hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp
author brutisso
Wed, 27 Aug 2014 10:51:08 +0200
changeset 26322 3e4ef23b8ee3
parent 26316 93f6b40c038b
child 26327 af7eab49716d
permissions -rw-r--r--
8055816: Remove dead code in g1BlockOffsetTable Reviewed-by: tschatzl, mgerdin
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
     1
/*
24424
2658d7834c6e 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 23471
diff changeset
     2
 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
     3
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
     4
 *
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
     5
 * This code is free software; you can redistribute it and/or modify it
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
     6
 * under the terms of the GNU General Public License version 2 only, as
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
     7
 * published by the Free Software Foundation.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
     8
 *
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
     9
 * This code is distributed in the hope that it will be useful, but WITHOUT
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    10
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    11
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    12
 * version 2 for more details (a copy is included in the LICENSE file that
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    13
 * accompanied this code).
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    14
 *
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    15
 * You should have received a copy of the GNU General Public License version
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    16
 * 2 along with this work; if not, write to the Free Software Foundation,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    17
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    18
 *
5547
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 5350
diff changeset
    19
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 5350
diff changeset
    20
 * or visit www.oracle.com if you need additional information or have any
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 5350
diff changeset
    21
 * questions.
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    22
 *
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    23
 */
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    24
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    25
#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    26
#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    27
25361
5146d1e12a2f 8047820: G1 Block offset table does not need to support generic Space classes
mgerdin
parents: 25360
diff changeset
    28
#include "gc_implementation/g1/g1BlockOffsetTable.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    29
#include "gc_implementation/g1/g1_specialized_oop_closures.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    30
#include "gc_implementation/g1/survRateGroup.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    31
#include "gc_implementation/shared/ageTable.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    32
#include "gc_implementation/shared/spaceDecorator.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    33
#include "memory/space.inline.hpp"
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    34
#include "memory/watermark.hpp"
15482
470d0b0c09f1 8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents: 13756
diff changeset
    35
#include "utilities/macros.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
    36
15482
470d0b0c09f1 8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents: 13756
diff changeset
    37
#if INCLUDE_ALL_GCS
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    38
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    39
// A HeapRegion is the smallest piece of a G1CollectedHeap that
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    40
// can be collected independently.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    41
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    42
// NOTE: Although a HeapRegion is a Space, its
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    43
// Space::initDirtyCardClosure method must not be called.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    44
// The problem is that the existence of this method breaks
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    45
// the independence of barrier sets from remembered sets.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    46
// The solution is to remove this method from the definition
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    47
// of a Space.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    48
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    49
class HeapRegionRemSet;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    50
class HeapRegionRemSetIterator;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    51
class HeapRegion;
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
    52
class HeapRegionSetBase;
19339
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
    53
class nmethod;
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
    54
12381
1438e0fbfa27 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 12379
diff changeset
    55
#define HR_FORMAT "%u:(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]"
9989
305a76435cf1 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 9418
diff changeset
    56
#define HR_FORMAT_PARAMS(_hr_) \
26316
93f6b40c038b 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 26157
diff changeset
    57
                (_hr_)->hrm_index(), \
13336
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
    58
                (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : \
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
    59
                (_hr_)->startsHumongous() ? "HS" : \
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
    60
                (_hr_)->continuesHumongous() ? "HC" : \
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
    61
                !(_hr_)->is_empty() ? "O" : "F", \
24424
2658d7834c6e 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 23471
diff changeset
    62
                p2i((_hr_)->bottom()), p2i((_hr_)->top()), p2i((_hr_)->end())
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    63
26316
93f6b40c038b 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 26157
diff changeset
    64
// sentinel value for hrm_index
93f6b40c038b 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 26157
diff changeset
    65
#define G1_NO_HRM_INDEX ((uint) -1)
12381
1438e0fbfa27 7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents: 12379
diff changeset
    66
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    67
// A dirty card to oop closure for heap regions. It
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    68
// knows how to get the G1 heap and how to use the bitmap
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    69
// in the concurrent marker used by G1 to filter remembered
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    70
// sets.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    71
25360
5b6141bf7564 8047819: G1 HeapRegionDCTOC does not need to inherit ContiguousSpaceDCTOC
mgerdin
parents: 24424
diff changeset
    72
class HeapRegionDCTOC : public DirtyCardToOopClosure {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    73
public:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    74
  // Specification of possible DirtyCardToOopClosure filtering.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    75
  enum FilterKind {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    76
    NoFilterKind,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    77
    IntoCSFilterKind,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    78
    OutOfRegionFilterKind
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    79
  };
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    80
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    81
protected:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    82
  HeapRegion* _hr;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    83
  FilterKind _fk;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    84
  G1CollectedHeap* _g1;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    85
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    86
  // Walk the given memory region from bottom to (actual) top
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    87
  // looking for objects and applying the oop closure (_cl) to
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    88
  // them. The base implementation of this treats the area as
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    89
  // blocks, where a block may or may not be an object. Sub-
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    90
  // classes should override this to provide more accurate
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    91
  // or possibly more efficient walking.
