hotspot/src/share/vm/gc_implementation/g1/heapRegion.cpp
author johnc
Wed, 25 Apr 2012 10:23:12 -0700
changeset 12508 d76458352d62
parent 12382 6aaecb1cbfe1
child 13336 e582172ff6ff
permissions -rw-r--r--
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count Summary: Removed the HeapRegion::_top_at_conc_mark_count field. It is no longer needed as a result of the changes for 6888336 and 7127706. Refactored the closures that finalize and verify the liveness counting data so that common functionality was placed into a base class. Reviewed-by: brutisso, tonyp
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/*
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 * Copyright (c) 2001, 2012, 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_implementation/g1/g1BlockOffsetTable.inline.hpp"
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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#include "gc_implementation/g1/g1OopClosures.inline.hpp"
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#include "gc_implementation/g1/heapRegion.inline.hpp"
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#include "gc_implementation/g1/heapRegionRemSet.hpp"
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#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
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#include "memory/genOopClosures.inline.hpp"
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#include "memory/iterator.hpp"
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#include "oops/oop.inline.hpp"
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int    HeapRegion::LogOfHRGrainBytes = 0;
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int    HeapRegion::LogOfHRGrainWords = 0;
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size_t HeapRegion::GrainBytes        = 0;
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size_t HeapRegion::GrainWords        = 0;
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size_t HeapRegion::CardsPerRegion    = 0;
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HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1,
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                                 HeapRegion* hr, OopClosure* cl,
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                                 CardTableModRefBS::PrecisionStyle precision,
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                                 FilterKind fk) :
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  ContiguousSpaceDCTOC(hr, cl, precision, NULL),
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  _hr(hr), _fk(fk), _g1(g1)
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{ }
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FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r,
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                                                   OopClosure* oc) :
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  _r_bottom(r->bottom()), _r_end(r->end()),
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  _oc(oc), _out_of_region(0)
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{}
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class VerifyLiveClosure: public OopClosure {
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private:
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  G1CollectedHeap* _g1h;
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  CardTableModRefBS* _bs;
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  oop _containing_obj;
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  bool _failures;
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  int _n_failures;
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  VerifyOption _vo;
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public:
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  // _vo == UsePrevMarking -> use "prev" marking information,
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  // _vo == UseNextMarking -> use "next" marking information,
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  // _vo == UseMarkWord    -> use mark word from object header.
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  VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) :
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    _g1h(g1h), _bs(NULL), _containing_obj(NULL),
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    _failures(false), _n_failures(0), _vo(vo)
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  {
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    BarrierSet* bs = _g1h->barrier_set();
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    if (bs->is_a(BarrierSet::CardTableModRef))
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      _bs = (CardTableModRefBS*)bs;
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  }
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  void set_containing_obj(oop obj) {
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    _containing_obj = obj;
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  }
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  bool failures() { return _failures; }
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  int n_failures() { return _n_failures; }
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  virtual void do_oop(narrowOop* p) { do_oop_work(p); }
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  virtual void do_oop(      oop* p) { do_oop_work(p); }
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  void print_object(outputStream* out, oop obj) {
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#ifdef PRODUCT
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    klassOop k = obj->klass();
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    const char* class_name = instanceKlass::cast(k)->external_name();
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    out->print_cr("class name %s", class_name);
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#else // PRODUCT
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    obj->print_on(out);
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#endif // PRODUCT
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  }
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  template <class T>
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  void do_oop_work(T* p) {
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    assert(_containing_obj != NULL, "Precondition");
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    assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo),
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           "Precondition");
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    T heap_oop = oopDesc::load_heap_oop(p);
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    if (!oopDesc::is_null(heap_oop)) {
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      oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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      bool failed = false;
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      if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) {
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        MutexLockerEx x(ParGCRareEvent_lock,
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                        Mutex::_no_safepoint_check_flag);
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        if (!_failures) {
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          gclog_or_tty->print_cr("");
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          gclog_or_tty->print_cr("----------");
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        }
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        if (!_g1h->is_in_closed_subset(obj)) {
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          HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
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          gclog_or_tty->print_cr("Field "PTR_FORMAT
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                                 " of live obj "PTR_FORMAT" in region "
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                                 "["PTR_FORMAT", "PTR_FORMAT")",
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                                 p, (void*) _containing_obj,
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                                 from->bottom(), from->end());
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          print_object(gclog_or_tty, _containing_obj);
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          gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap",
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                                 (void*) obj);
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        } else {
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          HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
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          HeapRegion* to   = _g1h->heap_region_containing((HeapWord*)obj);
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          gclog_or_tty->print_cr("Field "PTR_FORMAT
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                                 " of live obj "PTR_FORMAT" in region "
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                                 "["PTR_FORMAT", "PTR_FORMAT")",
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                                 p, (void*) _containing_obj,
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                                 from->bottom(), from->end());
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          print_object(gclog_or_tty, _containing_obj);
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          gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region "
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                                 "["PTR_FORMAT", "PTR_FORMAT")",
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                                 (void*) obj, to->bottom(), to->end());
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          print_object(gclog_or_tty, obj);
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        }
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        gclog_or_tty->print_cr("----------");
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        gclog_or_tty->flush();
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        _failures = true;
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        failed = true;
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        _n_failures++;
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      }
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      if (!_g1h->full_collection()) {
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        HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
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        HeapRegion* to   = _g1h->heap_region_containing(obj);
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        if (from != NULL && to != NULL &&
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            from != to &&
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            !to->isHumongous()) {
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          jbyte cv_obj = *_bs->byte_for_const(_containing_obj);
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          jbyte cv_field = *_bs->byte_for_const(p);
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          const jbyte dirty = CardTableModRefBS::dirty_card_val();
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          bool is_bad = !(from->is_young()
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                          || to->rem_set()->contains_reference(p)
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                          || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed
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                              (_containing_obj->is_objArray() ?
