jdk8-mips64-public/hotspot: src/share/vm/memory/barrierSet.cpp@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 1997-2006 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 # include "incls/_precompiled.incl"

    26 # include "incls/_barrierSet.cpp.incl"

    28 // count is number of array elements being written

    29 void BarrierSet::static_write_ref_array_pre(HeapWord* start, size_t count) {

    30   assert(count <= (size_t)max_intx, "count too large");

    31 #if 0

    32   warning("Pre: \t" INTPTR_FORMAT "[" SIZE_FORMAT "]\t",

    33                    start,            count);

    34 #endif

    35   if (UseCompressedOops) {

    36     Universe::heap()->barrier_set()->write_ref_array_pre((narrowOop*)start, (int)count);

    37   } else {

    38     Universe::heap()->barrier_set()->write_ref_array_pre(      (oop*)start, (int)count);

    39   }

    40 }

    42 // count is number of array elements being written

    43 void BarrierSet::static_write_ref_array_post(HeapWord* start, size_t count) {

    44   // simply delegate to instance method

    45   Universe::heap()->barrier_set()->write_ref_array(start, count);

    46 }

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

src/share/vm/memory/barrierSet.cpp@7b0e9cba0307

src/share/vm/memory/barrierSet.cpp