25360
5b6141bf7564 8047819: G1 HeapRegionDCTOC does not need to inherit ContiguousSpaceDCTOC
mgerdin
parents: 24424
diff changeset
    92
  void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    93
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    94
public:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    95
  HeapRegionDCTOC(G1CollectedHeap* g1,
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13336
diff changeset
    96
                  HeapRegion* hr, ExtendedOopClosure* cl,
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    97
                  CardTableModRefBS::PrecisionStyle precision,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    98
                  FilterKind fk);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
    99
};
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   100
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   101
// The complicating factor is that BlockOffsetTable diverged
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   102
// significantly, and we need functionality that is only in the G1 version.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   103
// So I copied that code, which led to an alternate G1 version of
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   104
// OffsetTableContigSpace.  If the two versions of BlockOffsetTable could
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   105
// be reconciled, then G1OffsetTableContigSpace could go away.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   106
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   107
// The idea behind time stamps is the following. Doing a save_marks on
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   108
// all regions at every GC pause is time consuming (if I remember
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   109
// well, 10ms or so). So, we would like to do that only for regions
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   110
// that are GC alloc regions. To achieve this, we use time
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   111
// stamps. For every evacuation pause, G1CollectedHeap generates a
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   112
// unique time stamp (essentially a counter that gets
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   113
// incremented). Every time we want to call save_marks on a region,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   114
// we set the saved_mark_word to top and also copy the current GC
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   115
// time stamp to the time stamp field of the space. Reading the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   116
// saved_mark_word involves checking the time stamp of the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   117
// region. If it is the same as the current GC time stamp, then we
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   118
// can safely read the saved_mark_word field, as it is valid. If the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   119
// time stamp of the region is not the same as the current GC time
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   120
// stamp, then we instead read top, as the saved_mark_word field is
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   121
// invalid. Time stamps (on the regions and also on the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   122
// G1CollectedHeap) are reset at every cleanup (we iterate over
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   123
// the regions anyway) and at the end of a Full GC. The current scheme
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   124
// that uses sequential unsigned ints will fail only if we have 4b
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   125
// evacuation pauses between two cleanups, which is _highly_ unlikely.
25481
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   126
class G1OffsetTableContigSpace: public CompactibleSpace {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   127
  friend class VMStructs;
25481
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   128
  HeapWord* _top;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   129
 protected:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   130
  G1BlockOffsetArrayContigSpace _offsets;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   131
  Mutex _par_alloc_lock;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   132
  volatile unsigned _gc_time_stamp;
8928
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   133
  // When we need to retire an allocation region, while other threads
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   134
  // are also concurrently trying to allocate into it, we typically
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   135
  // allocate a dummy object at the end of the region to ensure that
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   136
  // no more allocations can take place in it. However, sometimes we
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   137
  // want to know where the end of the last "real" object we allocated
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   138
  // into the region was and this is what this keeps track.
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   139
  HeapWord* _pre_dummy_top;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   140
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   141
 public:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   142
  G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray,
13756
3b72f3da8cd4 7016955: G1: remove the is_zeroed parameter from the HeapRegion constructor
johnc
parents: 13728
diff changeset
   143
                           MemRegion mr);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   144
25481
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   145
  void set_top(HeapWord* value) { _top = value; }
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   146
  HeapWord* top() const { return _top; }
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   147
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   148
 protected:
26157
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   149
  // Reset the G1OffsetTableContigSpace.
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   150
  virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space);
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   151
25481
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   152
  HeapWord** top_addr() { return &_top; }
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   153
  // Allocation helpers (return NULL if full).
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   154
  inline HeapWord* allocate_impl(size_t word_size, HeapWord* end_value);
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   155
  inline HeapWord* par_allocate_impl(size_t word_size, HeapWord* end_value);
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   156
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   157
 public:
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   158
  void reset_after_compaction() { set_top(compaction_top()); }
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   159
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   160
  size_t used() const { return byte_size(bottom(), top()); }
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   161
  size_t free() const { return byte_size(top(), end()); }
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   162
  bool is_free_block(const HeapWord* p) const { return p >= top(); }
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   163
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   164
  MemRegion used_region() const { return MemRegion(bottom(), top()); }
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   165
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   166
  void object_iterate(ObjectClosure* blk);
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   167
  void safe_object_iterate(ObjectClosure* blk);
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   168
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   169
  void set_bottom(HeapWord* value);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   170
  void set_end(HeapWord* value);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   171
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   172
  virtual HeapWord* saved_mark_word() const;
25479
0de5bbdaef7d 8047821: G1 Does not use the save_marks functionality as intended
mgerdin
parents: 25361
diff changeset
   173
  void record_top_and_timestamp();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   174
  void reset_gc_time_stamp() { _gc_time_stamp = 0; }
13336
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   175
  unsigned get_gc_time_stamp() { return _gc_time_stamp; }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   176
8928
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   177
  // See the comment above in the declaration of _pre_dummy_top for an
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   178
  // explanation of what it is.
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   179
  void set_pre_dummy_top(HeapWord* pre_dummy_top) {
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   180
    assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition");
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   181
    _pre_dummy_top = pre_dummy_top;
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   182
  }
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   183
  HeapWord* pre_dummy_top() {
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   184
    return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top;
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   185
  }
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   186
  void reset_pre_dummy_top() { _pre_dummy_top = NULL; }
e5c53268bef5 7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents: 8680
diff changeset
   187
1388
tonyp
parents: 1387
diff changeset
   188
  virtual void clear(bool mangle_space);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   189
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   190
  HeapWord* block_start(const void* p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   191
  HeapWord* block_start_const(const void* p) const;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   192
25481
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   193
  void prepare_for_compaction(CompactPoint* cp);
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   194
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   195
  // Add offset table update.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   196
  virtual HeapWord* allocate(size_t word_size);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   197
  HeapWord* par_allocate(size_t word_size);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   198
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   199
  // MarkSweep support phase3
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   200
  virtual HeapWord* initialize_threshold();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   201
  virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   202
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   203
  virtual void print() const;
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   204
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   205
  void reset_bot() {
26157
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   206
    _offsets.reset_bot();
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   207
  }
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   208
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   209
  void print_bot_on(outputStream* out) {
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   210
    _offsets.print_on(out);
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   211
  }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   212
};
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   213
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   214
class HeapRegion: public G1OffsetTableContigSpace {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   215
  friend class VMStructs;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   216
 private:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   217
1387
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   218
  enum HumongousType {
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   219
    NotHumongous = 0,
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   220
    StartsHumongous,
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   221
    ContinuesHumongous
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   222
  };
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   223
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   224
  // The remembered set for this region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   225
  // (Might want to make this "inline" later, to avoid some alloc failure
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   226
  // issues.)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   227
  HeapRegionRemSet* _rem_set;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   228
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   229
  G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   230
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   231
 protected:
9989
305a76435cf1 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 9418
diff changeset
   232
  // The index of this region in the heap region sequence.
