on the deduplication queue // and table. // class G1StringDedupUnlinkOrOopsDoTask : public AbstractGangTask { private: G1StringDedupUnlinkOrOopsDoClosure _cl; public: G1StringDedupUnlinkOrOopsDoTask(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool allow_resize_and_rehash) : AbstractGangTask("G1StringDedupUnlinkOrOopsDoTask"), _cl(is_alive, keep_alive, allow_resize_and_rehash) { } virtual void work(uint worker_id) { double queue_fixup_start = os::elapsedTime(); G1StringDedupQueue::unlink_or_oops_do(&_cl); double table_fixup_start = os::elapsedTime(); G1StringDedupTable::unlink_or_oops_do(&_cl, worker_id); double queue_fixup_time_ms = (table_fixup_start - queue_fixup_start) * 1000.0; double table_fixup_time_ms = (os::elapsedTime() - table_fixup_start) * 1000.0; G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); g1p->phase_times()->record_string_dedup_queue_fixup_worker_time(worker_id, queue_fixup_time_ms); g1p->phase_times()->record_string_dedup_table_fixup_worker_time(worker_id, table_fixup_time_ms); } }; void G1StringDedup::unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool allow_resize_and_rehash) { assert(is_enabled(), "String deduplication not enabled"); G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); g1p->phase_times()->note_string_dedup_fixup_start(); double fixup_start = os::elapsedTime(); G1StringDedupUnlinkOrOopsDoTask task(is_alive, keep_alive, allow_resize_and_rehash); if (G1CollectedHeap::use_parallel_gc_threads()) { G1CollectedHeap* g1h = G1CollectedHeap::heap(); g1h->set_par_threads(); g1h->workers()->run_task(&task); g1h->set_par_threads(0); } else { task.work(0); } double fixup_time_ms = (os::elapsedTime() - fixup_start) * 1000.0; g1p->phase_times()->record_string_dedup_fixup_time(fixup_time_ms); g1p->phase_times()->note_string_dedup_fixup_end(); } void G1StringDedup::threads_do(ThreadClosure* tc) { assert(is_enabled(), "String deduplication not enabled"); tc->do_thread(G1StringDedupThread::thread()); } void G1StringDedup::print_worker_threads_on(outputStream* st) { assert(is_enabled(), "String deduplication not enabled"); G1StringDedupThread::thread()->print_on(st); st->cr(); } void G1StringDedup::verify() { assert(is_enabled(), "String deduplication not enabled"); G1StringDedupQueue::verify(); G1StringDedupTable::verify(); } G1StringDedupUnlinkOrOopsDoClosure::G1StringDedupUnlinkOrOopsDoClosure(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool allow_resize_and_rehash) : _is_alive(is_alive), _keep_alive(keep_alive), _resized_table(NULL), _rehashed_table(NULL), _next_queue(0), _next_bucket(0) { if (allow_resize_and_rehash) { // If both resize and rehash is needed, only do resize. Rehash of // the table will eventually happen if the situation persists. _resized_table = G1StringDedupTable::prepare_resize(); if (!is_resizing()) { _rehashed_table = G1StringDedupTable::prepare_rehash(); } } } G1StringDedupUnlinkOrOopsDoClosure::~G1StringDedupUnlinkOrOopsDoClosure() { assert(!is_resizing() || !is_rehashing(), "Can not both resize and rehash"); if (is_resizing()) { G1StringDedupTable::finish_resize(_resized_table); } else if (is_rehashing()) { G1StringDedupTable::finish_rehash(_rehashed_table); } }