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                                  cv_field == dirty
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                               : cv_obj == dirty || cv_field == dirty));
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          if (is_bad) {
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            MutexLockerEx x(ParGCRareEvent_lock,
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                            Mutex::_no_safepoint_check_flag);
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            if (!_failures) {
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              gclog_or_tty->print_cr("");
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              gclog_or_tty->print_cr("----------");
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            }
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            gclog_or_tty->print_cr("Missing rem set entry:");
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            gclog_or_tty->print_cr("Field "PTR_FORMAT" "
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                                   "of obj "PTR_FORMAT", "
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                                   "in region "HR_FORMAT,
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                                   p, (void*) _containing_obj,
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                                   HR_FORMAT_PARAMS(from));
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            _containing_obj->print_on(gclog_or_tty);
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            gclog_or_tty->print_cr("points to obj "PTR_FORMAT" "
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                                   "in region "HR_FORMAT,
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                                   (void*) obj,
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                                   HR_FORMAT_PARAMS(to));
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            obj->print_on(gclog_or_tty);
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            gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.",
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                          cv_obj, cv_field);
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            gclog_or_tty->print_cr("----------");
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            gclog_or_tty->flush();
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            _failures = true;
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            if (!failed) _n_failures++;
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          }
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        }
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      }
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    }
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  }
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};
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template<class ClosureType>
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HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h,
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                               HeapRegion* hr,
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                               HeapWord* cur, HeapWord* top) {
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  oop cur_oop = oop(cur);
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  int oop_size = cur_oop->size();
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  HeapWord* next_obj = cur + oop_size;
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  while (next_obj < top) {
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    // Keep filtering the remembered set.
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    if (!g1h->is_obj_dead(cur_oop, hr)) {
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      // Bottom lies entirely below top, so we can call the
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      // non-memRegion version of oop_iterate below.
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      cur_oop->oop_iterate(cl);
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    }
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    cur = next_obj;
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    cur_oop = oop(cur);
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    oop_size = cur_oop->size();
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    next_obj = cur + oop_size;
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  }
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  return cur;
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}
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void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr,
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                                              HeapWord* bottom,
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                                              HeapWord* top,
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                                              OopClosure* cl) {
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  G1CollectedHeap* g1h = _g1;
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  int oop_size;
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  OopClosure* cl2 = NULL;
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  FilterIntoCSClosure intoCSFilt(this, g1h, cl);
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  FilterOutOfRegionClosure outOfRegionFilt(_hr, cl);
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  switch (_fk) {
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  case NoFilterKind:          cl2 = cl; break;
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  case IntoCSFilterKind:      cl2 = &intoCSFilt; break;
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  case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break;
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  default:                    ShouldNotReachHere();
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  }
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  // Start filtering what we add to the remembered set. If the object is
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  // not considered dead, either because it is marked (in the mark bitmap)
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  // or it was allocated after marking finished, then we add it. Otherwise
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  // we can safely ignore the object.
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  if (!g1h->is_obj_dead(oop(bottom), _hr)) {
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    oop_size = oop(bottom)->oop_iterate(cl2, mr);
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  } else {
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    oop_size = oop(bottom)->size();
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  }
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  bottom += oop_size;
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  if (bottom < top) {
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    // We replicate the loop below for several kinds of possible filters.
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    switch (_fk) {
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    case NoFilterKind:
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      bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top);
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      break;
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    case IntoCSFilterKind: {
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      FilterIntoCSClosure filt(this, g1h, cl);
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      bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top);
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      break;
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   257
    }
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    case OutOfRegionFilterKind: {
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      FilterOutOfRegionClosure filt(_hr, cl);
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      bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top);
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      break;
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   263
    }
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    default:
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      ShouldNotReachHere();
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    }
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    // Last object. Need to do dead-obj filtering here too.
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    if (!g1h->is_obj_dead(oop(bottom), _hr)) {
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      oop(bottom)->oop_iterate(cl2, mr);
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    }
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  }
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}
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// Minimum region size; we won't go lower than that.
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// We might want to decrease this in the future, to deal with small
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// heaps a bit more efficiently.
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#define MIN_REGION_SIZE  (      1024 * 1024 )
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// Maximum region size; we don't go higher than that. There's a good
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// reason for having an upper bound. We don't want regions to get too
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// large, otherwise cleanup's effectiveness would decrease as there
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// will be fewer opportunities to find totally empty regions after
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// marking.
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#define MAX_REGION_SIZE  ( 32 * 1024 * 1024 )
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// The automatic region size calculation will try to have around this
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// many regions in the heap (based on the min heap size).