26316
93f6b40c038b 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 26157
diff changeset
   233
  uint  _hrm_index;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   234
1387
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   235
  HumongousType _humongous_type;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   236
  // For a humongous region, region in which it starts.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   237
  HeapRegion* _humongous_start_region;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   238
  // For the start region of a humongous sequence, it's original end().
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   239
  HeapWord* _orig_end;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   240
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   241
  // True iff the region is in current collection_set.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   242
  bool _in_collection_set;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   243
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   244
  // True iff an attempt to evacuate an object in the region failed.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   245
  bool _evacuation_failed;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   246
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   247
  // A heap region may be a member one of a number of special subsets, each
25492
d27050bdfb04 8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents: 25491
diff changeset
   248
  // represented as linked lists through the field below.  Currently, there
d27050bdfb04 8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents: 25491
diff changeset
   249
  // is only one set:
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   250
  //   The collection set.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   251
  HeapRegion* _next_in_special_set;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   252
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   253
  // next region in the young "generation" region set
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   254
  HeapRegion* _next_young_region;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   255
2883
406d1e6d1aa1 6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents: 2344
diff changeset
   256
  // Next region whose cards need cleaning
406d1e6d1aa1 6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents: 2344
diff changeset
   257
  HeapRegion* _next_dirty_cards_region;
406d1e6d1aa1 6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents: 2344
diff changeset
   258
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   259
  // Fields used by the HeapRegionSetBase class and subclasses.
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   260
  HeapRegion* _next;
23471
ec9427262f0a 8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents: 23453
diff changeset
   261
  HeapRegion* _prev;
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   262
#ifdef ASSERT
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   263
  HeapRegionSetBase* _containing_set;
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   264
#endif // ASSERT
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   265
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   266
  // For parallel heapRegion traversal.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   267
  jint _claimed;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   268
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   269
  // We use concurrent marking to determine the amount of live data
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   270
  // in each heap region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   271
  size_t _prev_marked_bytes;    // Bytes known to be live via last completed marking.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   272
  size_t _next_marked_bytes;    // Bytes known to be live via in-progress marking.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   273
12382
6aaecb1cbfe1 7145441: G1: collection set chooser-related cleanup
tonyp
parents: 12381
diff changeset
   274
  // The calculated GC efficiency of the region.
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   275
  double _gc_efficiency;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   276
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   277
  enum YoungType {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   278
    NotYoung,                   // a region is not young
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   279
    Young,                      // a region is young
9989
305a76435cf1 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 9418
diff changeset
   280
    Survivor                    // a region is young and it contains survivors
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   281
  };
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   282
6068
80ef41e75a2d 6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents: 5547
diff changeset
   283
  volatile YoungType _young_type;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   284
  int  _young_index_in_cset;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   285
  SurvRateGroup* _surv_rate_group;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   286
  int  _age_index;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   287
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   288
  // The start of the unmarked area. The unmarked area extends from this
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   289
  // word until the top and/or end of the region, and is the part
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   290
  // of the region for which no marking was done, i.e. objects may
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   291
  // have been allocated in this part since the last mark phase.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   292
  // "prev" is the top at the start of the last completed marking.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   293
  // "next" is the top at the start of the in-progress marking (if any.)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   294
  HeapWord* _prev_top_at_mark_start;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   295
  HeapWord* _next_top_at_mark_start;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   296
  // If a collection pause is in progress, this is the top at the start
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   297
  // of that pause.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   298
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   299
  void init_top_at_mark_start() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   300
    assert(_prev_marked_bytes == 0 &&
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   301
           _next_marked_bytes == 0,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   302
           "Must be called after zero_marked_bytes.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   303
    HeapWord* bot = bottom();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   304
    _prev_top_at_mark_start = bot;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   305
    _next_top_at_mark_start = bot;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   306
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   307
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   308
  void set_young_type(YoungType new_type) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   309
    //assert(_young_type != new_type, "setting the same type" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   310
    // TODO: add more assertions here
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   311
    _young_type = new_type;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   312
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   313
5350
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   314
  // Cached attributes used in the collection set policy information
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   315
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   316
  // The RSet length that was added to the total value
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   317
  // for the collection set.
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   318
  size_t _recorded_rs_length;
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   319
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   320
  // The predicted elapsed time that was added to total value
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   321
  // for the collection set.
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   322
  double _predicted_elapsed_time_ms;
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   323
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   324
  // The predicted number of bytes to copy that was added to
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   325
  // the total value for the collection set.
