jdk8-mips64-public/hotspot: src/share/vm/memory/blockOffsetTable.inline.hpp@7b0e9cba0307

6896647: card marks can be deferred too long
Summary: Deferred card marks are now flushed during the gc prologue. Parallel[Scavege,OldGC] and SerialGC no longer defer card marks generated by COMPILER2 as a result of ReduceInitialCardMarks. For these cases, introduced a diagnostic option to defer the card marks, only for the purposes of testing and diagnostics. CMS and G1 continue to defer card marks. Potential performance concern related to single-threaded flushing of deferred card marks in the gc prologue will be addressed in the future.
Reviewed-by: never, johnc

     1 /*

     2  * Copyright 2000-2002 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 //////////////////////////////////////////////////////////////////////////

    26 // BlockOffsetTable inlines

    27 //////////////////////////////////////////////////////////////////////////

    28 inline HeapWord* BlockOffsetTable::block_start(const void* addr) const {

    29   if (addr >= _bottom && addr < _end) {

    30     return block_start_unsafe(addr);

    31   } else {

    32     return NULL;

    33   }

    34 }

    36 //////////////////////////////////////////////////////////////////////////

    37 // BlockOffsetSharedArray inlines

    38 //////////////////////////////////////////////////////////////////////////

    39 inline size_t BlockOffsetSharedArray::index_for(const void* p) const {

    40   char* pc = (char*)p;

    41   assert(pc >= (char*)_reserved.start() &&

    42          pc <  (char*)_reserved.end(),

    43          "p not in range.");

    44   size_t delta = pointer_delta(pc, _reserved.start(), sizeof(char));

    45   size_t result = delta >> LogN;

    46   assert(result < _vs.committed_size(), "bad index from address");

    47   return result;

    48 }

    50 inline HeapWord* BlockOffsetSharedArray::address_for_index(size_t index) const {

    51   assert(index < _vs.committed_size(), "bad index");

    52   HeapWord* result = _reserved.start() + (index << LogN_words);

    53   assert(result >= _reserved.start() && result < _reserved.end(),

    54          "bad address from index");

    55   return result;

    56 }

    59 //////////////////////////////////////////////////////////////////////////

    60 // BlockOffsetArrayNonContigSpace inlines

    61 //////////////////////////////////////////////////////////////////////////

    62 inline void BlockOffsetArrayNonContigSpace::freed(HeapWord* blk_start,

    63                                                   HeapWord* blk_end) {

    64   // Verify that the BOT shows [blk_start, blk_end) to be one block.

    65   verify_single_block(blk_start, blk_end);

    66   // adjust _unallocated_block upward or downward

    67   // as appropriate

    68   if (BlockOffsetArrayUseUnallocatedBlock) {

    69     assert(_unallocated_block <= _end,

    70            "Inconsistent value for _unallocated_block");

    71     if (blk_end >= _unallocated_block && blk_start <= _unallocated_block) {

    72       // CMS-specific note: a block abutting _unallocated_block to

    73       // its left is being freed, a new block is being added or

    74       // we are resetting following a compaction

    75       _unallocated_block = blk_start;

    76     }

    77   }

    78 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/memory/blockOffsetTable.inline.hpp@7b0e9cba0307

src/share/vm/memory/blockOffsetTable.inline.hpp