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#define TARGET_REGION_NUMBER          2048
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void HeapRegion::setup_heap_region_size(uintx min_heap_size) {
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  // region_size in bytes
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  uintx region_size = G1HeapRegionSize;
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  if (FLAG_IS_DEFAULT(G1HeapRegionSize)) {
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    // We base the automatic calculation on the min heap size. This
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    // can be problematic if the spread between min and max is quite
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    // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on
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    // the max size, the region size might be way too large for the
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    // min size. Either way, some users might have to set the region
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    // size manually for some -Xms / -Xmx combos.
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    region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER,
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                       (uintx) MIN_REGION_SIZE);
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  }
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  int region_size_log = log2_long((jlong) region_size);
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  // Recalculate the region size to make sure it's a power of
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  // 2. This means that region_size is the largest power of 2 that's
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  // <= what we've calculated so far.
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  region_size = ((uintx)1 << region_size_log);
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  // Now make sure that we don't go over or under our limits.
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  if (region_size < MIN_REGION_SIZE) {
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    region_size = MIN_REGION_SIZE;
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  } else if (region_size > MAX_REGION_SIZE) {
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    region_size = MAX_REGION_SIZE;
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  }
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  // And recalculate the log.
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  region_size_log = log2_long((jlong) region_size);
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  // Now, set up the globals.
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  guarantee(LogOfHRGrainBytes == 0, "we should only set it once");
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  LogOfHRGrainBytes = region_size_log;
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   326
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  guarantee(LogOfHRGrainWords == 0, "we should only set it once");
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  LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize;
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   329
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  guarantee(GrainBytes == 0, "we should only set it once");
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  // The cast to int is safe, given that we've bounded region_size by
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  // MIN_REGION_SIZE and MAX_REGION_SIZE.
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  GrainBytes = (size_t)region_size;
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   334
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  guarantee(GrainWords == 0, "we should only set it once");
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  GrainWords = GrainBytes >> LogHeapWordSize;
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  guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity");
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   338
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  guarantee(CardsPerRegion == 0, "we should only set it once");
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  CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift;
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   341
}
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   342
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void HeapRegion::reset_after_compaction() {
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  G1OffsetTableContigSpace::reset_after_compaction();
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  // After a compaction the mark bitmap is invalid, so we must
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  // treat all objects as being inside the unmarked area.
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  zero_marked_bytes();
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  init_top_at_mark_start();
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}
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void HeapRegion::hr_clear(bool par, bool clear_space) {
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  assert(_humongous_type == NotHumongous,
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         "we should have already filtered out humongous regions");
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  assert(_humongous_start_region == NULL,
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         "we should have already filtered out humongous regions");
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  assert(_end == _orig_end,
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         "we should have already filtered out humongous regions");
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   358
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  _in_collection_set = false;
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  set_young_index_in_cset(-1);
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  uninstall_surv_rate_group();
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  set_young_type(NotYoung);
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  reset_pre_dummy_top();
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   365
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  if (!par) {
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    // If this is parallel, this will be done later.
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    HeapRegionRemSet* hrrs = rem_set();
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    if (hrrs != NULL) hrrs->clear();
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    _claimed = InitialClaimValue;
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  }
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  zero_marked_bytes();
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   373
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  _offsets.resize(HeapRegion::GrainWords);
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  init_top_at_mark_start();
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  if (clear_space) clear(SpaceDecorator::Mangle);
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   377
}
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   378
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   379
void HeapRegion::par_clear() {
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   380
  assert(used() == 0, "the region should have been already cleared");
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   381
  assert(capacity() == HeapRegion::GrainBytes, "should be back to normal");
9418
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   382
  HeapRegionRemSet* hrrs = rem_set();
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   383
  hrrs->clear();
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   384
  CardTableModRefBS* ct_bs =
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   385
                   (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set();
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   386
  ct_bs->clear(MemRegion(bottom(), end()));
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   387
}
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   388
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   389
void HeapRegion::calc_gc_efficiency() {
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   390
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
11756
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   391
  G1CollectorPolicy* g1p = g1h->g1_policy();
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   392
  _gc_efficiency = (double) reclaimable_bytes() /
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   393
                            g1p->predict_region_elapsed_time_ms(this, false);
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   394
}
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   395
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   396
void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) {
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   397
  assert(!isHumongous(), "sanity / pre-condition");
6983
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   398
  assert(end() == _orig_end,
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   399
         "Should be normal before the humongous object allocation");
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   400
  assert(top() == bottom(), "should be empty");
7904
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   401
  assert(bottom() <= new_top && new_top <= new_end, "pre-condition");
6983
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diff changeset
   402
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580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
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   403
  _humongous_type = StartsHumongous;
1374
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   404
  _humongous_start_region = this;
6983
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diff changeset
   405
a8c50cedbce9 6991377: G1: race between concurrent refinement and humongous object allocation