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   326
  size_t _predicted_bytes_to_copy;
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   327
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   328
 public:
26316
93f6b40c038b 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 26157
diff changeset
   329
  HeapRegion(uint hrm_index,
9989
305a76435cf1 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 9418
diff changeset
   330
             G1BlockOffsetSharedArray* sharedOffsetArray,
13756
3b72f3da8cd4 7016955: G1: remove the is_zeroed parameter from the HeapRegion constructor
johnc
parents: 13728
diff changeset
   331
             MemRegion mr);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   332
26157
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   333
  // Initializing the HeapRegion not only resets the data structure, but also
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   334
  // resets the BOT for that heap region.
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   335
  // The default values for clear_space means that we will do the clearing if
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   336
  // there's clearing to be done ourselves. We also always mangle the space.
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   337
  virtual void initialize(MemRegion mr, bool clear_space = false, bool mangle_space = SpaceDecorator::Mangle);
70eddb655686 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents: 25492
diff changeset
   338
10677
370a8da2d63f 7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents: 10671
diff changeset
   339
  static int    LogOfHRGrainBytes;
370a8da2d63f 7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents: 10671
diff changeset
   340
  static int    LogOfHRGrainWords;
370a8da2d63f 7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents: 10671
diff changeset
   341
370a8da2d63f 7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents: 10671
diff changeset
   342
  static size_t GrainBytes;
370a8da2d63f 7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents: 10671
diff changeset
   343
  static size_t GrainWords;
370a8da2d63f 7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents: 10671
diff changeset
   344
  static size_t CardsPerRegion;
3697
ea9211aa02f5 6819085: G1: use larger and/or user settable region size
tonyp
parents: 3000
diff changeset
   345
10671
431ff8629f97 7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents: 10670
diff changeset
   346
  static size_t align_up_to_region_byte_size(size_t sz) {
431ff8629f97 7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents: 10670
diff changeset
   347
    return (sz + (size_t) GrainBytes - 1) &
431ff8629f97 7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents: 10670
diff changeset
   348
                                      ~((1 << (size_t) LogOfHRGrainBytes) - 1);
431ff8629f97 7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents: 10670
diff changeset
   349
  }
431ff8629f97 7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents: 10670
diff changeset
   350
19986
33d188c66ed9 8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents: 19728
diff changeset
   351
  static size_t max_region_size();
33d188c66ed9 8010722: assert: failed: heap size is too big for compressed oops
tschatzl
parents: 19728
diff changeset
   352
3697
ea9211aa02f5 6819085: G1: use larger and/or user settable region size
tonyp
parents: 3000
diff changeset
   353
  // It sets up the heap region size (GrainBytes / GrainWords), as
ea9211aa02f5 6819085: G1: use larger and/or user settable region size
tonyp
parents: 3000
diff changeset
   354
  // well as other related fields that are based on the heap region
ea9211aa02f5 6819085: G1: use larger and/or user settable region size
tonyp
parents: 3000
diff changeset
   355
  // size (LogOfHRGrainBytes / LogOfHRGrainWords /
ea9211aa02f5 6819085: G1: use larger and/or user settable region size
tonyp
parents: 3000
diff changeset
   356
  // CardsPerRegion). All those fields are considered constant
ea9211aa02f5 6819085: G1: use larger and/or user settable region size
tonyp
parents: 3000
diff changeset
   357
  // throughout the JVM's execution, therefore they should only be set
ea9211aa02f5 6819085: G1: use larger and/or user settable region size
tonyp
parents: 3000
diff changeset
   358
  // up once during initialization time.
19728
9e1556506d2d 8019902: G1: Use the average heap size rather than the minimum heap size to calculate the region size
brutisso
parents: 19339
diff changeset
   359
  static void setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   360
1387
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   361
  enum ClaimValues {
11176
9bb1ddd8da51 7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents: 11172
diff changeset
   362
    InitialClaimValue          = 0,
9bb1ddd8da51 7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents: 11172
diff changeset
   363
    FinalCountClaimValue       = 1,
9bb1ddd8da51 7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents: 11172
diff changeset
   364
    NoteEndClaimValue          = 2,
9bb1ddd8da51 7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents: 11172
diff changeset
   365
    ScrubRemSetClaimValue      = 3,
9bb1ddd8da51 7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents: 11172
diff changeset
   366
    ParVerifyClaimValue        = 4,
9bb1ddd8da51 7112743: G1: Reduce overhead of marking closure during evacuation pauses
johnc
parents: 11172
diff changeset
   367
    RebuildRSClaimValue        = 5,
12272
f87fd1292095 7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents: 11756
diff changeset
   368
    ParEvacFailureClaimValue   = 6,
f87fd1292095 7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents: 11756
diff changeset
   369
    AggregateCountClaimValue   = 7,
19339
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   370
    VerifyCountClaimValue      = 8,
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   371
    ParMarkRootClaimValue      = 9
1387
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   372
  };
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   373
25481
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   374
  // All allocated blocks are occupied by objects in a HeapRegion
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   375
  bool block_is_obj(const HeapWord* p) const;
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   376
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   377
  // Returns the object size for all valid block starts
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   378
  // and the amount of unallocated words if called on top()
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   379
  size_t block_size(const HeapWord* p) const;
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   380
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   381
  inline HeapWord* par_allocate_no_bot_updates(size_t word_size);
1427aa24638c 8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
parents: 25479
diff changeset
   382
  inline HeapWord* allocate_no_bot_updates(size_t word_size);
7905
cc7740616b03 6994297: G1: do first-level slow-path allocations with a CAS
tonyp
parents: 7904
diff changeset
   383
26316
93f6b40c038b 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 26157
diff changeset
   384
  // If this region is a member of a HeapRegionManager, the index in that
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   385
  // sequence, otherwise -1.
