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src/hotspot/share/gc/parallel/parallelArguments.cpp

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  9  *
 10  * This code is distributed in the hope that it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 13  * version 2 for more details (a copy is included in the LICENSE file that
 14  * accompanied this code).
 15  *
 16  * You should have received a copy of the GNU General Public License version
 17  * 2 along with this work; if not, write to the Free Software Foundation,
 18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 19  *
 20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 21  * or visit www.oracle.com if you need additional information or have any
 22  * questions.
 23  *
 24  */
 25 
 26 #include "gc/parallel/parallelArguments.hpp"
 27 #include "gc/parallel/parallelScavengeHeap.hpp"
 28 #include "gc/shared/adaptiveSizePolicy.hpp"
 29 #include "gc/shared/fullGCForwarding.hpp"
 30 #include "gc/shared/gcArguments.hpp"
 31 #include "gc/shared/genArguments.hpp"
 32 #include "gc/shared/workerPolicy.hpp"
 33 #include "logging/log.hpp"
 34 #include "runtime/globals.hpp"
 35 #include "runtime/globals_extension.hpp"
 36 #include "runtime/java.hpp"
 37 #include "utilities/defaultStream.hpp"
 38 #include "utilities/powerOfTwo.hpp"
 39 
 40 size_t ParallelArguments::conservative_max_heap_alignment() {
 41   return compute_heap_alignment();
 42 }
 43 
 44 void ParallelArguments::initialize() {
 45   GCArguments::initialize();
 46   assert(UseParallelGC, "Error");
 47 
 48   // If no heap maximum was requested explicitly, use some reasonable fraction
 49   // of the physical memory, up to a maximum of 1GB.

 65       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
 66     }
 67   }
 68 
 69   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
 70   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
 71   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
 72   // See CR 6362902 for details.
 73   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
 74     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
 75        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
 76     }
 77     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
 78       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
 79     }
 80   }
 81 
 82   if (FLAG_IS_DEFAULT(ParallelRefProcEnabled) && ParallelGCThreads > 1) {
 83     FLAG_SET_DEFAULT(ParallelRefProcEnabled, true);
 84   }
 85 
 86   FullGCForwarding::initialize_flags(heap_reserved_size_bytes());
 87 }
 88 
 89 // The alignment used for boundary between young gen and old gen
 90 static size_t default_gen_alignment() {
 91   return 64 * K * HeapWordSize;
 92 }
 93 
 94 void ParallelArguments::initialize_alignments() {
 95   // Initialize card size before initializing alignments
 96   CardTable::initialize_card_size();
 97   SpaceAlignment = GenAlignment = default_gen_alignment();
 98   HeapAlignment = compute_heap_alignment();
 99 }
100 
101 void ParallelArguments::initialize_heap_flags_and_sizes_one_pass() {
102   // Do basic sizing work
103   GenArguments::initialize_heap_flags_and_sizes();
104 
105   // The survivor ratio's are calculated "raw", unlike the
106   // default gc, which adds 2 to the ratio value. We need to

  9  *
 10  * This code is distributed in the hope that it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 13  * version 2 for more details (a copy is included in the LICENSE file that
 14  * accompanied this code).
 15  *
 16  * You should have received a copy of the GNU General Public License version
 17  * 2 along with this work; if not, write to the Free Software Foundation,
 18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 19  *
 20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 21  * or visit www.oracle.com if you need additional information or have any
 22  * questions.
 23  *
 24  */
 25 
 26 #include "gc/parallel/parallelArguments.hpp"
 27 #include "gc/parallel/parallelScavengeHeap.hpp"
 28 #include "gc/shared/adaptiveSizePolicy.hpp"

 29 #include "gc/shared/gcArguments.hpp"
 30 #include "gc/shared/genArguments.hpp"
 31 #include "gc/shared/workerPolicy.hpp"
 32 #include "logging/log.hpp"
 33 #include "runtime/globals.hpp"
 34 #include "runtime/globals_extension.hpp"
 35 #include "runtime/java.hpp"
 36 #include "utilities/defaultStream.hpp"
 37 #include "utilities/powerOfTwo.hpp"
 38 
 39 size_t ParallelArguments::conservative_max_heap_alignment() {
 40   return compute_heap_alignment();
 41 }
 42 
 43 void ParallelArguments::initialize() {
 44   GCArguments::initialize();
 45   assert(UseParallelGC, "Error");
 46 
 47   // If no heap maximum was requested explicitly, use some reasonable fraction
 48   // of the physical memory, up to a maximum of 1GB.

 64       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
 65     }
 66   }
 67 
 68   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
 69   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
 70   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
 71   // See CR 6362902 for details.
 72   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
 73     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
 74        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
 75     }
 76     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
 77       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
 78     }
 79   }
 80 
 81   if (FLAG_IS_DEFAULT(ParallelRefProcEnabled) && ParallelGCThreads > 1) {
 82     FLAG_SET_DEFAULT(ParallelRefProcEnabled, true);
 83   }


 84 }
 85 
 86 // The alignment used for boundary between young gen and old gen
 87 static size_t default_gen_alignment() {
 88   return 64 * K * HeapWordSize;
 89 }
 90 
 91 void ParallelArguments::initialize_alignments() {
 92   // Initialize card size before initializing alignments
 93   CardTable::initialize_card_size();
 94   SpaceAlignment = GenAlignment = default_gen_alignment();
 95   HeapAlignment = compute_heap_alignment();
 96 }
 97 
 98 void ParallelArguments::initialize_heap_flags_and_sizes_one_pass() {
 99   // Do basic sizing work
100   GenArguments::initialize_heap_flags_and_sizes();
101 
102   // The survivor ratio's are calculated "raw", unlike the
103   // default gc, which adds 2 to the ratio value. We need to
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