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   406
  set_end(new_end);
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
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diff changeset
   407
  _offsets.set_for_starts_humongous(new_top);
6983
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diff changeset
   408
}
a8c50cedbce9 6991377: G1: race between concurrent refinement and humongous object allocation
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diff changeset
   409
7904
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diff changeset
   410
void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) {
7923
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diff changeset
   411
  assert(!isHumongous(), "sanity / pre-condition");
6983
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diff changeset
   412
  assert(end() == _orig_end,
a8c50cedbce9 6991377: G1: race between concurrent refinement and humongous object allocation
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diff changeset
   413
         "Should be normal before the humongous object allocation");
a8c50cedbce9 6991377: G1: race between concurrent refinement and humongous object allocation
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diff changeset
   414
  assert(top() == bottom(), "should be empty");
7904
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diff changeset
   415
  assert(first_hr->startsHumongous(), "pre-condition");
6983
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diff changeset
   416
a8c50cedbce9 6991377: G1: race between concurrent refinement and humongous object allocation
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diff changeset
   417
  _humongous_type = ContinuesHumongous;
7904
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diff changeset
   418
  _humongous_start_region = first_hr;
1374
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   419
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
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   420
7923
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   421
void HeapRegion::set_notHumongous() {
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diff changeset
   422
  assert(isHumongous(), "pre-condition");
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diff changeset
   423
fc200fcd4e05 6977804: G1: remove the zero-filling thread
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diff changeset
   424
  if (startsHumongous()) {
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diff changeset
   425
    assert(top() <= end(), "pre-condition");
fc200fcd4e05 6977804: G1: remove the zero-filling thread
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diff changeset
   426
    set_end(_orig_end);
fc200fcd4e05 6977804: G1: remove the zero-filling thread
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diff changeset
   427
    if (top() > end()) {
fc200fcd4e05 6977804: G1: remove the zero-filling thread
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diff changeset
   428
      // at least one "continues humongous" region after it
fc200fcd4e05 6977804: G1: remove the zero-filling thread
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diff changeset
   429
      set_top(end());
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   430
    }
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   431
  } else {
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   432
    // continues humongous
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   433
    assert(end() == _orig_end, "sanity");
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   434
  }
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   435
10677
370a8da2d63f 7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents: 10674
diff changeset
   436
  assert(capacity() == HeapRegion::GrainBytes, "pre-condition");
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   437
  _humongous_type = NotHumongous;
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   438
  _humongous_start_region = NULL;
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   439
}
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   440
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   441
bool HeapRegion::claimHeapRegion(jint claimValue) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   442
  jint current = _claimed;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   443
  if (current != claimValue) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   444
    jint res = Atomic::cmpxchg(claimValue, &_claimed, current);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   445
    if (res == current) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   446
      return true;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   447
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   448
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   449
  return false;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   450
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   451
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   452
HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   453
  HeapWord* low = addr;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   454
  HeapWord* high = end();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   455
  while (low < high) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   456
    size_t diff = pointer_delta(high, low);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   457
    // Must add one below to bias toward the high amount.  Otherwise, if
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   458
  // "high" were at the desired value, and "low" were one less, we
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   459
    // would not converge on "high".  This is not symmetric, because
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   460
    // we set "high" to a block start, which might be the right one,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   461
    // which we don't do for "low".
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   462
    HeapWord* middle = low + (diff+1)/2;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   463
    if (middle == high) return high;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   464
    HeapWord* mid_bs = block_start_careful(middle);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   465
    if (mid_bs < addr) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   466
      low = middle;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   467
    } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   468
      high = mid_bs;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   469
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   470
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   471
  assert(low == high && low >= addr, "Didn't work.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   472
  return low;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   473
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   474
1388
tonyp
parents: 1387
diff changeset
   475
void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) {
tonyp
parents: 1387
diff changeset
   476
  G1OffsetTableContigSpace::initialize(mr, false, mangle_space);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   477
  hr_clear(false/*par*/, clear_space);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   478
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   479
#ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   480
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   481
#endif // _MSC_VER
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   482
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   483
12381
1438e0fbfa27 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 12379
diff changeset
   484
HeapRegion::HeapRegion(uint hrs_index,
1438e0fbfa27 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 12379
diff changeset
   485
                       G1BlockOffsetSharedArray* sharedOffsetArray,
1438e0fbfa27 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 12379
diff changeset
   486
                       MemRegion mr, bool is_zeroed) :
1438e0fbfa27 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 12379
diff changeset
   487
    G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed),
10670
4ea0e7d2ffbc 6484982: G1: process references during evacuation pauses
johnc
parents: 10669
diff changeset
   488
    _hrs_index(hrs_index),
1387
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1385
diff changeset
   489
    _humongous_type(NotHumongous), _humongous_start_region(NULL),
10243
d00a21009f1f 7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents: 9995
diff changeset
   490
    _in_collection_set(false),
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   491
    _next_in_special_set(NULL), _orig_end(NULL),
1387
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1385
diff changeset
   492
    _claimed(InitialClaimValue), _evacuation_failed(false),
12382
6aaecb1cbfe1 7145441: G1: collection set chooser-related cleanup
tonyp
parents: 12381
diff changeset
   493
    _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0),
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   494
    _young_type(NotYoung), _next_young_region(NULL),
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   495
    _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false),
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   496
#ifdef ASSERT
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   497
    _containing_set(NULL),
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   498
#endif // ASSERT
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   499
     _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1),
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7904
diff changeset
   500
    _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0),
5350
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   501
    _predicted_bytes_to_copy(0)
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   502
{
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   503
  _orig_end = mr.end();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   504
  // Note that initialize() will set the start of the unmarked area of the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   505
  // region.