26316
93f6b40c038b 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 26157
diff changeset
   386
  uint hrm_index() const { return _hrm_index; }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   387
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   388
  // The number of bytes marked live in the region in the last marking phase.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   389
  size_t marked_bytes()    { return _prev_marked_bytes; }
8930
52368505ee8e 7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents: 8928
diff changeset
   390
  size_t live_bytes() {
52368505ee8e 7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents: 8928
diff changeset
   391
    return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes();
52368505ee8e 7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents: 8928
diff changeset
   392
  }
52368505ee8e 7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents: 8928
diff changeset
   393
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   394
  // The number of bytes counted in the next marking.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   395
  size_t next_marked_bytes() { return _next_marked_bytes; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   396
  // The number of bytes live wrt the next marking.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   397
  size_t next_live_bytes() {
8930
52368505ee8e 7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents: 8928
diff changeset
   398
    return
52368505ee8e 7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents: 8928
diff changeset
   399
      (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   400
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   401
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   402
  // A lower bound on the amount of garbage bytes in the region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   403
  size_t garbage_bytes() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   404
    size_t used_at_mark_start_bytes =
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   405
      (prev_top_at_mark_start() - bottom()) * HeapWordSize;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   406
    assert(used_at_mark_start_bytes >= marked_bytes(),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   407
           "Can't mark more than we have.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   408
    return used_at_mark_start_bytes - marked_bytes();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   409
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   410
11756
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   411
  // Return the amount of bytes we'll reclaim if we collect this
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   412
  // region. This includes not only the known garbage bytes in the
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   413
  // region but also any unallocated space in it, i.e., [top, end),
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   414
  // since it will also be reclaimed if we collect the region.
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   415
  size_t reclaimable_bytes() {
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   416
    size_t known_live_bytes = live_bytes();
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   417
    assert(known_live_bytes <= capacity(), "sanity");
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   418
    return capacity() - known_live_bytes;
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   419
  }
28b6fe22e43d 7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents: 11583
diff changeset
   420
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   421
  // An upper bound on the number of live bytes in the region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   422
  size_t max_live_bytes() { return used() - garbage_bytes(); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   423
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   424
  void add_to_marked_bytes(size_t incr_bytes) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   425
    _next_marked_bytes = _next_marked_bytes + incr_bytes;
11172
f720721985ba 7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents: 10770
diff changeset
   426
    assert(_next_marked_bytes <= used(), "invariant" );
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   427
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   428
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   429
  void zero_marked_bytes()      {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   430
    _prev_marked_bytes = _next_marked_bytes = 0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   431
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   432
1387
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   433
  bool isHumongous() const { return _humongous_type != NotHumongous; }
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   434
  bool startsHumongous() const { return _humongous_type == StartsHumongous; }
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
tonyp
parents: 1374
diff changeset
   435
  bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   436
  // For a humongous region, region in which it starts.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   437
  HeapRegion* humongous_start_region() const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   438
    return _humongous_start_region;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   439
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   440
13336
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   441
  // Return the number of distinct regions that are covered by this region:
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   442
  // 1 if the region is not humongous, >= 1 if the region is humongous.
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   443
  uint region_num() const {
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   444
    if (!isHumongous()) {
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   445
      return 1U;
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   446
    } else {
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   447
      assert(startsHumongous(), "doesn't make sense on HC regions");
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   448
      assert(capacity() % HeapRegion::GrainBytes == 0, "sanity");
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   449
      return (uint) (capacity() >> HeapRegion::LogOfHRGrainBytes);
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   450
    }
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   451
  }
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   452
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   453
  // Return the index + 1 of the last HC regions that's associated
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   454
  // with this HS region.
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   455
  uint last_hc_index() const {
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   456
    assert(startsHumongous(), "don't call this otherwise");
26316
93f6b40c038b 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 26157
diff changeset
   457
    return hrm_index() + region_num();
13336
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   458
  }
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   459
10767
4ce4a9b10523 7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
brutisso
parents: 10677
diff changeset
   460
  // Same as Space::is_in_reserved, but will use the original size of the region.
4ce4a9b10523 7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
brutisso
parents: 10677
diff changeset
   461
  // The original size is different only for start humongous regions. They get
4ce4a9b10523 7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
brutisso
parents: 10677
diff changeset
   462
  // their _end set up to be the end of the last continues region of the
4ce4a9b10523 7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
brutisso
parents: 10677
diff changeset
   463
  // corresponding humongous object.
4ce4a9b10523 7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
brutisso
parents: 10677
diff changeset
   464
  bool is_in_reserved_raw(const void* p) const {
4ce4a9b10523 7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
brutisso
parents: 10677
diff changeset
   465
    return _bottom <= p && p < _orig_end;
4ce4a9b10523 7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
brutisso
parents: 10677
diff changeset
   466
  }
4ce4a9b10523 7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
brutisso
parents: 10677
diff changeset
   467
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   468
  // Makes the current region be a "starts humongous" region, i.e.,
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   469
  // the first region in a series of one or more contiguous regions
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   470
  // that will contain a single "humongous" object. The two parameters
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   471
  // are as follows:
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   472
  //
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   473
  // new_top : The new value of the top field of this region which
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   474
  // points to the end of the humongous object that's being
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   475
  // allocated. If there is more than one region in the series, top
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   476
  // will lie beyond this region's original end field and on the last
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   477
  // region in the series.
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   478
  //
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   479
  // new_end : The new value of the end field of this region which
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   480
  // points to the end of the last region in the series. If there is
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   481
  // one region in the series (namely: this one) end will be the same
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   482
  // as the original end of this region.
