src/hotspot/share/gc/g1/g1FullGCAdjustTask.cpp
author egahlin
Tue, 15 May 2018 20:24:34 +0200
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permissions -rw-r--r--
8199712: Flight Recorder Reviewed-by: coleenp, ihse, erikj, dsamersoff, mseledtsov, egahlin, mgronlun Contributed-by: erik.gahlin@oracle.com, markus.gronlund@oracle.com
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/*
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 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "gc/g1/g1CollectedHeap.hpp"
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#include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"
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#include "gc/g1/g1FullCollector.hpp"
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#include "gc/g1/g1FullGCAdjustTask.hpp"
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#include "gc/g1/g1FullGCCompactionPoint.hpp"
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#include "gc/g1/g1FullGCMarker.hpp"
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#include "gc/g1/g1FullGCOopClosures.inline.hpp"
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#include "gc/g1/heapRegion.inline.hpp"
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#include "gc/shared/gcTraceTime.inline.hpp"
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#include "gc/shared/referenceProcessor.hpp"
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#include "logging/log.hpp"
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class G1AdjustLiveClosure : public StackObj {
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  G1AdjustClosure* _adjust_closure;
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public:
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  G1AdjustLiveClosure(G1AdjustClosure* cl) :
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    _adjust_closure(cl) { }
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  size_t apply(oop object) {
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    return object->oop_iterate_size(_adjust_closure);
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  }
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};
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class G1AdjustRegionClosure : public HeapRegionClosure {
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  G1CMBitMap* _bitmap;
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  uint _worker_id;
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 public:
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  G1AdjustRegionClosure(G1CMBitMap* bitmap, uint worker_id) :
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    _bitmap(bitmap),
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    _worker_id(worker_id) { }
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  bool do_heap_region(HeapRegion* r) {
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    G1AdjustClosure cl;
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    if (r->is_humongous()) {
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      oop obj = oop(r->humongous_start_region()->bottom());
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      obj->oop_iterate(&cl, MemRegion(r->bottom(), r->top()));
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    } else if (r->is_open_archive()) {
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      // Only adjust the open archive regions, the closed ones
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      // never change.
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      G1AdjustLiveClosure adjust(&cl);
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      r->apply_to_marked_objects(_bitmap, &adjust);
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      // Open archive regions will not be compacted and the marking information is
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      // no longer needed. Clear it here to avoid having to do it later.
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      _bitmap->clear_region(r);
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    } else {
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      G1AdjustLiveClosure adjust(&cl);
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      r->apply_to_marked_objects(_bitmap, &adjust);
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    }
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    return false;
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  }
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};
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G1FullGCAdjustTask::G1FullGCAdjustTask(G1FullCollector* collector) :
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    G1FullGCTask("G1 Adjust", collector),
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    _root_processor(G1CollectedHeap::heap(), collector->workers()),
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    _hrclaimer(collector->workers()),
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    _adjust(),
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    _adjust_string_dedup(NULL, &_adjust, G1StringDedup::is_enabled()) {
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  // Need cleared claim bits for the roots processing
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  ClassLoaderDataGraph::clear_claimed_marks();
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}
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void G1FullGCAdjustTask::work(uint worker_id) {
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  Ticks start = Ticks::now();
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  ResourceMark rm;
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  // Adjust preserved marks first since they are not balanced.
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  G1FullGCMarker* marker = collector()->marker(worker_id);
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  marker->preserved_stack()->adjust_during_full_gc();
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  // Adjust the weak_roots.
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  CLDToOopClosure adjust_cld(&_adjust);
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  CodeBlobToOopClosure adjust_code(&_adjust, CodeBlobToOopClosure::FixRelocations);
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  _root_processor.process_full_gc_weak_roots(&_adjust);
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  // Needs to be last, process_all_roots calls all_tasks_completed(...).
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  _root_processor.process_all_roots(
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      &_adjust,
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      &adjust_cld,
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      &adjust_code);
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  // Adjust string dedup if enabled.
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  if (G1StringDedup::is_enabled()) {
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    G1StringDedup::parallel_unlink(&_adjust_string_dedup, worker_id);
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  }
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  // Now adjust pointers region by region
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  G1AdjustRegionClosure blk(collector()->mark_bitmap(), worker_id);
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  G1CollectedHeap::heap()->heap_region_par_iterate_from_worker_offset(&blk, &_hrclaimer, worker_id);
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  log_task("Adjust task", worker_id, start);
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}