1388
tonyp
parents: 1387
diff changeset
   506
  this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle);
tonyp
parents: 1387
diff changeset
   507
  set_top(bottom());
tonyp
parents: 1387
diff changeset
   508
  set_saved_mark();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   509
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   510
  _rem_set =  new HeapRegionRemSet(sharedOffsetArray, this);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   511
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   512
  assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   513
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   514
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   515
class NextCompactionHeapRegionClosure: public HeapRegionClosure {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   516
  const HeapRegion* _target;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   517
  bool _target_seen;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   518
  HeapRegion* _last;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   519
  CompactibleSpace* _res;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   520
public:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   521
  NextCompactionHeapRegionClosure(const HeapRegion* target) :
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   522
    _target(target), _target_seen(false), _res(NULL) {}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   523
  bool doHeapRegion(HeapRegion* cur) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   524
    if (_target_seen) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   525
      if (!cur->isHumongous()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   526
        _res = cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   527
        return true;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   528
      }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   529
    } else if (cur == _target) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   530
      _target_seen = true;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   531
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   532
    return false;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   533
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   534
  CompactibleSpace* result() { return _res; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   535
};
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   536
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   537
CompactibleSpace* HeapRegion::next_compaction_space() const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   538
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   539
  // cast away const-ness
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   540
  HeapRegion* r = (HeapRegion*) this;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   541
  NextCompactionHeapRegionClosure blk(r);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   542
  g1h->heap_region_iterate_from(r, &blk);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   543
  return blk.result();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   544
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   545
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   546
void HeapRegion::save_marks() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   547
  set_saved_mark();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   548
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   549
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   550
void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   551
  HeapWord* p = mr.start();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   552
  HeapWord* e = mr.end();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   553
  oop obj;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   554
  while (p < e) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   555
    obj = oop(p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   556
    p += obj->oop_iterate(cl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   557
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   558
  assert(p == e, "bad memregion: doesn't end on obj boundary");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   559
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   560
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   561
#define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   562
void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   563
  ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl);              \
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   564
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   565
SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   566
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   567
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   568
void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   569
  oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   570
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   571
11455
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   572
void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark,
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   573
                                                    bool during_conc_mark) {
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   574
  // We always recreate the prev marking info and we'll explicitly
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   575
  // mark all objects we find to be self-forwarded on the prev
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   576
  // bitmap. So all objects need to be below PTAMS.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   577
  _prev_top_at_mark_start = top();
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   578
  _prev_marked_bytes = 0;
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   579
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   580
  if (during_initial_mark) {
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   581
    // During initial-mark, we'll also explicitly mark all objects
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   582
    // we find to be self-forwarded on the next bitmap. So all
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   583
    // objects need to be below NTAMS.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   584
    _next_top_at_mark_start = top();
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   585
    _next_marked_bytes = 0;
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   586
  } else if (during_conc_mark) {
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   587
    // During concurrent mark, all objects in the CSet (including
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   588
    // the ones we find to be self-forwarded) are implicitly live.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   589
    // So all objects need to be above NTAMS.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   590
    _next_top_at_mark_start = bottom();
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   591
    _next_marked_bytes = 0;
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   592
  }
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   593
}
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   594
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   595
void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark,
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   596
                                                  bool during_conc_mark,
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   597
                                                  size_t marked_bytes) {
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   598
  assert(0 <= marked_bytes && marked_bytes <= used(),
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   599
         err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT,
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   600
                 marked_bytes, used()));
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   601
  _prev_marked_bytes = marked_bytes;
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   602
}
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11393
diff changeset
   603
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   604
HeapWord*
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   605
HeapRegion::object_iterate_mem_careful(MemRegion mr,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   606
                                                 ObjectClosure* cl) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   607
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   608
  // We used to use "block_start_careful" here.  But we're actually happy
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   609
  // to update the BOT while we do this...
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   610
  HeapWord* cur = block_start(mr.start());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   611
  mr = mr.intersection(used_region());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   612
  if (mr.is_empty()) return NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   613
  // Otherwise, find the obj that extends onto mr.start().
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   614
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   615
  assert(cur <= mr.start()
3262
30d1c247fc25 6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents: 3191
diff changeset
   616
         && (oop(cur)->klass_or_null() == NULL ||
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   617
             cur + oop(cur)->size() > mr.start()),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   618
         "postcondition of block_start");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   619
  oop obj;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   620
  while (cur < mr.end()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   621
    obj = oop(cur);
3262
30d1c247fc25 6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents: 3191
diff changeset
   622
    if (obj->klass_or_null() == NULL) {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   623
      // Ran into an unparseable point.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   624
      return cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   625
    } else if (!g1h->is_obj_dead(obj)) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   626
      cl->do_object(obj);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   627
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   628
    if (cl->abort()) return cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   629
    // The check above must occur before the operation below, since an
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   630
    // abort might invalidate the "size" operation.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   631
    cur += obj->size();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   632
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   633
  return NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   634
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   635
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   636
HeapWord*
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   637
HeapRegion::
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   638
oops_on_card_seq_iterate_careful(MemRegion mr,
6068
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   639
                                 FilterOutOfRegionClosure* cl,
9418
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   640
                                 bool filter_young,
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   641
                                 jbyte* card_ptr) {
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   642
  // Currently, we should only have to clean the card if filter_young
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   643
  // is true and vice versa.