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   483
  //
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   484
  // Updating top and end as described above makes this region look as
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   485
  // if it spans the entire space taken up by all the regions in the
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   486
  // series and an single allocation moved its top to new_top. This
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   487
  // ensures that the space (capacity / allocated) taken up by all
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   488
  // humongous regions can be calculated by just looking at the
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   489
  // "starts humongous" regions and by ignoring the "continues
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   490
  // humongous" regions.
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   491
  void set_startsHumongous(HeapWord* new_top, HeapWord* new_end);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   492
7904
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   493
  // Makes the current region be a "continues humongous'
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   494
  // region. first_hr is the "start humongous" region of the series
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   495
  // which this region will be part of.
e90e097fced4 7007068: G1: refine the BOT during evac failure handling
tonyp
parents: 7397
diff changeset
   496
  void set_continuesHumongous(HeapRegion* first_hr);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   497
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   498
  // Unsets the humongous-related fields on the region.
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   499
  void set_notHumongous();
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   500
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   501
  // If the region has a remembered set, return a pointer to it.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   502
  HeapRegionRemSet* rem_set() const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   503
    return _rem_set;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   504
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   505
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   506
  // True iff the region is in current collection_set.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   507
  bool in_collection_set() const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   508
    return _in_collection_set;
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
  void set_in_collection_set(bool b) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   511
    _in_collection_set = b;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   512
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   513
  HeapRegion* next_in_collection_set() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   514
    assert(in_collection_set(), "should only invoke on member of CS.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   515
    assert(_next_in_special_set == NULL ||
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   516
           _next_in_special_set->in_collection_set(),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   517
           "Malformed CS.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   518
    return _next_in_special_set;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   519
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   520
  void set_next_in_collection_set(HeapRegion* r) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   521
    assert(in_collection_set(), "should only invoke on member of CS.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   522
    assert(r == NULL || r->in_collection_set(), "Malformed CS.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   523
    _next_in_special_set = r;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   524
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   525
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   526
  // Methods used by the HeapRegionSetBase class and subclasses.
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   527
23471
ec9427262f0a 8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents: 23453
diff changeset
   528
  // Getter and setter for the next and prev fields used to link regions into
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   529
  // linked lists.
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   530
  HeapRegion* next()              { return _next; }
23471
ec9427262f0a 8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents: 23453
diff changeset
   531
  HeapRegion* prev()              { return _prev; }
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   532
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   533
  void set_next(HeapRegion* next) { _next = next; }
23471
ec9427262f0a 8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents: 23453
diff changeset
   534
  void set_prev(HeapRegion* prev) { _prev = prev; }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   535
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   536
  // Every region added to a set is tagged with a reference to that
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   537
  // set. This is used for doing consistency checking to make sure that
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   538
  // the contents of a set are as they should be and it's only
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   539
  // available in non-product builds.
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   540
#ifdef ASSERT
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   541
  void set_containing_set(HeapRegionSetBase* containing_set) {
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   542
    assert((containing_set == NULL && _containing_set != NULL) ||
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   543
           (containing_set != NULL && _containing_set == NULL),
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   544
           err_msg("containing_set: "PTR_FORMAT" "
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   545
                   "_containing_set: "PTR_FORMAT,
24424
2658d7834c6e 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 23471
diff changeset
   546
                   p2i(containing_set), p2i(_containing_set)));
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   547
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   548
    _containing_set = containing_set;
8680
f1c414e16a4c 7014923: G1: code cleanup
tonyp
parents: 7923
diff changeset
   549
  }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   550
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   551
  HeapRegionSetBase* containing_set() { return _containing_set; }
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   552
#else // ASSERT
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   553
  void set_containing_set(HeapRegionSetBase* containing_set) { }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   554
8680
f1c414e16a4c 7014923: G1: code cleanup
tonyp
parents: 7923
diff changeset
   555
  // containing_set() is only used in asserts so there's no reason
7923
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   556
  // to provide a dummy version of it.
fc200fcd4e05 6977804: G1: remove the zero-filling thread
tonyp
parents: 7905
diff changeset
   557
#endif // ASSERT
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   558
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   559
  HeapRegion* get_next_young_region() { return _next_young_region; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   560
  void set_next_young_region(HeapRegion* hr) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   561
    _next_young_region = hr;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   562
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   563
2883
406d1e6d1aa1 6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents: 2344
diff changeset
   564
  HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; }
406d1e6d1aa1 6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents: 2344
diff changeset
   565
  HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; }
406d1e6d1aa1 6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents: 2344
diff changeset
   566
  void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; }
406d1e6d1aa1 6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents: 2344
diff changeset
   567
  bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; }
406d1e6d1aa1 6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents: 2344
diff changeset
   568
9989
305a76435cf1 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 9418
diff changeset
   569
  HeapWord* orig_end() { return _orig_end; }
305a76435cf1 7045330: G1: Simplify/fix the HeapRegionSeq class
tonyp
parents: 9418
diff changeset
   570
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   571
  // Reset HR stuff to default values.
