jdk8-mips64-public/hotspot: src/share/vm/memory/generation.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 2000-2006 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 bool OneContigSpaceCardGeneration::is_in(const void* p) const {

    26   return the_space()->is_in(p);

    27 }

    30 WaterMark OneContigSpaceCardGeneration::top_mark() {

    31   return the_space()->top_mark();

    32 }

    34 CompactibleSpace*

    35 OneContigSpaceCardGeneration::first_compaction_space() const {

    36   return the_space();

    37 }

    39 HeapWord* OneContigSpaceCardGeneration::allocate(size_t word_size,

    40                                                  bool is_tlab) {

    41   assert(!is_tlab, "OneContigSpaceCardGeneration does not support TLAB allocation");

    42   return the_space()->allocate(word_size);

    43 }

    45 HeapWord* OneContigSpaceCardGeneration::par_allocate(size_t word_size,

    46                                                      bool is_tlab) {

    47   assert(!is_tlab, "OneContigSpaceCardGeneration does not support TLAB allocation");

    48   return the_space()->par_allocate(word_size);

    49 }

    51 WaterMark OneContigSpaceCardGeneration::bottom_mark() {

    52   return the_space()->bottom_mark();

    53 }

    55 size_t OneContigSpaceCardGeneration::block_size(const HeapWord* addr) const {

    56   if (addr < the_space()->top()) return oop(addr)->size();

    57   else {

    58     assert(addr == the_space()->top(), "non-block head arg to block_size");

    59     return the_space()->_end - the_space()->top();

    60   }

    61 }

    63 bool OneContigSpaceCardGeneration::block_is_obj(const HeapWord* addr) const {

    64   return addr < the_space()->top();

    65 }

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

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

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