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   644
  if (filter_young) {
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   645
    assert(card_ptr != NULL, "pre-condition");
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   646
  } else {
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   647
    assert(card_ptr == NULL, "pre-condition");
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   648
  }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   649
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   650
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   651
  // If we're within a stop-world GC, then we might look at a card in a
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   652
  // GC alloc region that extends onto a GC LAB, which may not be
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   653
  // parseable.  Stop such at the "saved_mark" of the region.
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   654
  if (g1h->is_gc_active()) {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   655
    mr = mr.intersection(used_region_at_save_marks());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   656
  } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   657
    mr = mr.intersection(used_region());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   658
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   659
  if (mr.is_empty()) return NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   660
  // Otherwise, find the obj that extends onto mr.start().
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   661
6068
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   662
  // The intersection of the incoming mr (for the card) and the
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   663
  // allocated part of the region is non-empty. This implies that
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   664
  // we have actually allocated into this region. The code in
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   665
  // G1CollectedHeap.cpp that allocates a new region sets the
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   666
  // is_young tag on the region before allocating. Thus we
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   667
  // safely know if this region is young.
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   668
  if (is_young() && filter_young) {
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   669
    return NULL;
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   670
  }
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   671
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   672
  assert(!is_young(), "check value of filter_young");
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   673
9418
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   674
  // We can only clean the card here, after we make the decision that
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   675
  // the card is not young. And we only clean the card if we have been
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   676
  // asked to (i.e., card_ptr != NULL).
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   677
  if (card_ptr != NULL) {
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   678
    *card_ptr = CardTableModRefBS::clean_card_val();
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   679
    // We must complete this write before we do any of the reads below.
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   680
    OrderAccess::storeload();
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   681
  }
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8928
diff changeset
   682
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   683
  // Cache the boundaries of the memory region in some const locals
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   684
  HeapWord* const start = mr.start();
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   685
  HeapWord* const end = mr.end();
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   686
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   687
  // We used to use "block_start_careful" here.  But we're actually happy
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   688
  // to update the BOT while we do this...
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   689
  HeapWord* cur = block_start(start);
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   690
  assert(cur <= start, "Postcondition");
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   691
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   692
  oop obj;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   693
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   694
  HeapWord* next = cur;
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   695
  while (next <= start) {
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   696
    cur = next;
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   697
    obj = oop(cur);
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   698
    if (obj->klass_or_null() == NULL) {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   699
      // Ran into an unparseable point.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   700
      return cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   701
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   702
    // Otherwise...
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   703
    next = (cur + obj->size());
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   704
  }
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   705
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   706
  // If we finish the above loop...We have a parseable object that
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   707
  // begins on or before the start of the memory region, and ends
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   708
  // inside or spans the entire region.
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   709
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   710
  assert(obj == oop(cur), "sanity");
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   711
  assert(cur <= start &&
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   712
         obj->klass_or_null() != NULL &&
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   713
         (cur + obj->size()) > start,
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   714
         "Loop postcondition");
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   715
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   716
  if (!g1h->is_obj_dead(obj)) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   717
    obj->oop_iterate(cl, mr);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   718
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   719
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   720
  while (cur < end) {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   721
    obj = oop(cur);
3262
30d1c247fc25 6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents: 3191
diff changeset
   722
    if (obj->klass_or_null() == NULL) {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   723
      // Ran into an unparseable point.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   724
      return cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   725
    };
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   726
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   727
    // Otherwise:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   728
    next = (cur + obj->size());
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   729
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   730
    if (!g1h->is_obj_dead(obj)) {
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   731
      if (next < end || !obj->is_objArray()) {
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   732
        // This object either does not span the MemRegion
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   733
        // boundary, or if it does it's not an array.
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   734
        // Apply closure to whole object.
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   735
        obj->oop_iterate(cl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   736
      } else {
11586
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   737
        // This obj is an array that spans the boundary.
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   738
        // Stop at the boundary.