23453
09cfb0164acf 8027295: Free CSet takes ~50% of young pause time
tschatzl
parents: 19986
diff changeset
   572
  void hr_clear(bool par, bool clear_space, bool locked = false);
9418
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8930
diff changeset
   573
  void par_clear();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   574
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   575
  // Get the start of the unmarked area in this region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   576
  HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   577
  HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   578
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   579
  // Note the start or end of marking. This tells the heap region
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   580
  // that the collector is about to start or has finished (concurrently)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   581
  // marking the heap.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   582
11455
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   583
  // Notify the region that concurrent marking is starting. Initialize
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   584
  // all fields related to the next marking info.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   585
  inline void note_start_of_marking();
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   586
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   587
  // Notify the region that concurrent marking has finished. Copy the
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   588
  // (now finalized) next marking info fields into the prev marking
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   589
  // info fields.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   590
  inline void note_end_of_marking();
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   591
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   592
  // Notify the region that it will be used as to-space during a GC
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   593
  // and we are about to start copying objects into it.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   594
  inline void note_start_of_copying(bool during_initial_mark);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   595
11455
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   596
  // Notify the region that it ceases being to-space during a GC and
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   597
  // we will not copy objects into it any more.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   598
  inline void note_end_of_copying(bool during_initial_mark);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   599
11455
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   600
  // Notify the region that we are about to start processing
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   601
  // self-forwarded objects during evac failure handling.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   602
  void note_self_forwarding_removal_start(bool during_initial_mark,
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   603
                                          bool during_conc_mark);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   604
11455
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   605
  // Notify the region that we have finished processing self-forwarded
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   606
  // objects during evac failure handling.
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   607
  void note_self_forwarding_removal_end(bool during_initial_mark,
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   608
                                        bool during_conc_mark,
a6ab3d8b9a4c 6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents: 11451
diff changeset
   609
                                        size_t marked_bytes);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   610
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   611
  // Returns "false" iff no object in the region was allocated when the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   612
  // last mark phase ended.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   613
  bool is_marked() { return _prev_top_at_mark_start != bottom(); }
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
  void reset_during_compaction() {
13336
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   616
    assert(isHumongous() && startsHumongous(),
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   617
           "should only be called for starts humongous regions");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   618
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   619
    zero_marked_bytes();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   620
    init_top_at_mark_start();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   621
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   622
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   623
  void calc_gc_efficiency(void);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   624
  double gc_efficiency() { return _gc_efficiency;}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   625
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   626
  bool is_young() const     { return _young_type != NotYoung; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   627
  bool is_survivor() const  { return _young_type == Survivor; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   628
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   629
  int  young_index_in_cset() const { return _young_index_in_cset; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   630
  void set_young_index_in_cset(int index) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   631
    assert( (index == -1) || is_young(), "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   632
    _young_index_in_cset = index;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   633
  }
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
  int age_in_surv_rate_group() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   636
    assert( _surv_rate_group != NULL, "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   637
    assert( _age_index > -1, "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   638
    return _surv_rate_group->age_in_group(_age_index);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   639
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   640
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   641
  void record_surv_words_in_group(size_t words_survived) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   642
    assert( _surv_rate_group != NULL, "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   643
    assert( _age_index > -1, "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   644
    int age_in_group = age_in_surv_rate_group();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   645
    _surv_rate_group->record_surviving_words(age_in_group, words_survived);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   646
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   647
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   648
  int age_in_surv_rate_group_cond() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   649
    if (_surv_rate_group != NULL)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   650
      return age_in_surv_rate_group();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   651
    else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   652
      return -1;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   653
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   654
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   655
  SurvRateGroup* surv_rate_group() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   656
    return _surv_rate_group;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   657
  }
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
  void install_surv_rate_group(SurvRateGroup* surv_rate_group) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   660
    assert( surv_rate_group != NULL, "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   661
    assert( _surv_rate_group == NULL, "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   662
    assert( is_young(), "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   663
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   664
    _surv_rate_group = surv_rate_group;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   665
    _age_index = surv_rate_group->next_age_index();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   666
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   667
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   668
  void uninstall_surv_rate_group() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   669
    if (_surv_rate_group != NULL) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   670
      assert( _age_index > -1, "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   671
      assert( is_young(), "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   672
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   673
      _surv_rate_group = NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   674
      _age_index = -1;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   675
    } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   676
      assert( _age_index == -1, "pre-condition" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   677
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   678
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   679
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   680
  void set_young() { set_young_type(Young); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   681
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   682
  void set_survivor() { set_young_type(Survivor); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   683
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   684
  void set_not_young() { set_young_type(NotYoung); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   685
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   686
  // Determine if an object has been allocated since the last
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   687
  // mark performed by the collector. This returns true iff the object
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   688
  // is within the unmarked area of the region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   689
  bool obj_allocated_since_prev_marking(oop obj) const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   690
    return (HeapWord *) obj >= prev_top_at_mark_start();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   691
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   692
  bool obj_allocated_since_next_marking(oop obj) const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   693
    return (HeapWord *) obj >= next_top_at_mark_start();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   694
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   695
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   696
  // For parallel heapRegion traversal.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   697
  bool claimHeapRegion(int claimValue);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   698
  jint claim_value() { return _claimed; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   699
  // Use this carefully: only when you're sure no one is claiming...
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   700
  void set_claim_value(int claimValue) { _claimed = claimValue; }
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
  // Returns the "evacuation_failed" property of the region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   703
  bool evacuation_failed() { return _evacuation_failed; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   704
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   705
  // Sets the "evacuation_failed" property of the region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   706
  void set_evacuation_failed(bool b) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   707
    _evacuation_failed = b;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   708
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   709
    if (b) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   710
      _next_marked_bytes = 0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   711
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   712
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   713
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   714
  // Requires that "mr" be entirely within the region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   715
  // Apply "cl->do_object" to all objects that intersect with "mr".