ccc217c177ee 7133038: G1: Some small profile based optimizations
johnc
parents: 11455
diff changeset
   739
        obj->oop_iterate(cl, mr);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   740
      }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   741
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   742
    cur = next;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   743
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   744
  return NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   745
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   746
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   747
void HeapRegion::print() const { print_on(gclog_or_tty); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   748
void HeapRegion::print_on(outputStream* st) const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   749
  if (isHumongous()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   750
    if (startsHumongous())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   751
      st->print(" HS");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   752
    else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   753
      st->print(" HC");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   754
  } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   755
    st->print("   ");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   756
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   757
  if (in_collection_set())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   758
    st->print(" CS");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   759
  else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   760
    st->print("   ");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   761
  if (is_young())
5350
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 5344
diff changeset
   762
    st->print(is_survivor() ? " SU" : " Y ");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   763
  else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   764
    st->print("   ");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   765
  if (is_empty())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   766
    st->print(" F");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   767
  else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   768
    st->print("  ");
10997
0be4b3be7197 7099849: G1: include heap region information in hs_err files
tonyp
parents: 10770
diff changeset
   769
  st->print(" TS %5d", _gc_time_stamp);
5344
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 4023
diff changeset
   770
  st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT,
f78ef2531f44 6937142: G1: improvements to debugging output (S-M)
tonyp
parents: 4023
diff changeset
   771
            prev_top_at_mark_start(), next_top_at_mark_start());
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   772
  G1OffsetTableContigSpace::print_on(st);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   773
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   774
12379
2cf45b79ce3a 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 11756
diff changeset
   775
void HeapRegion::verify() const {
4023
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   776
  bool dummy = false;
12379
2cf45b79ce3a 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 11756
diff changeset
   777
  verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy);
3000
bbce6052b595 6850846: G1: extend G1 marking verification
tonyp
parents: 2883
diff changeset
   778
}
bbce6052b595 6850846: G1: extend G1 marking verification
tonyp
parents: 2883
diff changeset
   779
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   780
// This really ought to be commoned up into OffsetTableContigSpace somehow.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   781
// We would need a mechanism to make that code skip dead objects.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   782
12379
2cf45b79ce3a 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 11756
diff changeset
   783
void HeapRegion::verify(VerifyOption vo,
4023
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   784
                        bool* failures) const {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   785
  G1CollectedHeap* g1 = G1CollectedHeap::heap();
4023
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   786
  *failures = false;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   787
  HeapWord* p = bottom();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   788
  HeapWord* prev_p = NULL;
9995
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   789
  VerifyLiveClosure vl_cl(g1, vo);
6260
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   790
  bool is_humongous = isHumongous();
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   791
  bool do_bot_verify = !is_young();
6260
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   792
  size_t object_num = 0;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   793
  while (p < top()) {
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   794
    oop obj = oop(p);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   795
    size_t obj_size = obj->size();
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   796
    object_num += 1;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   797
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   798
    if (is_humongous != g1->isHumongous(obj_size)) {
6260
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   799
      gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size ("
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   800
                             SIZE_FORMAT" words) in a %shumongous region",
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   801
                             p, g1->isHumongous(obj_size) ? "" : "non-",
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   802
                             obj_size, is_humongous ? "" : "non-");
6260
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   803
       *failures = true;
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   804
       return;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   805
    }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   806
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   807
    // If it returns false, verify_for_object() will output the
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   808
    // appropriate messasge.
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   809
    if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   810
      *failures = true;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   811
      return;
6260
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   812
    }
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   813
9995
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   814
    if (!g1->is_obj_dead_cond(obj, this, vo)) {
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   815
      if (obj->is_oop()) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   816
        klassOop klass = obj->klass();
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   817
        if (!klass->is_perm()) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   818
          gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" "
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   819
                                 "not in perm", klass, obj);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   820
          *failures = true;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   821
          return;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   822
        } else if (!klass->is_klass()) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   823
          gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" "
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   824
                                 "not a klass", klass, obj);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   825
          *failures = true;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   826
          return;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   827
        } else {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   828
          vl_cl.set_containing_obj(obj);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   829
          obj->oop_iterate(&vl_cl);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   830
          if (vl_cl.failures()) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   831
            *failures = true;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   832
          }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   833
          if (G1MaxVerifyFailures >= 0 &&
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   834
              vl_cl.n_failures() >= G1MaxVerifyFailures) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   835
            return;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   836
          }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   837
        }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   838
      } else {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   839
        gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj);
4023
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   840
        *failures = true;
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   841
        return;
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   842
      }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   843
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   844
    prev_p = p;
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   845
    p += obj_size;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   846
  }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   847
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   848
  if (p != top()) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   849
    gclog_or_tty->print_cr("end of last object "PTR_FORMAT" "
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   850
                           "does not match top "PTR_FORMAT, p, top());
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   851
    *failures = true;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   852
    return;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   853
  }
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   854
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   855
  HeapWord* the_end = end();
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   856
  assert(p == top(), "it should still hold");
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   857
  // Do some extra BOT consistency checking for addresses in the
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   858
  // range [top, end). BOT look-ups in this range should yield
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   859
  // top. No point in doing that if top == end (there's nothing there).
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   860
  if (p < the_end) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   861
    // Look up top
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   862
    HeapWord* addr_1 = p;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   863
    HeapWord* b_start_1 = _offsets.block_start_const(addr_1);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   864
    if (b_start_1 != p) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   865
      gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" "
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   866
                             " yielded "PTR_FORMAT", expecting "PTR_FORMAT,
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   867
                             addr_1, b_start_1, p);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   868
      *failures = true;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   869
      return;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   870
    }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   871
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   872
    // Look up top + 1
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   873
    HeapWord* addr_2 = p + 1;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   874
    if (addr_2 < the_end) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   875
      HeapWord* b_start_2 = _offsets.block_start_const(addr_2);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   876
      if (b_start_2 != p) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   877
        gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" "
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   878
                               " yielded "PTR_FORMAT", expecting "PTR_FORMAT,
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   879
                               addr_2, b_start_2, p);
4023
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   880
        *failures = true;
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   881
        return;
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   882
      }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   883
    }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   884
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   885
    // Look up an address between top and end
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   886
    size_t diff = pointer_delta(the_end, p) / 2;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   887
    HeapWord* addr_3 = p + diff;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   888
    if (addr_3 < the_end) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   889
      HeapWord* b_start_3 = _offsets.block_start_const(addr_3);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   890
      if (b_start_3 != p) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   891
        gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" "
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   892
                               " yielded "PTR_FORMAT", expecting "PTR_FORMAT,
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   893
                               addr_3, b_start_3, p);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   894
        *failures = true;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   895
        return;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   896
      }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   897
    }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   898
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   899
    // Loook up end - 1
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   900
    HeapWord* addr_4 = the_end - 1;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   901
    HeapWord* b_start_4 = _offsets.block_start_const(addr_4);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   902
    if (b_start_4 != p) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   903
      gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" "
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   904
                             " yielded "PTR_FORMAT", expecting "PTR_FORMAT,
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   905
                             addr_4, b_start_4, p);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   906
      *failures = true;
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   907
      return;
4023
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   908
    }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   909
  }
4023
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   910
6260
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   911
  if (is_humongous && object_num > 1) {
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   912
    gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous "
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   913
                           "but has "SIZE_FORMAT", objects",
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   914
                           bottom(), end(), object_num);
fba83fd3adc7 6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents: 6247
diff changeset
   915
    *failures = true;
4023
6c3401503290 6882730: G1: parallel heap verification messes up region dump
tonyp
parents: 3697
diff changeset
   916
    return;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   917
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   918
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   919
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   920
// G1OffsetTableContigSpace code; copied from space.cpp.  Hope this can go
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   921
// away eventually.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   922
1388
tonyp
parents: 1387
diff changeset
   923
void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   924
  // false ==> we'll do the clearing if there's clearing to be done.
1388
tonyp
parents: 1387
diff changeset
   925
  ContiguousSpace::initialize(mr, false, mangle_space);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   926
  _offsets.zero_bottom_entry();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   927
  _offsets.initialize_threshold();
1388
tonyp
parents: 1387
diff changeset
   928
  if (clear_space) clear(mangle_space);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   929
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   930
1388
tonyp
parents: 1387
diff changeset
   931
void G1OffsetTableContigSpace::clear(bool mangle_space) {
tonyp
parents: 1387
diff changeset
   932
  ContiguousSpace::clear(mangle_space);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   933
  _offsets.zero_bottom_entry();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   934
  _offsets.initialize_threshold();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   935
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   936
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   937
void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   938
  Space::set_bottom(new_bottom);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   939
  _offsets.set_bottom(new_bottom);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   940
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   941
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   942
void G1OffsetTableContigSpace::set_end(HeapWord* new_end) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   943
  Space::set_end(new_end);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   944
  _offsets.resize(new_end - bottom());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   945
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   946
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   947
void G1OffsetTableContigSpace::print() const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   948
  print_short();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   949
  gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", "
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   950
                INTPTR_FORMAT ", " INTPTR_FORMAT ")",
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   951
                bottom(), top(), _offsets.threshold(), end());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   952
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   953
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   954
HeapWord* G1OffsetTableContigSpace::initialize_threshold() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   955
  return _offsets.initialize_threshold();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   956
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   957
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   958
HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   959
                                                    HeapWord* end) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   960
  _offsets.alloc_block(start, end);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   961
  return _offsets.threshold();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   962
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   963
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   964
HeapWord* G1OffsetTableContigSpace::saved_mark_word() const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   965
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   966
  assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   967
  if (_gc_time_stamp < g1h->get_gc_time_stamp())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   968
    return top();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   969
  else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   970
    return ContiguousSpace::saved_mark_word();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   971
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   972
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   973
void G1OffsetTableContigSpace::set_saved_mark() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   974
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   975
  unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   976
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   977
  if (_gc_time_stamp < curr_gc_time_stamp) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   978
    // The order of these is important, as another thread might be
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   979
    // about to start scanning this region. If it does so after
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   980
    // set_saved_mark and before _gc_time_stamp = ..., then the latter
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   981
    // will be false, and it will pick up top() as the high water mark
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   982
    // of region. If it does so after _gc_time_stamp = ..., then it
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   983
    // will pick up the right saved_mark_word() as the high water mark
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   984
    // of the region. Either way, the behaviour will be correct.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   985
    ContiguousSpace::set_saved_mark();
3262
30d1c247fc25 6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents: 3191
diff changeset
   986
    OrderAccess::storestore();
1385
1751733b089b 6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents: 1374
diff changeset
   987
    _gc_time_stamp = curr_gc_time_stamp;
8928
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 7923
diff changeset
   988
    // No need to do another barrier to flush the writes above. If
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 7923
diff changeset
   989
    // this is called in parallel with other threads trying to
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 7923
diff changeset
   990
    // allocate into the region, the caller should call this while
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 7923
diff changeset
   991
    // holding a lock and when the lock is released the writes will be
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 7923
diff changeset
   992
    // flushed.
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   993
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   994
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   995
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   996
G1OffsetTableContigSpace::
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   997
G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   998
                         MemRegion mr, bool is_zeroed) :
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   999
  _offsets(sharedOffsetArray, mr),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1000
  _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1001
  _gc_time_stamp(0)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1002
{
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1003
  _offsets.set_space(this);
1388
tonyp
parents: 1387
diff changeset
  1004
  initialize(mr, !is_zeroed, SpaceDecorator::Mangle);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
  1005
}