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   716
  // If the iteration encounters an unparseable portion of the region,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   717
  // or if "cl->abort()" is true after a closure application,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   718
  // terminate the iteration and return the address of the start of the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   719
  // subregion that isn't done.  (The two can be distinguished by querying
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   720
  // "cl->abort()".)  Return of "NULL" indicates that the iteration
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   721
  // completed.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   722
  HeapWord*
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   723
  object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   724
9418
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8930
diff changeset
   725
  // filter_young: if true and the region is a young region then we
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8930
diff changeset
   726
  // skip the iteration.
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8930
diff changeset
   727
  // card_ptr: if not NULL, and we decide that the card is not young
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8930
diff changeset
   728
  // and we iterate over it, we'll clean the card before we start the
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8930
diff changeset
   729
  // iteration.
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   730
  HeapWord*
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   731
  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
   732
                                   FilterOutOfRegionClosure* cl,
9418
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8930
diff changeset
   733
                                   bool filter_young,
32a87dd6b746 7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents: 8930
diff changeset
   734
                                   jbyte* card_ptr);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   735
5350
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   736
  size_t recorded_rs_length() const        { return _recorded_rs_length; }
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   737
  double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; }
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   738
  size_t predicted_bytes_to_copy() const   { return _predicted_bytes_to_copy; }
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   739
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   740
  void set_recorded_rs_length(size_t rs_length) {
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   741
    _recorded_rs_length = rs_length;
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   742
  }
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   743
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   744
  void set_predicted_elapsed_time_ms(double ms) {
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   745
    _predicted_elapsed_time_ms = ms;
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   746
  }
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   747
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   748
  void set_predicted_bytes_to_copy(size_t bytes) {
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   749
    _predicted_bytes_to_copy = bytes;
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   750
  }
cccf0925702e 6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents: 4024
diff changeset
   751
13336
e582172ff6ff 7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents: 12508
diff changeset
   752
  virtual CompactibleSpace* next_compaction_space() const;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   753
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   754
  virtual void reset_after_compaction();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   755
19339
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   756
  // Routines for managing a list of code roots (attached to the
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   757
  // this region's RSet) that point into this heap region.
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   758
  void add_strong_code_root(nmethod* nm);
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   759
  void remove_strong_code_root(nmethod* nm);
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   760
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   761
  // During a collection, migrate the successfully evacuated
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   762
  // strong code roots that referenced into this region to the
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   763
  // new regions that they now point into. Unsuccessfully
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   764
  // evacuated code roots are not migrated.
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   765
  void migrate_strong_code_roots();
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   766
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   767
  // Applies blk->do_code_blob() to each of the entries in
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   768
  // the strong code roots list for this region
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   769
  void strong_code_roots_do(CodeBlobClosure* blk) const;
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   770
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   771
  // Verify that the entries on the strong code root list for this
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   772
  // region are live and include at least one pointer into this region.
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   773
  void verify_strong_code_roots(VerifyOption vo, bool* failures) const;
d247781beec7 7145569: G1: optimize nmethods scanning
johnc
parents: 15482
diff changeset
   774
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   775
  void print() const;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   776
  void print_on(outputStream* st) const;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   777
9995
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   778
  // vo == UsePrevMarking  -> use "prev" marking information,
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   779
  // vo == UseNextMarking -> use "next" marking information
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   780
  // vo == UseMarkWord    -> use the mark word in the object header
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   781
  //
3000
bbce6052b595 6850846: G1: extend G1 marking verification
tonyp
parents: 2883
diff changeset
   782
  // NOTE: Only the "prev" marking information is guaranteed to be
bbce6052b595 6850846: G1: extend G1 marking verification
tonyp
parents: 2883
diff changeset
   783
  // consistent most of the time, so most calls to this should use
9995
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   784
  // vo == UsePrevMarking.
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   785
  // Currently, there is only one case where this is called with
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   786
  // vo == UseNextMarking, which is to verify the "next" marking
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   787
  // information at the end of remark.
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   788
  // Currently there is only one place where this is called with
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   789
  // vo == UseMarkWord, which is to verify the marking during a
290620c08233 7004681: G1: Extend marking verification to Full GCs
johnc
parents: 9989
diff changeset
   790
  // full GC.
12379
2cf45b79ce3a 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 12272
diff changeset
   791
  void verify(VerifyOption vo, bool *failures) const;
3000
bbce6052b595 6850846: G1: extend G1 marking verification
tonyp
parents: 2883
diff changeset
   792
bbce6052b595 6850846: G1: extend G1 marking verification
tonyp
parents: 2883
diff changeset
   793
  // Override; it uses the "prev" marking information
12379
2cf45b79ce3a 4988100: oop_verify_old_oop appears to be dead
brutisso
parents: 12272
diff changeset
   794
  virtual void verify() const;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   795
};
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   796
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   797
// HeapRegionClosure is used for iterating over regions.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   798
// Terminates the iteration when the "doHeapRegion" method returns "true".
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   799
class HeapRegionClosure : public StackObj {
26316
93f6b40c038b 8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents: 26157
diff changeset
   800
  friend class HeapRegionManager;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   801
  friend class G1CollectedHeap;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   802
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   803
  bool _complete;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   804
  void incomplete() { _complete = false; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   805
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   806
 public:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   807
  HeapRegionClosure(): _complete(true) {}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   808
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   809
  // Typically called on each region until it returns true.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   810
  virtual bool doHeapRegion(HeapRegion* r) = 0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   811
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   812
  // True after iteration if the closure was applied to all heap regions
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   813
  // and returned "false" in all cases.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   814
  bool complete() { return _complete; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   815
};
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   816
15482
470d0b0c09f1 8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents: 13756
diff changeset
   817
#endif // INCLUDE_ALL_GCS
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
   818
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 6983
diff changeset
   819
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP